JPH0558411U - Hydraulic equalizer - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a lightweight equalizer with less restrictions on vertical stroke in a tandem axle. [Composition] Hydraulic cylinders 6 and 7 for receiving a vertical load from the road surface are provided between the front-rear shaft 1 and the front-rear shaft 2 of the front two-axle vehicle and the side rails 5, and these hydraulic chambers are connected by a pipe 16. The pipe 16 and the reservoir 17 are communicated with each other through the orifice.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to an equalizer for a tandem axle in a truck or the like.

[0002]

[Prior Art]

 In tandem axles such as trucks, a link-type equalizer has been conventionally provided to prevent uneven vertical loads on both axles due to unevenness on the road surface, resulting in poor riding comfort and spring strength problems. However, in this case, it is unavoidable that the stroke of the link has a mechanical upper limit and that a load such as an increase in load due to the installation of a link with high strength is accompanied.

[0003]

[Problems to be solved by the device]

 The present invention seeks to provide a lightweight equalizer with less restriction on vertical stroke.

[0004]

[Means for Solving the Problems]

 For this reason, the hydraulic equalizer according to the present invention is installed on both axles of the tandem axle, and is equipped with hydraulic cylinders that receive vertical loads from the above-mentioned axles, respectively, and a flow path that connects the hydraulic chambers of the hydraulic cylinders. It has a reservoir that communicates with the same channel via an orifice.

[0005]

[Action]

 That is, when vertical load is applied to one of the hydraulic cylinders installed on both axles from the axle, the hydraulic pressure generated in that hydraulic chamber is transmitted to the hydraulic chamber of the other hydraulic cylinder through the flow path. As a result, the vertical load on both axles is made uniform.

[0006]

【Example】

 Hereinafter, embodiments of the present invention shown in the drawings will be specifically described. In FIG. 1, the left-right front-rear shaft 1 and the front-rear shaft 2 of the front two-axle vehicle are connected to the side rails 5 via leaf springs 3 and 4, respectively, and their upper ends are hydraulically supported by the side rails 5, respectively. The lower ends of the cylinders 6 and 7 are pivotally supported by the front-rear shaft 1 and the front-rear shaft 2, respectively. As shown in detail in FIG. 2, both hydraulic cylinders 6 and 7 have pistons 8 and 9 whose lower ends are connected to the front-rear shaft 1 and the front-rear shaft 2, respectively, and air chambers 10 and 11 above them. The hydraulic chambers 14 and 15 are separated from the air chambers 10 and 11 by the free pistons 12 and 13, and the hydraulic chambers 14 and 15 are connected by a pipe 16.

The reservoir 17 fixed to the side rail 5 communicates with the middle of the pipe 16 through the orifice 18, and supplies oil 20 to both the hydraulic chambers 14 and 15 and the pipe 16 to fill them with oil 20. In addition, the air space 21 is formed in the upper part, and the vertical movement of the front-rear shaft 1 and the front-rear shaft 2 with respect to the side rails 5 during the empty time and the loaded time is expanded and contracted by the expansion and contraction of the air space 21. I try to absorb it. The orifice 18 or its vicinity receives a roll signal from a device (not shown) that detects rolling of the vehicle from the steering wheel angle, vehicle speed, load capacity, etc., and closes when the vehicle rolls. There is a solenoid valve (not shown) that shuts off the valve.

In the above vehicle, minute vibrations transmitted from the road surface to the hydraulic cylinders 6 and 7 from the road surface through the front-rear shaft 1 and the front-rear shaft 2 are absorbed by the air in the air chambers 10 and 11, respectively. When a large vertical load is applied to one of the front-rear shaft 1 and the front-rear shaft 2 due to, for example, the piston 8 or 9 of one hydraulic cylinder 6 or 7, the air chamber 10 or 11, and the free piston 12 or 13 A high pressure is generated in one of the hydraulic chambers 14 or 15 through the flow path, and this high pressure is transmitted to the other hydraulic chamber 14 or 15 through the pipe 16 without escaping to the reservoir 17 due to the presence of the orifice 18. ..

Therefore, the vertical loads applied to the side rails 5 from the front-rear shaft 1 and the front-rear shaft 2 are almost equalized, and moreover, the resistance in the pipe 16 also has a damping characteristic. Therefore, it is possible to easily suppress the deterioration of the riding comfort of the vehicle and the overload of the leaf springs 3 and 4. Further, with respect to rolling of the vehicle, the pipe 16 and the reservoir 17 are shut off by closing the solenoid valve, and the rigidity of both hydraulic cylinders 6 and 7 is increased. Can also act as a stabilizer when rolling the vehicle.

Further, the vertical movements of the front-rear shaft 1 and the front-rear shaft 2 with respect to the side rail 5 between when the vehicle is empty and when the vehicle is loaded are absorbed in the air space 21 of the reservoir 17, so that the hydraulic cylinders 6 and 7 operate. Therefore, the vertical strokes of the front-rear shaft 1 and the front-rear shaft 2 are not restricted by the hydraulic cylinders 6 and 7. Further, the above-mentioned device is composed of the hydraulic cylinders 6 and 7, the pipe 16, the reservoir 17 and the orifice 18, and has an advantage that it is small and lightweight and easy to assemble.

Although the above embodiment relates to a front two-axle vehicle, it can be similarly applied to a rear two-axle vehicle, and a liquid other than oil can be appropriately used as a working fluid for both cylinders. Needless to say, a compression spring can be housed in the air chamber of the device to speed up hydraulic operation and reduce the size of the device.

[0012]

[Effect of the device]

 The hydraulic equalizer according to the present invention can easily suppress the uneven distribution of the vertical load on both axles by connecting hydraulic cylinders installed on both axles of the tandem axle with the flow passages. In addition, since there are few restrictions on the vertical stroke and it is small and lightweight, it can be easily applied to a wide range of vehicles.

[Brief description of drawings]

FIG. 1 is a side view of an embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view of a main part of the above embodiment.

[Explanation of symbols]

 1 Front-to-front axis 2 Front-rear axis 3 Leaf spring 4 Leaf spring 6 Hydraulic cylinder 7 Hydraulic cylinder 14 Hydraulic chamber 15 Hydraulic chamber 16 Pipe 17 Reservoir 18 Orifice 20 Oil 21 Air space

Claims (1)

[Scope of utility model registration request] 1. A hydraulic cylinder that is installed on both axles of a tandem axle and receives a vertical load from each axle, a flow passage that communicates the hydraulic chambers of both hydraulic cylinders, and a fluid passage that communicates with the same passage via an orifice. Hydraulic equalizer with a reservoir.