CN221541707U - Worm wheel gear steering power assisting mechanism, steering power assisting device and automobile - Google Patents

Abstract

The utility model relates to the technical field of vehicle steering, and provides a worm gear steering power assisting mechanism, a steering power assisting device and an automobile, wherein the worm gear steering power assisting mechanism comprises: a worm wheel and a booster gear shaft; the axial center of the worm wheel is provided with a shaft hole, and the outer circumferential surface of the worm wheel is provided with a first gear tooth for transmission connection with the worm; the power-assisted gear shaft comprises a first shaft body and a second shaft body which are connected with each other, and the first shaft body is at least partially inserted into the shaft hole and is in interference fit with the shaft hole; the second gear teeth are formed on the circumferential outer side of the second shaft body and are used for being in transmission connection with the steering gear. According to the worm gear steering power assisting mechanism, through interference fit of the shaft hole and the first shaft body, pressure and friction between the inner wall of the shaft hole and the outer peripheral surface of the first shaft body are improved, so that the worm gear and the power assisting gear shaft can not slip when transmitting larger torque, and the problem that in the prior art, a tolerance ring can slip, so that torque transmitted by a power assisting unit is limited is effectively solved.

Description

Worm wheel gear steering power assisting mechanism, steering power assisting device and automobile

Technical Field

The utility model relates to the technical field of vehicle steering, in particular to a worm gear steering power assisting mechanism, a steering power assisting device and an automobile.

Background

In the related art, a power assisting unit of an electric power steering machine of an automobile adopts a worm, a worm wheel and a power assisting gear shaft to mutually cooperate to transmit torque, and specifically, the worm and the worm wheel are connected through gear transmission; the worm wheel and the power-assisted gear shaft are connected in a matched mode through the tolerance ring, when the load moment is too large, the tolerance ring can slip, and therefore the torque transmitted by the power-assisted unit is limited.

Disclosure of utility model

The utility model provides a worm gear steering power assisting mechanism, a steering power assisting device and an automobile, which are used for solving the problem that in the prior art, a tolerance ring can slip, so that the torque transmitted by a power assisting unit is limited.

In a first aspect, the present utility model provides a worm gear steering assist mechanism comprising:

The axial center of the worm wheel is provided with a shaft hole, and the outer circumferential surface of the worm wheel is provided with first gear teeth for being in transmission connection with a worm;

The power-assisted gear shaft comprises a first shaft body and a second shaft body which are connected with each other, and the first shaft body is at least partially inserted into the shaft hole and is in interference fit with the shaft hole; the second gear teeth are formed on the outer side of the circumference of the second shaft body and are used for being in transmission connection with the steering gear.

The worm gear steering power assisting mechanism further comprises a stop piece; the outer peripheral surface of the first shaft body is provided with a protruding part;

The protruding part is abutted against one side of the worm wheel; the stop piece is detachably arranged on the outer peripheral surface of the first shaft body and is abutted against the other side of the worm wheel.

According to the worm gear steering assist mechanism of the present utility model, the boss is circumferentially formed around the outer peripheral surface of the assist gear shaft.

According to the worm gear steering power assisting mechanism, the stop piece is the clamping spring, the clamping groove is formed in the outer peripheral surface of the first shaft body, corresponding to the edge position of the worm gear, and the clamping spring is clamped in the clamping groove.

According to the worm gear steering assist mechanism of the utility model, the outer peripheral surface of the first shaft body is provided with a friction surface corresponding to the position of the shaft hole.

According to the worm gear steering power assisting mechanism, the position, corresponding to the shaft hole, of the outer peripheral surface of the first shaft body is covered with the friction material coating.

According to the worm gear steering power assisting mechanism, the worm gear is a nylon worm gear.

According to the worm gear steering power assisting mechanism, the shaft hole is a cylindrical hole, and the first shaft body is a cylindrical shaft body matched with the shaft hole.

In a second aspect, the present utility model also provides a steering assist device including:

a worm gear steering assist mechanism as claimed in any one of the above;

The output end of the driving piece is connected with the worm in a transmission mode, third gear teeth matched with the first gear teeth are arranged on the worm, and the worm is connected with the worm wheel in a transmission mode through the third gear teeth and the first gear teeth.

In a third aspect, the utility model also provides a motor vehicle comprising a steering assist device as claimed in the utility model.

According to the worm wheel and gear steering power assisting mechanism, the worm wheel is matched with the worm to rotate and transmit torque under the driving of the worm; the worm wheel is in interference fit with the power-assisted gear shaft, so that the worm wheel can drive the power-assisted gear shaft to rotate so as to transmit torque to the power-assisted gear shaft, and the torque is transmitted to the steering gear through the power-assisted gear shaft, thereby realizing steering; through the interference fit of shaft hole and first axis body, improved pressure and frictional force between shaft hole inner wall and the first axis outer peripheral face, can not skid when making worm wheel and helping hand gear shaft can transmit bigger moment, effectively solved among the prior art tolerance ring and can take place to skid, lead to the limited problem of moment of helping hand unit transmission.

Drawings

In order to more clearly illustrate the utility model or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural view of a worm gear steering assist mechanism according to an embodiment of the present utility model.

Reference numerals:

1. a worm gear steering assist mechanism;

11. A worm wheel; 111. a shaft hole; 112. a first gear tooth; 113. a clamping groove;

12. a power-assisted gear shaft; 121. a first shaft body; 122. a second shaft body; 123. a second gear tooth; 124. a boss;

13. a stop.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, the technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the embodiments of the present utility model, it should be noted that, directions or positional relationships indicated by terms such as "upper", "lower", "front", "rear", "inner", "outer", etc., are based on directions or positional relationships shown in the drawings, are merely for convenience of describing the embodiments of the present utility model and simplifying the description, and do not indicate or imply that the devices or elements to be referred to must have a specific direction, be configured and operated in the specific direction, and thus should not be construed as limiting the embodiments of the present utility model. 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 utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

The worm wheel gear steering assist mechanism provided by the utility model is described below with reference to fig. 1.

As shown in fig. 1, a worm gear steering assist mechanism 1 according to the present utility model includes: a worm wheel 11 and a booster gear shaft 12; the axial center of the worm wheel 11 is provided with a shaft hole 111, and the outer circumferential surface of the worm wheel 11 is provided with a first gear tooth 112 for transmission connection with a worm; the booster gear shaft 12 comprises a first shaft body 121 and a second shaft body 122 which are connected with each other, wherein the first shaft body 121 is at least partially inserted into the shaft hole 111 and is in interference fit with the shaft hole 111; the second shaft body 122 is formed with second gear teeth 123 on the circumferential outer side for driving connection with the steering gear.

In the present embodiment, the outer peripheral surface of the worm wheel 11 is configured with first gear teeth 112 to be in driving connection with the worm, so as to be rotated by the drive of the worm to transmit torque; the worm wheel 11 is provided with a shaft hole 111, the shaft hole 111 is in interference fit with the first shaft body 121 of the power-assisted gear shaft 12, the inner wall of the shaft hole 111 and the outer peripheral surface of the first shaft body 121 are mutually abutted and extruded, and as the inner wall of the shaft hole 111 applies pressure to the outer peripheral surface of the first shaft body 121, friction force is generated on the outer peripheral surface of the first shaft body 121 when the worm wheel 11 rotates so as to drive the power-assisted gear shaft 12 to synchronously rotate, and the transmission of torque and axial force is realized; the power assist gear shaft 12 can then transmit torque to the steering gear via the second gear teeth 123 to effect steering.

The worm wheel and gear steering power assisting mechanism 1 is driven by a worm to rotate and transmit torque through the cooperation of the worm wheel 11 and the worm; the worm wheel 11 is in interference fit with the power-assisted gear shaft 12, so that the worm wheel 11 can drive the power-assisted gear shaft 12 to rotate so as to transmit torque to the power-assisted gear shaft 12, and the power-assisted gear shaft 12 is used for transmitting the torque to the steering gear, so that steering is realized; through the interference fit of shaft hole 111 and first axis body 121, improved pressure and frictional force between the inner wall of shaft hole 111 and the outer peripheral face of first axis body 121, can not skid when making worm wheel 11 and helping hand gear shaft 12 can transmit bigger moment, effectively solved among the prior art tolerance ring and can take place to skid, lead to the limited problem of moment of helping hand unit transmission.

Specifically, when the first shaft body 121 is inserted into the shaft hole 111, the outer circumferential surface of the first shaft body 121 may be first heat-treated to obtain a high-hardness surface layer and favorable internal stress distribution, so as to improve wear resistance and fatigue resistance of the outer circumferential surface of the first shaft body 121.

Meanwhile, during assembly, a tolerance piece is not needed, and only the worm wheel 11 and the power-assisted gear shaft 12 are required to be installed in an interference fit mode, so that assembly procedures, equipment, manpower and the like are reduced, and the production and manufacturing cost of the whole mechanism can be effectively reduced.

In some embodiments, as shown in fig. 1, the worm gear steering assist mechanism 1 further includes a stopper 13; the outer peripheral surface of the first shaft body 121 is configured with a boss 124; the boss 124 abuts against one side of the worm wheel 11; the stopper 13 is detachably provided on the outer peripheral surface of the first shaft body 121, and abuts against the other side of the worm wheel 11.

In this embodiment, the stop member 13 and the protruding portion 124 are respectively abutted against two sides of the worm wheel 11, so as to limit the worm wheel 11, thereby avoiding the worm wheel 11 from axially sliding relative to the first shaft body 121 and affecting the stability of the whole structure; meanwhile, the stop piece 13 is detachably arranged on the first shaft body 121, when the worm wheel 11 is sleeved on the first shaft body 121, the stop piece 13 can be detached from the first shaft body 121, one end of the first shaft body 121, which is far away from the protruding portion 124, is pressed into the shaft hole 111, and when the worm wheel 11 abuts against the protruding portion 124, the stop piece 13 is mounted on the other side of the worm wheel 11, so that the stop piece 13 abuts against the other side of the worm wheel 11, and the installation of the worm wheel 11 and the booster gear shaft 12 is more convenient.

In some embodiments, as shown in fig. 1, the boss 124 is circumferentially configured around the outer peripheral surface of the assist gear shaft 12.

In this embodiment, the protruding portion 124 is annular, and is configured on the outer peripheral surface of the power-assisted gear shaft 12, so that the contact surface between the protruding portion and the worm wheel 11 is larger, the stress of the worm wheel 11 is more uniformly dispersed, the limiting effect on the worm wheel 11 is better, and the structure is more stable.

In some embodiments, as shown in fig. 1, the stopper 13 is a snap spring, and the outer peripheral surface of the first shaft body 121 is configured with a clamping groove 113 corresponding to the edge position of the worm wheel 11, and the snap spring is clamped in the clamping groove 113.

In this embodiment, by forming the clamping groove 113 on the first shaft body 121, when the clamping spring is clamped in the clamping groove 113, the clamping spring is abutted against the worm wheel 11, and the matching protruding portion 124 limits the worm wheel 11, so that the worm wheel 11 is prevented from sliding axially relative to the power-assisted gear shaft 12; the snap spring can be quickly assembled and disassembled in the clamping groove 113, and is simple in structure and convenient to use.

In some embodiments, the outer circumferential surface of the first shaft body 121 is configured with a friction surface corresponding to the position of the shaft hole 111.

In the present embodiment, by configuring the friction surface on the outer peripheral surface of the first shaft body 121 to increase the friction coefficient between the first shaft body 121 and the outer peripheral surface and the inner wall of the shaft hole 111, the friction force between the first shaft body 121 and the shaft hole 111 is increased, and the torque transmittable between the worm wheel 11 and the assist gear shaft 12 is further improved.

Optionally, in some embodiments, the outer circumferential surface of the first shaft body 121 is covered with a friction material coating at a position corresponding to the shaft hole 111.

In the present embodiment, by coating the outer peripheral surface of the first shaft body 121 with a friction material coating, the friction coefficient between the first shaft body 121 and the outer peripheral surface and the inner wall of the shaft hole 111 is further increased, and the torque transmittable between the worm wheel 11 and the assist gear shaft 12 is further improved.

Specifically, the worm wheel 11 may be a nylon worm wheel. The nylon worm wheel has good wear resistance, can reduce friction and abrasion in the process of transmitting torque, and prolongs the service life of the whole mechanism. Meanwhile, the nylon worm wheel has good sound absorption and damping characteristics, and noise and vibration of the whole mechanism during operation are reduced.

Specifically, nylon worm wheel can adopt integrative injection molding, and production is easy, and bulk strength is high.

Specifically, in some embodiments, the shaft hole 111 is a cylindrical hole, and the first shaft body 121 is a cylindrical shaft body that fits into the shaft hole 111.

In this embodiment, the cylindrical shaft body is inserted into the shaft hole 111, the inner wall of the cylindrical hole and the outer circumferential surface of the cylindrical shaft body are abutted against each other and form an interference fit, the inner wall of the cylindrical hole and the outer circumferential surface of the cylindrical shaft body are mutually pressed, and when the two are rotated relatively, the pressure between the two generates friction force to each other, thereby realizing the transmission of torque and axial force, and the structure is simple and easy to produce.

In a second aspect, the present utility model also provides a steering assist device including: the driving piece, the worm and the worm gear steering power assisting mechanism 1 provided by any embodiment; the output end of the driving piece is in transmission connection with a worm, a third gear tooth matched with the first gear tooth 112 is arranged on the worm, and the worm is in transmission connection with the worm wheel 11 through the third gear tooth and the first gear tooth 112.

By adopting the worm gear steering assist mechanism 1 of the above embodiment, the steering assist device of the present utility model also has the advantages of the worm gear steering assist mechanism 1 described above, and will not be described in detail herein. The driving member can drive the worm to rotate, the worm drives the worm wheel 11 to rotate through the third gear teeth and the first gear teeth 112, and the worm wheel 11 drives the power-assisted gear shaft 12 to rotate through interference fit with the shaft hole 111 and the first shaft body 121, so that torque is transmitted, and steering is completed.

In general, the power-assisted gear shaft 12 is in driving connection with the steering gear through the second gear teeth 123 to drive the steering gear to move, so as to complete steering.

In particular, the driving member may be a driving motor.

In a third aspect, the present utility model also provides an automobile, including the steering assist device of the above embodiment. By adopting the steering assist device of the above embodiment, the automobile of the present utility model also has the advantages of the steering assist device described above, and will not be described in detail herein.

It is understood that the vehicle may be, but is not limited to, a fuel-powered vehicle, a hybrid vehicle, a new energy vehicle, etc.

The above-described embodiments are merely illustrative, and some or all of the modules may be selected according to actual needs to achieve the purpose of the embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims (9)

1. A worm gear steering assist mechanism, comprising:

The axial center of the worm wheel is provided with a shaft hole, and the outer circumferential surface of the worm wheel is provided with first gear teeth for being in transmission connection with a worm;

The power-assisted gear shaft comprises a first shaft body and a second shaft body which are connected with each other, and the first shaft body is at least partially inserted into the shaft hole and is in interference fit with the shaft hole; the second gear teeth are formed on the outer side of the circumference of the second shaft body and are used for being in transmission connection with the steering gear; the outer peripheral surface of the first shaft body is provided with a protruding part; the protruding part is abutted against one side of the worm wheel;

The stop piece is detachably arranged on the outer circumferential surface of the first shaft body and is abutted against the other side of the worm wheel.

2. The worm gear steering assist mechanism as recited in claim 1, wherein the boss is circumferentially formed around an outer peripheral surface of the assist gear shaft.

3. The worm gear steering assist mechanism as set forth in claim 1, wherein the stopper is a snap spring, and a clamping groove is formed in the outer peripheral surface of the first shaft body at a position corresponding to the edge of the worm gear, and the snap spring is clamped in the clamping groove.

4. A worm gear steering assist mechanism according to any one of claims 1 to 3, wherein a friction surface is formed on an outer peripheral surface of the first shaft body at a position corresponding to the shaft hole.

5. A worm gear steering assist mechanism as set forth in any one of claims 1 to 3 wherein the outer peripheral surface of the first shaft body is covered with a friction material coating at a position corresponding to the shaft hole.

6. A worm gear steering assist mechanism as claimed in any one of claims 1 to 3 wherein the worm gear is a nylon worm gear.

7. A worm gear steering assist mechanism as set forth in any one of claims 1 to 3 wherein said shaft bore is a cylindrical bore and said first shaft body is a cylindrical shaft body adapted to said shaft bore.

8. A steering assist device characterized by comprising:

a worm gear steering assist mechanism as claimed in any one of claims 1 to 7;

The output end of the driving piece is connected with the worm in a transmission mode, third gear teeth matched with the first gear teeth are arranged on the worm, and the worm is connected with the worm wheel in a transmission mode through the third gear teeth and the first gear teeth.

9. An automobile comprising the steering assist device according to claim 8.