JPS588600Y2 - Boot mounting structure in hydraulic control valve device - Google Patents

Description

[Detailed description of the invention] The present invention has a bushing rod that is actuated by depression of the brake pedal attached to the outer end of a piston that is fitted into the housing so that it can reciprocate in the axial direction, and The present invention relates to an improvement in a boot mounting structure suitable for use in a hydraulic control valve device in which braking pressure applied to a wheel cylinder is generated by external hydraulic pressure by operating a throttle valve incorporated in the housing.

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, a pipe line P1. A vehicle hydraulic control valve device 100 is installed in P2.

The hydraulic control valve device 100 is operated by operating a brake pedal 12, and includes a housing 20 fixed to a vehicle body (not shown), a spool 30 built into the housing 20, a human-powered piston 40, and a reaction-force piston 50. There is.

The housing 20 has a stepped inner hole 21 therein, and a medium diameter inner hole 21a of the stepped inner hole 21 has a first port 22 communicating with the hydraulic pump 10 through a pipe line P1, and a first port 22 communicating with the hydraulic pump 10 through a pipe line P2.
A second port 23 that communicates with the power steering device 11 through the pipe P3 and a third port 24 that communicates with the wheel cylinder 13 through the pipe P3 are opened, and a large diameter inner hole 21b of the stepped inner hole 21 has a pipe P4 passed therethrough. A fourth port 25 communicating with the reservoir 14 is open.

Further, a pair of annular grooves 26 and 27 are provided in the medium diameter inner hole 21a of this housing 20.
communicates with the second port 23, and the left groove 27 communicates with the third port 24.

The spool 30 is fitted into the medium diameter inner hole 21a of the housing 20 so as to be slidable in the axial direction, and has one end.
It is biased rightward by a return spring 38 that is engaged with the inner hole stepped portion 21c, and the fourth
The port 25 forms a first oil chamber R1 that is always open, and a second oil chamber R2 is formed in the medium diameter inner hole 21a of the housing 20.
is formed.

Additionally, there are two lands 31.3 on the outer periphery of this spool 30.
2 and 2 annular grooves 33 and 34 are provided, and a bottomed inner hole 35 is provided at the axial center.

Furthermore, the bottom of the bottomed inner hole 35 is a communication hole 36 provided in the axial direction.
The second annular groove 34 communicates with the second oil chamber R2 through the communication hole 37 provided in the radial direction.
is connected to.

In this spool 30, the first land 31 has a first annular groove 3 with which the first boat 22 always communicates.
3 and the annular groove 26 through which the second boat 23 communicates, a throttle valve V1 (open center type control valve) is configured.
A normally closed shutoff valve V2 is configured to control communication between the annular groove 2T and the second annular groove 27, and a normally open shutoff valve v3 is configured to control communication between the annular groove 2T and the second annular groove 34. At times, the throttle valve vl is in a fully open state as shown in the figure.

The input piston 40 is connected to the housing 20 via a seal member.
It is fitted into the large diameter inner hole 2Ib so as to be slidable in the axial direction, and elastically engages with the spool 30 at the flange 40a via the coil spring 41 and the annular retainer 42. It is operatively connected to the brake pedal 12 via an operating rod 43 at its right end inner hole.

Also, on the outer periphery of the right end of this piston 40,...Using 2
A stopper 44 fixed to the right end of 0 with a clip 45
A pair of nuts 46, 46 which define the movement stroke of the input piston 40 by coming into contact with them are fixed, and an annular projection 46a is integrally provided at the left end of each nut 46.

One end of the boot 47 is fitted into the outer periphery of the right end of the housing 20, and the other end of the boot 47 is removably fitted into the annular groove formed by these nuts 46, 46.

Note that the initial position of the retainer 42 (that is, the initial elastic force of the coil spring 41) is set by a clip 48 fitted to the small diameter portion of the left end of the input piston 40, and when the input piston 40 is operated, the retainer 42 The small diameter portion slides within the retainer 42.

Further, a communication hole 40b is provided in the small diameter portion of the left end of the input piston 40, and the spool 3 is passed through this communication hole 40b.
0 bottomed inner hole 35 communicates with the first oil chamber R1.

(In other words, the first oil chamber R1 and the second oil chamber R2 are connected to the communication hole 40.
They are always in communication through the b1 bottomed inner hole 35 and the communication hole 36.

) The reaction force piston 50 is fitted and fixed to the shaft center of the spool 30 through a seal member at its right end small diameter portion, and its left end large diameter portion is inserted into the small diameter inner hole 20d of the housing 20 via a seal member. The third oil chamber R3 is slidably inserted into the third oil chamber R3.

In addition, a communication hole 51 that opens to the third oil chamber R3 is provided in the axial center of the reaction force piston 50 in the axial direction, and the right end of this communication hole 51 is always shaped like an annular ring by the communication hole 39 provided in the spool 30. It communicates with the groove 27.

Next, the operation of this embodiment configured as described above will be explained. When the power steering device 11 and the hydraulic control valve device 100 are in a non-operating state and the hydraulic pump 10 is driven by the engine, the hydraulic oil is transferred to the pipe. It flows into the first port 22 through P1, passes through the throttle valve V1 which is in a fully open state, and flows out from the second port 23.

Thereafter, this hydraulic fluid flows into the power steering device 11 through the pipe P2 and returns to the reservoir 14 through the pipe P4.

button, at this time, the wheel cylinder 13 has the pipe P3, the third port 24, the annular groove 27, the normally open shutoff valve v3, the second annular groove 34, the communication hole 37, the communication hole 36, the bottomed inner hole 35, Communication hole 40b1, first oil chamber B1, fourth port 25, and pipe P
4 to the reservoir 14, the oil pressure is zero and in a non-operating state.

In this state, when the hydraulic control valve device 100 is actuated by depressing the brake pedal 12, the input piston 40 is pushed to the left via the actuation rod 43 by depressing the brake pedal 12.

As a result, the spool 30 and the reaction force piston 50 are pushed to the left via the coil spring 41 and the retainer 42 against the action of the return spring 38.

Therefore, when the spool 30 is moved, the normally open shutoff valve 3 is closed and the normally closed shutoff valve V2 is opened at the same time, and then the opening degree of the throttle valve V1 is throttled.

Therefore, the pressure of the hydraulic oil upstream of the throttle valve v1 increases, and the pressure oil passes through the first annular groove 33, the open cutoff valve v2, the annular groove 27, the third port 24, and the pipe P3 to the wheel. It is supplied to the cylinder 13 and operates the wheel cylinder 13.

At this time, the third
Since oil pressure is also applied to the oil chamber R3, the reaction force piston 50 is pushed to the right by this oil pressure.

Therefore, the driver is given a force that opposes the operating force,
The oil pressure applied to the wheel cylinder 13 and the third oil chamber R3 increases in proportion to the driver's operating force.

However, in this embodiment, since the movement stroke of the input piston 40 is defined by the nut 46, 46 and the stopper 44, the maximum throttle amount of the throttle valve V1 is set to a predetermined value, and the power steering device 11 Hydraulic pump 1
The maximum working pressure of 0 is maintained below the set value.

When the operating force on the brake pedal 12 is released, the reaction force piston 50, the spool 30, and the input piston 40 are moved to the illustrated position due to the hydraulic pressure in the third oil chamber R3 acting on the reaction force piston 50 and the action of the return spring 38. As a result, the wheel cylinder 13 communicates with the reservoir 14 in the same way as in the non-operating state described above, and enters the non-operating state.

Note that the operation of the hydraulic control valve device 100 during the operation of the power steering device 11 is substantially the same as the operation described above, except that the pressure of the hydraulic fluid upstream of the power steering device 11 increases with the operation of the power steering device 11. Since it is the same as , its explanation will be omitted.

By the way, in the hydraulic control valve device 100 that operates in this manner, when it is desired to adjust the movement stroke of the input piston 40, the right end of the boot 47 is removed from the groove formed by the nuts 46 and 46, and then moved to the left. By moving both nuts) 46 and 46 to the left or right, the movement stroke of the input piston 40 can be easily adjusted.

After adjusting the button, press the right end of the boot 47 again)4
6, 46, dust is again prevented from entering between the input piston 40 and the inner hole 21 of the housing 20.

Among the above embodiments, an example was described in which an annular groove supporting the right end of the boot 47 was formed by a pair of nuts 46° 46 having an annular protrusion 46a formed at each left end of the button. As shown in FIG. 2, an annular groove supporting the right end of the boot 47 may be formed by a pair of nuts 146 and 146 having annular protrusions 146a and 146a formed at each end thereof.

In this case, since each nut 146 has the same shape on the left and right sides, the directionality of both nuts N46, 146 is eliminated, and ease of assembly is improved.

Additionally, the boot mounting structure according to the present invention is applicable not only to the above-mentioned type of hydraulic control valve device but also to other types of hydraulic control valve devices and master cylinders.

In summary, in the button of the present invention, as exemplified in the above embodiment, one end of the button is connected to the end of the housing 20 by an annular groove formed by a pair of nuts 46 and 46 that regulate the movement stroke of the input piston 40. Since the other end of the boot 47 fitted in the hydraulic control valve device is supported, the movement stroke of the input piston can be easily adjusted and the maximum throttle amount of the throttle valve in the hydraulic control valve device can be adjusted. Of course, the boot mounting structure can be simplified.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional front view showing one embodiment of the present invention, and FIG. 2 is a sectional view of essential parts showing another embodiment of the present invention. Explanation of symbols, 12... Brake pedal, 20.
......Using, 40...Input piston, 43...Operating rod (fush rod), 46
, 46...Natsuto, 47...Boots,
Vl... Throttle valve, 100... Hydraulic control valve device.

Claims (1)

[Scope of utility model registration request] 1. A bushing rod that is activated by depression of the brake pedal is attached to the outer end of a piston that is fitted into the housing so as to be able to reciprocate in the axial direction, and the throttle valve that is incorporated in the housing is configured to act according to the movement of the piston. A pair of nuts defining the movement stroke of the piston are attached to the outer cylinder at the outer end of the piston by pressing a button on the hydraulic control valve device which causes the braking oil pressure applied to the wheel cylinder to be generated by external oil pressure. Attachment of a boot characterized in that the boot is fixed so as to be adjustable in position in the direction, one end of the boot is fixed to the outer periphery of the boot, and the other end of the boot is detachably fixed within the annular groove formed by these two nuts. structure.