Integrated ball nut of automobile steering engine

Abstract

The utility model relates to the technical field of automobile steering machines, in particular to an integrated ball nut of an automobile steering machine, which comprises a ball nut body, a raceway is arranged on an inner ring of the ball nut body, a bearing inner ring and a tooth-shaped structure are integrated on an outer ring of the ball nut body, a circle of groove is arranged on the outer surface of the bearing inner ring, and the groove is matched with a bearing ball. The two sides of the tooth-shaped structure are each provided with a circle of axial limiting boss, the tooth-shaped structure is matched with the tooth shape of the inner surface of the transmission belt, and the axial limiting bosses abut against the two sides of the transmission belt. Compared with the prior art, the characteristics and functions of the bearing inner ring and the large belt wheel are integrated on the ball nut, parts are reduced, and higher transmission efficiency is achieved; the assembly process is simplified, the production takt of a production line is improved, the cost is reduced, the problem of unqualified assembly caused by a plurality of procedures is also avoided, and the qualification rate of the production line is improved; the overall outer diameter of the steering engine is reduced, the arrangement space is increased, and the steering engine can be flexibly arranged on the whole vehicle.

Description

Technical Field

[0001] The utility model relates to the technical field of automotive steering gears, and specifically relates to an integrated ball nut for an automotive steering gear. Background Art

[0002] During the driving of an automobile, when the driver turns the steering wheel, the motor torque is transmitted to the large pulley through the small pulley and the transmission belt. The large pulley and the bearing are assembled to the outer ring of the ball nut through interference fit, and the axial fixation of the bearing and the large pulley is realized through the lock nut. The large pulley drives the ball nut, the lock nut and the inner ring of the bearing to rotate together. The inner ring of the ball nut is designed with a raceway filled with balls. The ball nut drives the balls to rotate, and the balls drive the rack to move axially, so as to realize the normal driving steering function of the automobile.

[0003] Automotive steering gears belong to automotive safety components. The existing ball nuts need to cooperate with parts such as large pulleys and bearings. The cumbersome parts assembly process will increase the unqualified rate of production line production and increase the production rhythm of the production line; the cooperation of too many parts is likely to generate gaps due to dimensional problems, resulting in noise problems; the cumbersome structure design leads to a relatively large overall structure, which is not conducive to the flexible layout of the steering gear in the whole vehicle.

[0004] Therefore, it is necessary to design an integrated ball nut for an automotive steering gear to integrate the functions of different parts, make the structure of the steering gear simpler, reduce the production line assembly process, and improve the production rhythm and qualification rate of the production line. Summary of the Invention

[0005] The purpose of the utility model is to overcome the deficiencies of the prior art, and provides an integrated ball nut for an automotive steering gear to integrate the functions of different parts, make the structure of the steering gear simpler, reduce the production line assembly process, and improve the production rhythm and qualification rate of the production line.

[0006] To achieve the above purpose, the utility model is an integrated ball nut for an automotive steering gear, which includes a ball nut body. The inner ring of the ball nut body has a raceway. The outer ring of the ball nut body is integrated with an inner ring of a bearing and a tooth-shaped structure. The outer surface of the inner ring of the bearing is provided with a groove, and the groove matches the bearing balls. Both sides of the tooth-shaped structure are respectively provided with a circle of axial limiting bosses, and the tooth-shaped structure matches the inner surface tooth shape of the transmission belt, and the axial limiting bosses abut against both sides of the transmission belt.

[0007] The ball nut body is sleeved outside the rack, and several balls are arranged between the rack and the ball nut body, and the balls are located in the raceway.

[0008] The outer ring of the bearing is sleeved outside the inner ring of the bearing, and bearing balls are arranged between the inner ring of the bearing and the outer ring of the bearing. The bearing balls are located in the groove, and the outer ring of the bearing is fixed between the long shell and the shell end cover.

[0009] The described tooth-shaped structure is connected to the small pulley at the end of the motor shaft by a transmission belt.

[0010] The described tooth-shaped structure meshes with the inner surface of the transmission belt.

[0011] The small pulley and the motor shaft are in interference fit.

[0012] Compared with the prior art, the present utility model integrates the features and functions of the inner ring of the bearing and the large pulley onto the ball nut, reducing the number of parts and achieving higher transmission efficiency; simplifies the assembly process, improves the production beat of the production line, reduces costs, and also avoids the problem of unqualified assembly caused by multiple processes, improving the qualification rate of the production line; reduces the overall outer diameter size of the steering gear, increases the layout space, and helps the steering gear to be flexibly arranged in the whole vehicle; eliminates the lock nut and solves the problem of noise generated after its loosening. Brief Description of the Drawings

[0013] Figure 1 It is a structural schematic diagram of the present utility model.

[0014] Figure 2 It is a usage state diagram of the present utility model. Detailed Description of the Preferred Embodiment

[0015] Now, the present utility model will be further described in conjunction with the accompanying drawings.

[0016] Refer to Figure 1 , the present utility model is an integrated ball nut for an automotive steering gear, including a ball nut body. The inner ring of the ball nut body 1 has a raceway 11. The outer ring of the ball nut body 1 is integrated with an inner ring 2 of a bearing and a tooth-shaped structure 3. The outer surface of the inner ring 2 of the bearing is provided with a ring of grooves 21, and the grooves 21 match the bearing balls 7. Both sides of the tooth-shaped structure 3 respectively have a ring of axial limiting bosses 31. The tooth-shaped structure 3 matches the tooth shape of the inner surface of the transmission belt 4, and the axial limiting bosses 31 abut against both sides of the transmission belt 4. The axial limiting bosses 31 avoid the risk of the transmission belt 4 falling off during the assembly and movement processes.

[0017] Integrating the inner ring 2 of the bearing and the tooth-shaped structure 3 on the ball nut body 1 eliminates the need for a lock nut to axially fix the bearing and the large pulley, streamlining the number of parts and the structure. One part of the integrated ball nut realizes the functions of the large pulley, the inner ring of the bearing, and the lock nut, and simplifies the production and assembly process, improving the production beat of the production line.

[0018] Refer to Figure 2 , the ball nut body 1 is sleeved outside the rack 5, and several balls 6 are provided between the rack 5 and the ball nut body 1. The balls 6 are located in the raceway 11.

[0019] The inner ring 2 of the bearing is externally sleeved with an outer ring 8 of the bearing. There is a bearing ball 7 between the inner ring 2 of the bearing and the outer ring 8 of the bearing. The bearing ball 7 is located in the groove 21. The outer ring 8 of the bearing is fixed between the long housing 10 and the housing end cover 9.

[0020] The tooth-shaped structure 3 is connected to the small pulley at the end of the motor shaft by a transmission belt 4. The tooth-shaped structure 3 meshes with the inner surface of the transmission belt 4. The small pulley and the motor shaft are in interference fit.

[0021] When the utility model works, the torque of the motor is transmitted to the small pulley. The small pulley 5 drives the transmission belt 4 to rotate. The transmission belt 4 drives the ball nut body 1 to rotate through the tooth-shaped structure 3, thereby driving the ball 6 to rotate. The rotation of the ball 6 drives the rack 5 to move axially, realizing the transmission of the torque of the motor to the rack 5.

[0022] The utility model integrates the features and functions of the inner ring of the bearing and the large pulley onto the ball nut, reducing parts and achieving higher transmission efficiency; simplifies the assembly process, improves the production beat of the production line, reduces costs, and also avoids the problem of unqualified assembly caused by multiple processes, improving the qualification rate of the production line; reduces the overall outer diameter size of the steering gear, increases the layout space, and helps the steering gear to be flexibly arranged in the whole vehicle; cancels the locking nut and solves the problem of noise generated after its loosening.

Claims

1. An integrated ball nut for a vehicle steering gear, comprising a ball nut body, characterized in that: The inner ring of the ball nut body (1) has a raceway (11), the outer ring of the ball nut body (1) is integrated with a bearing inner ring (2) and a toothed structure (3), the outer surface of the bearing inner ring (2) is provided with a circle of grooves (21), the grooves (21) match the bearing balls (7), the two sides of the toothed structure (3) are respectively provided with a circle of axial limiting bosses (31), the toothed structure (3) matches the toothed shape of the inner surface of the transmission belt (4), and the axial limiting bosses (31) abut against the two sides of the transmission belt (4).

2. The integrated ball nut for automobile steering gear according to claim 1, characterized in that: The ball nut body (1) is sleeved outside the rack (5), a plurality of balls (6) are arranged between the rack (5) and the ball nut body (1), and the balls (6) are located in the raceway (11).

3. The integrated ball nut for automobile steering gear according to claim 1, characterized in that: The bearing inner ring (2) is provided with a bearing outer ring (8) on its outer sleeve, a bearing ball (7) is provided between the bearing inner ring (2) and the bearing outer ring (8), the bearing ball (7) is located in the groove (21), and the bearing outer ring (8) is fixed between the long housing (10) and the housing end cover (9).

4. The integrated ball nut for automobile steering gear according to claim 1, characterized in that: The toothed structure (3) is connected to the small pulley at the end of the motor shaft by a transmission belt (4).

5. The integrated ball nut for automobile steering gear according to claim 4, characterized in that: The toothed structure (3) meshes with the inner surface of the transmission belt (4).

6. The integrated ball nut for automobile steering gear according to claim 4, characterized in that: The small pulley and the motor shaft are in interference fit.

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