Steering gear stroke unloading valve

Abstract

The invention relates to a steering gear stroke unloading valve which comprises a steering gear body. The steering gear body comprises a steering gear upper cavity, a steering gear piston and a steering gear lower cavity. The whole valve body is arranged on the steering gear piston, and the two ends of the valve body are in sliding connection with the steering gear upper cavity and the steering gear lower cavity respectively. The two adjusting screws are at least partially arranged in the steering gear upper cavity and the steering gear lower cavity and are in contact connection with the two ends of the valve body. The device has an automatic adjusting function and a manual adjusting function at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive mechanical hydraulics, and particularly to a steering gear stroke unloading valve. Background Art

[0002] At present, there are two structures of the steering gear stroke unloading valve used in trucks, which are divided into manual adjustment and automatic adjustment. After the vehicle rolls off the production line and the wheels leave the ground, when turning the steering wheel to the limit of the left and right wheel limit screws, the automatic adjustment stroke unloading valve is automatically adjusted in place, without the need for manual adjustment of the steering gear stroke unloading valve, with high efficiency. However, once the wheels are on the ground and carrying a load, due to stiffness losses in various systems such as the steering suspension frame, the stroke unloading valve releases pressure prematurely, the wheel angle cannot reach the maximum, and the vehicle turning diameter cannot reach the minimum. For the manual adjustment stroke unloading valve, after the vehicle rolls off the production line, it is necessary to manually adjust the steering gear stroke unloading valve. Contrary to the automatic stroke unloading valve, its advantage is that it can be adjusted when the front wheels are carrying a load, and the wheel angle can reach the maximum, but the disadvantage is low efficiency. Summary of the Invention

[0003] The purpose of the present invention is to provide a steering gear stroke unloading valve in view of the deficiencies of the prior art, which solves the problems that the wheel angle of the automatic stroke unloading valve cannot reach the maximum and the manual adjustment of the stroke unloading valve has low efficiency.

[0004] The present invention is implemented by adopting the following technical solutions:

[0005] A steering gear stroke unloading valve, comprising:

[0006] A steering gear body, including a steering gear upper cavity, a steering gear piston, and a steering gear lower cavity;

[0007] A valve body, which is integrally arranged on the steering gear piston and is slidably connected to the steering gear upper cavity and the steering gear lower cavity at both ends respectively;

[0008] Adjusting screws, two in number, at least partially arranged in the steering gear upper cavity and the steering gear lower cavity, and in contact connection with both ends of the valve body.

[0009] As a further description of the invention, the valve body includes a sleeve, a valve sleeve, a valve core, and a spring;

[0010] One end of each of the two valve cores facing each other is respectively arranged inside the inner circles of both ends of the spring, and the other end of each of the two valve cores facing away from each other is respectively arranged in the inner holes of the two valve sleeves and is integrally arranged in the inner hole of the sleeve.

[0011] As a further description of the invention, the valve body further includes a sleeve base and a sleeve end cap;

[0012] The sleeve base and the sleeve end cover are respectively sleeved on two valve sleeves. Grooves are respectively arranged on the outer cylindrical surfaces of the sleeve base and the sleeve end cover, and sealing rings are arranged in the grooves and are arranged in the inner hole of the sleeve.

[0013] As a further description of the invention, the whole valve body is installed into the steering gear piston. One side of the sleeve base is hermetically connected with one end of the steering gear piston by the sealing ring thereon, and one side of the sleeve end cover is threadedly connected with the other end of the steering gear piston.

[0014] As a further description of the invention, the steering gear body adopts a recirculating ball type steering gear, and the steering gear body further includes a steering gear housing and a steering gear end cover;

[0015] The steering gear end cover is arranged outside the top of the steering gear housing, and a steering gear input shaft is arranged inside the top of the steering gear housing. The two adjusting screws are arranged inside the steering gear housing, and the opposite ends are respectively in contact connection with the two valve cores.

[0016] As a further description of the invention, plugs are respectively arranged at the steering gear input shaft and the bottom of the steering gear housing, and the plugs are arranged outside the adjusting screws.

[0017] As a further description of the invention, an interference fit is adopted between the valve sleeve and the sleeve, and the cylindrical steps of the valve sleeve and the sleeve are flush.

[0018] Compared with the prior art, the invention has the following beneficial technical effects:

[0019] On the basis of the existing recirculating ball type steering gear, the invention adds a valve body to play the role of a pressure relief valve, and then adds adjusting screws on this basis to play the role of overall limiting of the valve body on the steering gear piston, and at the same time has an automatic adjustment function and a manual adjustment function. When efficiency is the main consideration and the wheel angle is appropriately sacrificed, the automatic adjustment function is selected; when some vehicles or all vehicles pursue the maximum wheel angle, first adjust the automatic adjustment function part, and then make a fine adjustment to the manual adjustment function part. Also, if the automatic adjustment function of the steering gear stroke pressure relief valve is over-adjusted and cannot be adjusted reversely, it can be compensated by the manual adjustment function. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of the external structure of the steering gear provided by an embodiment of the invention;

[0021] Figure 2 is Figure 1 the A-A cross-sectional view of

[0022] Figure 3 is Figure 2 the partial enlarged view of

[0023] In the figure, 1 is a plug; 2 is an adjusting screw; 3 is a sleeve base; 4 is a sealing ring; 5 is a sleeve; 6 is a valve sleeve; 7 is a valve core; 8 is a spring; 9 is a sleeve end cover; 10 is a steering gear input shaft; 11 is a steering gear housing; 12 is a steering gear end cover; 13 is an upper cavity of the steering gear; 14 is a steering gear piston; 15 is a lower cavity of the steering gear. Detailed implementation manners

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0025] The implementation manner of the present invention is as Figures 1-3 shown. A steering gear stroke unloading valve includes:

[0026] A steering gear body, including an upper cavity 13 of the steering gear, a steering gear piston 14, and a lower cavity 15 of the steering gear;

[0027] A valve body, which is integrally arranged on the steering gear piston 14 and is slidably connected to the upper cavity 13 of the steering gear and the lower cavity 15 of the steering gear at both ends respectively;

[0028] There are two adjusting screws 2, at least part of which are arranged in the upper cavity 13 of the steering gear and the lower cavity 15 of the steering gear, and are in contact connection with both ends of the valve body.

[0029] As Figure 3 shown, the valve body includes a sleeve 5, a valve sleeve 6, a valve core 7, and a spring 8;

[0030] One end of the two valve cores 7 facing each other is respectively arranged inside the inner circles at both ends of the spring 8, and the other end of the two valve cores 7 facing away from each other is respectively arranged in the inner holes of the two valve sleeves 6 and is integrally arranged in the inner hole of the sleeve 5; the two valve cores 7 are elastically pressed against each other by the spring 8.

[0031] As Figure 3 shown, the valve body further includes a sleeve base 3 and a sleeve end cover 9;

[0032] The sleeve base 3 and the sleeve end cover 9 are respectively sleeved on the two valve sleeves 6. Grooves are respectively arranged on the outer cylindrical surfaces of the sleeve base 3 and the sleeve end cover 9, and sealing rings 4 are arranged in the grooves and are arranged in the inner hole of the sleeve 5 to play a sealing role.

[0033] Furthermore, there is an interference fit between the valve sleeve 6 and the sleeve 5, and the cylindrical steps of the valve sleeve 6 and the sleeve 5 are flush.

[0034] As Figure 2 、 3As shown in the figure, the above valve body structure is encapsulated as a whole. The whole valve body is installed in the steering gear piston 14. One side of the sleeve base 3 is hermetically connected to one end of the steering gear piston 14 by the sealing ring 4 thereon, and one side of the sleeve end cover 9 is threadedly connected to the other end of the steering gear piston 14, playing a role in integrally connecting the valve body and the steering gear body.

[0035] As Figure 2 shown, the steering gear body adopts a recirculating ball steering gear, and the steering gear body further includes a steering gear housing 11 and a steering gear end cover 12.

[0036] The steering gear end cover 12 is arranged outside the top of the steering gear housing 11, and a steering gear input shaft 10 is arranged inside the top of the steering gear housing 11. Two adjusting screws 2 are arranged inside the steering gear housing 11, and the opposite ends are respectively in contact connection with the two valve cores 7. On the basis of the existing recirculating ball steering gear, a valve body is added to play the role of a pressure relief valve, and then an adjusting screw 2 is added on this basis to play the role of overall limiting of the valve body on the steering gear piston 14.

[0037] As Figure 1 、 2 shown, plugs 1 are respectively arranged at the bottom of the steering gear input shaft 10 and the steering gear housing 11. The plugs 1 are arranged outside the adjusting screws 2 to play a sealing role.

[0038] The above steering gear stroke pressure relief valve has an automatic adjustment function and a manual adjustment function, and the working principle is as follows:

[0039] Automatic adjustment function of the steering gear stroke pressure relief valve: Start the recirculating ball steering gear, rotate the steering gear input shaft 10, drive the steering gear piston 14 to drive the whole valve body to move to one side until the valve core 7 contacts the adjusting screw 2 on the steering gear housing 11 or the adjusting screw 2 on the steering gear end cover 12. The end of the valve core 7 exposed from the valve sleeve 6 is compressed, and the steering gear piston 14 continues to move. The valve sleeve 6 drives the valve core 7 to be pressed into the sleeve 5. Relatively, when the steering gear input shaft 10 rotates in the other direction, the principle is the same and will not be elaborated one by one, realizing the automatic adjustment function.

[0040] Manual adjustment function of the steering gear stroke pressure relief valve: After completing the automatic adjustment function of the steering gear stroke pressure relief valve, the position can be adjusted by rotating the adjusting screw 2 to change the overall limit of the valve body, realizing the manual adjustment function.

[0041] In summary, the steering gear stroke pressure relief valve of the present invention has both an automatic adjustment function and a manual adjustment function, and has the following advantages:

[0042] When efficiency is the main consideration and the wheel angle is sacrificed appropriately, select the automatic adjustment function; when some or all vehicles pursue the maximum wheel angle, first adjust the automatic adjustment function part, and then make fine adjustments to the manual adjustment function part. Also, if the automatic adjustment function of the steering gear stroke unloading valve is over-adjusted and cannot be adjusted reversely, it can be compensated by the manual adjustment function.

[0043] It should be noted that in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device.

[0044] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A steering gear stroke unloading valve, characterized in that, Comprising: A steering gear body, including an upper steering gear cavity (13), a steering gear piston (14), and a lower steering gear cavity (15); A valve body, which is integrally disposed on the steering gear piston (14) and is slidably connected to the upper steering gear cavity (13) and the lower steering gear cavity (15) at both ends respectively; Adjusting screws (2), with a quantity of two, at least partially disposed in the upper steering gear cavity (13) and the lower steering gear cavity (15), and in contact connection with both ends of the valve body.

2. The steering gear stroke unloading valve according to claim 1, characterized in that, The valve body includes a sleeve (5), a valve sleeve (6), a valve core (7), and a spring (8); One end of the two valve cores (7) facing each other is respectively disposed inside the inner circles at both ends of the spring (8), and the other end of the two valve cores (7) facing away from each other is respectively disposed in the inner holes of the two valve sleeves (6) and is integrally disposed in the inner hole of the sleeve (5).

3. The steering gear stroke unloading valve according to claim 2, characterized in that, The valve body further includes a sleeve base (3) and a sleeve end cover (9); The sleeve base (3) and the sleeve end cover (9) are respectively sleeved on the two valve sleeves (6). Grooves are respectively provided on the outer cylindrical surfaces of the sleeve base (3) and the sleeve end cover (9), and sealing rings (4) are provided in the grooves and are disposed in the inner hole of the sleeve (5).

4. The steering gear stroke unloading valve according to claim 3, characterized in that, The valve body is integrally installed in the steering gear piston (14). One side of the sleeve base (3) is sealedly connected to one end of the steering gear piston (14) by the sealing ring (4) thereon, and one side of the sleeve end cover (9) is threadedly connected to the other end of the steering gear piston (14).

5. The steering gear stroke unloading valve according to claim 4, characterized in that, The steering gear body adopts a recirculating ball type steering gear, and the steering gear body further includes a steering gear housing (11) and a steering gear end cover (12); The steering gear end cover (12) is disposed outside the top of the steering gear housing (11), and a steering gear input shaft (10) is disposed inside the top of the steering gear housing (11). The two adjusting screws (2) are disposed inside the steering gear housing (11), and the ends facing each other are respectively in contact connection with the two valve cores (7).

6. The steering gear stroke unloading valve according to claim 5, characterized in that, Plugs (1) are respectively disposed at the bottom of the steering gear input shaft (10) and the steering gear housing (11), and the plugs (1) are disposed outside the adjusting screws (2).

7. The steering gear stroke unloading valve according to claim 3, characterized in that, An interference fit exists between the valve sleeve (6) and the sleeve (5), and the cylindrical steps of the valve sleeve (6) and the sleeve (5) are flush.

Images