Oil return path structure of steering gear control valve

Abstract

The utility model discloses an oil return path structure of a steering gear control valve, which comprises an internal oil return path and an external oil return path of the steering gear control valve, and the oil return path consists of a screw rod, an input shaft, an upper cover nut, a four-point contact ball bearing, a valve body and a shell, the four-point contact ball bearing is composed of an upper race four-point contact ball bearing, a lower race four-point contact ball bearing, a steel ball four-point contact ball bearing and a retainer four-point contact ball bearing. Due to the fact that the internal oil return way is formed in the four oil return holes evenly distributed in the circumferential direction of the outer circle of the middle portion of the input shaft and the three oil return holes evenly distributed in the bottom of the oil return groove in the circumferential direction of the valve element, and the oil return holes are designed to be straight holes, the machining process is simple, and the manufacturing cost is low; an external oil return way is provided with two oil return grooves formed in the end face of the upper cover nut, the diameter of a bearing annular raceway boss of the screw is equal to the diameter of the outer circle of the valve sleeve, the boundary dimension of a bearing annular raceway is reduced, the upper stroke valve assembly can be arranged outside the valve body conveniently, and the oil return way is compact in structure.

Description

Technical Field

[0001] The utility model relates to an oil return circuit structure of a steering gear control valve. Background Art

[0002] At present, a steering control valve and its supporting structure are commonly seen in China. Its return oil circuit structure is simple, but its external axial and radial support accuracy is insufficient. The other two existing steering control valves and their supporting structures solve the shortcomings of the existing first steering control valve and its supporting structure. However, since the seat ring of the four-point contact ball bearing adopts a pressing structure, the return oil circuit of the existing first steering control valve is cut off and the return oil circuit needs to be redesigned. The internal return oil circuit of the existing second steering control valve is arranged in four circumferentially evenly distributed return oil holes on the upper part of the valve sleeve of the screw, with an inclined hole design. The external return oil circuit has a return oil groove arranged in the valve body and the lower seat ring of the four-point contact ball bearing. The bearing annular raceway on the outer circle of the valve sleeve protrudes from the outer circle of the valve sleeve, resulting in its structure being not compact and having a small scope of application. Utility Model Content

[0003] The utility model mainly solves the technical problems existing in the prior art, thereby providing an oil return circuit structure of a steering gear control valve which has the advantages of simple structure, low manufacturing cost, simple processing technology and wide application range.

[0004] The above technical problems of the utility model are mainly solved by the following technical solutions:

[0005] A return oil circuit structure of a steering gear control valve comprises an internal return oil circuit and an external return oil circuit of the steering control valve, wherein the return oil circuit is composed of a screw, an input shaft, an upper cover nut, a four-point contact ball bearing, a valve body and a shell, wherein the four-point contact ball bearing is composed of an upper seat ring four-point contact ball bearing, a lower seat ring four-point contact ball bearing, a steel ball four-point contact ball bearing and a retainer four-point contact ball bearing, wherein the upper seat ring four-point contact ball bearing and the lower seat ring four-point contact ball bearing are pressed together, two return oil grooves are arranged on the end surface of the upper cover nut, four circumferentially evenly distributed return oil holes are arranged on the outer circle of the middle part of the input shaft, three return oil holes circumferentially evenly distributed at the bottom of the return oil groove are arranged on the valve core, the valve body is provided with an oil return groove and an oil return hole, and an outer oil passage of the shell is provided with an oil return port.

[0006] Preferably, the internal oil return circuit is arranged with four circumferentially evenly distributed oil return holes on the outer circle of the middle part of the input shaft and three circumferentially evenly distributed oil return holes on the valve core at the bottom of the oil return groove, and the oil return holes adopt a straight hole design. The external oil return circuit has a section with two oil return grooves arranged on the end face of the upper cover nut.

[0007] Preferably, the inner hole of the valve sleeve of the screw and the valve core oil return groove of the input shaft form a closed oil return area.

[0008] The beneficial effects of the oil return circuit structure of the steering gear control valve of the utility model are as follows: due to the oil return circuit structure of the steering gear control valve, its internal oil return circuit is arranged on four circumferentially evenly distributed oil return holes on the outer circle of the middle part of the input shaft and three circumferentially evenly distributed oil return holes on the valve core at the bottom of the return oil groove, and the oil return holes adopt a straight hole design, the processing technology is simple and the manufacturing cost is low; its external oil return circuit has a section of two oil return grooves arranged on the end face of the upper cover nut, the diameter of the bearing annular raceway boss of the screw is equal to the outer circle diameter of the valve sleeve, which reduces the outer dimensions of the bearing annular raceway, is conducive to the arrangement of the upper stroke valve assembly on the outside of the valve body, the oil return circuit structure is compact and has a wide range of applications; the oil return channel of the valve body is far away from the oil inlet channel, and not only a split pressure limiting valve but also an integral pressure limiting valve can be arranged on the valve body. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0010] Figure 1 It is a structural schematic diagram of an oil return circuit structure of a steering gear control valve of the utility model;

[0011] In the figure: 1. Input shaft; 4. Upper cover nut; 6. Upper seat ring four-point contact ball bearing; 7. Steel ball four-point contact ball bearing; 8. Lower seat ring four-point contact ball bearing; 9. Retainer four-point contact ball bearing; 13. Screw; 16. Housing; 31. Valve body. DETAILED DESCRIPTION

[0012] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0013] See also Figure 1As shown, the utility model adopts the following technical scheme: a return oil circuit structure of a steering gear control valve, including an internal return oil circuit and an external return oil circuit of the steering control valve, the return oil circuit is composed of a screw 13, an input shaft 1, an upper cover nut 4, a four-point contact ball bearing, a valve body 31, and a shell 16, the four-point contact ball bearing is composed of an upper seat ring four-point contact ball bearing 6, a lower seat ring four-point contact ball bearing 8, a steel ball four-point contact ball bearing 7, and a retainer four-point contact ball bearing 9, the upper seat ring four-point contact ball bearing 6 and the lower seat ring four-point contact ball bearing 8 are pressed together, two return oil grooves are arranged on the end face of the upper cover nut 4, four circumferentially evenly distributed return oil holes are arranged on the outer circle of the middle part of the input shaft 1, three return oil holes circumferentially evenly distributed at the bottom of the return oil groove are arranged on the valve core, the valve body 31 is provided with an oil return groove and an oil return hole, and the outer oil channel of the shell 16 is provided with an oil return port.

[0014] The internal oil return circuit is arranged on four circumferentially evenly distributed oil return holes on the outer circle of the middle part of the input shaft 1 and three circumferentially evenly distributed oil return holes on the valve core at the bottom of the oil return groove, and the oil return holes are designed as straight holes. The external oil return circuit has a section arranged on the end face of the upper cover nut 4 with two oil return grooves.

[0015] The inner hole of the valve sleeve of the screw rod 13 and the oil return groove of the valve core of the input shaft 1 form a closed oil return area.

[0016] The return oil of the internal oil return circuit flows into the three oil return holes on the valve core of the input shaft 1 that are evenly distributed circumferentially at the bottom of the oil return groove, enters the middle torsion bar hole, flows out from the four circumferentially evenly distributed oil return holes on the outer circle of the middle part, and then enters the middle hole area on the end face of the upper cover nut 4, flows into the oil return groove of the valve body 31 along the two oil return grooves on the end face of the upper cover nut 4, and finally flows into the oil return port of the valve body 31 along the oil return hole of the valve body 31 or flows into the oil return port of the housing 16 through the external oil passage of the housing 16.

[0017] The beneficial effects of the oil return circuit structure of the steering gear control valve of the utility model are as follows: due to the oil return circuit structure of the steering gear control valve, its internal oil return circuit is arranged on four circumferentially evenly distributed oil return holes on the outer circle of the middle part of the input shaft and three circumferentially evenly distributed oil return holes on the valve core at the bottom of the return oil groove, and the oil return holes adopt a straight hole design, the processing technology is simple and the manufacturing cost is low; its external oil return circuit has a section of two oil return grooves arranged on the end face of the upper cover nut, the diameter of the bearing annular raceway boss of the screw is equal to the outer circle diameter of the valve sleeve, which reduces the outer dimensions of the bearing annular raceway, is conducive to the arrangement of the upper stroke valve assembly on the outside of the valve body, the oil return circuit structure is compact and has a wide range of applications; the oil return channel of the valve body is far away from the oil inlet channel, and not only a split pressure limiting valve but also an integral pressure limiting valve can be arranged on the valve body.

[0018] It should be understood that in the claims and description of the utility model, all "including..." should be understood as an open-ended meaning, that is, its meaning is equivalent to "at least contains...", and should not be understood as a closed meaning, that is, its meaning should not be understood as "only includes...".

[0019] The specific embodiments described herein are merely examples of the spirit of the present invention. A person skilled in the art of the present invention may make various modifications or additions to the specific embodiments described or replace them in a similar manner, but this will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. An oil return circuit structure of a steering gear control valve, characterized in that: It comprises an internal oil return circuit and an external oil return circuit of a steering control valve. The oil return circuit is composed of a screw, an input shaft, an upper cover nut, a four-point contact ball bearing, a valve body and a shell. The four-point contact ball bearing is composed of an upper seat ring four-point contact ball bearing, a lower seat ring four-point contact ball bearing, a steel ball four-point contact ball bearing and a retainer four-point contact ball bearing. The upper seat ring four-point contact ball bearing and the lower seat ring four-point contact ball bearing are pressed together. Two oil return grooves are arranged on the end face of the upper cover nut. Four circumferentially evenly distributed oil return holes are arranged on the outer circle of the middle part of the input shaft. Three oil return holes circumferentially evenly distributed at the bottom of the oil return groove are arranged on the valve core. The valve body is provided with an oil return groove and an oil return hole. The outer oil passage of the shell is provided with an oil return port.

2. The oil return path structure of a steering gear control valve according to claim 1, characterized in that: The internal oil return circuit is arranged with four circumferentially evenly distributed oil return holes on the outer circle of the middle part of the input shaft and three circumferentially evenly distributed oil return holes on the valve core at the bottom of the oil return groove, and the oil return holes are designed as straight holes. The external oil return circuit has a section arranged on the end face of the upper cover nut with two oil return grooves.

3. The oil return path structure of a steering gear control valve according to claim 2, characterized in that: The inner hole of the valve sleeve of the screw and the valve core oil return groove of the input shaft form a closed oil return area.

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