CN214367735U

CN214367735U - Sealing structure for circulating ball hydraulic steering gear

Info

Publication number: CN214367735U
Application number: CN202023217483.0U
Authority: CN
Inventors: 樊斌
Original assignee: Hubei Northstars Automobile Steering System Co ltd
Current assignee: Yubei steering system (Hubei) Co.,Ltd.
Priority date: 2020-12-28
Filing date: 2020-12-28
Publication date: 2021-10-08
Anticipated expiration: 2030-12-28

Abstract

The utility model discloses a seal structure for recirculating ball hydraulic steering gear, including recirculating ball hydraulic steering gear's casing, valve body and cylinder body, the valve body with the casing passes through the bolt and links to each other, be equipped with the diverter valve in the cylinder body, the diverter valve passes through the casing, valve body and fastener are fixed on cylinder body owner jar hole jackshaft, nested rack piston in the casing, the tooth portion of rack piston meshes with the rocking arm axle, the rack piston passes through the cooperation of raceway and steel ball and moves from side to side on the diverter valve, be provided with the seal groove on the rack piston, install integral type combination sealing washer in the seal groove; the integrated combined sealing ring is not easy to distort in the movement process, improves the sealing performance, and can be suitable for sealing the complex relative movement of the rack piston of the recirculating ball steering gear under high pressure.

Description

Sealing structure for circulating ball hydraulic steering gear

Technical Field

The utility model relates to a steering gear part technical field, concretely relates to a seal structure for recirculating ball hydraulic steering gear.

Background

Many parts of the circulating ball hydraulic steering gear are involved in sealing, most of which are static seals, but the sealing of the rack piston with the main assist force in the circulating ball hydraulic steering gear is dynamic, and the sealing method commonly used at present is sealing by combining an O-ring and a high-pressure sealing ring. The O-shaped ring is made of hydrogenated butadiene-acrylonitrile rubber and plays a supporting role, and the high-pressure sealing ring is made of polytetrafluoroethylene and plays a sealing role in reciprocating motion.

As the system pressure used by the recirculating ball hydraulic steering gear becomes higher and higher, the oil in the hydraulic system is heated at a high pressure for a long time, and the ptfe softens at a high temperature. When the system high temperature, steering gear rack piston is pressed to circulation ball liquid under reciprocating motion, O type circle, high-pressure seal ring receive by the force of the radial interference fit of rack piston and the highly compressed thrust coincidence effect of system, cause high-pressure seal ring to take place the distortion easily, produce the internal leakage, cause to turn to heavily, influence the travelling comfort that the driver controlled.

In order to solve the technical problem, the utility model provides a seal structure for recirculating ball hydraulic steering gear.

SUMMERY OF THE UTILITY MODEL

The utility model aims at the not enough of above-mentioned prior art, the utility model aims at providing a seal structure for recirculating ball hydraulic steering ware, the utility model discloses a realize through following technical scheme.

The utility model provides a seal structure for recirculating ball hydraulic steering ware, includes recirculating ball hydraulic steering ware's casing, valve body and cylinder body, the valve body with the casing passes through the bolt and links to each other, be equipped with the diverter valve in the cylinder body, the diverter valve passes through the casing valve body and fastener are fixed on the cylinder body owner cylinder hole jackshaft, nested rack piston in the casing, the tooth portion and the rocking arm axle of rack piston mesh mutually, the rack piston passes through the cooperation of raceway and steel ball and is in the last side-to-side motion of diverter valve, be provided with the seal groove on the rack piston, install integral type built-up seal circle in the seal groove.

Specifically, when the integrated combined sealing ring is used for sealing a rack piston of the recirculating ball steering gear, the annular convex part of the inner ring of the integrated combined sealing ring is assembled on the rack piston sealing groove, a gap exists between the sealing groove and the integrated combined sealing ring, the integrated combined sealing ring can slide in the sealing groove, and after the outer ring of the integrated combined sealing ring is compressed, the integrated combined sealing ring is in transition fit with a cylinder hole of the recirculating ball hydraulic steering gear, the force of interference fit extrusion is avoided, so the integrated combined sealing ring is not easy to distort in the motion process, the sealing performance is improved, and the integrated combined sealing ring can be suitable for sealing the complex relative motion of the rack piston of the recirculating ball steering gear under high pressure.

Preferably, the integrated combined sealing ring is of an inverted convex structure and comprises an annular convex inner ring and an annular convex outer ring, and the annular convex inner ring is tightly attached to the bottom diameter of the sealing groove; wherein the inner ring plays a supporting role, and the outer ring plays a sealing role.

Preferably, the annular raised inner ring is made of hydrogenated nitrile-butadiene rubber; the hydrogenated butadiene-acrylonitrile rubber has good elasticity and is easy to install.

Preferably, the outer ring is made of graphite modified polytetrafluoroethylene; the graphite modified polytetrafluoroethylene has good wear resistance.

Preferably, the size of the integrated combined sealing ring is matched according to the outer diameter of the rack piston and the inner diameter of the cylinder body.

Preferably, the diameter of the sealing groove is larger than that of the integrated combined sealing ring.

Compared with the prior art, the beneficial effects of the utility model reside in that:

1. the integrated combined sealing ring is not easy to distort in the movement process, improves the sealing performance, and can be suitable for sealing the complex relative movement of the rack piston of the recirculating ball steering gear under high pressure.

2. The novel annular raised inner ring is made of hydrogenated butadiene-acrylonitrile rubber; the hydrogenated butadiene-acrylonitrile rubber has good elasticity and is easy to assemble;

3. the outer ring of the novel integrated combined sealing ring is made of graphite modified polytetrafluoroethylene, has good wear resistance and prolongs the service life of the sealing structure.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a sectional view of the integrated composite seal ring.

In the figure: 1. a housing; 2. a valve body; 3. a cylinder body; 4. a steering valve; 5. an intermediate shaft; 6. a rack piston; 601. a sealing groove; 7. a rocker shaft; 8. an integrated combined sealing ring; 801. an annular raised inner ring; 802. and an outer ring.

Detailed Description

The technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The present invention will be described in further detail below with reference to specific embodiments and with reference to the accompanying drawings.

Example 1

As shown in fig. 1-2, a sealing structure for a recirculating ball hydraulic steering gear comprises a casing 1, a valve body 2 and a cylinder body 3 of the recirculating ball hydraulic steering gear, wherein the casing 1 is connected with the valve body 2 through bolts, a steering valve 4 is arranged in the cylinder body 3, the steering valve 4 is fixed on a main cylinder hole intermediate shaft 5 of the cylinder body 3 through the casing 1, the valve body 2 and a fastener, a rack piston 6 is nested in the casing 1, a tooth part of the rack piston 6 is meshed with a rocker arm shaft 7, the rack piston 6 moves left and right on the steering valve 4 through the cooperation of a raceway and steel balls, a sealing groove 601 is arranged on the rack piston 6, and an integrated combined sealing ring 8 is arranged in the sealing groove 601.

The integral type combination sealing washer 8 is installed in the seal groove 601 of rack piston 6, and integral type combination sealing washer 8 can be earlier along with if the oil pressure removes to realize sealed towards the low-pressure region direction, and rack piston 6 drives rocking arm shaft 7 and rotates towards both sides, and other spare parts of rethread a steering system realize the power-assisted steering function.

The integrated combined sealing ring 8 is of an inverted convex structure and comprises an annular convex inner ring 801 and an outer ring 802, and the annular convex inner ring 801 is tightly attached to the bottom diameter of the sealing groove 601.

The annular raised inner ring 801 is made of hydrogenated nitrile rubber.

The outer ring 802 is made of graphite modified polytetrafluoroethylene, and is rectangular.

The size 8 of the integrated combined sealing ring is matched according to the outer diameter of the rack piston 6 and the inner diameter of the cylinder body 3.

The width of the bottom of the sealing groove 601 is larger than that of the integrated combined sealing ring 8.

Integral type combination sealing washer 8 is the structure of falling the convex, the resistance when having reduced the motion, when axial atress area is unchangeable, it is more sensitive to build the pressure, seal groove 601 end footpath is hugged closely to integral type combination sealing washer 8's annular protruding inner circle 801, and seal groove 601 wide is in the sealing washer, integral type combination sealing washer 8 can slide in seal groove 601, and integral type combination sealing washer 8 has annular protruding inner circle 801, when 1 built-in pressure of casing, the Shan pressure will be used in on the oil inlet face of annular protruding inner circle 801, make integral type combination sealing washer 8 remove to the low pressure chamber direction, and integral type combination sealing washer 8's outer lane 802 can be expanded by the pressure, thereby hug closely casing 1, with realize sealed, sealing performance has been improved. When carrying out clearance fit sealing to casing 1, do not have the extruded power of interference fit, the difficult distortion that takes place of integral type combination sealing washer 8 motion in-process can be applicable to the sealed of between the miscellaneous relative motion part of complex.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; these modifications and substitutions do not depart from the essence of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A sealing structure for a circulating ball hydraulic steering gear is characterized by comprising a shell (1) of the circulating ball hydraulic steering gear, a valve body (2) and a cylinder body (3), the shell (1) is connected with the valve body (2) through a bolt, a steering valve (4) is arranged in the cylinder body (3), the steering valve (4) is fixed on a main cylinder hole intermediate shaft (5) of the cylinder body (3) through the shell (1), the valve body (2) and a fastener, a rack piston (6) is nested in the shell (1), the tooth part of the rack piston (6) is meshed with the rocker shaft (7), the rack piston (6) moves left and right on the steering valve (4) through the matching of the roller path and the steel ball, the rack piston (6) is provided with a sealing groove (601), and an integrated combined sealing ring (8) is installed in the sealing groove (601).

2. The sealing structure for the recirculating ball hydraulic steering gear according to claim 1, wherein the integrated combined sealing ring (8) is of an inverted convex structure and comprises an annular convex inner ring (801) and an outer ring (802), and the annular convex inner ring (801) is tightly attached to the bottom diameter of the sealing groove (601).

3. A sealing structure for a recirculating ball hydraulic steering gear according to claim 2, wherein the annular raised inner ring (801) is made of hydrogenated nitrile rubber.

4. A sealing structure for a recirculating ball hydraulic steering gear according to claim 2, wherein the outer ring (802) is made of graphite modified polytetrafluoroethylene and is rectangular.

5. A sealing structure for a recirculating ball hydraulic steering gear according to claim 1, wherein the size of the integrated composite sealing ring (8) is adapted according to the outer diameter of the rack piston (6) and the inner diameter of the cylinder (3).

6. A sealing structure for a recirculating ball hydraulic steering gear according to claim 1, wherein the width of the bottom of the sealing groove (601) is larger than the width of the integrated composite sealing ring (8).