JPH04505301A - Method of assembling a piston/cylinder device and a force transmission member - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Method of assembling a piston cylinder device and a force transmitting member This pin relates to a method of assembling a cylinder device and a force transmitting member, such as a suppressing member. The stone cylinder device includes a first piston (butsch rod piston) and a first piston. It consists of a second piston (floating piston) connected to the downstream side of the piston in the operating direction. , one central valve is arranged on each of the first and twelfth pistons, and this central valve piston rod piston and the pressure chamber provided in the floating piston. Depending on the movement of the ton, it separates from the unpressurized brake fluid supply reservoir, or Connect to reservoir. Such a central valve is described, for example, in the published German patent application ( DE-OS) 36 29 564. This application is slip control A brake system is disclosed in which the brake sheath is connected via a pressure line. the wheel brakes are connected, actuated by the actuating pedal and provided with auxiliary energy. The braking pressure generator preferably comprises a braking pressure generator and an auxiliary pressure supply system.

This auxiliary pressure supply system consists of a hydraulic pump and a pressure compensating and pressure fluid supply reservoir. , an auxiliary pressure control valve, and detects the rotational state of the wheels to form an electrical braking pressure control signal. It has a wheel sensor and an electronic circuit. This braking pressure control signal , electromagnetically actuated pressure fluid inlet and outlet valves interposed in the pressure fluid line are controlled; Slip control is performed.

In the above application, a switch is inserted into the pressure line of the auxiliary energy source, and this switch is It operates when a predetermined hydraulic pressure is reached and sends an electrical signal to the signal processing coupling circuit, This allows the pump motor to check cycle on and off and visually or An acoustic display indicates whether the motor/pump device can operate or not. It can be recognized by the bar.

As described in the above application, a master cylinder and a negative pressure braking force booster are connected. When assembling the piston/cylinder device and the force transmitting member, One valve is arranged in series with each piston of this device, and as disclosed in the above-mentioned application. This results in disadvantages as will be explained below with reference to the central valve, which is a feature of

The closing stroke of the central valve of the two pressure circuits and its idle stroke are greatly reduced by the assembly. growing. This excessive play stroke is due to the large number of parts in the tandem master cylinder. This is due to the accumulation of numerical tolerances. During this closing stroke, the lever ratio of the pedal If they are multiplied, inconvenience will occur when the pedal is operated.

According to the conventional technology, the tandem master cylinder has a spacing washer and It is assembled except for the suppressing member. After this, the mass connected to the negative pressure brake booster is Determine the dimension, which is the distance between the flange surface of the tar cylinder and the depth of the hole in the pressure member. Cheer. After this, determine the number of spacing washers. Next, this space The washer and suppression member are assembled with the retaining ring.

In this way, conventionally, tandem master cylinder and negative pressure braking force booster It is clear that the assembly is such that there is no play. However, all of the individual parts It is undesirable in that the tolerances of 1 and 2 are accumulated in the central valve closing stroke. This is also the idle stroke of the central valve. The size increases accordingly. As mentioned above, this affects the pedal lever ratio, or transmission ratio. This is inconvenient in that it can be multiplied.

The objects of the present invention are as follows.

The aforementioned disadvantages of the prior art should be avoided. The closing stroke of the central valve should be shortened. be. It is necessary to avoid accumulating the tolerances of individual parts and including them in the closing stroke of the central valve. It is possible.

The cost of assembling the cylinder should be reduced.

Adjustment of the closing stroke of the central valve should be made within the range of full cylinder adjustment.

It should be possible to use parts with large tolerances. This results in Production costs can be reduced.

According to the present invention, the above object is to assemble a piston/cylinder device and a force transmitting member. This is solved by a special method for According to this method, especially floating pistons The free stroke of the central valve disposed in the central valve, preferably between the opening member of the central valve and the valve seat. In order to reduce the travel distance of at least one of the The central valve is moved in the pressure increasing direction together with this floating piston, and the bush rod piston is simultaneously located on two pistons while the central valve located in the open position is located in the open position. A measuring medium, in particular air, is applied to a pressure chamber with a central valve. We measured the pressure in the pressure chamber of the floating piston, which increased significantly due to the initial pressure of the central valve. Using the distance from the position to the position of significant increase (measured distance), especially the pressing member In particular, spacing washers arranged between the force transmitting member and the bushing rod piston dimension the washer or washers that are the holder.

In a particularly preferred method, which is suitable for automation, the pressure medium, in particular compressed air, is The force chamber is blown or filled, and this air is first passed through the central valve to provide the braking fluid. into the channel leading to the supply reservoir and move both pistons away from the brake pedal. move in the direction and measure the air pressure in the second pressure chamber during the movement of these pistons. However, the measuring distance of the floating piston is limited by the significant increase in air pressure when the central valve closes. A distance between the force transmitting member and the piston is determined, and this measured distance is determined by as information for determining the dimensions of one or more spacers that are washers. use

In other embodiments of the above method, the same pressure is applied to the side pressure chambers.

Furthermore, it is also possible to apply different high pressures to the two chambers.

This method places the A trigger point is defined for the measurement that limits the measurement distance. this straight line part shows a significant increase in pressure due to movement of the central valve.

Assembled using the above method, the force of the brake booster is transferred to the brake booster of the master cylinder. Master cylinder and braking force booth with a pressure member that transmits pressure to the head piston The unit includes one or more spacers, in particular spacing washers. The structure is placed between the bush rod piston of the master cylinder and the pressure member. and the one or more spacers are dimensioned by at least one measured distance. Ru.

An apparatus has been proposed for use in carrying out the above method, which includes a floating piston. The dynamic distance measuring device and the second pressure chamber of the master cylinder, which is in particular pneumatic. A pressure measuring device is provided to detect pressure changes and significant pressure increases due to piston movement. An information processing unit is provided for determining the measurement distance to.

Furthermore, a movement measuring device of the floating piston and a second pressure chamber of the master cylinder are provided. A device equipped with an internal pressure measuring device was proposed, and a device was proposed in which the pressure was changed by piston movement. and the trigger point during the change in pressure increase, especially the final part of the pressure increase, and the trigger point. An information processing unit is provided that determines the measured distance of the piston to the gas point. .

Furthermore, based on the measured distance, the dimensions of the spacer, especially the spacing washer, and A device is provided for determining and displaying at least one of the number and the number.

Details of the invention will emerge from the following description of two exemplary embodiments. these fruits Examples will be described with reference to two drawings.

FIG. 1 shows a master cylinder assembled with a negative pressure brake booster.

FIG. 2 is an air pressure-travel distance diagram.

The master cylinder shown in FIG. 1 includes a housing 1 and, in particular, a spacer 8. The pressing member 9 is pressed by a plurality of spacing washers and a negative pressure braking force booster. Conveys the transmission force applied to. Spacer 8 or multiple spacing washers The shaft transmits this force to the bush rod piston 2.

The tandem master cylinder and negative It can be assembled with a pressure-type braking force booster without any play. The disadvantage of this method is , in that all the tolerances of the individual components are integrated into the closing stroke of the second central valve.

On the pedal side, the pedal transmission ratio is multiplied by the large play stroke of the second central valve, resulting in control. This causes inconvenience in the operation of the electric pedal.

In the method of the invention described below, from the flange surface 10 to the bottom 33 of the compression member hole 7 The dimensions up to are determined with the central valve 14 closed, and the process is as shown in FIG. It is represented by an iagram (graph).

The abscissa indicates the second central valve or the floating piston in which this second central valve is incorporated as an integral part. The vertical axis represents the displacement of the stone, while the vertical axis represents the pressure in the second pressure chamber 18 during measurement. represents size.

In the tandem type master cylinder, the spacer 8 or the bottom 33 of the blind hole of the spacer member The dimensions between are determined by measuring air pressure. Details are shown below.

The side pressure chamber 11.18 is supplied with air from two compressed air sources 34.35. Apply pressure. For this purpose, there are two pressure connections 19.36 on the master cylinder. It is used to supply compressed air to the pressure chamber 11.18. ′! J1 pressure The compressed air filling the force chamber 11 moves in the direction separating the two pistons 2.3. This first central valve 6 assists the action of the biasing spring 12 and when the first central valve 6 opens. Between the closing member 5 and the valve seat 4 of the valve 6 is a radially arranged hole 20.21 and an annular channel. Evacuation via chamber 22, channel 23 and connection 24 to the supply reservoir be done. However, this connection 24 may be closed during the measurement, for example by means of a suitable closure 37. It can also be closed.

Pressurization of the first pressure chamber ensures that relative movement of the two pistons is eliminated. During the measurement, the central valve 6 of jJl remains open.

The compressed air injected into the second pressure chamber 18 is The initial air pressure is indicated at point 25, through which the second central valve 14 is initially in the open position. Radial bore 40° 41, annular chamber 42, passage 38 and connection to supply reservoir 39 and is discharged to the outside. The air pressure filled in the first pressure chamber 11 is Preferably, it is higher than the air pressure acting on the two-pressure chamber 18. And both pis Tons 2 and 3 are moved to the left in FIG. Initially, the air pressure in the second pressure chamber 18 remains approximately constant as shown by straight line 26 in FIG.

At point 27 on the abscissa, the floating piston 3 begins to move, and the central valve 14 closes. continues until it begins.

The cross-sectional area of the opening for air to pass between the valve member 15 and the valve seat 16 of the second central valve 14 is reduced. Do a little. This means that the air pressure in the second pressure chamber 18 increases. child The state of , is a straight line 28 over a wide range. Finally, the second central valve 14 closes, Increased pressure acts within the pressure chamber 18 . This is done directly in the diagram. It is represented by line 29.

During the leftward movement of the floating piston 3, the pressure in the pressure chamber 18 is continuously measured. . At the end of the straight line 28, a trigger point 30 is defined for measurement. this The trigger point defines a point 31 on the abscissa. Zero on the abscissa The distance between the points 31 is the measured distance 32.

This measured distance, i.e. the second central valve 14 or the trigger point of the floating piston 3 The distance to the point 30 is the distance between the suppressing member 9 and the bushing rod piston 2. A spacer 8 or one or more spacers interposed between the used as information for sizing washers.

However, in the present invention, two pressure chambers/(11,1 It is also possible to add compressed air at the same pressure to 8. During the measurement, the relative position of the piston 2.3 To ensure that no movement occurs, the channel leading to the reservoir connection 24 is closed during the measurement. 23 must be closed airtight, and in this case, the above-mentioned closed international search report international search report

Claims (1)

[Claims] 1. The first piston (bush rod piston) and the downstream side of the first piston in the operating direction a second piston (floating piston) connected to the first and second pistons. A central valve is arranged on each piston, and this central valve is a bush rod piston. The pressure chamber in the piston and the floating piston is depressurized as the piston moves. A piston separate from or connected to the brake fluid supply reservoir of A method for assembling a force transmitting member such as a pressing member and a force transmitting member, the method comprising: , In particular, the idle stroke of the central valve (14) arranged on the floating piston (3) is preferred. In other words, the moving distance of at least one of the closing member (15) and the square seat (16) of the central valve. In order to shorten the floating piston (3), in particular the central valve, which is an integral part of the floating piston (3), is The inside of the push rod piston (2) moves in the pressure increasing direction together with the piston. the two pistons (2, 3) at the same time while the central valve (6) is in the open position. A measuring medium, in particular air, is applied to the evacuated pressure chamber (11, 18), The pressure chamber of the floating piston (3) increases significantly due to the closing action of the central valve (14). (11) Measure the pressure within, and measure the distance from its initial position to the position of significant increase (measured Distance) (32) is used to connect the force transmitting member, which is the suppressing member (9), and the bushing rod. 1 or 2, in particular a spacing washer, placed between the piston (2) A method characterized in that a number of washers (8) are dimensioned. 2. A pressure medium, in particular compressed air, is ejected into both pressure chambers (11, 18) and this air is first passed through the central valve (6, 14) to the brake fluid supply reservoir. into the channels (23, 38) and both pistons (2, 3) from the brake pedal. moving away and measuring the air pressure in the second pressure chamber (18), the central valve Define the measuring distance of the floating piston (3), which is limited by a significant increase in air pressure upon closing. Therefore, this measured distance is determined between the force transmitting member (9) and the push rod piston (2). the dimensions of the spacer or spacers (8), in particular spacing washers, to be arranged; 2. The method according to claim 1, wherein the method is used as information for establishing a law. 3. Claim characterized in that the same pressure is applied to both pressure chambers (18, 11). The method described in 1 or 2. 4.Specifically, different high pressures are applied to the two chambers (18, 11). 3. The method according to claim 1 or 2, wherein the method comprises: 5. a chamber located in the first pressure chamber (11) and leading to the brake fluid supply reservoir; Method according to claim 3 or 4, characterized in that the flannel (23) is closed. 6. A particularly straight line showing a significant increase in pressure due to movement of the central valve in the pressure-travel curve. The line section (28) is located at the end of this curve and is the measuring point that limits the measuring distance. 6. A trigger point (30) according to claim 1 or 5, characterized in that: the method of. 7. A piston/cylinder assembled by the method according to any one of claims 1 to 6. one or more spacing units, in particular spacing washers; The push rod piston (2) of the master cylinder (8) and the pressing member (9) and the dimensions of this spacer are defined by at least one measurement distance (32). A piston/cylinder unit that is characterized by being 8. 7. An apparatus for use in the method according to claims 1 to 6, wherein the floating piston has a moving distance. Measuring device and pressure measurement in the second pressure chamber of the master cylinder, in particular pneumatic A constant device is installed to prevent pressure changes due to piston movement and significant pressure increases. A device characterized in that it is provided with an information processing unit that determines a measurement distance. 9. Floating piston movement measuring device and in the second pressure chamber of the master cylinder A pressure measuring device, especially pneumatic pressure, is installed to measure pressure changes due to piston movement. , the trigger point during the change in pressure increase, especially the final part of the pressure increase, and the trigger point The information processing unit that determines the measured distance of the piston to the point is thrown. 9. The device according to claim 8, characterized in that: 10. The dimensions of the spacer, especially the spacing washer, based on the measured distance and The apparatus according to claim 8 or 9, further comprising a device for determining and displaying at least one of the number and the number. Place.