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1. WO1987003850 - ACTUATEUR DE PISTONS ET CYLINDRES DU TYPE A TRACTION

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

Claims
1. A master cylinder actuator, comprising:
A) a first housing member having a cylindrical bore;
B) a second housing member having a cylindrical bore telescopically receiving said first housing member in an assembled position to cooperate therewith to form a fluid pressure chamber;
C) means for connecting the first housing member to the second housing member in said assembled position;
D) a piston disposed in said fluid pressure chamber for reciprocal, slidable motion;
E) one of said housing members having a piston rod opening;
F) a piston rod connected to the piston so as to be movable therewith, the piston rod being receivable in said piston rod opening so as to project exteriorly of said pressure chamber; and
G) at least one of said housing members having port means for passing a fluid, said port means being in fluid communication with said pressure chamber on at least one side of the piston such that the piston is operative to pass fluid through said port means as the piston is being moved in said pressure chamber.

2. A master cylinder actuator as defined in claim 1 in which the fluid is a hydraulic fluid.

3. A master cylinder actuator as defined in claim 1 in which the piston rod is adapted to be pulled in a power stroke in a first direction with respect to the pressure chamber and including bias means disposed

•5 in the pressure chamber for moving the piston in the opposite direction.

4. A master cylinder actuator as defined in claim 3 in which the port means are adapted to pass fluid from the pressure chamber as the piston is being moved in said first direction.

5. A master cylinder actuator as defined in claim 1 in which the port means includes an inlet port for receiving fluid into said pressure chamber and an outlet port for removal of said fluid from the pressure

5 chamber .

6. A master cyl inder actuator as def ined in claim 1 in which the connecting means includes annular first threaded means on one of said housing members and complementary annular second threaded means carried on the other of said housing members engagable with the first threaded means.

7. A master cylinder actuator as defined in claim 6 in which the fluid pressure chamber is elongated and in which one of the housing members has an annular groove and including a snap ring receivable in the groove and the other of said housing members has an abutment engagable with the snap ring to define the overall length of the fluid pressure chamber at such times as the first threaded means are engaged with the second threaded means.

8. A master cylinder actuator as defined in claim 1 in which the first housing member has a first port for receiving fluid into the fluid pressure chamber and the second housing member has a second port for removal of fluid from the fluid pressure chamber .

9. A master cylinder actuator as defined in claim 1 in which the first housing member has a second fluid chamber forming a reservoir for fluid that is to be passed into said fluid pressure chamber and one of said housing members has a port providing fluid communication between the second fluid chamber and the fluid pressure chamber, said port being disposed such that as the piston is moved toward a first position, the piston closes fluid communication between the second 1° fluid chamber and the pressure chamber, and as the piston is moved toward a second position, fluid communication is opened between the second fluid chamber and the fluid pressure chamber.

10. A fluid reservoir means for hydraulic control apparatus comprising:
a body having an internal chamber and means defining an opening into said chamber;
55 a cap having a vent opening mounted on the body opening;
said cap being removable from the body for passing a hydraulic fluid through the body opening into said internal chamber; and
10. a flexible diaphragm disposed in the internal chamber of the body to divide same into a pair of non- communicating chambers including an air chamber on one side of the diaphragm adjacent the cap, and vented to atmosphere through the cap vent opening, and a fluid

15: chamber on the opposite side of the diaphragm for containing hydraulic fluid;

said diaphragm having an annular wall defining an opening ano said cap having an annular wall defining an opening, one of said annular walls being

•20 telescopically received in the other of said walls and including first interengaging means on one of said walls and second interengaging means on the other of said walls for engaging the first interengaging means such that as said cap is removed from said body opening, said

•25 diaphragm is removed with said cap.

11. A reservoir means as defined in claim 10 in which said first interengaging means comprises an annular groove and said second interengaging means comprises an annular shoulder receivable in said annular

5 groove whereby said cap and said diaphragm are removable as a unit from said body to pass hydraulic fluid into said internal chamber.

12. A reservoir means as defined in claim 11 in which said cap annular wall is received in both said body opening and in said diaphragm annular wall opening.

13. A reservoir means as defined in claim 10 in which said cap has an annular lip disposed adjacent said means defining said body opening, and said diaphragm has a l ip disposed between said means defining said body opening and said cap l ip, and wherein said reser voir further incl udes means for clamping said diaphragm l ip between said cap l ip and said body to form a seal between said diaphragm and said body at such time as said cap is mounted on said body.

14. A reser voir means as def ined in c l aim 13 in which said clamping means comprises an annular ring having threaded means, and said body has cooperating threaded means engagable with said threaded means on said annular ring.

15. A reser voir means as defined in cl aim 10 in which said diaphragm is bel lows-shaped and formed of an elastomer ic material.

16. A master cylinder actuator comprising :
a first housing member having a cylindrical bore and means defining a first opening ;
a second housing member having a cylindrical bore telescopical ly receiving said first housing member in an assembled position to cooperate with the f irs t housing member to form a fluid pressure cnamber;

means for connecting the first housing member to the second housing member in said assembled position,

10. the connecting means including annular first threaded means on one of said housing members and complementary second annular threaded means carried on the other of said housing member engagable with the first threaded means;
~~~ a piston disposed in said fluid pressure chamber for reciprocal, slidable motion;
one of said housing members having a piston rod opening;
a piston rod connected to the piston so as to

20 be movable therewith, the piston rod being receivable in said piston rod opening such that a portion of the piston rod is disposed outside the fluid pressure chamber;
the piston rod being adapted to be pulled with

25 the piston in a power stroke in a first direction with respect to the pressure chamber and including bias means disposed in the pressure chamber for moving the piston rod in the opposite direction;
at least one of said housing members having

~& port means for passing a fluid, said port means being in fluid communication with said pressure chamber on at least one side of the piston such that the piston is operative to urge the hydraulic fluid through said port means as the piston is being moved in a power stroke;
the first housing member having an annular groove and including a snap ring receivable in the groove the second housing member having an abutment engagable with the snap ring to define the first position of the first housing member with respect to the second housing member at such times as they are connected together;
the second housing member having an integral, second fluid chamber forming a reservoir for fluid that is to be passed into the fluid pressure chamber and including a second port means in the second housing member providing fluid communication between the second fluid chamber and the fluid pressure chamber, the second port means being disposed such that as the piston is moved toward a first position, the piston closes fluid communication between the second fluid chamber and the fluid pressure chamber and as the piston is moved toward a second position, the piston opens fluid communication between the second fluid chamber and the fluid pressure chamber;
the second housing member having means defining a fluid-filling opening for receiving hydraulic fluid into the second fluid chamber;

a cap having a vent opening mounted on the fluid-filling opening;
60 the cap being removable from the second housing member for passing a hydraulic fluid into said reservoir;
a flexible bellows of an elastomeric material disposed in the reservoir to divide same into a pair of

6-5 non-communicating chambers including an air chamber on one side of the bellows adjacent the cap, the air chamber being vented to atmosphere through the cap vent opening, and a fluid chamber on the opposite side of the bellows for containing hydraulic fluid; and
T- the bellows having an annular wall and the cap having an annular wall, one of said annular walls being telescopically received in the other of said annular walls and including first interengaging means on one of said annular walls for engaging the first interengagable

75 means such that as the cap is removed from the body opening, the bellows is removed with the cap.

17. In a master cylinder actuator, the combination comprising:
a first housing member having a cylindrical bore;
5 a second housing member having a cylindrical bore telescopically receiving said first housing member in a position to cooperate therewith to form a fluid pressure chamber;
an internal liner disposed in the fluid pressure chamber adjacent the first and second housing members;
a piston disposed in the fluid pressure chamber so as to be slidably, reciprocally mounted in the liner to divide the fluid pressure chamber into a low pressure chamber on one side of the piston and a low pressure chamber on the opposite side of the piston; and
an O-ring disposed between the liner and in abutment with the liner, the first housing member, and the second housing member to form a seal therebetween so as to prevent fluid communication between the liner and the first and the second housing members, and between the first and second housing members and the atmosphere.

18. A master cylinder actuator as defined in claim 1 further including:
an internal liner disposed in said fluid pressure chamber adjacent said first and second housing members;
said piston being slidably, reciprocally mounted in said liner to divide the fluid pressure chamber into a lower pressure chamber on one side of the piston and the high pressure chamber on the opposite

10 side of the piston; and
an O-ring disposed between the liner and in abutment with the liner, the first housing member, and the second housing member to form a seal therebetween so as to prevent fluid communication between the liner and

-~~ the first and second housing members and between the first and second housing members and the atmosphere.

19. The master cylinder actuator as defined in claim 9 wherein said first housing member has an opening into said second fluid chamber reservoir for introducing hydraulic fluid therein, and further

5 including:
a removable cap having a vent opening mounted on the body opening;
a flexible diaphragm disposed in the second fluid chamber to divide the same into a pair of non-IQ communicating chambers including an air chamber on one side of the diaphragm adjacent the cap, and vented to atmosphere through the cap vent opening, and a fluid chamber on the opposite side of the diaphragm for containing the hydraulic fluid; and 5- means on the cap so connected to the diaphragm that it is removable with the cap at such times as the cap is moved from the body to introduce fluid into the internal chamber.

20.. A master cylinder actuator as defined in claim 1 wherein:
H) said actuator further includes coacting means on said first and second housing members operative ~ in response to telescoping insertion of one of said housing members into the other of said housing members to snappingly secure said first housing member to said second housing member in said assembled position.

21. A master cylinder actuator according to claim 20 wherein:
I) said housing members are formed of a resilient material; and
J) said coacting means comprises an external circumferentially extending connector lip on one of said housing members snappingly coacting with an internal circumferentially extending connector lip on the other of said housing members.

22. A master cylinder actuator according to claim 21 wherein:
K) said first housing member includes an open end and a closed end defining said piston rod opening; ■5" ) said second housing member includes an open end and a closed end;
M) said first member is telescopically received within said second member ;
N) said external circumferential ly extending 10 connector lip is provided on said first housing member; and
0) said internal circumferential ly extending connector lip is provided on said second housing member.

23. A master cylinder actuator according to claim 22 wherein:
P) the open end of said second member is positioned proximate the closed end of said first 5 member;
Q) said external lip is provided on said first housing member proximate the closed end thereof; and
R) said internal lip is provided on said second housing member proximate the open end thereof.

24. A master cylinder actuator according to claim 1 wherein:
H) said first housing member includes an open end and a closed end defining said piston rod opening;

5 I) said second housing member includes an open end and a closed end;
J) said first housing member is telescopically received within said second housing member ;
10 K) said first housing member includes a locator portion projecting outwardly therefrom; and
L) said second housing member includes a locator slot extending axially from said open end thereof and sized to slidably receive said locator

•15 portion of said first housing member in response to telescoping insertion of said first housing member into said housing member so as to angularly locate said second housing member on said first housing member.

25. A master cylinder actuator according to claim 24 wherein:
M) said locator portion of said first housing member comprises an integral fitting extending outwardly

5 from said first housing member proximate said closed end thereof in surrounding relation to said port means; and N) said locator slot is sized to slidably receive said fitting.

26. A master cylinder actuator according to claim 25 wherein:
0) said second housing member further includes a hollow upstanding reservoir portion communicating at its lower end with said second housing member bore;
P) said port means and said fitting are located at the underside of said first housing member; and
° Q) said locator slot is located at the underside of said second housing member so as to angularly locate said second member on said first member with said reservoir portion of said second member in generally upstanding disposition in response to 5 telescoping insertion of said first housign member into said second housing member.

27. A master cylinder actuator assembly comprising:
A) a first housing member including a hollow cylindrical main body portion centered on an axis and including an open end and a closed end;

B) a second housing member including a hollow cylindrical main body portion centered on said axis and including an open end and a hollow upstanding reservoir portion communicating at its lower end with said main body portion, said main body portions of said first and second housing members being telescopically related and defining an elongated pressure chamber within said housings centered on said axis;
C) a piston slidably mounted in said pressure chamber for reciprocal movement along said axis between a rest position and an actuated position and dividing said chamber into a high pressure portion between one side of said piston and said first member closed end and a low pressure portion on the other side of said piston;
D) a piston rod secured to said one side of said piston and projecting through said closed end of said main body portion of said first member;
E) discharge port means communicating with said high pressure portion of said pressure chamber; and F) replenishing port means providing fluid communication between the interior of said reservoir portion of said second housing member and said pressure chamber with said piston in its rest position.

28. A master cylinder actuator assembly according to claim 27 wherein:
G) said main body portion of said first housing member is telescopically received within said main body portion of said second housing member and totally defines said pressure chamber; and
H) coacting connector means are provided on said main body portion of said first member and on said main body portion of said second member which are operative in response to telescoping insertion of said first member into said main body portion of said second member to snappingly secure said members together in an assembled position.

29. A master cylinder actuator assembly according to claim 28 wherein:
I) said discharge port means extends through the cylindrical side wall of said main body portion of said first housing member;
J) said main body portion of said first member includes an integral fitting extending downwardly from said main body portion of said second member adjacent said closed end thereof in surrounding relation to said discharge port means; and K) said main body portion of said second housing member includes a locator slot extending axially from the open end thereof at the underside thereof and sized to slidably receive said fitting so as to IS angularly locate said second member on said first member with said reservoir portion of said second member in generally upstanding disposition in response to telescoping insertion of said first member into said second member.

30. A master cylinder actuator assembly according to claim 29 wherein:
L) said housing members are formed of a resilient material; and
5 M) said coacting connector means comprises an external annular connector lip on said main body portion of said first housing member snappingly coacting with an internal annular connector lip on said main body portion of said second housing member.

31. A master cylinder actuator assembly according to claim 30 wherein:
N) said assembled position of said housing members is defined by the snapping engagement of said

S internal annular lip over said external annular lip and by the bottoming of said fitting in the blind end of said locator slot.

32. A master cylinder actuator assembly according to claim 28 wherein:
I) said housing members are formed of a resilient material; and
■5 J) said coacting connector means comprises an external annular connector lip on said main body portion of said first housing member snappingly coacting with an internal annular connector lip on said main body portion of said second housing member.

33. A master cylinder actuator assembly according to claim 32 wherein:
K) said main body portion of said first housing member further includes an external annular 5 sealing lip spaced axially with respect to said external annular connector lip towards said open end thereof;
) said main body portion of said second housing member includes a radially enlarged collar at said open end thereof forming an internal annular

Id shoulder spaced axially inwardly from the free end of said collar;

M) said external connector lip is positioned at the free end of said collar; and
N) said actuator further includes an annular sealing ring positioned sealingly between said external annular sealing lip and said annular shoulder in the assembled position of said housing.

34. A master cylinder actuator according to claim 22 wherein:
P) said main body portion of said first housing member further includes an external annular sealing lip spaced axially with respect to said external connector lip towards said open end thereof;
Q) said main body portion of said second housing member includes a radially enlarged collar at said open end thereof forming an internal annular shoulder spaced axially inwardly from the free end of said collar;
R) said external connector lip is provided at the free end of said collar; and
S) said actuator further includes an annular sealing ring positioned sealingly between said external annular sealing lip and said annular shoulder in the assembled position of said housing.