CN216185434U - Electric power steering gear and output shaft sector gear structure thereof - Google Patents

Abstract

The utility model discloses an electric power steering gear and an output shaft sector gear structure thereof, and relates to the technical field of automobile steering devices. The bulge makes up the gap between the tooth part and the rack nut, so that the tooth part and the rack nut are tightly meshed, the output torque of the sector gear and the rack nut is increased, the stability of the rear wheel is further increased, and the risk of vehicle body drifting is reduced.

Description

Electric power steering gear and output shaft sector gear structure thereof

Technical Field

The utility model relates to the technical field of automobile steering devices, in particular to an electric power steering gear and an output shaft sector gear structure thereof.

Background

In order to meet the load demand of large vehicles in the passenger vehicle market, more and more vehicles are changed from hydraulic power assistance to electric power assistance, but the front wheel steering is mainly adopted for automobile steering, the front wheel steering technology is mature, the price is relatively low, but when the vehicle is in sharp turning at high speed, the vehicle body is easy to drift, and the potential safety hazard is very large.

SUMMERY OF THE UTILITY MODEL

1. Technical problem to be solved by the utility model

Aiming at the technical problem that a front wheel steering vehicle body is easy to drift, the utility model provides an electric power steering gear and an output shaft sector gear structure thereof, which increase the output torque of sector gears and a rack nut, further increase the stability of a vehicle and reduce the risk of vehicle body drift.

2. Technical scheme

In order to solve the problems, the technical scheme provided by the utility model is as follows: the utility model provides an output shaft fan-tooth structure, includes the axis body and follows the tooth portion that axis body circumference set up, the axis body is used for being connected with rear wheel drive axle, the both sides of tooth portion are equipped with the bellying, the bellying is used for leaning on with rack and nut counterbalance.

Optionally, the tooth portion includes a first tooth, a second tooth and a third tooth that are arranged in sequence, and the two sides of the second tooth are provided with the protruding portion.

Optionally, the protrusion is an arc protrusion.

Optionally, the shaft body is provided with a first limiting block and a second limiting block, and the first limiting block and the second limiting block are respectively located on two sides of the tooth portion.

The utility model also discloses an electric power steering gear which comprises a shell, a worm gear, a screw rod, a rack nut and the output shaft sector structure, wherein the worm gear and the rack nut are sleeved on the screw rod, the worm gear, the screw rod and the rack nut are arranged in the shell, the tooth part is meshed with the rack nut, the shaft body is provided with a first limiting block and a second limiting block, the first limiting block and the second limiting block are respectively positioned at two sides of the tooth part, the first limiting block is arranged at one side of the shaft body close to the worm gear, and the inner side wall of the shell is provided with a first baffle which is in movable contact with the first limiting block.

Optionally, the second limiting block is arranged on one side, away from the worm wheel, of the shaft body, and a second baffle in movable contact with the second limiting block is arranged on the inner side wall of the shell.

Optionally, the rack nut has the first teeth of a cogwheel, the second teeth of a cogwheel, the third teeth that set gradually, a teeth of a cogwheel and first teeth of a cogwheel meshing, the second teeth of a cogwheel and second teeth of a cogwheel meshing, the third teeth of a cogwheel and third teeth of a cogwheel meshing.

Optionally, the shaft body is connected with a pull rod, the pull rod and the shaft body have a taper, the pull rod is provided with a taper hole, and the pull rod and the shaft body are in taper locking fit.

3. Advantageous effects

Compared with the prior art, the technical scheme provided by the utility model has the following beneficial effects:

(1) the output shaft sector gear structure that this application embodiment provided is applicable to the rear wheel and turns to, and the bellying has compensatied the gap between tooth portion and the rack nut, makes between tooth portion and the rack nut closely mesh, has increased the output torque of sector gear and rack nut, and then increases the stability of rear wheel, reduces the risk of automobile body drift.

(2) According to the output shaft sector gear structure provided by the embodiment of the application, the first limiting block is used for abutting against the first baffle of the shell, the second limiting block is used for abutting against the second baffle of the shell, the steering nut is prevented from moving excessively and colliding with the worm wheel or the bearing, and the electric power steering gear is ensured to work normally.

Drawings

Fig. 1 is a schematic structural diagram of an output shaft sector structure according to an embodiment of the present invention.

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

Fig. 3 is a schematic view of an electric power steering apparatus according to an embodiment of the present invention.

The labels in the various figures are: 1. a shaft body; 11. a first stopper; 12. a second limiting block; 2. a tooth portion; 21. a boss portion; 22. a first tooth; 23. a second tooth; 24. a third tooth; 3. a housing; 31. a first baffle plate; 32. a second baffle; 4. a worm gear; 5. a screw; 6. a rack nut; 61. a first gear tooth; 62. a second gear tooth; 63. a third gear tooth; 7. a pull rod.

Detailed Description

For a further understanding of the present invention, reference will now be made in detail to the embodiments illustrated in the drawings.

The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and are not limiting of the utility model. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings. The terms first, second, and the like in the present invention are provided for convenience of describing the technical solution of the present invention, and have no specific limiting effect, but are all generic terms, and do not limit the technical solution of the present invention. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular 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. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be 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 meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. The technical solutions in the same embodiment and the technical solutions in different embodiments can be arranged and combined to form a new technical solution without contradiction or conflict, and the technical solutions are within the scope of the present invention.

Example 1

With reference to fig. 1-3, the output shaft sector gear structure of this embodiment includes a shaft body 1 and a tooth portion 2 disposed along a circumferential direction of the shaft body 1, where the shaft body 1 is used for being connected to a rear wheel drive axle, and protruding portions 21 are disposed on two sides of the tooth portion 2, and the protruding portions 21 are used for abutting against a rack nut 6. The output shaft sector gear structure of this embodiment is applicable to the rear wheel and turns to, and bellying 21 has compensatied the gap between tooth portion 2 and the rack nut 6, makes closely mesh between tooth portion 2 and the rack nut 6, has increased sector gear and rack nut 6's output torque, and then increases the stability of rear wheel, reduces the risk of automobile body drift.

Example 2

With reference to fig. 1-3, compared with the technical solution of embodiment 1, the output shaft sector structure of the present embodiment can be improved as follows: the tooth part 2 comprises a first tooth 22, a second tooth 23 and a third tooth 24 which are arranged in sequence, and the two sides of the second tooth 23 are provided with the convex parts 21. When the screw 5 drives the rack nut 6 to move repeatedly, the second teeth 23 located in the middle of the tooth part 2 are in close contact with the gear teeth on the rack nut 6, and the protruding part 21 makes up a gap between the second teeth 23 and the rack nut 6, so that the second teeth 23 are in close engagement with the rack nut 6, and the stabilizing moment of the vehicle is increased.

Example 3

With reference to fig. 1-3, compared with the technical solution of embodiment 1 or 2, the output shaft fan-tooth structure of this embodiment can be improved as follows: the convex portion 21 is an arc-shaped protrusion. The arcuate projection further facilitates the mating abutment of the boss 21 with the rack nut 6.

Example 4

With reference to fig. 1 to 3, compared with any of the technical solutions of embodiments 1 to 3, the output shaft segment tooth structure of the present embodiment can be improved as follows: the shaft body 1 is provided with a first limiting block 11 and a second limiting block 12, and the first limiting block 11 and the second limiting block 12 are respectively located on two sides of the tooth portion 2. The first limiting block 11 is used for abutting against a first baffle 31 of the shell 3, and the second limiting block 12 is used for abutting against a second baffle 32 of the shell 3, so that the steering nut is prevented from excessively moving and colliding with the worm wheel 4 or a bearing, and the normal work of the electric power steering gear is ensured.

Example 5

With reference to fig. 1-3, the electric power steering device of this embodiment includes a housing 3, a worm wheel 4, a screw rod 5, a rack nut 6 and any one of technical solutions of embodiments 1-4, the worm wheel 4 and the rack nut 6 are all sleeved on the screw rod 5, the worm wheel 4, the screw rod 5 and the rack nut 6 are all disposed inside the housing 3, the tooth portion 2 is engaged with the rack nut 6, the first stopper 11 is disposed on one side of the shaft body 1 close to the worm wheel 4, and a first baffle 31 in movable contact with the first stopper 11 is disposed on an inner side wall of the housing 3. The worm drives worm wheel 4 to rotate, worm wheel 4 drives screw rod 5 to rotate, and the steering nut that the cover was established on screw rod 5 is reciprocating motion along screw rod 5, and when rack nut 6 was equipped with the one end motion of worm wheel 4 towards screw rod 5 cover, first stopper 11 supported and leaned on first baffle 31, prevented rack nut 6 excessive and worm wheel 4 bump of motion, ensured that electronic power assisted steering ware normally works.

Example 6

With reference to fig. 1 to 3, the electric power steering apparatus of the present embodiment can be improved as follows, compared with any of the embodiments 1 to 5: the second limiting block 12 is arranged on one side of the shaft body 1 far away from the worm wheel 4, and a second baffle 32 in movable contact with the second limiting block 12 is arranged on the inner side wall of the shell 3. One side of the shaft body 1, which is far away from the worm wheel 4, is close to the bearing, when the rack nut 6 moves towards one end, which is sleeved with the bearing, of the screw rod 5, the second limiting block 12 is abutted against the second baffle 32, so that the rack nut 6 is prevented from moving excessively to collide with the bearing, and the normal work of the electric power steering gear is ensured.

Example 7

With reference to fig. 1 to 3, the electric power steering apparatus of the present embodiment can be improved as follows, compared with any of the embodiments 1 to 6: the rack nut 6 is provided with a first gear 61, a second gear 62 and a third gear 63 which are arranged in sequence, the first gear is meshed with the first gear 22, the second gear 62 is meshed with the second gear 23, and the third gear 63 is meshed with the third gear 24.

Example 8

With reference to fig. 1 to 3, the electric power steering apparatus of the present embodiment can be improved as follows, compared with any of the embodiments 1 to 7: the shaft body is connected with a pull rod 7, the pull rod 7 and the shaft body have taper, the pull rod 7 is provided with a taper hole, and the pull rod 7 and the shaft body are in taper locking fit. The pull rod is connected with the rear wheel drive axle. The connection part of the shaft body and the pull rod 7 is provided with taper, so that the shaft body and the pull rod 7 are in locking fit; and the spline is arranged at the tapered position, so that the connection between the pull rod 7 and the shaft body is ensured not to be loosened, one end of the shaft body is conveniently pushed into the taper hole, and the condition that the pull rod is particularly difficult to be matched is avoided.

The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the utility model, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the utility model.

Claims (8)

1. The utility model provides an output shaft fan-tooth structure, its characterized in that includes the axis body and follows the tooth portion that axis body circumference set up, the axis body is used for being connected with rear wheel drive axle, the both sides of tooth portion are equipped with the bellying, the bellying is used for leaning on with rack and nut counterbalance.

2. The output shaft scalloping structure according to claim 1, wherein the toothed portion comprises a first tooth, a second tooth and a third tooth arranged in sequence, and the protruding portion is provided on both sides of the second tooth.

3. The output shaft scalloping structure according to claim 1, wherein the projections are arcuate projections.

4. The output shaft scalloped structure of claim 1, wherein the shaft body has a first stop and a second stop, the first stop and the second stop being located on either side of the toothed portion.

5. An electric power steering gear is characterized by comprising a shell, a worm wheel, a screw rod, a rack nut and the output shaft sector structure of any one of claims 1 to 4, wherein the worm wheel and the rack nut are sleeved on the screw rod, the worm wheel, the screw rod and the rack nut are arranged inside the shell, the tooth part is meshed with the rack nut, the shaft body is provided with a first limiting block and a second limiting block, the first limiting block and the second limiting block are respectively positioned on two sides of the tooth part, the first limiting block is arranged on one side, close to the worm wheel, of the shaft body, and a first baffle in movable contact with the first limiting block is arranged on the inner side wall of the shell.

6. The electric power steering gear according to claim 5, wherein the second stopper is disposed on a side of the shaft body away from the worm wheel, and a second baffle movably contacting with the second stopper is disposed on an inner side wall of the housing.

7. The electric power steering gear according to claim 5, wherein the rack nut has a first gear tooth, a second gear tooth, and a third gear tooth arranged in this order, the first gear tooth being engaged with the first gear tooth, the second gear tooth being engaged with the second gear tooth, and the third gear tooth being engaged with the third gear tooth.

8. The electric power steering gear according to claim 5, wherein the shaft body is connected with a pull rod, the pull rod and the shaft body are provided with taper, the pull rod is provided with a taper hole, and the pull rod and the shaft body are in taper locking fit.

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