Rack bushing and steering gear

Abstract

The rack bushing comprises an elastic body and a sealing plug, the body is provided with a first storage groove, a sealing cavity and a flow channel communicated with the first storage groove and the sealing cavity, and the sealing plug is arranged in the flow channel in a sliding mode. When the body is extruded, the pressure in the sealing cavity is increased, the sealing plug is pushed to move in the direction close to the first storage groove, and the lubricating medium in the first storage groove can be extruded. According to the rack bushing disclosed by the utility model, the lubricating medium is stored in the first storage groove, so that the rack can be self-lubricated when moving relative to the rack bushing, dry friction is avoided, and the problems of friction abnormal sound and abrasion of the rack bushing caused by insufficient lubrication after a vehicle travels for a higher mileage are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of automobile steering gear, especially to a rack bushing and steering gear. BACKGROUND

[0002] In the steering gear, the rack is installed in the rack bushing, the rack bushing will bear the radial pressure and axial friction force from the rack, when the rack bushing is insufficiently lubricated, it will cause dry friction phenomenon between the rack and the rack bushing, thereby producing abnormal sound when steering, and accelerating the wear of the inner surface of the rack bushing, especially after the vehicle travels a high mileage, the above problems will become more prominent. SUMMARY

[0003] The utility model discloses a rack bushing and steering gear, which can solve the problem of friction abnormal sound caused by insufficient lubrication of the rack bushing.

[0004] To solve the above problems, the utility model provides a rack bushing, which comprises a body with elasticity and a sealing plug, the body is provided with a first storage groove, a sealing cavity and a flow channel communicating the first storage groove and the sealing cavity, and the sealing plug is slidably arranged in the flow channel, when the body is extruded, the pressure in the sealing cavity increases, the sealing plug is pushed to move in the direction close to the first storage groove, and the lubricating medium in the first storage groove can be extruded.

[0005] Optionally, the rack bushing further comprises a one-way valve, the one-way valve is arranged at one end of the body where the sealing cavity is arranged and communicates with the sealing cavity, and the one-way valve is used for supplementing the gas in the sealing cavity to realize the movement of the sealing plug in the flow channel in the direction away from the sealing cavity.

[0006] Optionally, the rack bushing further comprises an elastic film, the elastic film is located at one end of the first storage groove away from the inner surface of the body or is arranged in the middle part of the first storage groove, the elastic film is provided with an oil outlet, and when the lubricating medium in the first storage groove is extruded, the oil outlet of the elastic film is switched from the closed state to the open state for the flow of the lubricating medium.

[0007] Further, one end of the body is provided with a limiting flange, and the limiting flange is used for being embedded in a limiting groove in the housing of the steering gear.

[0008] Optionally, the sealing cavity is arranged at one end of the body where the limiting flange is arranged and is arranged inside the region of the body where the limiting flange is arranged.

[0009] Optionally, the body is provided with a plurality of first storage grooves, and the plurality of first storage grooves are arranged in the inner wall of the body at one end close to the limiting flange in a circumferential direction.

[0010] Optionally, the body is provided with a second storage groove located on the side of the first storage groove away from the limiting flange.

[0011] Optionally, the two opposite ends of the body are respectively provided with a head buffer groove and a tail buffer groove, the head buffer groove extends axially from the first end of the body to a position close to the second end of the body, the tail buffer groove extends axially from the second end of the body to a position close to the first end of the body, and the head buffer groove and the tail buffer groove are circumferentially staggered on the body, and the head buffer groove and the tail buffer groove both extend radially from the inner surface to the outer surface of the body.

[0012] The utility model also provides a steering gear, including casing and the rack bushing, the rack bushing fixed mounting in the casing.

[0013] The utility model discloses a steering gear still includes sealing ring, the body is recessed from its outer surface and forms the installation groove, the sealing ring is nested in the body outside and partially is embedded in the installation groove, when the rack bushing is installed in the casing, the sealing ring and the casing interference fit of steering gear.

[0014] Compared with the prior art, the technical scheme of the utility model has the following beneficial effects: the rack bushing of the utility model stores lubricating medium in the first storage groove, can make the rack self-lubrication when moving relative to the rack bushing, avoids dry friction, prevents the problem of friction noise and rack bushing wear due to insufficient lubrication after the vehicle travels a high mileage. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will be briefly introduced the drawings needed to be used in the embodiment, should understand, the following drawings only shows some embodiments of the utility model, therefore should not be regarded as the limitation to the range, for the ordinary skilled person in the art, under the premise of not paying the creative labor, still can obtain other related drawings according to these drawings.

[0016] Figure 1 It is the structure schematic view of the steering gear of the utility model.

[0017] Figure 2 It is the partial sectional view of the steering gear of the utility model.

[0018] Figure 3 It is the structure schematic view of the rack bushing of one embodiment of the utility model.

[0019] Figure 4Another view structure schematic view of the rack bushing of an embodiment of the utility model.

[0020] Figure 5 Isometric section view of the rack bushing of an embodiment of the utility model.

[0021] In the drawing:

[0022] 1-body;11-first storage tank;12-sealing cavity;13-flow passage;14-limit flange;15-head buffer groove;16-tail buffer groove;17-mounting cavity;171-limit groove;172-second storage tank;18-mounting hole;19-mounting groove;

[0023] 2-sealing plug;3-one-way valve;4-rack bushing;5-sealing ring;6-housing;7-rack. DETAILED DESCRIPTION

[0024] The specific embodiments of the utility model will be described in detail below with reference to the drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the description of the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the utility model.

[0025] The terms "upper", "lower", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, or the orientation or positional relationship of the utility model product when it is usually placed, and are only for the convenience of description and simplification of description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0026] The terms "first", "second" and the like are only for distinguishing similar attributes, and do not indicate or imply relative importance or a particular order.

[0027] The terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, in addition to containing the listed elements, other elements not explicitly listed can also be contained.

[0028] Please refer to Figure 1 And Figure 2The utility model provides a kind of diverter, including shell 6, rack 7 and rack bushing 4, rack bushing 4 is fixedly installed in the inside of shell 6, rack 7 passes through rack bushing 4 and is slidably connected with rack bushing 4.Wherein, rack bushing 4 is used to support rack 7, ensure that rack 7 moves smoothly relative to shell 6, to realize the steering of vehicle.Specifically, installation cavity 17 for being used for rack 7 to pass through is equipped on shell 6, rack bushing 4 is fixed to installation cavity 17 by the way of interference fit, and rack 7 is connected with shell 6 by rack bushing 4.

[0029] Please combine Figures 2 to 5 The utility model discloses a rack bushing 4, including body 1 and sealing ring 5, wherein, sealing ring 5 is used for connecting rack bushing 4 with shell 6.In an example, body 1 is substantially hollow cylindrical, is made of rubber etc. with elastic material quality, and installation hole 18 for being used for rack 7 to pass through is opened along its axial direction in body 1, and rack 7 passes through installation hole 18 and is slidably connected with rack bushing 4.Body 1 is recessed from its outer surface and forms installation groove 19, and sealing ring 5 is sleeved on the outside of body 1 and partially embedded in installation groove 19.Sealing ring 5 and the interference fit of installation cavity 17 of shell 6 fix body 1 and install in the inside of shell 6. Optionally, the number of sealing ring 5 is two, and two sealing rings 5 are arranged along the axial direction of body 1 to improve the connection reliability of rack bushing 4 and shell 6.

[0030] One end of body 1 is provided with limit flange 14 for limiting the relative position of rack bushing 4 and shell 6, specifically, limit flange 14 is formed by protruding radially outward from the outer surface of body 1, and limit flange 14 is embedded in limit groove 171 on the inner surface of shell 6 to prevent rack bushing 4 from moving axially along rack 7.

[0031] Two opposite ends of body 1 are respectively provided with head buffer groove 15 and tail buffer groove 16, specifically, head buffer groove 15 extends axially from the first end of body 1 to a position close to the second end of body 1, tail buffer groove 16 extends axially from the second end of body 1 to a position close to the first end of body 1, and head buffer groove 15 and tail buffer groove 16 both extend radially from the inner surface to the outer surface of body 1. The above-mentioned buffer grooves enable rack bushing 4 to deform radially along body 1, specifically, when the contact surface of body 1 and rack 7 is damaged due to friction, the above-mentioned buffer grooves enable rack bushing 4 to contract radially along body 1, ensuring that the gap between rack bushing 4 and rack 7 meets the assembly requirements, thereby effectively supporting rack 7 and improving stability. In addition, the above-mentioned buffer grooves can reduce the contact area of rack 7 and rack bushing 4, thereby reducing the friction between rack 7 and rack bushing 4, facilitating installation and improving installation efficiency.

[0032] Optionally, the number of the head buffer grooves 15 and the tail buffer grooves 16 is six, and the head buffer grooves 15 and the tail buffer grooves 16 are staggered along the circumference of the body 1, so as to reduce the contact area and improve the structural strength of the body 1.

[0033] In an example, the body 1 is provided with first storage grooves 11 for storing lubricating medium. A plurality of first storage grooves 11 are arranged on the inner wall of the body 1 near one end of the limiting flange 14 along the circumference of the body 1 and are in communication with the mounting hole 18 in the middle of the body 1. The above-mentioned storage grooves can enable the rack 7 to be self-lubricated when moving relative to the rack bushing 4, avoid dry friction, and prevent frictional noise caused by insufficient lubrication.

[0034] In another example, the body 1 is also provided with second storage grooves 172 for storing lubricating medium. The second storage grooves 172 are located on the side of the first storage grooves 11 away from the limiting flange 14, and a plurality of second storage grooves 172 can be arranged in a plurality of rows along the circumference of the body 1, and each row of second storage grooves 172 includes a plurality of second storage grooves 172 arranged along the axis of the body 1. In this way, the oil storage capacity in the rack bushing 4 can be improved, and frictional noise can be further prevented. The cross-section of the first storage groove 11 and the second storage groove 172 can be circular arc, trapezoidal, triangular, rectangular, etc.

[0035] Please refer to Figure 1 and Figure 4 In an example, the rack bushing 4 also includes a sealing plug 2 and a one-way valve 3, and in this example, the body 1 is also provided with a sealing cavity 12 and a flow channel 13, the sealing plug 2 is slidably embedded in the flow channel 13 and separates the first storage groove 11 and the sealing cavity 12. The sealing cavity 12 is arranged on one end of the body 1 where the limiting flange 14 is arranged, and is arranged inside the area of the body 1 where the limiting flange 14 is arranged. The sealing cavity 12 is in communication with the first storage groove 11 through the flow channel 13, but the sealing cavity 12 is not in communication with the second storage groove 172. Optionally, the flow channel 13 is arranged at the bottom of the first storage groove 11 and extends along the axis of the body 1, and the diameter of the bottom of the first storage groove 11 gradually decreases in the direction of approaching the flow channel 13 along the radial direction of the body 1.

[0036] When the rack 7 moves relative to the rack bushing 4, the body 1 of the rack bushing 4 is extruded, the volume of the sealing cavity 12 is reduced, the pressure is increased, the sealing plug 2 is pushed to move in the direction close to the first storage groove 11, the lubricating medium in the first storage groove 11 is extruded, part of the lubricating medium flows out of the first storage groove 11, and the rack 7 is lubricated. The one-way valve 3 is arranged at one end of the body 1 provided with the sealing cavity 12 and communicates with the sealing cavity 12 and the external environment. Specifically, the one-way valve 3 is fixedly installed on the limiting flange 14 and is used to open after the sealing cavity 12 is pressed to supplement the gas in the sealing cavity 12. In this way, the sealing plug 2 can move in the flow channel 13 to the direction away from the sealing cavity 12, so that the rack bushing 4 can continuously provide the lubricating medium when the body 1 is extruded, and the lubrication effect of the automobile steering gear after a higher mileage is improved. It should be noted that when the body 1 is extruded, the lubricating medium in the second storage groove 172 can flow out of the second storage groove 172 to lubricate the rack 7, but the principle is slightly different from that of the first storage groove 11. The lubricating medium in the second storage groove 172 can only flow out due to the deformation of the body 1, and is irrelevant to the sealing cavity 12.

[0037] In an example, the rack bushing 4 further comprises an elastic film (not shown in the figure), the elastic film is connected to the part of the body 1 close to the first storage groove 11, the elastic film is located at one end of the first storage groove 11 away from the inner surface of the body 1, or is arranged in the middle of the first storage groove 11, the elastic film is provided with an oil outlet, which is optionally substantially in the shape of a "cross" or a "rice" character, etc., for the flow of lubricating medium, gas and the like, when the lubricating medium in the first storage groove 11 is extruded, the oil outlet of the elastic film switches from a closed state to an open state, realizing automatic lubrication. The elastic film can be fixed with the body 1 by adhesive bonding, fixed ring pressure connection or the like, or can be integrally formed with the body 1. Specifically, the body 1 extends from the inner surface of the first storage groove 11 in the direction of the inside of the first storage groove 11 to form the elastic film.

[0038] The working principle of the rack bushing 4 in the above example is as follows: when the rack 7 moves relative to the shell 6, and the rack 7 and the rack bushing 4 produce dry friction due to lack of lubrication, the limiting flange 14 is extruded with the surface of the limiting groove 171 of the shell 6 to produce elastic deformation. At this time, the volume of the sealing cavity 12 is reduced, the pressure is increased, the sealing plug 2 is pushed to move in the direction close to the first storage groove 11, the pressure in the first storage groove 11 is increased, and when the pressure in the first storage groove 11 is increased to a preset value, the elastic film is deformed elastically, the oil outlet switches from a closed state to an open state, the lubricating medium flows out, and automatic lubrication is realized. In this way, the problem of dry friction between the rack bushing 4 and the rack 7 due to insufficient lubrication of the automobile steering gear after a high mileage, friction noise and rack bushing 4 wear are solved, and the service life is improved.

[0039] The above merely describes a specific implementation of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A rack bushing characterized by: The application relates to a rack bushing (4) comprising a body (1) and a sealing plug (2), the body (1) is provided with a first storage groove (11), a sealing cavity (12) and a flow channel (13) connecting the first storage groove (11) and the sealing cavity (12), and the sealing plug (2) is slidably arranged in the flow channel (13); when the body (1) is pressed, the pressure in the sealing cavity (12) is increased, the sealing plug (2) is pushed to move towards the first storage groove (11), and the lubricating medium in the first storage groove (11) can be pressed.

2. Rack bushing according to claim 1, characterized in that: The application further comprises a one-way valve (3) arranged at one end of the body (1) provided with the sealing cavity (12) and communicated with the sealing cavity (12), the one-way valve (3) is used for supplementing the gas in the sealing cavity (12) and moving the sealing plug (2) in the flow channel (13) away from the sealing cavity (12).

3. Rack bushing according to claim 2, characterized in that: The application further comprises an elastic film arranged at one end of the first storage groove (11) away from the inner surface of the body (1) or arranged in the middle of the first storage groove (11), the elastic film is provided with an oil outlet, and the oil outlet of the elastic film is switched from a closed state to an open state for the lubricating medium to flow when the lubricating medium in the first storage groove (11) is pressed.

4. The rack bushing of claim 1, wherein: One end of the body (1) is provided with a limiting flange (14) embedded in a limiting groove (171) in the shell (6) of a steering gear.

5. Rack bushing according to claim 4, characterized in that: The sealing cavity (12) is arranged at one end of the body (1) provided with the limiting flange (14) and arranged inside the region of the body (1) provided with the limiting flange (14).

6. The rack bushing of claim 4, wherein: The body (1) is provided with a plurality of first storage grooves (11), and the plurality of first storage grooves (11) are arranged at one end of the inner wall of the body (1) close to the limiting flange (14) in a circumferential direction.

7. Rack bushing according to claim 6, characterized in that: The body (1) is provided with a second storage groove (172) arranged at one side of the first storage groove (11) away from the limiting flange (14).

8. The rack bushing of claim 1, wherein: Two opposite ends of the body (1) are respectively provided with a head buffer groove (15) and a tail buffer groove (16), the head buffer groove (15) extends from the first end of the body (1) to a position close to the second end of the body (1) in an axial direction, the tail buffer groove (16) extends from the second end of the body (1) to a position close to the first end of the body (1) in an axial direction, the head buffer groove (15) and the tail buffer groove (16) are staggered in a circumferential direction of the body (1), and the head buffer groove (15) and the tail buffer groove (16) both extend from the inner surface to the outer surface of the body (1) in a radial direction of the body (1).

9. A diverter characterized by: The application further relates to a steering gear (5) comprising a shell (6) and the rack bushing (4) according to any one of claims 1 to 8, and the rack bushing (4) is fixedly arranged in the shell (6).

10. The diverter of claim 9, wherein: Further comprising a sealing ring (5), the body (1) is recessed from its outer surface to form a mounting groove (19), the sealing ring (5) is sleeved on the outer surface of the body (1) and partially embedded in the mounting groove (19), when the rack bushing (4) is installed in the housing (6), the sealing ring (5) is in interference fit with the housing (6) of the steering gear.

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