EP0097865A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
A vacuum suspended brake servo device
Assignee: Nissan Motor Co Ltd
•
Filing: 1983-06-13
•
Granted: —
•
Expires: 2003-06-13
Abstract
Abstract In a vacuum suspended type servo device, there is arranged a power ratio adjusting means for adjusting the power multiplying characteristic of the servo device to a desired degree. The power ratio adjusting means comprises a reaction lever (76) having a bent portion which is pivotally seated on the lower piston (20) to act as a fulcrum of the reaction lever, a plunger member (32) movable with an input member to which an input force is applied when a brake pedal is depressed, the plunger member having a shoulder portion (32c) to which one end of the reaction lever is engaged when the reaction lever pivots to a certain degree, a support member (56) fixed to an output member (44) connected to the master cylinder piston, a reaction member (58, 60, 62) movably supported by the support member, the reaction member having a projection (60a) which is in contact at its top end with the reaction lever, and an electrically actuated moving means (64, 66, 68, 70) for moving the reaction member so that the projection of the reaction member is movable along the axis of the reaction lever between the end of the lever and the bent portion of the lever.
Inventors
- 👤 Osamu Horibe
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 17:04
CPC Classifications
B; B60; B60T; B60T13/00; B60T13/10; B60T13/24; B60T13/241; B60T13/46; B60T13/52; B60T13/573; B60T13/577
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
181 words
A vacuum suspended type servo device comprising: a housing (12); a power piston (20) movable with a diaphragm (16) which is disposed in said housing to divide the interior of same into first and second chambers (A, B), said first chamber being communicated with a vacuum source, said second chamber being communicable with the atmosphere; an input member (40) to which an input force is applied; an output member (44) to which the movement of said power piston is transmitted under a certain condition; a valve means (28, 32b) for providing a communication between said second chamber and the atmosphere when said input member moves beyond a certain degree in response to application of the input force thereto; and a power multiplying device (76, 56, 58, 60, 64, 66) interposed between said power piston and said output member to multiply the power which is applied to said output member from said power piston, wherein said power multiplying device includes a power ratio adjusting means by which the power multiplying ratio of said power multiplying device is adjustable to a desired value.
Claim 2
Dependent Claim
181 words
A vacuum suspended type servo device comprising: a housing (12); a power piston (20) movable with a diaphragm (16) which is disposed in said housing to divide the interior of same into first and second chambers (A, B), said first chamber being communicated with a vacuum source, said second chamber being communicable with the atmosphere; an input member (40) to which an input force is applied; an output member (44) to which the movement of said power piston is transmitted under a certain condition; a valve means (28, 32b) for providing a communication between said second chamber and the atmosphere when said input member moves beyond a certain degree in response to application of the input force thereto; and a power multiplying device (76, 56, 58, 60, 64, 66) interposed between said power piston and said output member to multiply the power which is applied to said output member from said power piston, wherein said power multiplying device includes a power ratio adjusting means by which the power multiplying ratio of said power multiplying device is adjustable to a desired value.
Claim 3
Dependent Claim
160 words
A vacuum suspended type servo device as claimed in Claim 1, in which said power multiplying device comprises: a reaction lever (76) having a bent portion which is pivotally seated on said power piston to act as a fulcrum of said reaction lever; a plunger member (32) movable with said input member, said plunger member having a shoulder portion (32c) to which one end of said reaction lever is engaged when said reaction lever pivots to a certain degree; a support member (56) fixed to said output member to move therewith; a reaction member (58, 60, 62) movably supported by said support member, said reaction member having a projection which is in contact with said reaction lever; and moving means (64, 66, 68, 70) for moving the reaction member so that the projection of said reaction member is movable along the axis of said reaction lever between said one end of the lever and the bent portion of the lever.
Claim 4
Dependent Claim
62 words
A vacuum suspended type servo device as claimed in Claim 2, in which said moving means comprises: a solenoid (64) supported by said support member; a plunger (66) movable in response to energization and de-energization of said solenoid; and connecting means (68, 70) connecting said plunger with said reaction member thereby to transmit the movement of said plunger to said reaction member.
Claim 5
Dependent Claim
63 words
A vacuum suspended type servo device as claimed in Claim 3, in which said reaction member comprises an annular plate (58) which is slidably mounted on said support member and rotatable about the axis of said output member, and a rectangular projection (60a) extending at right angles from said annular plate to be in contact at its top end with said reaction lever.
Claim 6
Dependent Claim
65 words
A vacuum suspended type servo device as claimed in Claim 4, in which said reaction lever is equipped with an elongate roller (78) which lies along the axis of said reaction lever and is rotatable about the axis thereof relative to said reaction lever, said top end of said rectangular projection of said reaction member being in contact with the cylindrical portion of said roller.
Claim 7
Dependent Claim
32 words
A vacuum suspended type servo device as claimed in Claim 5, in which said top end of said rectangular projection is gradually reduced in thickness thereby to form a knife-edge shape (62a).
Claim 8
Dependent Claim
37 words
A vacuum suspended type servo device as claimed in Claim 6, in which said rectangular projection is oriented so that the axis of it deviates by a certain angle from the radial direction of said annular plate.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.