WO1991005690A1 - A self-blocking, hydraulic brake booster - Google Patents

A self-blocking, hydraulic brake booster Download PDF

Info

Publication number
WO1991005690A1
WO1991005690A1 PCT/IT1990/000083 IT9000083W WO9105690A1 WO 1991005690 A1 WO1991005690 A1 WO 1991005690A1 IT 9000083 W IT9000083 W IT 9000083W WO 9105690 A1 WO9105690 A1 WO 9105690A1
Authority
WO
WIPO (PCT)
Prior art keywords
blocking
self
brake booster
small
pressure
Prior art date
Application number
PCT/IT1990/000083
Other languages
French (fr)
Inventor
Mario Gigli
Original Assignee
Mario Gigli
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mario Gigli filed Critical Mario Gigli
Publication of WO1991005690A1 publication Critical patent/WO1991005690A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
    • B60T8/40—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition comprising an additional fluid circuit including fluid pressurising means for modifying the pressure of the braking fluid, e.g. including wheel driven pumps for detecting a speed condition, or pumps which are controlled by means independent of the braking system
    • B60T8/4095—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition comprising an additional fluid circuit including fluid pressurising means for modifying the pressure of the braking fluid, e.g. including wheel driven pumps for detecting a speed condition, or pumps which are controlled by means independent of the braking system including wheel driven pumps for detecting a speed condition
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T1/00—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles
    • B60T1/02—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles acting by retarding wheels
    • B60T1/08—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles acting by retarding wheels using fluid or powdered medium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/12—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being liquid
    • B60T13/16—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being liquid using pumps directly, i.e. without interposition of accumulators or reservoirs
    • B60T13/18—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being liquid using pumps directly, i.e. without interposition of accumulators or reservoirs with control of pump output delivery, e.g. by distributor valves

Definitions

  • the present invention concerns a self-blocking, hydraulic brake booster for vehicles, of the kind using the original primary circuit, controlled by the driver, lowering the working pressure and avoiding the need of the traditional brake booster.
  • the device according to the present invention due to the use of the original primary circuit controlled by the dri ver, that lowers the working pressure avoiding the need o the conventional brake booster with a greater functioning safety so as to be considered a reserve system, exploits the inertia energy of the vehicle for operating a hydrodi na ic pumping mechanism with variable capacity and with high pressure on the friction surfaces connected to the r tation of the wheels, with the pressure discharge thereof at every slowing down or blocking.
  • Figures 1 and 2 show a square section of a self-blocking, hydraulic brake booster according to the present invention for the control of disk brakes.
  • Figures 3 and 4 show a square section of a variant of the self-blocking, hydraulic brake booster for the control of the jaws of drum brakes.
  • the figures show a self-blocking, hydraulic brake booster consisting of a cylinder comprised in the plier of a brake 2, or otherwise fixed on the vertical of the wheel's hub i which it may slide, sealed by small rubbers 3, the hollow piston 4 shown in dotted lines in figures 1 and 2, pushed to the end of its run by a spring 5 kept by cup 6 on ela ⁇ stic ring 6A.
  • a small piston 7 may slide, pushed by a spring 8 on the end-run metal ring guided by the cup 6 with the dust-cover bushing 6B.
  • the small lever 10 having its fulcrum in pin 11, has hing ed on friction pin 12 sliding-block 13 pushed by the pin- spring 14 in tappet contact with the half-spheric end of the small piston 7 against the alignment stop 12A.
  • a cam 15, out of one piece with the wheel's hub or to the one of the brake's disk 16, may freely rotate in axis with the sliding-block 13 without touching the same until the pressure of the primary circuit 16A - hydraulic or pneuma- tic - shown by P on the direction arrows and controlled by the pilot, acting on the piston 17 of reduced diameter due to a limited push on the friction surfaces so as to preven the blocking thereof, and acting through the tube 18 on th hollow piston 4 causing the movement thereof towards the cam 15, causes the contact of the sliding-block therewith and the consequent alternate motion of the small piston 7, called by the return spring 8 at the lower run-end deter ⁇ mined by the metal ring 9.
  • the sliding of the upper end of the small piston 7 in its cylinder 7A, fed through the groove canalization 19, anu- lar 20 and the small automatic valve 21, with the liquid of the tank 22, may pump at high pressure through the re ⁇ tention valve 23, hydraul ⁇ oil into the chamber of one piston 24, for the push on the friction surfaces having a greater diameter than the primary one 17, for the maximum braking effect desired or for an uncontrolled need of the pilot .
  • Ad adjustable nozzle 25, by means of a conical screw 25A having a fix and continuous capacity, adjusts the dischar ⁇ ge of the pressure onto the piston 24 and the consequent blocking of the brake for the stopping of the cam 15 and o pumping 7.
  • the primary pressure with its reduced braking effect con ⁇ nects the blocking and the release of the brake. Relating to the primary pressure, adjusted by the pilot, the spring 5 is compressed, the setting thereof determining the run o the small piston 7 and the capacity thereof relating to th rotation speed of the cam 15, for the self-adjusting brak ⁇ ing and anti-braking effect.
  • the primary pressure acting also on a small piston 26, sealing sliding on small rubbers 27 and 27A in its cylinder, over ⁇ coming the resistance of spring 28, determines by means of the adjusting of run-end 29 the discharge capacity of the secondary pressure, through the position of the anular light 26A, of the small piston 26 with respect to the one 26B to reservoir 22, which due to gravity keeps operative the whole pumping system.
  • a double small cy linder 30 with concentrical chambers, with small discharge valves 30A may transmit the primary pressure as well as the secondary pressure to the friction surfaces 31, throug the respective channels 16A and 16B.
  • a valve 32 controlled by the primary pressure acts on small piston A, sliding in sealing conditions in small rub bers B in its cylinder C, for the movement, by means of th setting of a spring D adjustable by tie-rod E with sliding head in room F, of the occlusion nozzle with variable capa city G, elastic and moderable, when the discharge of the pressure of the secondary circuit occurs, without trasmit- ting any vibration of its pumping system alternated to the primary ciruit, balanced by spring D acting on the capaci ⁇ ty of nozzle G.
  • the one of spring D follows until the contact of the head of the tie-rod C on stop ring I, and consequent reaction of the spring H with a sufficient setting for the opening of the nozzle G for the immediate interruption of the braking.

Landscapes

  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Braking Arrangements (AREA)

Abstract

The self-blocking hydraulic brake booster is operated by means of the rotation of the disk (16) and the drum of the primary circuit (16A) of the vehicle, so as to result independent from the same for what concerns the blocking effect, automatically adjusted by the pressure of the secondary circuit.

Description

"A S ELF-BLOCKING , HYDRAULI C BRAKE BOOS TER"
The present invention concerns a self-blocking, hydraulic brake booster for vehicles, of the kind using the original primary circuit, controlled by the driver, lowering the working pressure and avoiding the need of the traditional brake booster.
Actually, very expensive and complex systems are used, al with electronic support, for improving the efficiency of the braking of the vehicles, avoiding the blocking of the wheel especially in conditins of low coefficients of adhe rence to the street, but said systems have a high vulnera bility rate and are subject to frequent damages.
The device according to the present invention, due to the use of the original primary circuit controlled by the dri ver, that lowers the working pressure avoiding the need o the conventional brake booster with a greater functioning safety so as to be considered a reserve system, exploits the inertia energy of the vehicle for operating a hydrodi na ic pumping mechanism with variable capacity and with high pressure on the friction surfaces connected to the r tation of the wheels, with the pressure discharge thereof at every slowing down or blocking.
• • • / • • • The most considerable advantages of the device according t the present invention consist in the complete automatism o the brake booster and in the high f nctionality thereof.
The present invention will be described more in detail he- reinbelow relating to the enclosed drawings that show some preferred embodiments thereof.
Figures 1 and 2 show a square section of a self-blocking, hydraulic brake booster according to the present invention for the control of disk brakes.
Figures 3 and 4 show a square section of a variant of the self-blocking, hydraulic brake booster for the control of the jaws of drum brakes.
The figures show a self-blocking, hydraulic brake booster consisting of a cylinder comprised in the plier of a brake 2, or otherwise fixed on the vertical of the wheel's hub i which it may slide, sealed by small rubbers 3, the hollow piston 4 shown in dotted lines in figures 1 and 2, pushed to the end of its run by a spring 5 kept by cup 6 on ela¬ stic ring 6A.
In said hollow piston 4 the lower part of a small piston 7 may slide, pushed by a spring 8 on the end-run metal ring guided by the cup 6 with the dust-cover bushing 6B. The small lever 10, having its fulcrum in pin 11, has hing ed on friction pin 12 sliding-block 13 pushed by the pin- spring 14 in tappet contact with the half-spheric end of the small piston 7 against the alignment stop 12A.
A cam 15, out of one piece with the wheel's hub or to the one of the brake's disk 16, may freely rotate in axis with the sliding-block 13 without touching the same until the pressure of the primary circuit 16A - hydraulic or pneuma- tic - shown by P on the direction arrows and controlled by the pilot, acting on the piston 17 of reduced diameter due to a limited push on the friction surfaces so as to preven the blocking thereof, and acting through the tube 18 on th hollow piston 4 causing the movement thereof towards the cam 15, causes the contact of the sliding-block therewith and the consequent alternate motion of the small piston 7, called by the return spring 8 at the lower run-end deter¬ mined by the metal ring 9.
The sliding of the upper end of the small piston 7 in its cylinder 7A, fed through the groove canalization 19, anu- lar 20 and the small automatic valve 21, with the liquid of the tank 22, may pump at high pressure through the re¬ tention valve 23, hydraul^ oil into the chamber of one piston 24, for the push on the friction surfaces having a greater diameter than the primary one 17, for the maximum braking effect desired or for an uncontrolled need of the pilot . Ad adjustable nozzle 25, by means of a conical screw 25A having a fix and continuous capacity, adjusts the dischar¬ ge of the pressure onto the piston 24 and the consequent blocking of the brake for the stopping of the cam 15 and o pumping 7.
The primary pressure with its reduced braking effect con¬ nects the blocking and the release of the brake. Relating to the primary pressure, adjusted by the pilot, the spring 5 is compressed, the setting thereof determining the run o the small piston 7 and the capacity thereof relating to th rotation speed of the cam 15, for the self-adjusting brak¬ ing and anti-braking effect.
As an alternative to the adjustable nozzle with fixed capa city 25 for an immediate interruption of the braking, the primary pressure acting also on a small piston 26, sealing sliding on small rubbers 27 and 27A in its cylinder, over¬ coming the resistance of spring 28, determines by means of the adjusting of run-end 29 the discharge capacity of the secondary pressure, through the position of the anular light 26A, of the small piston 26 with respect to the one 26B to reservoir 22, which due to gravity keeps operative the whole pumping system.
When the discharge of the primary pressure occurs, control led by the pilot, the spring 28, calling back small piston 26 to its first position, allows an immediate discharge of-
• • •/ • • • the secondary ne through the width of its lights, for an immediate interruption of the braking.
For what concerns the control of the jaws of dram brakes, shown in the variant of figures 3 and 4, a double small cy linder 30 with concentrical chambers, with small discharge valves 30A, may transmit the primary pressure as well as the secondary pressure to the friction surfaces 31, throug the respective channels 16A and 16B.
Relating to the detail shown with dotted lines in figure 4 a valve 32 controlled by the primary pressure, acts on small piston A, sliding in sealing conditions in small rub bers B in its cylinder C, for the movement, by means of th setting of a spring D adjustable by tie-rod E with sliding head in room F, of the occlusion nozzle with variable capa city G, elastic and moderable, when the discharge of the pressure of the secondary circuit occurs, without trasmit- ting any vibration of its pumping system alternated to the primary ciruit, balanced by spring D acting on the capaci¬ ty of nozzle G.
To the discharge of the primary pressure on small piston A controlled by the pilot, the one of spring D follows until the contact of the head of the tie-rod C on stop ring I, and consequent reaction of the spring H with a sufficient setting for the opening of the nozzle G for the immediate interruption of the braking.
• • •/ • • _

Claims

1. A self-blocking, hydraulic brake booster, operated by the inertia energy of the vehicle controlled, by the pilot by the pressure (16A) of the primary hydraulic or pneumati circuit, acting on a pushing surface limited with respect to the friction surfaces so as to prevent the blocking the reof, and on a hollow piston (4) with a spring (5) acting against its sliding, the setting thereof adjusting the secondary braking effect, for the movement of a small pi¬ ston (7) with a return spring (8) housed therein in tappet contact with an anti-friction, or roller, sliding-block (13), towards a cam (15), out of one piece with the wheel' hub or with the brake's disk, with a consequent alternate movement thereof for the pumping at high pressure of hy¬ draulic oil into a pushing cylinder (24) onto the friction surfaces, with a continuous return discharge to the respec tive feeding reservoir (22) through an adjustable nozzle (25) with fix capacity, or through a valve controlled by the primary pressure acting onto a small piston (26) with discharge distribution lights adjustable due to the anti¬ blocking effect, relating to the rotation speed of the dis or of the drim of the brake, so as to determine an immedia te interruption of the braking in its primary position.
2. A self-blocking, hydraulic brake booster according to claim 1, characterized in that the action thereof is deter mined by the pressure of the primary, hydraulic or pneuma- tic circuit (16A), controlled by the pilot, acting also on to a hollow piston (4), sealingly sliding in a cylinder, placed on a vertical to the wheel's hub, in support to a small pumping piston (7), with groove lights (19), anular (20), small automatic feeding valve (21), retention (23) and return spring (8) for its getting nearer, by means of fulcrated anti-friction or roller sliding-block (13), kept in tappet contact by a pin-spring (14), with a cam (15) ou of one piece with the wheel's hub which determines, accord ing to its rotation, an alternate motion forming a pumping system with variable capacity according to the primary pressure, upon the pilot command, which acting onto the setting of the spring (5), adjusts the run of the small pumping piston (7) and the consequent capacity thereof.
3. A self-blocking, hydraulic brake booster according to the precedent claims, characterized, for its anti-block¬ ing function, in an adjustable nozzle (25) with fix capa¬ city with continuous discharge of the secondary pessure (16B), acting on the friction surfaces for a lowering of its values at each capacity reduction of its pumping sy¬ stem according to the rotation of its control cam.
4. A self-blocking, hydraulic brake booster according to the precedent claims, characterized, for its anti-blocking and immediate braking interruption function, in a distribu tor controlled, by the pilot, by the primary pressure, wit variable capacity, adjustable for the anti-blocking and
• • */ • • • maximum capacity effect for an immediate discharge of the secondary pressure.
5. A self-blocking, hydraulic brake booster according to claim 1. characterized, for the linearity of its secondary pressure (16B) generated by an alternate system as already described, in a stabilizing valve (32), controlled by the primary pressure acting onto a small piston (A), sealingly sliding in its cylinder (C), for the charging variation of a spring (D) acting againts the secondary presεule, by means of a nozzle (G) with variable capacity, with an ap¬ propriate pushing relation, with a tie-rod (E), for coupl¬ ing and adjusting of its setting and of return spring (H) for the maximum capacity of nozzle (G) to the discharge of the control pressure, for an immediate interruption of the brakin .
6. A self-blocking, hydraulic brake booster, according to claims 1 and 5, characterized, for the control of the fric- tion jaws for drum brakes, by a double small cylinder (31) having a central support, for the respective feeding and discharge channels of the respectively cyindrical and crown pushing surfaces.
7. A self-blocking, hydraulic brake booster, according to claim 1. characterized in its self-adjusting braking effect on each single front or back wheel of the vehicle, due to the proportional push on the friction surfaces according to the rotation speed of its control cam and to the inertia of the vehicle, with a consequent capacity and pressure varia¬ tion of its pumping system that allows the elimination of the traditional braking correctors.
8. A self-blocking, hydraulic brake booster according to claims 1 and 7, characterized, for the tappet control of its small pumpin piston (7), in an anti-friction sliding- block (13) with a large contact surface on the circumfe- rence of the control cam (15), always kept in its correct rotation angle by a friction hinged pin (12) onto the small contact lever (10), operated by the return pin spring (14) against the blocking of alignment (12A).
9. A self-blocking, hydraulic brake booster according to claims 1 to 7, characterized, for the tappet control of its small pumpin piston (7), in a small lever (10) of appro¬ priate length with fork-ends, for the support of an anti¬ friction roller on the way of the control cam (15).
10. A self-blocking, hydraulic brake booster according to the precedent claims, characterized in its low working pressure by the pilot, of its primary control circuit, wit consequent functioning safety for being considered, for its reduced working, as a reserve system.
PCT/IT1990/000083 1989-10-19 1990-10-18 A self-blocking, hydraulic brake booster WO1991005690A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT04846789A IT1237217B (en) 1989-10-19 1989-10-19 ANTI-LOCKING HYDRAULIC SERVO BRAKE.
IT48467A/89 1989-10-19

Publications (1)

Publication Number Publication Date
WO1991005690A1 true WO1991005690A1 (en) 1991-05-02

Family

ID=11266718

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IT1990/000083 WO1991005690A1 (en) 1989-10-19 1990-10-18 A self-blocking, hydraulic brake booster

Country Status (2)

Country Link
IT (1) IT1237217B (en)
WO (1) WO1991005690A1 (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1801007A1 (en) * 1965-09-29 1969-05-08 Simms Group Res Dev Ltd Braking device
GB1218173A (en) * 1967-01-11 1971-01-06 William Joseph Johnson Improvements relating to the braking of vehicles
DE3618509A1 (en) * 1986-06-02 1987-12-03 Teves Gmbh Alfred Motor vehicle brake system
FR2601310A1 (en) * 1986-07-10 1988-01-15 Cochet Claude Device preventing the wheels of a motor vehicle from locking during braking
DE3906141A1 (en) * 1988-03-10 1989-09-21 Volkswagen Ag Hydraulic motor-vehicle brake system with an anti-lock control device
EP0202845B1 (en) * 1985-05-18 1991-01-02 LUCAS INDUSTRIES public limited company Improvements in hydraulic anti-skid braking systems for vehicles

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1801007A1 (en) * 1965-09-29 1969-05-08 Simms Group Res Dev Ltd Braking device
GB1218173A (en) * 1967-01-11 1971-01-06 William Joseph Johnson Improvements relating to the braking of vehicles
EP0202845B1 (en) * 1985-05-18 1991-01-02 LUCAS INDUSTRIES public limited company Improvements in hydraulic anti-skid braking systems for vehicles
DE3618509A1 (en) * 1986-06-02 1987-12-03 Teves Gmbh Alfred Motor vehicle brake system
FR2601310A1 (en) * 1986-07-10 1988-01-15 Cochet Claude Device preventing the wheels of a motor vehicle from locking during braking
DE3906141A1 (en) * 1988-03-10 1989-09-21 Volkswagen Ag Hydraulic motor-vehicle brake system with an anti-lock control device

Also Published As

Publication number Publication date
IT1237217B (en) 1993-05-27
IT8948467A0 (en) 1989-10-19

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