Gear shifting executing mechanism of automobile transfer case

Abstract

The utility model provides a gear shifting executing mechanism of an automobile transfer case, and belongs to the technical field of machinery. The gear shifting executing mechanism solves the problems that the supporting effect of an existing gear shifting executing mechanism for the automobile transfer case on a worm is not ideal, and the worm is prone to deformation. The gear shifting executing mechanism of the automobile transfer case comprises a gear box and a motor, the gear box comprises a box body and a worm gear axially and fixedly connected into the box body, the motor comprises a shell, a stator, a rotor and a rotating shaft, the shell of the motor is fixedly connected with one end of the box body, and a worm part is arranged at the outer end of the rotating shaft and meshed with the worm gear. A copper sleeve is arranged between the outer end of the rotating shaft and the box body and located on the outer side of the worm part, and the inner side wall and the outer side wall of the copper sleeve abut against the outer side wall of the rotating shaft and the inner side wall of the box body respectively. The gear shifting executing mechanism of the automobile transfer case has the advantages of being good in rotating shaft supporting effect, reliable and stable in work and compact in structure.

Description

Technical Field

[0001] The utility model belongs to the technical field of machinery and relates to an automobile transfer case, in particular to a shift execution mechanism of the automobile transfer case. Background Art

[0002] The transfer case is a power distribution device used in automobiles and is widely used in off-road vehicles. With increasing demands for operator comfort, handle-operated mechanical transfer cases are gradually being phased out, while electronically controlled transfer cases are becoming increasingly popular. The shift actuator in an electronically controlled transfer case is one of the key components that enables electronic shifting. It consists of a drive motor, a reduction gearbox, and an encoder. Their functions are as follows: the drive motor serves as the power source; the reduction gearbox reduces speed, increases torque, and outputs power, and is connected to the transfer case's shift shaft; and the encoder provides feedback on the gear position.

[0003] For example, a worm gear shift drive device driven by a brushless DC motor (application number: 202123113594.1) is disclosed in a Chinese patent document. A rotor worm shaft is axially installed at the center of the housing of the motor body, a worm gear is provided at the left end of the rotor worm shaft, and the worm gear is meshed with the worm gear to connect the worm wheel. The reducer housing is provided below the worm gear of the rotor worm shaft on the left side of the motor body. A reducer cover is provided on the worm wheel shaft head inside the outer end of the reducer housing through a ball bearing. A wave washer 2 is provided in the connection space between the reducer cover and the worm wheel shaft head. A shift finger is radially installed on the other end of the worm wheel shaft through an elastic limit pin. However, the worm gear shift drive device driven by a brushless DC motor has the problem that the support effect of the worm is not ideal and the worm is easily deformed. Summary of the Invention

[0004] The purpose of the utility model is to solve the above problems in the existing technology and to propose a shift actuator for an automobile transfer case which has good supporting effect on the rotating shaft, reliable and stable operation and compact structure.

[0005] The purpose of the utility model can be achieved through the following technical solutions: a shift actuator of a car transfer case, comprising a gear box and a motor, the gear box comprising a case body and a worm gear axially fixed in the case body, the motor comprising a housing, a stator, a rotor, and a rotating shaft, the housing of the motor being fixed to one end of the case body, the outer end of the rotating shaft having a worm portion and the worm portion meshing with the worm gear, characterized in that a copper sleeve is provided between the outer end of the rotating shaft and the case body, the copper sleeve being located on the outside of the worm portion, the inner and outer side walls of the copper sleeve respectively abutting against the outer side wall of the rotating shaft and the inner side wall of the case body.

[0006] Since a copper sleeve is provided between the outer end of the rotating shaft and the box body, the support for the rotating shaft is improved and the rotating shaft can rotate smoothly, which can reduce the deformation of the worm part and avoid the phenomenon of motor jamming caused by excessive engagement of the worm part and the worm wheel. It can be reset normally by reversing the motor, and has the advantages of reliable and stable operation and compact structure.

[0007] In the above-mentioned shift actuator of the automobile transfer case, a positioning groove is set at the outer end of the rotating shaft, a ball is embedded in the positioning groove, the outer end of the ball protrudes from the outer end surface of the rotating shaft, and a plug is threadedly connected to the box body and the plug is pressed against the ball.

[0008] In the aforementioned shift actuator for a transfer case of an automobile, a commutator is disposed within the housing and is connected to the rotating shaft. By providing the commutator, the rotating shaft of the motor can be reversed to restart the motor, thereby achieving the advantages of simple structure and reliable operation.

[0009] In the aforementioned automotive transfer case shift actuator, an oil-retaining bearing is disposed between the central portion of the rotating shaft and the case, with the inner and outer sidewalls of the oil-retaining bearing respectively abutting the outer sidewall of the rotating shaft and the inner sidewall of the case. The oil-retaining bearing disposed between the central portion of the rotating shaft and the case enhances support for the rotating shaft.

[0010] In the aforementioned automotive transfer case shift actuator, a spherical bearing is disposed between the other end of the rotating shaft having the worm portion and the housing. A second positioning groove is provided on the inner end of the housing, matching the spherical bearing, and the spherical bearing is embedded in the second positioning groove. This arrangement provides a better positioning effect for the rotating shaft and enables smooth rotation of the rotating shaft.

[0011] In the above-mentioned shift actuator of the automobile transfer case, a shaft shoulder is provided in the case body and the outer end of the copper sleeve abuts against the end surface of the shaft shoulder. The outer end of the copper sleeve abuts against the shaft shoulder, which has a good positioning effect on the shaft sleeve.

[0012] In the aforementioned automotive transfer case shift actuator, the outer end ring of the copper sleeve is provided with an arcuate protrusion, and the inner end surface of the case is provided with an arcuate groove that matches the arcuate protrusion. The arcuate protrusion is embedded in the arcuate groove, and an oil film is formed between the arcuate groove and the arcuate protrusion. This arrangement ensures good axial positioning between the copper sleeve and the case, and enhances support for the rotating shaft.

[0013] Compared with the prior art, the shift actuator of the automobile transfer case has the following advantages:

[0014] 1. Since a copper sleeve is provided between the outer end of the rotating shaft and the housing, the support for the rotating shaft is improved and the rotating shaft can rotate smoothly, which can reduce the deformation of the worm part and avoid the phenomenon of motor jamming caused by excessive engagement between the worm part and the worm wheel. The motor can be reset normally by reversing the motor, which has the advantages of reliable and stable operation and compact structure.

[0015] 2. The above-mentioned oil-containing bearing is provided between the middle part of the rotating shaft and the box body to improve the supporting effect of the rotating shaft;

[0016] 3. The inner end of the shell is provided with a second positioning groove that matches the spherical bearing. The spherical bearing is embedded in the second positioning groove, so that the shaft has a better positioning effect and can rotate smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a front view of the shift actuator of the transfer case of this automobile.

[0018] Figure 2 It is a cross-sectional view of the shift actuator of the transfer case of this automobile.

[0019] Figure 3 It is a cross-sectional view of another embodiment of the shift actuator of the transfer case of the automobile.

[0020] In the figure, 1, gearbox; 1a, housing; 1b, shoulder; 1c, arc-shaped groove; 2, worm gear; 3, motor; 3a, housing; 3b, stator; 3c, rotor; 3d, shaft; 3e, worm part; 3f, positioning groove; 4, copper sleeve; 4a, arc-shaped protrusion; 5, ball; 6, plug; 7, commutator; 8, oil-containing bearing; 9, spherical bearing; 10, positioning groove 2. DETAILED DESCRIPTION

[0021] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0022] like Figure 1 and 2 As shown, the shift actuator of the automobile transfer case includes a gearbox 1 and a motor 3. The gearbox 1 includes a housing 1a and a worm gear 2 axially fixedly connected to the housing 1a. The motor 3 includes a housing 3a, a stator 3b, a rotor 3c, and a rotating shaft 3d. The housing 3a of the motor 3 is fixedly connected to one end of the housing 1a. A commutator 7 is provided in the housing 3a and the commutator 7 is connected to the rotating shaft 3d.

[0023] The outer end of the rotating shaft 3d has a worm portion 3e, which meshes with the worm wheel 2. A copper sleeve 4 is positioned between the outer end of the rotating shaft 3d and the housing 1a. The sleeve 4 is located outside the worm portion 3e, with its inner and outer walls resting against the outer wall of the rotating shaft 3d and the inner wall of the housing 1a, respectively. A positioning groove 3f is defined at the outer end of the rotating shaft 3d, and a ball 5 is embedded within the positioning groove 3f. The outer end of the ball 5 protrudes from the outer end surface of the rotating shaft 3d. A plug 6 is threadedly connected to the housing 1a, pressing against the ball 5.

[0024] An oil-containing bearing 8 is provided between the middle of the rotating shaft 3d and the box body 1a, and the inner and outer side walls of the oil-containing bearing 8 respectively abut against the outer side wall of the rotating shaft 3d and the inner side wall of the box body 1a, thereby improving the supporting effect on the rotating shaft 3d.

[0025] A spherical bearing 9 is provided between the other end of the rotating shaft 3d having the worm portion 3e and the housing 3a. A positioning groove 2 10 matching the spherical bearing 9 is provided at the inner end of the housing 3a, and the spherical bearing 9 is embedded in the positioning groove 2 10, so that the rotating shaft 3d has a better positioning effect and enables the rotating shaft 3d to rotate smoothly.

[0026] A shaft shoulder 1b is provided in the box body 1a and the outer end of the copper sleeve 4 abuts against the end surface of the shaft shoulder 1b, which has a good positioning effect on the shaft sleeve.

[0027] Since a copper sleeve 4 is provided between the outer end of the rotating shaft 3d and the housing 1a, the support for the rotating shaft 3d is improved and the rotating shaft 3d can rotate smoothly, which can reduce the deformation of the worm portion 3e and avoid the phenomenon of excessive engagement of the worm portion 3e and the worm wheel 2 causing the motor 3 to get stuck. The rotating shaft 3d of the motor 3 is rotated in the opposite direction by the commutator 7, so that the motor 3 can be restarted and reset normally by reversing the direction of the motor 3. It has the advantages of reliable and stable operation and compact structure.

[0028] As another way, Figure 3 As shown, the outer end ring of the copper sleeve 4 is provided with an arc-shaped protrusion 4a, the inner end surface of the box body 1a is provided with an arc-shaped groove 1c matching the arc-shaped protrusion 4a, and the arc-shaped protrusion 4a is embedded in the arc-shaped groove 1c. An oil film is formed between the arc-shaped groove 1c and the arc-shaped protrusion 4a, so that the copper sleeve 4 and the box body 1a have a better axial positioning effect, and the support effect on the rotating shaft 3d is improved.

[0029] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

[0030] Although this document frequently uses terms such as gearbox 1, housing 1a, shoulder 1b, arcuate groove 1c, worm gear 2, motor 3, housing 3a, stator 3b, rotor 3c, rotating shaft 3d, worm portion 3e, positioning groove 3f, copper sleeve 4, arcuate protrusion 4a, ball 5, plug 6, commutator 7, oil-containing bearing 8, spherical bearing 9, and positioning groove 2 10, the use of other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitations is contrary to the spirit of the present invention.

Claims

1. A shift actuator for a transfer case of an automobile, comprising a gearbox (1) and a motor (3), wherein the gearbox (1) comprises a housing (1a) and a worm gear (2) axially fixedly connected to the housing (1a), and the motor (3) comprises a housing (3a), a stator (3b), a rotor (3c), and a rotating shaft (3d), wherein the housing (3a) of the motor (3) is fixedly connected to one end of the housing (1a), and the outer end of the rotating shaft (3d) has a worm portion (3e) and the worm portion (3e) is meshed with the worm gear (2), characterized in that: A copper sleeve (4) is provided between the outer end of the rotating shaft (3d) and the housing (1a). The copper sleeve (4) is located outside the worm portion (3e), and the inner and outer side walls of the copper sleeve (4) respectively abut against the outer side wall of the rotating shaft (3d) and the inner side wall of the housing (1a).

2. The shift actuator of the automobile transfer case according to claim 1, characterized in that: The outer end of the rotating shaft (3d) is provided with a positioning groove (3f), a ball (5) is embedded in the positioning groove (3f), the outer end of the ball (5) protrudes from the outer end surface of the rotating shaft (3d), and a plug (6) is threadedly connected to the box body (1a), and the plug (6) is pressed against the ball (5).

3. The shift actuator of the automobile transfer case according to claim 1, characterized in that: A commutator (7) is provided in the housing (3a), and the commutator (7) is connected to the rotating shaft (3d).

4. The shift actuator of the automobile transfer case according to claim 1, 2 or 3, characterized in that: An oil-containing bearing (8) is provided between the middle of the rotating shaft (3d) and the box body (1a), and the inner and outer side walls of the oil-containing bearing (8) respectively abut against the outer side wall of the rotating shaft (3d) and the inner side wall of the box body (1a).

5. The shift actuator of the automobile transfer case according to claim 1, 2 or 3, characterized in that: The rotating shaft (3d) has a spherical bearing (9) disposed between the other end of the worm portion (3e) and the housing (3a), and the inner end of the housing (3a) is provided with a second positioning groove (10) matching the spherical bearing (9), and the spherical bearing (9) is embedded in the second positioning groove (10).

6. The shift actuator of the automobile transfer case according to claim 1, 2 or 3, characterized in that: A shaft shoulder (1b) is provided in the box body (1a), and the outer end of the copper sleeve (4) abuts against the end surface of the shaft shoulder (1b).

7. The shift actuator of the automobile transfer case according to claim 1, 2 or 3, characterized in that: The outer end ring of the copper sleeve (4) is provided with an arc-shaped convex body (4a), the inner end surface of the box body (1a) is provided with an arc-shaped groove (1c) matching the arc-shaped convex body (4a), and the arc-shaped convex body (4a) is embedded in the arc-shaped groove (1c), and an oil film is formed between the arc-shaped groove (1c) and the arc-shaped convex body (4a).

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