CN216742783U

CN216742783U - Torque transmission assembly and motor actuator

Info

Publication number: CN216742783U
Application number: CN202122979532.2U
Authority: CN
Inventors: 蔚帅; 王海波
Original assignee: Schaeffler Technologies AG and Co KG
Current assignee: Schaeffler Technologies AG and Co KG
Priority date: 2021-11-30
Filing date: 2021-11-30
Publication date: 2022-06-14
Anticipated expiration: 2031-11-30

Abstract

The application provides a torque transmission assembly and a motor actuator, which comprise a gear ring, an output shaft and a ball bearing, wherein the gear ring is used for receiving input torque; the output shaft is connected with the gear ring in a torsion-proof manner and is provided with a shaft neck part and a threaded section, and the threaded section is used for being matched with an execution component to form a screw pair; the ball bearing is arranged on the radial outer side of the shaft neck part. The torque transmission assembly and the motor actuator can realize torque transmission through arrangement and matching of the gear ring and the output shaft, and meanwhile, the arrangement of the ball bearing ensures the rotation precision and bears the axial thrust so as to ensure the stable operation of the torque transmission assembly; when guaranteeing the moment of torsion transmission effect, the moment of torsion transmission subassembly has succinct structure, and the assembly is convenient, and each part adopts the standard component more, helps reduction in production cost.

Description

Torque transmission assembly and motor actuator

Technical Field

The application relates to the technical field of motor actuators, in particular to a torque transmission assembly and a motor actuator.

Background

Electric motor actuators are widely used in electric motor systems and include an electric motor, a torque transfer assembly that, upon receiving an input torque from the electric motor, transfers the input torque through the torque transfer assembly to an actuator, and outputs torque and/or displacement through the actuator.

In an electric vehicle, an electric motor actuator may be used to perform functions such as shifting and selecting gears of a transmission. For example, the actuating component is a shifting sheet, and when the gear shifting device is used, the motor drives the shifting sheet to move through the torque transmission assembly so as to shift the synchronizer and enable the synchronizer to be meshed with different output gears in the gearbox, and therefore the gear shifting or selecting function is achieved.

Disclosure of Invention

The application provides a torque transmission assembly and a motor actuator, which can realize stable transmission of torque with lower cost.

The application provides a torque transmission assembly, which comprises a gear ring, an output shaft and a ball bearing, wherein the gear ring is used for receiving input torque; the output shaft is connected with the gear ring in a torsion-proof manner and is provided with a shaft neck part and a threaded section, and the threaded section is used for being matched with an execution component to form a screw pair; the ball bearing is arranged on the radial outer side of the shaft neck part.

In some embodiments, a side of the gear ring close to the ball bearing is provided with a protruding portion, and a radial outer side of the protruding portion forms a first avoidance area; a flange is arranged on one side, away from the gear ring, of the shaft neck part on the output shaft, and a second avoidance area is formed on the radial outer side of the flange; the ball bearing comprises an inner ring and an outer ring, and the inner ring is matched with the journal part; the two axial ends of the inner ring are abutted between the protruding portion and the flange, and the first avoidance area and the second avoidance area are used for avoiding the outer ring.

In some embodiments, the torque transfer assembly further comprises a housing, the ring gear, the ball bearings, and the output shaft being disposed within the housing, and the output shaft extending from one end of the housing outside of the housing; a supporting sleeve is arranged in the shell, and two axial ends of the outer ring are abutted between the supporting sleeve and one end of the shell.

In some embodiments, a mounting groove is formed in the shell, a clamp spring is arranged at the mounting groove, and the clamp spring abuts against one end, far away from the outer ring, of the support sleeve.

In some embodiments, an end of the support sleeve, which is far away from the ball bearing, is provided with a mounting part, the mounting part is used for mounting a power mechanism for inputting torque, and a first sealing element is arranged between the mounting part and the radial direction of the shell.

In some embodiments, the housing is provided with a step portion facing the outer end of the output shaft at a circumferential outer side thereof, the step portion being provided with a second seal.

In some embodiments, a through hole is formed in the middle of the gear ring, and the end portion of the output shaft close to the gear ring is fixedly connected to the through hole.

In some embodiments, the ring gear is an annulus gear.

In some embodiments, the ball bearing is a deep groove ball bearing.

Accordingly, the present application also provides a motor actuator comprising an electric motor, the aforementioned torque transfer assembly and an actuator member, wherein the electric motor comprises an input shaft, the input shaft is engaged with the ring gear to input torque, and the input shaft is parallel to the output shaft; the execution component is matched with the thread section and forms a lead screw pair.

The application has the following beneficial effects: the torque transmission assembly and the motor actuator can realize torque transmission through arrangement and matching of the gear ring and the output shaft, and simultaneously ensure the rotation precision and bear the axial thrust through the arrangement of the ball bearing so as to ensure the stable operation of the torque transmission assembly; when guaranteeing the moment of torsion transmission effect, the moment of torsion transmission subassembly has succinct structure, and the assembly is convenient, and each part adopts standard component more, helps reduction in production cost.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 schematically shows the structure of a torque transmission assembly according to the present application.

Fig. 2 is a schematic view illustrating a structure of a torque transmission assembly with a power mechanism mounted therein according to the present application.

Fig. 3 is a schematic view illustrating a structure of a motor actuator according to the present application.

Torque transmitting assembly 100 ring gear 110

Protrusion 111 through hole 112

First avoidance zone 112 output shaft 120

The journal portion 121 has a threaded section 122

Flange 123 attachment portion 124

Second avoidance region 125 ball bearing 130

Inner race 131 and outer race 132

First end 141 of housing 140

Second end 142 mounting groove 143

Stepped portion 144 bushing 150

Mounting portion 161 of support sleeve 160

Circlip 170 first seal 180

Second seal 190 Motor actuator 200

Motor 210 input shaft 211

Execution Components 220, 220'

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application. Furthermore, it should be understood that the detailed description and specific examples, while indicating exemplary embodiments of the invention, are given by way of illustration and explanation only, and are not intended to limit the scope of the invention. In the present application, unless otherwise specified, the use of directional terms such as "upper", "lower", "left" and "right" generally refer to upper, lower, left and right in the actual use or operation of the device, and specifically to the orientation of the drawing figures.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.

The present application provides a torque transmission assembly and a motor actuator, each of which is described in detail below. It should be noted that the following description of the embodiments is not intended to limit the preferred order of the embodiments in this application. In the following embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to related descriptions of other embodiments for parts that are not described in detail in a certain embodiment.

In an electric motor actuator, a torque transmission assembly is provided for transmitting torque, the torque transmission assembly including a gear for mounting on a shaft of an electric motor to receive torque, a crown wheel in meshing engagement with the gear and connected with the output shaft to transmit the torque to the output shaft and rotate the output shaft, and an output shaft for connection with an actuator of the electric motor actuator to drive the actuator to achieve a desired movement.

The crown wheel and the output shaft are perpendicularly intersected, and the matching precision requirement of the crown wheel and the output shaft is high, so that the requirements of the output shaft and the crown wheel on the machining process are high, and the torque transmission assembly has high production cost.

Therefore, referring to fig. 1, an embodiment of the present application provides a torque transmission assembly 100, and while the torque transmission effect is ensured, the torque transmission assembly 100 has a simple structure, and each component is mostly made of standard components, which is helpful for reducing the production cost.

Referring to FIG. 1, the torque transfer assembly 100 includes a ring gear 110, an output shaft 120, and ball bearings 130.

Wherein the ring gear 110 is configured to cooperate with a power mechanism to receive an input torque. Referring to fig. 3, in a scenario applied to the motor actuator 200, the motor actuator 200 is provided with a motor 210 to input torque, and the ring gear 110 is engaged with an input shaft 211 of the motor 210 to receive the input torque.

Illustratively, as shown in fig. 1 and 3, the ring gear 110 is an inner ring gear, that is, an internal thread is provided in the ring gear 110 for engaging with the input shaft 211, and a through hole 112 is further provided at the center of an end of the ring gear 110 for connecting with the output shaft 120. It will be appreciated that in other embodiments, the ring gear 110 may also be an external ring gear, i.e. a thread is provided on the circumferential outer side of the ring gear 110 for engagement with the input shaft 211.

The output shaft 120 is connected in a rotationally fixed manner to the ring gear 110, so that the output shaft 120 can rotate synchronously with the rotation of the ring gear 110, i.e. the output shaft 120 can receive the torque from the ring gear 110.

For example, referring to fig. 1, a connecting portion 124 is disposed at an end of the output shaft 120, and the connecting portion 124 is fixedly connected to the through hole 112 at the middle of the ring gear 110 by a rivet and can rotate synchronously with the ring gear 110, that is, the output shaft 120 is coaxially disposed with the ring gear 110 by riveting to be connected in a torsion-proof manner. It is understood that in other embodiments, the output shaft 120 may be welded, integrally formed, bolted, or otherwise connected to the ring gear 110 to prevent rotation.

Therefore, the torque transmission can be realized through the arrangement of the gear ring 110 and the output shaft 120, compared with the matching mode of a gear, a crown wheel and an output shaft, the gear ring 110 and the output shaft 120 are coaxially arranged, a vertically crossed matching mode does not exist, the assembly is more convenient, the requirement on matching precision is reduced, the gear ring 110 and the output shaft 120 can directly adopt the existing standard part, and the cost is relatively low.

Here, the output shaft 120 is provided with a threaded section 122, and the actuating member 220 (see fig. 3) can cooperate with the threaded section 122 to form a screw pair. When the output shaft 120 rotates due to the driving of the ring gear 110, the output shaft 120 can make the actuator 220 move linearly along the axial direction of the output shaft 120 through a screw pair.

The output shaft 120 is further provided with a journal portion 121, and the journal portion 121 is a portion of the output shaft 120 extending in the axial direction and is a position for mounting the ball bearing 130.

The ball bearing 130 is disposed on a radial outer side of the journal portion 121, and is configured to bear an axial pressure, support the output shaft 120, reduce a friction coefficient of the output shaft 120 during a motion process, and ensure a rotation precision of the output shaft 120.

Although the capability of the ball bearing 130 for bearing the axial thrust is weaker than that of a thrust bearing, the ball bearing 130 can already meet the use requirement in a common use scene, and the ball bearing 130 has a lower friction coefficient and a higher revolution precision, and the requirements of bearing a certain axial thrust, reducing the revolution friction coefficient and ensuring the revolution precision can be simultaneously met through the arrangement of the ball bearing 130. And because the ball bearing 130 is a standard product, the cost is lower and the assembly is more convenient. Illustratively, the ball bearing 130 may be a deep groove ball bearing 130.

In some embodiments, referring to fig. 1, a protruding portion 111 is disposed on a side of the ring gear 110 close to the ball bearing 130, and a radially outer side of the protruding portion 111 forms a first avoidance region 112; a flange 123 is arranged on the output shaft 120 on the side of the journal portion 121 far away from the gear ring 110, and a second avoidance area 125 is formed on the radial outer side of the flange 123; the ball bearing 130 includes an inner race 131 and an outer race 132, and the inner race 131 is fitted at the journal portion 121. It is understood that the ball bearing 130 further includes a conventional structure of a ball bearing, such as a rotor, a retainer, and an end cap, which is well known to those skilled in the art, and the detailed description of the embodiment is omitted.

Both axial ends of the inner ring 131 are abutted between the protruding portion 111 and the flange 123, and the first avoidance region 112 and the second avoidance region 125 are used for avoiding the outer ring 132.

Illustratively, with continued reference to fig. 1, the outer diameter of the protrusion 111 is smaller than or equal to the outer diameter of the inner ring 131 to form a first avoidance region 112 for avoiding the outer ring 132; the outer diameter of the flange 123 is smaller than or equal to the outer diameter of the inner ring 131 to form a second escape area 125 for escaping the outer ring 132. Meanwhile, the protruding portion 111 and the flange 123 are respectively attached to both sides of the inner ring 131 in the axial direction to fix the inner ring 131.

It can be seen that the clamping of the protruding portion 111 and the flange 123 makes the inner ring 131 fixed, and at the same time, the first avoiding region 112 and the second avoiding region 125 can avoid the outer ring 132, when the protruding portion 111, the inner ring 131 and the flange 123 rotate synchronously, the protruding portion 111 and the flange 123 are not in contact with the outer ring 132 which does not rotate together, and the protruding portion 111, the flange 123 and the outer ring 132 are not easily worn.

In some examples, please refer to fig. 2 and 3, the torque transmission assembly 100 further includes a housing 140, the ring gear 110, the output shaft 120 and the ball bearing 130 are disposed in the housing 140, and the output shaft 120 extends from one end of the housing 140 to the outside of the housing 140; a support sleeve 160 is disposed in the housing 140, and two axial ends of the outer ring 132 are abutted between the support sleeve 160 and one end of the housing 140.

Illustratively, the housing 140 has an opening at a first end 141 for the output shaft 120 to extend outward, and two axial ends of the outer ring 132 are held between the support sleeve 160 and an inner wall at the first end 141.

In some examples, referring to fig. 3, on the basis of providing the housing 140, an installation groove 143 is further provided in the housing 140, a snap spring 170 is disposed at the installation groove 143, and the snap spring 170 abuts against one end of the support sleeve 160 away from the outer ring 132.

Illustratively, the inner wall of the housing 140 is provided with the mounting groove 143, a radially outer end of the snap spring 170 is fixed in the mounting groove 143, the support sleeve 160 is located on a side of the snap spring 170 close to the ball bearing 130, a side of the snap spring 170 close to the support sleeve 160 abuts against the support sleeve 160, a side of the support sleeve 160 close to the ball bearing 130 abuts against the outer ring 132, and a side of the outer ring 132 close to the first end 141 abuts against the first end 141. In other words, when the bearing is installed, the outer ring 132 is held between the support sleeve 160 and the first end 141 of the housing 140 in the axial direction, and the snap spring 170 applies a force to the support sleeve 160, which is directed toward the first end 141 in the axial direction, so as to prevent the outer ring 132 from moving in the axial direction, and improve the stability of the ball bearing 130.

In some examples, referring to fig. 3, on the basis of providing the housing 140, the support sleeve 160 further has a second end 142, the first end 141 and the second end 142 are opposite ends, one end of the support sleeve 160 facing the second end 142 is provided with a mounting portion 161, the mounting portion 161 is used for mounting a power mechanism for inputting torque, and the power mechanism may be inserted into the mounting portion 161 to form a connection. Here, a first sealing member 180 is provided between the mounting portion 161 and the housing 140 in a radial direction near the second end 142 for securing sealability.

In some examples, the housing 140 is provided with a step 144 facing the outer end of the output shaft 120 at the circumferential outer side of the housing 140, and the step 144 is provided with a second sealing member 190.

For example, referring to fig. 3, the torque transmission assembly 100 is used for transmitting the torque to a gear box (not shown), the output shaft 120 is fitted with the actuator 220, and the actuator 220 is used for shifting a synchronizer ring in the gear box. When the torque transmission assembly 100 is fitted to the mounting opening of the gear box, the portion of the output shaft 120 extending outside the housing 140 and the actuating member 220 mounted on the output shaft 120 extend from the mounting opening into the gear box. Here, the stepped portion 144 substantially conforms to the outer wall of the gear case, so that the packing, which is the second seal 190, is compressed between the housing 140 and the outer wall of the gear case, and a seal between the housing 140 and the gear case is achieved.

In some examples, referring to fig. 2, on the basis that the torque transmission assembly 100 includes a housing 140, the housing 140 is further provided with a positioning hole for positioning and mounting the housing 140, and a bushing 150 is further provided in the positioning hole. The bushing 150 is a hollow cylinder structure, and is fittingly disposed in the positioning hole, when the housing 140 is fixedly mounted on other components, a connecting member such as a bolt and a screw penetrates the bushing 150 for positioning and mounting, and the bushing 150 plays a role in sealing and wear protection to prevent damage to the positioning hole due to operations such as mounting and dismounting.

In some embodiments, the specific assembly of the torque transfer assembly 100 is as follows. The ball bearing 130 is first mounted on the journal portion 121 of the output shaft 120, and then the output shaft 120 is fixedly assembled with the ring gear 110 to form a subassembly. The subassembly, the support sleeve 160 and the snap spring 170 are assembled into the housing 140 to form the torque transfer assembly 100.

As described above, the torque transmission assembly 100 is an assembly for transmitting an input torque to the actuator 220, and is mainly applied to the motor actuator 200. Accordingly, referring to fig. 3, an embodiment of the present application further provides a motor actuator 200, which includes a motor 210, the aforementioned torque transmission assembly 100, and an actuating member 220.

Wherein the motor 210 is an electrically driven device that converts electrical energy into mechanical energy, and includes an input shaft 211 for transmitting torque to the torque transmission assembly 100, the input shaft 211 being parallel to the output shaft 120, and the input shaft 211 cooperating with the ring gear 110 to input torque; the actuator 220 is coupled to the output shaft 120.

In some embodiments, and with continued reference to fig. 3, the input shaft 211 is eccentrically disposed from the output shaft 120 to better facilitate torque transfer. The gear ring 110 is an inner gear ring, the input shaft 211 is engaged with the inner gear ring, and the input shaft 211 is not coaxially arranged with the inner gear ring; the output shaft 120 and the ring gear are fixed in the middle of the ring gear, that is, the output shaft 120 and the ring gear are coaxially arranged. Here, the axis of the input shaft 211 and the axis of the output shaft 120 are not collinear, that is, the input shaft 211 and the output shaft 120 are disposed eccentrically.

In some embodiments, continuing to refer to fig. 3, the motor actuator 200 is cooperatively connected to a gear box (not shown), and the actuator 220 is a fork. When the torque-proof device is used, the motor 210 inputs torque to the gear ring 110 through the input shaft 211, the gear ring 110 transmits the torque to the output shaft 120 connected with the gear ring in a torque-proof manner and rotates the output shaft 120, and when the output shaft 120 rotates, the torque is converted into linear movement of the shifting fork through a screw pair formed between the shifting fork and the torque-proof device, for example, the shifting fork moves from the position of the execution component 220 to the position of the execution component 220' in the figure. Here, the shift fork shifts the synchronizing ring after moving to realize shifting.

It is understood that the terms in the motor actuator 200 of the present embodiment have the same meanings as those in the torque transmission assembly 100, and specific implementation details can refer to the descriptions in the embodiment of the torque transmission assembly 100, and the exemplary descriptions and technical effects shown in the foregoing embodiments can be correspondingly implemented in the motor actuator 200, which is not repeated in this embodiment.

The torque transmitting assembly 100 and the motor actuator 200 provided in the present application have been described in detail, and the principles and embodiments of the present application have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims

1. A torque transmitting assembly, comprising:

a ring gear for receiving an input torque;

the output shaft is connected with the gear ring in a torsion-proof manner and is provided with a shaft neck part and a threaded section, and the threaded section is used for being matched with an execution component to form a screw pair; and

and the ball bearing is arranged on the radial outer side of the journal part.

2. The torque transmitting assembly of claim 1,

a protruding part is arranged on one side, close to the ball bearing, of the gear ring, and a first avoidance area is formed on the radial outer side of the protruding part;

a flange is arranged on one side, away from the gear ring, of the shaft neck part on the output shaft, and a second avoidance area is formed on the radial outer side of the flange;

the ball bearing comprises an inner ring and an outer ring, and the inner ring is matched with the journal part;

the two axial ends of the inner ring are abutted between the protruding portion and the flange, and the first avoidance area and the second avoidance area are used for avoiding the outer ring.

3. The torque transmitting assembly as defined in claim 2, further including a housing, said ring gear, said ball bearings and said output shaft being disposed within said housing, and said output shaft extending from one end of said housing to outside said housing;

a supporting sleeve is arranged in the shell, and two axial ends of the outer ring are abutted between the supporting sleeve and one end of the shell.

4. The torque transmission assembly according to claim 3, wherein a mounting groove is formed in the housing, a clamp spring is arranged at the mounting groove, and the clamp spring abuts against one end of the support sleeve, which is far away from the outer ring.

5. The torque transmission assembly as claimed in claim 3, wherein the support sleeve is provided with a mounting portion at an end thereof remote from the ball bearing, the mounting portion being adapted to mount a power mechanism for inputting torque, and a first seal member is provided between the mounting portion and the housing in a radial direction.

6. The torque transfer assembly of claim 3, wherein the circumferentially outer side of the housing is provided with a step toward the outer end of the output shaft, the step being provided with a second seal.

7. The torque transfer assembly of claim 1, wherein the ring gear has a through hole in a central portion thereof, and the output shaft is fixedly attached to the through hole at an end portion thereof adjacent to the ring gear.

8. The torque transmitting assembly according to any one of claims 1 to 7, wherein the ring gear is an annulus gear.

9. The torque transfer assembly of any one of claims 1-7, wherein the ball bearings are deep groove ball bearings.

10. An electric motor actuator, comprising:

an electric motor, said electric motor including an input shaft;

the torque transmitting assembly according to any one of claims 1 to 9, said input shaft being in mesh with said ring gear for inputting torque and said input shaft being parallel to said output shaft; and

and the execution component is matched with the thread section and forms a screw pair.