KR20150068915A - Slip-controlled hydraulic vehicle brake system and combination of a pressure vibration damper and a check valve for such vehicle brake system - Google Patents

Abstract

The present invention relates to a hydraulic vehicle brake system (1) of a slip control method comprising a hydraulic pump (9) wherein a pressure vibration damper (14) and a throttle (15) are connected on a pressure side. The present invention provides a check valve (16) to block in the direction of the pressure vibration damper (14). Therefore, elasticity of the pressure vibration damper (14) is not provided when a brake is operated to a main brake cylinder (2) without slip control.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a hydraulic system vehicle brake system of a slip control type and a combination of a pressure vibration damper and a check valve for the brake system,

The present invention relates to a combination of a slip control type hydraulic vehicle braking system according to the preamble of claim 1 and a pressure vibration damper and a check valve for the vehicle brake system according to the preamble of claim 5.

Slip control type Hydraulic brake systems are basically disclosed, and these brake systems are abbreviated as ABS, ASR, FDR and ESP, which enable anti-lock braking, slip control and electronic stability program control. As an example of the hydraulic brake of the slip control system, reference is made to the publication DE 195 01 760 A1. The vehicle brake system includes a main brake cylinder, and the vehicle brake system is connected to the main brake cylinder by a separation valve. A separation valve is provided for each brake circuit. The wheel brakes are hydraulically connected in parallel to the isolation valves by a pressure relief valve, often referred to as an inlet valve. Wheels For each individual slip control, a pressure boosting valve is assigned to each wheel brake. By means of a pressure relief valve, often referred to as a discharge valve, the wheel brakes are connected to the suction side of a hydraulic pump, also called a return pump. A hydraulic pump is provided in each brake circuit. A pressure vibration damper is connected to the pressure side of the hydraulic pump, a throttle is connected to the rear of the pressure vibration damper, and the throttle is connected between the separation valve and the pressure increase valves. The pressure vibration damper generally has a constant or variable damper volume, the volume is filled with brake fluid, and is connected to the pressure side of the hydraulic pump and the throttle. For variable damper volumes, pressure vibration dampers are disclosed which include a piston, a membrane, a bellows or an elastic damping member operated by spring or gas pressure, the volume of which is varied by elastic deformation upon pressure. The pressure vibration damper damps the pressure oscillation and the pressure surge of the brake fluid even if it has a fixed damper volume, and the variable volume is damped and / or the throttle connected to the rear improves the damping effect, especially when the volume varies. The pressure vibration damper damps the pressure vibration and the pressure surge due to the structure of the piston pump to be delivered in a generally used pulse system on the pressure side of the hydraulic pump of the slip control type vehicle brake system. During the slip control, the response of the pressure surge to the foot brake pedal or the hand brake lever is reduced by the pressure vibration damper, the comfort is increased, and the noise generation is reduced.

During normal braking operation, that is, when operating a commercial brake without slip control, the pressure vibration damper is connected to the main brake cylinder through a separation valve opened at the pressure side of the hydraulic pump of the slip control type hydraulic vehicle brake system . The pressure vibration damper is a volume connected to the main brake cylinder, and this volume is undesirable because it enlarges the elasticity of the vehicle brake system. The elasticity can be reduced by the reduction of the damper volume, which provides a disadvantage that the pressure vibration damping is weakened. Though the elasticity can be prevented by the throttle having a small through-hole and a large flow resistance, the large flow resistance increases the load of the hydraulic pump, stops the rise of the brake pressure by the hydraulic pump, May be required.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a slip control type hydraulic vehicle brake system that operates to increase comfort and reduce noise generation, and a combination of a pressure vibration damper and a check valve for the brake system.

This problem is solved by a hydraulic vehicle brake system comprising the features of claim 1 and a combination of a pressure vibration damper and a check valve for the brake system comprising the features of the independent claim.

A hydraulic brake system of a slip control type according to the present invention including the features of claim 1 includes a pressure vibration damper, a throttle and a check valve on the pressure side of a hydraulic pump, and the check valve includes a pressure vibration damper On the other hand, it is disposed between the separation valve and the pressure increasing valve and blocks in the direction of the pressure vibration damper. It is also possible to implement a vehicle braking system that does not include a split valve, wherein one or more pressure-up valves, hydraulically connected in parallel, in this braking system are directly connected to the main brake cylinder. The pressure vibration damper on the pressure side of the hydraulic pump is in this case connected between the main brake cylinder and the pressure rise valve (s) through the throttle and check valve. The order of the throttle and the check valve may be reversed, that is, the throttle can be arranged in front of or behind the check valve as viewed in the direction of the pressure vibration damper. When the vehicle brake system not including the vehicle brake system or the separation valve is operated by the main brake cylinder when the separation valve is opened, the check valve is closed, thereby separating the pressure vibration damper from the main brake cylinder hydraulically, The damper volume does not include the brake fluid displaced from the main brake cylinder and therefore the pressure vibration damper does not cause additional resilience of the vehicle brake system. A smooth pedal or lever sensation is blocked by the foot pedal or (hand) brake lever. Another advantage of the present invention is the protection of the pressure vibration damper against the high main brake cylinder pressure generated by the operation of the main brake cylinder.

The dependent claims present preferred embodiments and improvements of the invention as set forth in claim 1.

The object of claims 6 to 11 is an embodiment of a preferable combination of the pressure vibration damper and the check valve of the vehicle brake system according to the present invention.

Other features of the invention are set forth with regard to the claims and the drawings in the following description of embodiments of the invention. The individual features may be embodied in embodiments of the present invention, either alone or in any combination thereof. The present invention is described below with reference to the embodiments shown in the drawings.

Brief Description of the Drawings Fig. 1 is a hydraulic circuit diagram of a slip control type vehicle brake system according to the present invention. Fig.
Figs. 1A and 1B are detailed views of a modification of the vehicle braking system according to the present invention in accordance with the arrow I in Fig.
2 shows a hydraulic circuit diagram of a modified slip control type vehicle braking system according to the present invention.
3 is a view showing a combination of a pressure vibration damper, a throttle and a check valve in the hydraulic vehicle brake system of FIG. 1 according to the present invention.

The hydraulic brake system 1 of the slip control type according to the present invention shown in Fig. 1 includes two brake circuits I and II, which are connected to two circuits-the main brake cylinder 2 . The two wheel brakes 3 are connected to the respective brake circuits I and II and the number of the two brake circuits I and II and the number of the two wheel brakes 3 ) Is not essential in the present invention.

One pressure increasing valve 4 and one pressure reducing valve 5 are assigned to each wheel brake 3. The pressure increase valves 4 are 2/2-way magnetic valves that open at the base position of the currentless state, and the pressure drop valves 5 are 2/2-way magnetic valves that are closed at the base position of the no current. The check valves 6 which can be perfused from the wheel brake 3 toward the main brake cylinder 2 are hydraulically connected in parallel to the pressure increase valves 4.

Each of the brake circuits I and II has a separation valve 7 and the brake circuit is connected to the main brake cylinder 2 by the separation valve. And the pressure increasing valves 4 are connected to the separation valve 7. The check valve (8) is connected in parallel to the distribution valve, and the check valves are connected to the main brake cylinder (2) from the main brake cylinder And is flown in the direction of the brake (3). The separation valves 7 are not essential to the present invention and may also be embodied in a vehicle braking system 1 that does not include a separation valve 7. In this vehicle braking system, And is connected to the main brake cylinder 2. This vehicle brake system 1 according to the present invention is shown in Fig. In this case, the check valves 8 connected in parallel with the separation valve 7 are also omitted. Only the difference from FIG. 1 will be described with reference to FIG. 2, and the description of FIG. 1 is referred to in addition to the above.

Each of the brake circuits I and II includes a hydraulic pump 9 and the wheel brakes 3 are connected to the suction side of the pump through a pressure drop valve 5. [ Further, the suction side of the hydraulic pump 9 is connected to the main brake cylinder 2 via the suction valve 10. [ The suction valves 10 are 2/2-way magnetic valves which are closed at a basic position of no current. The intake valves 10 are not essential to the present invention and are omitted in Fig.

A hydraulic reservoir 11 is also connected to the suction side of the hydraulic pump 9 and the hydraulic reservoir stores the brake fluid discharged from the wheel brake 3 by the opening of the pressure drop valves 5 during the slip control . In the case of the vehicle brake system 1 shown in Fig. 1, check valves 12 are arranged between the hydraulic reservoir 11 and the suction side of the hydraulic pump 9, and the check valves are connected to the hydraulic pump 9 ). ≪ / RTI > The vehicle brake system 1 shown in Fig. 2 is provided on the suction side of the hydraulic pump 9 on the one hand with the pressure drop valve 5 and the hydraulic pressure reservoir 11 and on the other hand, It does not include such a check valve 12. [ The hydraulic pumps are driven by a common electric motor (13).

The pressure increasing valve 4 and the pressure reducing valve 5 form a brake pressure regulating valve device and the wheel brake pressure can be individually adjusted in the wheel brake 3 for slip control by the device. The main brake cylinder 2 can be separated from the vehicle braking system 1 hydraulically since the hydraulic pumps 9 are driven for the slip control and the separation valves 7 can be closed for the slip control . The suction valve 10 can be opened for suction of the brake fluid. The slip control is disclosed, for example, as an anti-slip control, a slip control and an electronic stability program control (ABS, ASR, ESP, FDR) and is not described in detail here.

The vehicle brake system 1 as the oil chamber pump 9 includes a double piston pump, and each of the brake circuits I and II includes a pump member having a pump piston. In other words, each of the brake circuits I and II includes a single piston pump with a pump piston.

A throttle 15 and a check valve 16 are connected to the pressure side of the hydraulic pump 9 following the pressure vibration damper 14 and the check valve is connected between the separation valve 7 and the pressure increase valves 4 . The check valve 16 is capable of flowing in the direction of the separation valve 7 and the main brake cylinder 2 and in the direction of the pressure increasing valve 4 and the wheel brake 3 and the hydraulic pump 9 In the direction of the flow. In the illustrated embodiment of the present invention, the check valve 16 does not include a spring, but a spring actuated check valve (not shown) may also be considered. The pressure vibration damper 14 is preferably a piston pump in which a hydraulic pump 9 is structurally driven in a pulsed manner and generates a pressure surge at the start of a delivery or discharge stroke, Pressure damping and pressure surge in the brake fluid to be generated is particularly damped by interacting with the throttle 15. [ The pressure vibration damping improves the comfort of the vehicle brake system 1 because the pressure vibration and the pressure surge of the brake fluid generated during the delivery of the hydraulic pump 9 during the slip control are released when the separation valve 7 is opened And reaches the main brake cylinder 2 by damping. When the vehicle brake system 1 is actuated by the main brake cylinder 2 when the release valve 7 is opened when the hydraulic pump 9 is not in a stopped state and the check valve 16 is shut off, In this case, the pressure vibration damper 14 is separated from the main brake cylinder 2. Therefore, when the vehicle brake system 1 is operated by the main brake cylinder 2 without slip control, that is, when the hydraulic pump 9 is stopped, the damper volume of the pressure vibration damper 14 is controlled by the vehicle brake system 1). A smooth pedal feel to the brake pedal of the main brake cylinder 2 and a pedal path extending generally through the damper volume of the pressure vibration damper 14 or an operation path of the main brake cylinder 2 are generally prevented.

2, when the vehicle brake system 1 does not include the isolation valve 7, the check valve 16 is closed when the vehicle brake system 1 is stopped at the time of stopping the hydraulic pump 9, So that the pressure vibration damper 14 is separated from the main brake cylinder 2. As shown in Fig. The pedal path or the operating path of the main brake cylinder 2, which extends through the damper volume of the pressure vibration damper 14 and the smooth pedal feel of the brake pedal of the main brake cylinder 2, As in the case where the pressure increasing valves 4 are directly connected to the main brake cylinder 2 without including the separating valve 7.

An additional check valve 17 is hydraulically connected in parallel to the throttle 15 and the check valve 16 which are arranged in series in a hydraulic manner and the additional check valve is provided with a check valve 16, Is able to flow in the direction of the cylinder 2 and the pressure increasing valve 4 and the wheel brake 3 and blocks the flow into the pressure vibration damper 14 and the flow toward the pressure side of the hydraulic pump 9. [ The additional check valve 17 is spring operated and has a higher opening pressure than the check valve 16. The opening pressure of the additional check valve 17 is, for example, 20 bar. The check valve 17 also forms a kind of bypass valve which provides an additional flow cross section when the pressure applied to the pressure side of the hydraulic pump 9 is higher than the open pressure without a throttle. The drive output and the flow resistance of the hydraulic pump 9 decrease and the delivery amount increases, for example, a faster pressure rise is possible. The additional check valve 17 is not necessarily required.

In the variant shown in FIGS. 1A and 1B, the throttle 15 and the additional check valve 17 are hydraulically connected in parallel, and in the embodiment the check valve 16, which does not include a spring or has a lower opening pressure, In which the check valve 16 is hydraulically connected behind the throttle 15 and the additional check valve 17 in figure 1a and the check valve 16 is hydraulically connected to the throttle 15 and the additional check valve 17, And is connected to the front. The modifications of Figs. 1A and 1B are also possible in the vehicle brake system 1 shown in Fig.

3 shows a coupling 18 according to the present invention of a pressure vibration damper 14, a throttle 15, a check valve 16 not including a spring, and a further check valve 17. The pressure vibration damper 14 includes a tubular damper housing 19, one end of which is closed and the other end is open. The damper housing 19 is provided with a damper member 20 made of a rubber elastic elastomer having a tube shape and an outer side corrugated shape and likewise one end of the member is closed and the other end is opened. The closed end of the damper member 20 is disposed at the closed end of the damper housing 19 and the open end of the damper member 20 is disposed at the open end of the damper housing 19. [ The open end of the damper member 20 includes a vulcanized retaining ring which is press fit into the open end of the damper housing 19 for securing the damper member 20 in the damper housing 19. [ do. The retaining ring 21 protrudes from the open end of the damper member 20 and the open end of the damper housing 19.

The two check valves 16 and 17 and the throttle 15 are disposed in the valve housing 22. The valve housing 22 is made of plastic and has a cylindrical shape and two through-holes parallel to the axis. One of the through-holes has an inlet 23 of the pressure-oscillating damper 14 And the other through-holes form the discharge portion 24. As shown in Fig. The discharge portion 24 includes a conical ring step, which forms the valve seat 25 of the additional check valve 17. The additional check valve 17 includes a step-like diameter cylindrical shut-off body 26, which includes a ring step that interacts with the valve seat 25. A compression helical spring is inserted in the discharge portion 24 and the spring forms a valve closing spring 27 of the additional check valve 17 and the ring step of the shut- Pressure. The opening pressure of the additional check valve 17 is, for example, 20 bar.

The shut-off body 26 of the additional check valve 17 is a hollow body, and a check valve 16, which does not include a spring, is disposed in the hollow body. The spring-free check valve 16 includes a ball as the shut-off body 28 and the ball interacts with the conical valve seat 29 formed in the shut-off body 26 of the additional check valve 17 . The shut-off body 26 of the additional check valve 17 includes a coaxial through-hole as a throttle 15 and the hole has a small diameter of, for example, 0.3 mm and leads into the valve seat 29. The two check valves 16 and 17 are hydraulically connected to each other in parallel by arranging the check valve 16 not including a spring in the shut-off body 26 of the additional check valve 17, That is, hydraulically connected in series.

The protruding retaining ring 21 of the pressure vibration damper 14 is inserted into the cylindrical depression 30 of the valve housing 22 so that the pressure vibration damper 14, the two check valves 16, 17, The throttle 15 forms an assembly 31 that can be handled and mounted as a component. The assembly 31 is generally cylindrical.

The inner space of the damper member 20 called the damper volume 32 is filled with the brake fluid and is connected to the pressure side of the hydraulic pump 9 through the inflow portion 23, The main brake cylinder 2, the pressure increasing valve 4, and the wheel brake 3, respectively. The damper volume 32 is varied by the elasticity of the damper member 20 and damps pressure oscillation and pressure surge of the brake fluid on the pressure side of the hydraulic pump 9. [ The rear throttle 15 improves the damping effect. 1, when the pressure vibration damper 14 is operated for the operation of the vehicle braking system without slip control, that is, when the hydraulic pump 9 is stopped and when the release valve 7 is opened, The two check valves 16 and 17 separate the pressure vibration damper 14 from the main brake cylinder 2 hydraulically. As a result, the variable damper volume 32 is not used during operation of the vehicle brake system 1 by the main brake cylinder 2, and does not cause elasticity.

The brake fluid flows into the pressure vibration damper 14, that is, into the damper member 20 through the inlet portion 23 and the check valve 16 not including the spring is opened And the brake fluid flows toward the separation valve 17 and the pressure increasing valve 4 through the discharge portion 24 through the throttle 15 and the open check valve 16 not including the spring. If the pressure on the pressure side of the hydraulic pump 9 is increased beyond the opening pressure of the additional check valve 17, for example 20 bar or more, the additional check valve 17 is also opened and the pressure from the pressure vibration damper 14 And provides an additional flow cross-section without throttle at the outlet 24 for draining the brake fluid.

The coupling 18 formed as the assembly 31 consisting of the pressure vibration damper 14 and the additional check valves 16 and 17 without the spring and the throttle 15 is connected to the hydraulic block 38 of the vehicle braking system 1 ). ≪ / RTI > The depression forms a receiver (33) for the assembly (18) or assembly (31). The valve housing 22 is disposed in the receiving portion 33 and the damper housing 19 protrudes from the hydraulic block 38. The open end of the damper housing 19 is formed as a crimp connection 34 which plastically deforms the material of the hydraulic block 38 into the annular groove 35 of the crimp connection 35 when press- The assembly 31 is fixed in the accommodating portion 33 and the damper housing 19 is sealed in the accommodating portion 33. [

The plastic valve housing 22 has an annular sealing lip 36 at two ends that seal the valve housing 22 within the receiving portion 33 of the hydraulic block 38. The valve housing 22 also has a connecting socket 37 on the side remote from the pressure-oscillating damper 14, the connecting socket comprising an annular sealing bead, the sealing bead being coaxial with respect to the inlet 23 , And seals the inlet portion (23) in the hydraulic block (38).

3, in which only a portion surrounding the assembly 31 is shown in the hydraulic block 38, in addition to the assembly 31, other hydraulic components of the vehicle braking system 1, namely the hydraulic pump 9, the magnetic valves 4, 7 and 10, check valves 6 and 8 and a hydraulic reservoir 11 are provided and are hydraulically connected to each other through the bore of the hydraulic block 38. [ In the case where the hydraulic members are mounted, the hydraulic block 38 can be grasped as a hydraulic assembly of the slip control device of the hydraulic type vehicle braking system 1. This hydraulic block 38 is disclosed by a slip control type vehicle braking system and is not described here anymore.

1 Vehicle Brake System
2 Main brake cylinder
3 wheel brakes
4 Pressure increase valve
5 Pressure drop valve
9 Hydraulic pump
11 Hydraulic reservoir
14 Pressure vibration damper
15 throttle
16 check valve
17 Check Valve
19 Damper housing
20 damper member

Claims (11)

A slip control type hydraulic vehicle brake system comprising a main brake cylinder (2) and a hydraulic pump (9), the wheel brake (3) being connected to the main brake cylinder via a pressure increasing valve (4) The suction side of the pump is connected to the wheel brake 3 via a pressure drop valve 5 and the pressure side of the hydraulic pump is connected to the pressure difference between the main brake cylinder 2 and the pressure increase valve 4 through a throttle 15. [ , And a pressure vibration damper (14) is connected between the pressure side of the hydraulic pump (9) and the throttle (15). In the vehicle braking system,
On the other hand, a check valve 16 is provided between the main brake cylinder 2 and the pressure increasing valve 4 in the direction of the pressure vibration damper 14 on the one hand and the pressure vibration damper 14 on the other hand. Is disposed on the vehicle body side. 2. A vehicle according to claim 1, characterized in that said check valve (16) is arranged on the one hand between said throttle (15) and on the other hand between said main brake cylinder (2) Brake system. The vehicle brake system according to claim 1, wherein the check valve (16) is disposed between the pressure vibration damper (14) and the throttle (15). The hydraulic brake system according to claim 1, wherein a separation valve (7) is arranged between the main brake cylinder (2) and the pressure increasing valve (4), and the pressure side of the hydraulic pump (9) Is connected between the separation valve (7) and the pressure increasing valve (4) via a check valve (16). 2. A vehicle brake system according to claim 1, characterized in that an additional check valve (17) which blocks in the direction of the pressure vibration damper (14) is hydraulically connected in parallel to the throttle (15). A combination of the pressure vibration damper (14) and the check valve (16) for the hydraulic vehicle brake system (1) according to claim 1,
The pressure vibration damper (14) includes a tubular damper housing (19) in which a deformable damper member (20) in the form of a tube is disposed and the inner space of the damper member (20) , And the volume is varied by the deformation of the damper member (20). A combination of the pressure vibration damper (14) and the check valve (16) for the hydraulic vehicle brake system (1) according to claim 1,
The check valve 16 includes a valve housing 22 which is penetrated by two through holes 23 and 24 which are connected to a pressure vibration damper 14, The through holes form an inlet portion 23 directed toward the inside of the pressure vibration damper 14 and the other through holes form a discharge portion 24 directed to the outside of the pressure vibration damper 14 and one And the check valve (16) of the check valve (16) is disposed. 8. A combination of a pressure vibration damper and a check valve as claimed in claim 7, wherein two check valves (16, 17) are arranged in one through hole, and the check valves have different opening pressures. 9. A check valve according to claim 8, characterized in that the check valve (17) comprises a valve seat (29) for the other check valve (16) And a body (28) is disposed on the outer circumference of the body (28). A combination of the pressure vibration damper (14) and the check valve (16) for the hydraulic type vehicle brake system (1) according to claim 1,
Since the pressure vibration damper 14 includes a damper housing 19 and the check valve 16 includes a valve housing 22 and the two housings 19 and 22 are engaged, (14) and said check valve (16) form an assembly (31). 11. The vehicle brake system (1) according to claim 10, characterized in that the assembly (31) is formed as a mounting portion for pressure-sealing insertion into a receiving portion (33) of a hydraulic block (38) A combination of a pressure vibration damper and a check valve.

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