JPH0634197Y2 - Load-responsive hydraulic control valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a load-responsive hydraulic control valve, for example, a load-responsive hydraulic control valve that controls the brake hydraulic pressure of the rear wheels of a vehicle in accordance with the vehicle load. Regarding the pressure control valve.

(Prior Art) Generally, in order to prevent early locking of the rear wheels during vehicle braking, the brake fluid pressure of the rear wheels is controlled to be reduced. Also, if the vehicle weight changes significantly depending on the loading condition of the vehicle,
The brake fluid pressure is controlled according to the vehicle load. A load sensing valve is a load-responsive hydraulic pressure control valve that controls this type of brake hydraulic pressure according to the load.

A conventional load sensing valve is shown in FIG. In FIG. 4, reference numeral 1 is a load sensing valve, and the load sensing valve 1 is fixed to a frame 2 of a vehicle with bolts to control the hydraulic pressure from the master cylinder and transmit it to the rear wheel cylinder. And a rod-shaped elastic member 5 that applies a pressing force F corresponding to the vehicle load to the hydraulic pressure control valve 3.
The elastic member 5 includes a housing 3A and a housing 3A for the hydraulic control valve 3 in the frame 2 whose one end 5a is on the spring side of the vehicle.
Is attached via a bracket 6 having a U-shaped cross section fixed to the other end, and the other end 5b is attached via a connecting means 8 to a wheel support mechanism 7 which is the under spring side of the vehicle. The bracket 6 pivotally supports the one end 5a of the elastic member 5 and the housing 3A through the hole in which the plug 10 is provided in the bracket 6.
It is fixed to the housing 3A by being screwed in. The piston 12 is fitted in the shaft hole 10a of the plug 10 and the shaft hole 3a of the housing 3A, and the end of the piston 12 projects toward the plug 10 side and abuts on the elastic member 5. A pressing force F corresponding to the load is applied to the piston 12 by the elastic member 5 to control the hydraulic pressure corresponding to the load.

In order to accurately apply the pressing force F corresponding to the loaded load to the piston 12 by the elastic member 5, the elastic member 5 is designed so that when the vehicle is displaced relative to the sprung and unsprung relative to each other,
It is necessary to position them so that they are in a constant position with respect to. Conventional load sensing valve 1 has piston 12
A guide 13 having a U-shaped cross section is directly attached to the end of the elastic member 5 so that the position of the elastic member 5 with respect to the piston 12 is restricted.

(Problems to be solved by the invention) However, the elastic member 5 is displaced in the vertical direction due to the relative displacement between the sprung and unsprung portions of the vehicle, and a slight lateral displacement that causes an error, that is, a displacement with respect to the piston 12 occurs. I have something to do. The lateral displacement of the elastic member 5 exerts a lateral force, so-called bending, on the piston 12 via the guide 13, which causes a problem that the hydraulic pressure control valve 3 has a characteristic defect.

Therefore, the present invention provides an elastic member by providing a guide body that guides the moving direction of the other end of the elastic member to the other end of the bracket to which the one end of the elastic member is attached. Provided is a load-responsive hydraulic control valve that restricts the moving direction of a member to only a vertical displacement and applies an accurate pressing force F corresponding to this relative displacement to a piston with high accuracy to enable highly accurate decompression control. The purpose is to

(Means for Solving the Problems) The present invention is directed to a hydraulic pressure control valve for controlling the hydraulic pressure from a master cylinder and transmitting it to a rear wheel cylinder, a bracket connected to a housing of the hydraulic pressure control valve, and one end portion. Is attached to one end of the bracket on the upper side of the spring of the vehicle, and the other end is attached to the lower side of the spring of the vehicle to convert the relative displacement between the sprung and unsprung into a pressing force. In a load-responsive hydraulic pressure control valve including a rod-shaped elastic member added to the hydraulic pressure control valve, a guide body fixed to the other end of the bracket and guiding the moving direction of the other end of the elastic member. It is characterized by the provision of.

Here, it is preferable that the guide body is made of plastic and the peripheral portion is fixed to the bracket and the central guide portion guides the outer peripheral portion of the elastic member.

Further, the guide body may be formed integrally with the bracket.

(Operation) In the load-responsive hydraulic control valve according to the present invention, the guide member for guiding the moving direction of the other end of the elastic member is fixed to the other end of the bracket. The movement direction is regulated so as to be only the vertical displacement corresponding to the load of the vehicle, and the horizontal displacement that causes an error does not occur. This restriction works more effectively because the mounting positions of the bracket, the guide body, and the elastic member are provided at both ends of the bracket that are separated from each other. Therefore, when the elastic member moves due to the relative displacement between the sprung part and the unsprung part of the vehicle, the elastic member applies an accurate pressing force corresponding to this relative displacement to the hydraulic control valve to reduce the hydraulic pressure with high accuracy. Control is made.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

1 to 3 are views showing an embodiment of a load-responsive hydraulic control valve according to the present invention.

First, the configuration will be described. 21 in FIGS.
Is a load-responsive hydraulic control valve, and load-responsive hydraulic control valve
Reference numeral 21 denotes a hydraulic pressure control valve 23 fixed to a vehicle frame 22 by a bolt (not shown) to control the hydraulic pressure from the master cylinder and transmitting it to the rear wheel cylinder, and a hydraulic pressure control valve 23 made of spring steel for loading the vehicle. It has a rod-shaped elastic member 25 for applying a pressing force F corresponding to the load. The elastic member 25 is
One end 25a is attached to the frame 22 which is the spring upper side of the vehicle via the housing 23A of the hydraulic control valve 23 and a bracket 26 having a U-shaped cross section which is a mounting member, and the other end 25b is the spring lower side of the vehicle. It is attached to a wheel support mechanism 27 via a connecting means 28. The elastic member 25 converts the loading load of the vehicle into a relative displacement between the frame 22 on the spring and the support mechanism 27 under the spring, and the pressing force F corresponding to this relative displacement is generated near the one end 25a of the elastic member 25. It is adapted to be added to the protrusion 30a of the piston 30 protruding from the hydraulic pressure control valve 23.
The piston 30 is provided with a stepped shaft hole 23a in the housing 23A and a shaft hole 31a of a plug 31 screwed into the opening of the housing 23A.
It is slidably supported inside.

As shown in FIG. 2, the bracket 26 rotatably supports one end 25a of the elastic member 25 with a packing and a bolt nut, and is fixed to the housing 23A of the hydraulic control valve 23 with a screw by a plug 31. There is. Also, the bracket 26
Has an opening (no reference numeral) having a diameter larger than the diameter of the elastic member 25 at the other end 26b.

In FIGS. 2 and 3, reference numeral 33 denotes a guide body, and the guide body 33 is made of plastic, and one end portion 26a on one side of the bracket 26 to which one end portion 25a of the elastic member 25 is attached to the other end portion 25b of the elastic member 25. End 26b on the other side of the bracket 26
It is mounted so as to be fixed and fixed in the opening of the. The guide body 33 has a guide portion 33a, which is cut out in the center in the vertical direction, that is, in the axial direction of the piston 30, and the displacement of the elastic member 25 on the other end side is restricted only to the displacement in the vertical direction. There is. In addition, the guide body 33 is a bracket around
The engaging portion 33b engages with the end portion 26b on the other side of 26, and is fixed to the end portion 26b on the other side. Therefore, the elastic member 25
When the vehicle moves due to the relative displacement between the sprung and unsprung portions of the vehicle, the other end 25b side of the elastic member 25 is only displaced in the vertical direction by the guide body 33, and the accurate pressing force F corresponding to this displacement is hydraulically controlled. The protrusion 30a of the piston 30 of the valve 23 is accurately added.

Reference numeral 35 is a rubber cover, and the rubber cover 35 covers the outside of the bracket 26 to which the one end 25a of the elastic member 25 is attached, and is fixed to the housing 23A by the clamp pin 36 in the vicinity of the opening of the hydraulic control valve 23. .

Next, the operation will be described.

The load-responsive hydraulic control valve according to the present invention is provided with a sufficiently large opening at the other end 26b of the bracket 26, and a guide body for guiding the other end 25b side of the elastic member 25 into the opening. Since 33 is fixed as a separate body, elastic member
The movement direction of 25 is restricted only to the vertical displacement in accordance with the load of the vehicle, and the lateral displacement does not occur. In addition, the guide body 33 and one end 25a of the elastic member 25 and the bracket 26
This restriction is more effective because the mounting of the brackets is provided at both ends of the bracket 26 with the protrusion 30a at the center, and the accurate pressing corresponding to the relative displacement between the sprung and unsprung parts is performed. The force F is accurately applied to the projection 30a of the piston 30 by the elastic member 25, and the hydraulic pressure control valve 23 is accurately controlled to reduce the pressure. By the way, in the present embodiment, since the guide body 33 is installed in the opening of the bracket 26 that is sufficiently larger than the diameter of the elastic member 25, the assembly of the elastic member 25 into the bracket 26 becomes easy, and the elastic member 25 You can certainly guide. In addition, the material of the guide body 33 can be arbitrarily selected to improve moldability and durability,
It can be made preferable in terms of guide performance and the like.

(Effect) As described above, according to the present invention, a large opening is provided at one end of the bracket to which one end of the elastic member is attached and the other end is provided with the elastic member. Since the guide body for guiding the other end of the guide in the predetermined moving direction is provided as a separate body, the elastic member can be easily assembled to the bracket and the guide action of the guide body is effectively enhanced. be able to. Therefore, the moving direction of the elastic member is restricted only to the vertical displacement, and the accurate pressing force F corresponding to this relative displacement is applied to the piston with high accuracy, and highly accurate decompression control can be performed.

[Brief description of drawings]

1 to 3 are views showing an embodiment of a load-responsive hydraulic control valve according to the present invention. FIG. 1 is an overall schematic front view including a partial cross section thereof, and FIG. FIG. 3 and FIG. 3 are side views of the main part. FIGS. 4 and 5 are views showing a conventional load-responsive hydraulic control valve, FIG. 4 is an overall schematic front view including a partial cross section thereof, and FIG. 5 is a cross section taken along line VV of FIG. It is a figure. 21 …… Load-responsive hydraulic control valve, 23 …… Hydraulic control valve, 23A …… Housing, 25 …… Elastic member, 26 …… Bracket (upper spring side), 27… Support mechanism (lower spring side), 33 ... Information guide.

Claims (1)

[Scope of utility model registration request] 1. A hydraulic pressure control valve for controlling hydraulic pressure from a master cylinder to transmit the hydraulic pressure to a rear wheel cylinder, a bracket connected to a housing of the hydraulic pressure control valve, and one end portion of a bracket on a spring side of a vehicle. It is attached to one end and the other end is attached to the unsprung side of the vehicle. It converts the relative displacement between the sprung and unsprung into pressing force, and applies the pressing force to the hydraulic control valve. In a load-responsive hydraulic control valve including an elastic member, an opening having a diameter larger than the diameter of the elastic member is provided at the other end of the bracket,
A load-responsive hydraulic control valve, wherein a guide body for guiding the other end of the elastic member in a predetermined moving direction is provided in the opening.