JPH0632216A - Load reponse type liquid pressure control valve and fitting method therefor - Google Patents

Abstract

PURPOSE:To provide a load response type liquid pressure control valve which can be easily fitted and obtain stable liquid pressure control characteristic by forming an engaging part where one end of a set jig for regulating the fitting length of a spring is locked in a position eccentric for a length corresponding to a predetermined amount of elongation of a spring with respect to the center of rotation of a spring locking part on an oscillating lever. CONSTITUTION:A free-state spring 50, one guide 51 of which is moored by a spring locking part 30a of an oscillating lever 30, is pointed in the extending direction of the oscillating direction. In such a condition, engaging pins 22, 23 of a set jig 20 are inserted in an engagement part 30b of the oscillating lever 30 and a hole 53 of an adjusting bolt 52. At this time, the spring 50 is not energized. Subsequently, when the set jig 20 is turned in about 90-degree arc, the spring 50 is rotated according to the radius of rotation of the set jig 20, and the spring 50 is elongated. The adjusting bolt 52 provided below the spring 50 is screw-fitted as it is to an unspring member, and lastly the set jig 20 is removed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a load-responsive hydraulic control valve which adjusts the operation starting pressure of a hydraulic control valve (proportion valve) according to a change in a load and a mounting method thereof.

[0002]

2. Description of the Related Art Japanese Utility Model Publication No. 2-44603 discloses a load-responsive hydraulic control valve of this type. As shown in FIG. 4, the proportion valve (hydraulic pressure control valve) has holes formed at predetermined positions of the valve housing a and the first link member b, respectively, and both ends of the reference gauge c (set jig). The first link member b is held at a predetermined angle with respect to the housing a by engaging the respective engagement pins d provided at predetermined intervals in the first link member b and the respective holes of the housing a, Thereby, the urging force of the spring f acting on the plunger e (piston) in the proportion valve via the swing lever m can be set to a required magnitude. When mounting the above device on the vehicle, first, the housing a of the proportion valve is fixed to the vehicle body side member, and then the first link member b is rotated clockwise to extend the spring f, while the reference gauge c is adjusted. First engaging pin d
The urging force of the spring f, which is engaged with the link member b and the holes of the housing a and acts on the plunger e, is set to a required magnitude.

When the reference gauge c is further set, the loading state of the vehicle is set to a predetermined state, that is, the urging force of the spring f corresponding to the distance between the proportion valve and the axle side member g is set, and further the rod h is set in this state. While being rotatably connected to the axle side member g, the first link member b and the second link member j are integrally tightened by bolts k through the third link member i, and then the reference gauge c is connected. If removed, a predetermined urging force corresponding to the loaded state of the vehicle can be applied to the proportion valve.

[0004]

Problems to be Solved by the Invention The above-described conventional load-responsive hydraulic control valve mounting structure has the following problems.

<A> When installing the reference gauge c, the first
Since it must be performed while rotating the link member b in the clockwise direction and stretching the spring f, the work of engaging the engagement pin d with both holes of the housing a and the first link member b is very complicated.

<B> With the reference gauge c set, the rod h must be connected to the vehicle body side member g, and the second link member j and the third link member i must be fixed by the bolt k. It takes time to install.

<C> A member for locking the spring f (lever m
Since the first link member b) and the member (the first link member b and the housing a) that engages with the reference gauge c are different,
The engagement tolerances of these members accumulate, and the variation in the set load of the spring f increases.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to provide a load-responsive hydraulic control valve which is easy to install and has stable hydraulic control characteristics. It is to provide the attachment method.

[0009]

That is, according to the present invention, one end of a piston of a hydraulic control valve for reducing and outputting an input hydraulic pressure at a predetermined ratio is projected from a housing attached to a sprung member on the vehicle body side. A load-responsive type in which the protruding end of the piston is brought into contact with a swing lever pivotally supported by the housing, and a spring is stretched between the free end of the swing lever and the unsprung member on the axle side. In the hydraulic control valve, the mounting length of the spring is regulated at a position on the way of the rocking lever and eccentric by a length corresponding to the expected expansion amount of the spring with respect to the rotation center of the spring hooking portion. The load-responsive hydraulic control valve is characterized in that an engaging portion for engaging one engaging body of the setting jig is formed.

Further, according to the present invention, the hydraulic pressure control valve is attached to the sprung member on the vehicle body side, and one end of the piston of the hydraulic pressure control valve for reducing the input hydraulic pressure at a predetermined rate and outputting it is connected to the sprung member on the vehicle body side. And a protruding end of the piston is brought into contact with a swing lever pivotally supported on the housing, and a spring is provided between the free end of the swing lever and the unsprung member on the axle side. In the installation method of the load responsive hydraulic control valve using the set jig for installing the spring, set the spring to the installation length that provides the hydraulic characteristics according to the loaded load. And a free end of a spring attached to the unsprung member, a set jig including an engageable body is used, and each engageable body of the set jig is provided on the way of the swing lever. Sp A first step of attaching between an engaging portion formed at a position eccentric by a length corresponding to the expected amount of extension of the spring with respect to the center of rotation of the locking portion and the free end of the spring in a free state; And a second step of extending the spring by rotating the spring around the engaging portion of the setting jig on the lever as a rotation center, and a third step of connecting the free end of the extended spring to the unsprung member. Is a method of mounting a load responsive hydraulic control valve.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

<a> Load-responsive hydraulic control valve FIG. 1 shows a load-responsive hydraulic control valve 10 of the present invention (hereinafter referred to as "hydraulic control valve") mounted on a vehicle using a set jig 20. Indicates the status. The housing 12 of the hydraulic pressure control valve 10 has mounting holes 12a and 12b in a sprung member on the vehicle body side (not shown).
Mounted via. Housing 12 has stepped hole 12c
And an inflow chamber 12e communicating with a hydraulic pressure generation source (not shown) through a connection port 12d formed in the side portion, and an outflow chamber 12f communicating with a brake cylinder (not shown) are formed on the open side of the stepped hole 12c. Is fitted with an end plug 12g.

Piston 13 fitted in stepped hole 12c
Is a projecting end 13a projecting from the housing 12 and a large-diameter head 13b facing the outflow chamber 12f deep inside the stepped hole 12c.
And a small-diameter portion 13c formed between these two parts. The valve seal 14 attached in the stepped hole 12c is
The inflow chamber 12e and the outflow chamber 12f are defined, and the valve mechanism is configured in cooperation with the head 13b of the piston 13. The seal member 15 interposed between the small diameter portion 13c of the piston 13 and the stepped hole 12c defines the inflow chamber 12e in a liquid-tight manner. The piston 13 is moved into the outflow chamber 1 in the inflow chamber 12e.
The valve spring 16 that urges to the 2f side has the stepped hole 12
It is contracted between the retainer 17 and the piston 13 that come into contact with the end plug 12g in c. Reference numeral 18 is a bracket integrally fixed to the housing 12, and 19 is a dust boot. The basic structure and operation of the hydraulic pressure control valve 10 described above are the same as in the conventional case.

<B> Swing Lever The swing lever 30, which has a U-shaped cross section, has one end pivotally supported by a pivot pin 31 inserted through the bracket 18, and the protruding end 13a of the piston 13 is brought into contact with the intermediate portion thereof. A spring retaining portion 30a is formed at the other end. An engaging portion 30b for engaging with an engaging pin 22 of a set jig 20 described later is formed at an intermediate portion of the swing lever 30 at a predetermined distance from the spring hooking portion 30a, and further engaged. The adjusting spring 40 is located at a position near the shaft support side from the portion 30b.
An opening for inserting the adjusting rod 42 formed on one side is formed. According to the present invention, the engaging portion 30b is attached to the hooking portion 30a of the spring 50, and the spring 5 is attached.
One of the features is that it is formed at a position eccentric by the length corresponding to the extension amount of 0. Since the engaging portion 30b is for rotatably engaging with one of the engaging members of the setting jig 20, the engaging portion 30b is not limited to the hole. For example, the concave and convex engagement of the setting jig 20 may be reversed. Alternatively, a groove, various other known engaging structures, or a combination thereof can be adopted.

<C> Adjustment Spring The adjustment spring 40 is a spring for obtaining a reaction force from the housing 12 to finely adjust the urging force of the swing lever 30, and is connected to a holding bolt 41 screwed to the housing 12 at one end. Forming a U-shaped hook for the adjustment rod 42 at the other end
Are connected together. One end of the adjusting spring 40 is connected to the housing 12 via a holding bolt 41, and the other end of the adjusting spring 40 is formed by inserting an adjusting rod 42 integrally formed with the adjusting spring 40 into the swing lever 30. Is screwed in and connected. The fine adjustment of the urging force of the swing lever 30 is performed by changing the tightening position of the nut 43.

<D> Spring The spring 50 is stretched between the swing lever 30 and the unsprung member 60 on the axle side, and adjusts the urging force of the swing lever 30 against the spring force of the adjusting spring 40. It is a spring. A guide 51 made of resin is attached to one hook of the spring 50, and the other hook is integrally connected to a hole 53 of an adjusting bolt 52 that is a mounting member to the unsprung member 60.
One of the springs 50 is rotatably hooked to the spring hooking portion 30a of the swing lever 30 via the guide 51. The adjusting bolt 52 at the other end of the spring 50 is screwed to the unsprung member 60 with the nut 54 in a state where the spring 50 is extended by using the setting jig 20 as described later. The setting jig 20 is engaged between the engaging portion 30b of the swing lever 30 and the hole 53 of the adjusting bolt 52.

<E> Set jig The set jig 20 is erected so as to be detachably engaged between the engaging portion 30b of the swing lever 30 and the hole 53 (free end of the spring 50) of the adjusting bolt 52. It is a jig. As shown in FIG. 2, the setting jig 20 includes a main body 21 and a pair of engagement pins 22, 23 projecting from both ends of the main body 21 in the same direction.
And a handle 24 provided at the center of the main body 21.
One engagement pin 22 is set to have a diameter that can be inserted into the engagement portion 30b of the swing lever 30, and the other engagement pin 23 is inserted into the hole 53 of the adjustment bolt 52 without colliding with the hook of the spring 50. It has been set to a possible shape.

[0018]

Next, a method of mounting the load responsive hydraulic control valve of the present invention will be described.

<A> Mounting of hydraulic pressure control valve First, as shown in FIG.
A bolt or the like is fitted into 12b to attach the hydraulic control valve 10 to the sprung member on the vehicle body side.

<B> Setting of the setting jig Then, the free spring 50 in which one guide 51 is moored to the spring retaining portion 30a of the swing lever 30 is directed in the extension direction of the swing lever 30, and in this state. The engaging pins 22 and 23 of the setting jig 20 are inserted into the engaging portion 30b of the swing lever 30 and the hole 53 of the adjusting bolt 52. When the setting jig 20 is attached, the spring 50 is in a free state, so the biasing force of the spring 50 is
Does not work.

<C> Extension of Spring From the state where the setting jig 20 is installed on the swing lever 30 and the adjusting bolt 52, the setting jig 20 is rotated by about 90 ° as shown in FIGS. 2 to 1. . As shown in FIG. 3, the rotation center P ₁ of the setting jig 20 is eccentric to the left side of the drawing with respect to the rotation center P _{2 of the} spring 50. for that reason,
When the spring 50 is in the free state, it rotates with the turning radius r ₂ , and the adjustment bolt 5 holding the spring 50
Since the other engaging pin 23 of the setting jig 20 is locked in the second hole 53, the spring 50 is rotated according to the turning radius r ₁ of the setting jig 20, and as a result, the spring 50 is rotated. It is forcibly extended. The amount of extension of the spring 50 is determined by the amount of eccentricity of the rotation centers P ₁ and P ₂ of the members 20 and 50 on the swing lever 30 and the rotation angle of the setting jig 20. The adjusting bolt 52 under the spring 50 is screwed onto the unsprung member 60 while the spring 50 is extended by a predetermined amount using the setting jig 20. Finally, if the setting jig 20 is not removed, the load of the spring 50 acting on the piston 13 via the swing lever 30 shown in FIG.

[0022]

MODIFICATIONS In the above embodiment, the case where the other engaging pin 23 of the setting jig 20 is engaged with the hole 53 of the adjusting bolt 52 has been described, but a hook on the free end side of the spring 50 is used, or A ring body that can be engaged with the jig 20 is integrally bent and formed on a part of the free end side of the spring 50,
It is also possible to substitute for the hole 53. In short, set jig 5
It is only necessary that the other engaging member of 0 and the free end of the spring 50 are engaged with each other.

[0023]

Since the present invention is as described above, the following effects can be obtained.

<A> Since the spring can be easily extended only by rotating the set jig, the attaching and detaching operation of the spring is easy.

<B> Since the mating member to which the set jig is attached (swing lever and spring free end) and the mating member to which the spring is stretched (swing lever and spring free end) are both the same, Since there is little variation and the spring load is stable, stable hydraulic pressure control characteristics can be obtained.

<C> Since the set jig can be attached to a free spring that is not subjected to the biasing force of the spring, the set jig can be easily attached.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a state in which a load-responsive hydraulic control valve according to the present invention is attached to a vehicle.

FIG. 2 is an explanatory diagram of a load-responsive hydraulic control valve before being mounted on a vehicle.

FIG. 3 is a conceptual diagram for explaining the principle of spring extension.

FIG. 4 is an explanatory view of a conventional load responsive hydraulic control valve mounting structure.

Claims (2)

[Claims] 1. A piston of a hydraulic control valve for reducing and outputting an input hydraulic pressure at a predetermined ratio is made to protrude from a housing attached to a sprung member on the vehicle body side, and the protruding end of the piston is A load-responsive hydraulic control valve in which a spring is stretched between a free end of the rocking lever and an unsprung member on the axle side, in contact with a rocking lever pivotally supported by the housing, On the way of the lever, place one engaging body of the set jig that regulates the mounting length of the spring at a position that is eccentric by the length corresponding to the expected extension amount of the spring with respect to the rotation center of the spring hooking part. A load-responsive hydraulic control valve, which is characterized in that an engaging portion for locking is formed. 2. A hydraulic pressure control valve is attached to a sprung member on the vehicle body side, and one end of a piston of the hydraulic pressure control valve for reducing and outputting an input hydraulic pressure at a predetermined rate is attached to the sprung member on the vehicle body side. Of the piston, and the protruding end of the piston is brought into contact with a swing lever pivotally supported by the housing, and a spring is stretched between the free end of the swing lever and the unsprung member on the axle side. Then, the spring is set to the mounting length that provides the hydraulic characteristics according to the loaded load. And a free end of a spring attached to the unsprung member. A set jig having an engageable body that can be erected is used. Stop The first step of mounting between the engagement part formed at a position eccentric to the rotation center by the length corresponding to the expected amount of expansion of the spring and the free end of the spring in the free state, and the set cure on the swing lever. And a second step of extending the spring by rotating the spring with the engaging portion of the tool as a rotation center, and a third step of connecting the free end of the extended spring to the unsprung member. How to install a load-responsive hydraulic control valve.