CN210531594U - Piston for automobile steering gear - Google Patents

Abstract

The utility model provides a piston that auto steering machine was used belongs to mechanical technical field. The problem that a piston and a piston rod of an existing automobile steering engine have clearance collision to generate steering noise is solved. This piston that auto steering machine was used is including the body that is the tube-shape, the middle part position of the outer wall of body has protruding ring portion, the middle part position of the outer wall of protruding ring portion has annular seal groove, be provided with in the annular seal groove and be used for leaning on sealed sealing member with the piston cylinder body, the middle part position of the inner wall of body is provided with the interior annular portion that is used for the spacing assembly of piston rod axial, the both ends of the inner wall of body are provided with the annular groove that is used for the piston rod buffering respectively, the annular groove is for interior annular portion axial symmetric distribution on the inner wall of body, be provided. The utility model discloses simple structure can avoid piston rod and piston gap collision, and difficult production turns to the noise, has improved the comfort level that the vehicle travel.

Description

Piston for automobile steering gear

Technical Field

The utility model belongs to the technical field of machinery, a auto steering machine is related to, especially, relate to a piston that auto steering machine was used.

Background

The steering system is one of the important constituent systems of an automobile. The steering engine is used as a part of a steering system and has irreplaceable effect on steering in normal running of the automobile. The rack and pinion type hydraulic power-assisted steering system is widely applied, wherein a piston rod is arranged in a hydraulic cylinder, a piston is fixed on the piston rod, and the piston is fixed in a hydraulic piston cylinder body. The piston divides the hydraulic piston cylinder into different pressure areas which can be alternately pressurized or relieved.

For example, Chinese patent numbers are: 200810040486.6 the hydraulic cylinder comprises a cylinder body, a piston guide sleeve, a piston rod, a piston fixed in the cylinder body, a piston guide sleeve through which the piston rod passes, a piston fixed on the piston rod, a pressure area formed by the piston and the piston guide sleeve, wherein the outer wall of the piston is in close contact with the inner wall of the cylinder body.

A clearance of 0.5mm to 1.5mm exists between the piston and the piston rod for assembly. However, in the above structure, after the piston and the piston rod are assembled, a gap of 0.5mm to 1.5mm still exists between the piston and the piston rod, and dynamic dryness can occur during the running of the vehicle, so that the vehicle can recover to be stable and maintain the correct running direction, particularly on a bumpy road surface, the excitation reaction from the ground is large, the frequency is high, and the probability of collision between the piston rod and the piston gap is increased due to the deformation of the piston rod, so that the noise of the steering engine is generated, and the noise is transmitted and amplified through the self structure of the steering engine, and the running comfort of the vehicle is influenced.

Disclosure of Invention

The utility model aims at the above-mentioned problem that exists among the prior art, provide a simple structure, can avoid piston rod and piston gap collision, the difficult piston that produces the auto steering machine of turning to the noise.

The purpose of the utility model can be realized by the following technical proposal: the utility model provides a piston that auto steering machine used, is including the body that is the tube-shape, and the middle part position of the outer wall of body has protruding ring portion, the middle part position of the outer wall of protruding ring portion annular seal groove has, annular seal groove in be provided with and be used for leaning on sealed sealing member with the piston cylinder body, its characterized in that, the middle part position of the inner wall of body be provided with the interior annular portion that is used for the spacing assembly of piston rod axial, the both ends of the inner wall of body be provided with the annular groove that is used for the piston rod buffering respectively, the annular groove for interior annular portion axial symmetric distribution on the inner wall of body, the annular groove in be provided with the buffering component.

This piston that auto steering machine was used mainly is through the institutional advancement to piston self, and the both ends of the inner wall of piston body are provided with the annular groove that is used for the piston rod to cushion respectively to be provided with the buffering component in the annular groove, support the energy-absorbing through buffering component and piston rod radial buffering, reduce the steering noise that the clearance collision produced, stable in structure can improve the comfort level that the vehicle went.

In foretell piston that auto steering machine was used, buffer member include elastic rubber ring and elastic compensation ring, elastic rubber ring be in the annular groove that corresponds, elastic compensation ring be in between elastic rubber ring and the annular groove, elastic compensation ring elastic action make the radial deformation of elastic rubber ring part protrusion annular groove form the elastic bulge portion in the elastic rubber ring, elastic bulge portion and piston rod elasticity support and lean on, elastic rubber ring and annular groove between be provided with the joint structure that prevents the elastic rubber ring and radially break away from in the annular groove. The purpose through the elasticity compensating ring is that the elasticity rubber ring supports with the radial buffering of piston rod all the time and leans on, stable in structure.

In the above-mentioned piston for automobile steering gear, the joint structure include that the both ends face distribution of elastic rubber ring has the axial bulge loop that is the symmetric distribution, be provided with the screens groove on the cell wall of the annular groove relative with the axial bulge loop, when elastic rubber ring was in the annular groove that corresponds, and this axial bulge loop was in the screens inslot that corresponds. The purpose of setting up like this can effectively avoid elastic rubber ring to break away from in the annular groove internal diameter, stable in structure, long service life.

In the above piston for a steering gear of an automobile, a cross section of the elastic projection portion is in an arc shape protruding inwards in an axial direction. The purpose of setting up like this makes elastic bulge and piston rod be line, face contact, and the elasticity is supported stable in structure, and radial support is supported elastic energy-absorbing effectually.

In the above-mentioned piston for steering gear, the elastic compensation ring include the arc form body that is the axial internal bulge, the both ends of arc form body have the joint ring that is the symmetric distribution respectively, still be provided with the joint groove on the cell wall of the annular groove relative with the joint ring, when the elastic compensation ring was in the annular groove that corresponds, and this joint ring was in the joint inslot that corresponds. The purpose of setting up like this can prevent effectively that the elasticity compensating ring from radially breaking away from in the annular groove, long service life.

In foretell piston that auto steering used, the sealing member include that rubber supports the backing ring and is in the rubber sealing ring that rubber supported the backing ring outside, rubber support the outer wall that has the triangular groove on the backing ring, the inner wall of rubber sealing ring on have triangle-shaped joint portion, the size, the shape and the triangular groove looks adaptation of triangle-shaped joint portion, when rubber sealing ring is in rubber support the backing ring outside, and this triangle-shaped joint portion is located the triangular groove. The purpose of setting up like this is when making the sealing member support against with the piston cylinder body, guarantees the sealed validity of sealing member and piston cylinder body, long service life.

Compared with the prior art, the piston for the automobile steering gear has the advantages that: improve the structure of this piston, be provided with the buffering component in the annular groove, reduced the vehicle driving in-process and leaded to the noise that turns to that piston rod and piston gap collision produced because of the excitation reaction on road surface, the utility model discloses simple structure can avoid piston rod and piston gap collision, and difficult production turns to the noise, has improved the comfort level that the vehicle travel.

Drawings

Fig. 1 is a schematic sectional view of a piston for a steering gear of an automobile according to the present invention.

Fig. 2 is an enlarged schematic view of a portion a in fig. 1.

In the figure, 1, a body; 2. a convex ring part; 3. an inner ring portion; 4. an elastic rubber ring; 5. an elastic compensation ring; 6. an elastic boss; 7. an axial convex ring; 8. a snap ring; 9. a rubber abutment ring; 10. a rubber seal ring; 11. a triangular clamping part.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

As shown in fig. 1 and 2, the piston for the automobile steering gear mainly comprises a cylindrical body 1, a convex ring part 2 is arranged at the middle position of the outer wall of the body 1, an annular sealing groove is arranged at the middle position of the outer wall of the convex ring part 2, a sealing element used for abutting against a piston cylinder body to seal is arranged in the annular sealing groove, an inner ring part 3 used for axial limiting assembly of a piston rod is arranged at the middle position of the inner wall of the body 1, annular grooves used for buffering the piston rod are respectively arranged at two ends of the inner wall of the body 1, the annular grooves are axially and symmetrically distributed on the inner wall of the body 1 relative to the inner ring part 3, and a buffering component is arranged.

When actually making, this buffer member mainly comprises elastic rubber ring 4 and elastic compensation ring 5, elastic rubber ring 4 is located the annular groove that corresponds, elastic compensation ring 5 is between elastic rubber ring 4 and the annular groove, 5 elastic action in elastic rubber ring 4 make elastic rubber ring 4 radial deformation part protrusion annular groove form elastic bulge 6, elastic bulge 6 supports with piston rod elasticity and leans on, be provided with the joint structure that prevents elastic rubber ring 4 radial break away from in the annular groove between elastic rubber ring 4 and the annular groove.

In actual manufacturing, the specific implementation of the clamping structure is as follows: the two end faces of the elastic rubber ring 4 are distributed with axial convex rings 7 which are symmetrically distributed, the groove wall of the annular groove opposite to the axial convex rings 7 is provided with a clamping groove, and when the elastic rubber ring 4 is positioned in the corresponding annular groove, the axial convex rings 7 are positioned in the corresponding clamping grooves; the cross section of the elastic bulge part 6 is in an arc shape protruding inwards in the axial direction.

In practical application, this elastic compensation ring 5 mainly comprises the arc form body that is the axial internal bulge, and the both ends of arc form body have the joint ring 8 that is the symmetric distribution respectively, still are provided with the joint groove on the cell wall of the annular groove relative with joint ring 8, and when elastic compensation ring 5 was in the annular groove that corresponds, and this joint ring 8 was in the joint inslot that corresponds.

When actually making, this sealing member mainly by rubber support ring 9 with be in rubber support ring 9 outside rubber seal ring 10 constitute, rubber support ring 9 has the triangle-shaped groove on the outer wall, has triangle-shaped joint portion 11 on the inner wall of rubber seal ring 10, triangle-shaped joint portion 11's size, shape and triangle-shaped groove looks adaptation, when rubber seal ring 10 is in rubber support ring 9 outside, and this triangle-shaped joint portion 11 is located the triangle-shaped groove.

Those not described in detail in this specification are within the skill of the art. The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims (6)

1. The utility model provides a piston that auto steering machine was used, is including body (1) that is the tube-shape, and the middle part position of the outer wall of body (1) has protruding ring portion (2), the middle part position of the outer wall of protruding ring portion (2) annular seal groove has, the annular seal groove in be provided with and be used for leaning on sealed sealing member with the piston cylinder body, its characterized in that, the middle part position of the inner wall of body (1) be provided with inner ring portion (3) that are used for the spacing assembly of piston rod axial, the both ends of the inner wall of body (1) be provided with the annular groove that is used for the piston rod buffering respectively, the annular groove for inner ring portion (3) axial symmetric distribution on the inner wall of body (1), the annular groove in be provided with buffer member.

2. The piston for the automobile steering gear according to claim 1, wherein the buffer member comprises an elastic rubber ring (4) and an elastic compensation ring (5), the elastic rubber ring (4) is located in a corresponding annular groove, the elastic compensation ring (5) is located between the elastic rubber ring (4) and the annular groove, the elastic compensation ring (5) elastically acts on the elastic rubber ring (4) to enable the radially deformed part of the elastic rubber ring (4) to protrude out of the annular groove to form an elastic bulge (6), the elastic bulge (6) is elastically abutted to the piston rod, and a clamping structure for preventing the elastic rubber ring (4) from radially separating from the annular groove is arranged between the elastic rubber ring (4) and the annular groove.

3. The piston for the automobile steering gear according to claim 2, wherein the clamping structure comprises two end faces of the elastic rubber ring (4) which are provided with symmetrically distributed axial convex rings (7), clamping grooves are arranged on the groove walls of the annular grooves opposite to the axial convex rings (7), and when the elastic rubber ring (4) is arranged in the corresponding annular groove, the axial convex rings (7) are arranged in the corresponding clamping grooves.

4. A piston for a motor vehicle steering gear according to claim 3, wherein said resilient nose portion (6) has an arc shape in cross section which is inwardly convex in the axial direction.

5. The piston for the automobile steering gear according to claim 4, wherein the elastic compensation ring (5) comprises an arc-shaped body protruding inwards in the axial direction, the two ends of the arc-shaped body are respectively provided with the clamping rings (8) distributed symmetrically, the wall of the annular groove opposite to the clamping rings (8) is further provided with a clamping groove, and when the elastic compensation ring (5) is located in the corresponding annular groove, the clamping rings (8) are located in the corresponding clamping grooves.

6. The piston for the automobile steering gear according to claim 1 or 5, characterized in that the sealing member comprises a rubber abutting ring (9) and a rubber sealing ring (10) arranged outside the rubber abutting ring (9), the outer wall of the rubber abutting ring (9) is provided with a triangular groove, the inner wall of the rubber sealing ring (10) is provided with a triangular clamping portion (11), the size and the shape of the triangular clamping portion (11) are matched with the triangular groove, and when the rubber sealing ring (10) is arranged outside the rubber abutting ring (9), the triangular clamping portion (11) is arranged in the triangular groove.

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