JPS6349573A - Load response type braking hydraulic pressure control device - Google Patents

Abstract

PURPOSE:To simplify the exact establishment of the control characteristics of braking hydraulic pressure by fitting an initial length setting jig freely attachably between receiving surface parts for a member united with a braking hydraulic pressure control valve and a spring fixing member engaging the element of changing lever for control characteristics. CONSTITUTION:The above mentioned device has a braking hydraulic pressure control valve 10 fixed to a car body 14, and said valve 10 is increased in proportioning control start pressure in proportion to increase in the upward rotation of a lever 20. The lever 20 is attached to a spring fixing means comprising a tensile coil spring 24 and an adjuster screw 24 locked to the one end of said spring 24. In addition to that, an auxiliary spring 48 is provided between the lever 20 and a bracket 16. In this case, an initial length setting jig 100 having engaging pins 102, 104 which can be freely attached to a receiving surface part 50 near a locking part of a spring 48 on the bracket 16 and to a receiving surface part 52 provided on a clevis 30 respectively is provided so that it may be selectively inserted. The adjustment of the braking hydraulic pressure control valve 10 can be therefore simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a load-responsive brake hydraulic pressure control device incorporated into a hydraulic brake device used in vehicles such as automobiles.

BACKGROUND OF THE INVENTION Various types of brake fluid pressure control devices have been known that are incorporated into hydraulic brake devices of vehicles such as automobiles and perform blobbing control. A load-responsive brake fluid pressure control device configured to change fluid pressure control characteristics has already been proposed, and is disclosed in, for example, Japanese Utility Model Publication No. 49-43870;
This is shown on pages 206 to 207 of Automotive Engineering Complete Book Volume 12 (first edition published on January 20, 1980) published by Sankaido.

The load-responsive brake fluid pressure control device as described above has a lever element and is generally referred to as a load-sensing blobbing valve that changes the brake hydraulic side go characteristics according to the rotational position of the lever element. a hydraulic control valve, one end of which is locked to the lever element and the other end of which is attached to either a lower or upper part of the suspension of the vehicle, and which applies a spring force to the lever element in response to changes in vehicle load; It has a spring that changes the brake mask cylinder pressure to increase the blobbing control start pressure, that is, the brake fluid pressure that starts to keep the rear wheel cylinder fluid pressure lower than the brake mask cylinder fluid pressure, as the vehicle load increases. It has become.

Problems to be Solved by the Invention As mentioned above, in the load-responsive brake fluid pressure control device,
It is necessary to initially set the mounting length of the spring so that brake fluid pressure control characteristics corresponding to the intended vehicle load can be obtained.

In the past, this initial setting was generally done by adjusting the installation length of the spring or adjusting the brake fluid pressure so that the desired bloportioning control start pressure could be obtained when a predetermined load was loaded on the vehicle. The installation position of the control valve itself is being adjusted.

This type of initial setting method is described in the Toyota Hiace Truck Repair Manual (198
5-8), pages 8-76 to 8-79.

However, when performing initial settings using the method described above, it is necessary to actually load a specified load on the vehicle, and therefore,
Efficient and quick setup is not possible and extra equipment is required. Furthermore, in this case, it is very difficult to set the brake fluid pressure control characteristics with high precision because variations in the axle load when the vehicle is empty directly affect the vehicle body load at the time of initial setting.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, it is an object of the present invention to provide a load-responsive brake fluid pressure control device that is improved so that initial settings can be performed reliably and quickly.

Means for Solving the Problems According to the present invention, the above object is to provide a brake fluid pressure control valve that has a lever element and changes brake fluid pressure control characteristics in accordance with the rotational position of the lever element; a spring with one end locked to the lever element; and a spring with an adjuster that is connected to the other end of the spring and that is attached to either the suspended unsprung part or the suspended sprung part of the vehicle so that the installation length can be adjusted. and a mounting means, wherein the brake fluid pressure control valve or a member integral with the brake fluid pressure control valve and the spring mounting member receive an initial length setting jig that is selectively inserted between the two. This is achieved by a load-responsive brake fluid pressure control device characterized by having a receiving surface.

Effects and Effects of the Invention According to the configuration as described above, the initial length setting jig is provided between the receiving surface portions of the brake fluid pressure control valve or a member integrated with the brake fluid pressure control valve and the spring mounting member. By being inserted into the spring, the initial length of the spring is set, and the initial setting of the spring strength of the spring is ensured without increasing the vehicle load in the empty state and without being affected by the jig type. Brake fluid pressure control characteristics can now be set with high accuracy and ease of use.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail by way of embodiments with reference to the accompanying drawings.

1 to 3 show one embodiment of a load-responsive brake fluid pressure control device according to the present invention.

In these figures, numeral 10 indicates a brake fluid pressure control valve, and the brake fluid pressure control valve 10 is attached by bolts 12 to a valve bracket 16 fixed to the vehicle underbody 14, which is a suspended sprung portion, by bolts 18. It is installed in a fixed state. That is, the brake fluid pressure control valve 10 is fixed to the vehicle underbody 14 by a valve bracket 16. The brake fluid pressure control valve 10 is a well-known load sensing blotting valve, and the lever 2
0, and the lever 20 is supported by the brake fluid pressure control valve 10 at one end (not shown) covered by a dust boot 22 so as to be rotatable in the vertical direction in the figure, and the amount of upward rotation is In response to an increase in the pressure, the pressure at which the bropo-sizing control starts (the liquid pressure at the break point) is increased.

One hook 26 of a tension coil spring 24 is latched near the tip of the lever 20 . Tension coil spring 24
The other hook 28 is latched to a clevis bin 32 consisting of a bolt and nut attached to a clevis 30. One end of an adjustment screw 34 is fixed to the clevis 30. The adjustment screw 34 extends in the axial direction of the tension coil spring 24, and is attached to a bolt through hole 4 of a lower arm bracket 42 fixed to a lower arm 40, which is the lower part of the suspension spring, by appropriate means such as welding.
The lower arm bracket 42 is fixed to the lower arm bracket 42 in an adjustable manner by tightening nuts 36 and 38 which are inserted through the lower arm bracket 4 and sandwich the lower arm bracket 42 and are screwed on both sides thereof. In addition, in Figures 1 and 2,
The nut 38 is shown not yet fully tightened.

A rotation prevention piece 46 that engages with one outer wall of the lower arm bracket 38 to prevent rotation of the clevis 30 is fixed to the clevis 33 by appropriate means such as welding.

Further, an auxiliary tension coil spring 48 that acts as a bias spring is stretched between the lever 20 and the valve bracket 16.

An engagement pin 102 of an initial length setting jig 100 is located near the locking portion of the auxiliary tension coil spring 48 of the valve bracket 16.
A groove-shaped receiving surface portion 50 is provided for receiving the. Further, the clevis 30 is provided with a receiving surface portion 52 that receives the engagement pin 104 of the initial length setting jig 100. The receiving surfaces 50 and 52 are opposed to each other, and the initial length setting jig 100 is selectively inserted between them.

Next, the assembly and initial setting procedure of the load-responsive brake fluid pressure control device constructed as described above will be explained.

During this assembly, the brake fluid pressure control valve 10 and the valve bracket 16 are fixedly connected in advance by bolts 12, and a tension coil spring 24 is stretched between the lever 20 and the clevis 30. An auxiliary tension coil spring 48 is suspended between the bracket 16 and the bracket 16 . First, the valve bracket 16 is fixed to the vehicle underbody 14 using bolts 18 . Next, with the tire set on the road surface in an empty state, the adjustment screw 34 is passed through the bolt hole 44 of the lower arm bracket 42 while pulling the clevis 30 downward.
In this state, the initial length setting jig 100 is inserted between the valve bracket 16 and the crivis 30. In this case, the nut 36 is attached to the lower arm bracket 4.
Adjust screw 3 in advance so that it is located above 2.
4 is fully screwed in. Also, at this time, as shown in FIGS. 1 and 2, the adjustment screw 34
A nut 38 is temporarily tightened at the tip of the nut 38.

The engagement pin 102 of the initial length setting jig 100 engages with the receiving surface portion 50 of the valve bracket 16, and the engagement pin 104
When the clevis 30 is engaged with the receiving surface portion 52 of the clevis 30, the clevis 30 that has been pulled downward is released. When the clevis 30 is released, the tension coil spring 24
The clevis 30 is raised by the spring force of the auxiliary tension coil spring 48, and this spring force causes the initial length setting jig 1 to rise.
00 is the receiving surface portion 50 of the valve bracket 16 and the receiving surface portion 52 of the clevis 30 with the engaging pins 102 and 104.
The initial lengths of the tension coil spring 24 and the auxiliary tension coil spring 48 are set.

That is, the distance between the receiving surfaces 50 and 52 is set to a predetermined value by the initial length setting jig 100.

Under the conditions described above, turn the nut 36 to move it to a position where it lightly contacts the top surface of the lower arm bracket 42, then turn the nut 38 until it touches the bottom surface of the lower arm bracket 42 lightly. Moving is performed.

Once the nuts 36 and 38 have been temporarily tightened as described above, the initial length setting jig 100 is attached to the valve bracket 16.
and clevis 30, and fully tighten the nut 38 to complete the work. When the nut 38 is screwed in, the beam screw 30 is prevented from rotating relative to the lower arm bracket 42 by the rotation stopper piece 46, so that the tension coil spring 42 is prevented from being screwed in at this time, and the clevis 30 itself is also prevented from rotating. Since it does not rotate, the nut 36 also does not rotate, and the initial length setting jig 100
The effective lengths of the tension coil spring 24 and the auxiliary tension coil spring 48 determined by the above do not change when the nut 38 is tightened.

By assembling and initializing the load-responsive brake fluid pressure control device in the manner described above, the initial length of the tension coil spring 24 and the auxiliary tension coil spring 48 determined by the initial length setting jig 1'00 is The brake fluid pressure control valve 10 and valve bracket 16 are installed before assembly to the vehicle body so that the desired brake fluid pressure control characteristics can be obtained at the effective length.
In addition to the fact that the mounting position relative to the vehicle is adjusted in advance, the brake fluid pressure control characteristics can be set with high accuracy in an empty vehicle state without applying a predetermined load to the vehicle. becomes possible.

Although the present invention has been described in detail with respect to specific embodiments above, the present invention is not limited thereto.
It will be apparent to those skilled in the art that various embodiments are possible within the scope of the invention.

[Brief explanation of the drawing]

FIG. 1 is a front view showing one embodiment of the load-responsive brake fluid pressure control device according to the present invention, and FIG. 2 is a side view of the load-responsive brake fluid pressure control device according to the present invention shown in FIG. 3 is a perspective view showing the assembly process of the load-responsive brake fluid pressure control device according to the present invention shown in FIGS. 1 and 2. 10... Brake fluid pressure control valve, 12... Bolt, 1
4...Vehicle underbody, 16...Valve bracket. 18...Bolt, 20...Lever, 22...Dust boot, 24...Tension coil spring, 26.28...
·hook. 30... clevis, 32... clevis bin, 34.
... Adjustment screw, 36.38 ... Nut, 4
0... Lower arm, 42... Lower arm bracket, 44... Bolt through hole, 46... Rotation stopper piece, 4
8... Auxiliary tension coil spring, 50.52... Receiving surface part, 100... Initial length setting jig, 102.104
... Engaging Bin Patent Applicant Toyota Motor Corporation Aisin Seiki Co., Ltd. Representative Patent Attorney Masatake Akashi Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] A brake fluid pressure control valve having a lever element and changing brake fluid pressure control characteristics according to a rotational position of the lever element, a spring having one end locked to the lever element, and a spring connected to the other end of the spring. and a spring mounting means with an adjuster for attaching the other end to either a suspended unsprung part or a suspended unsprung part of a vehicle so that the mounting length can be adjusted, and the brake fluid pressure control valve A load-responsive brake fluid pressure control device, characterized in that the integral member and the spring mounting member are provided with a receiving surface portion that receives an initial length setting jig that is selectively inserted between the two members.