Gear shift actuator

Abstract

The utility model relates to a kind of gear shifting actuators, it includes: power mechanism, the power mechanism is used to provide torque;Transmission assembly, the transmission assembly is connected with the power mechanism, for transmitting the torque output by the power mechanism;Output shaft;It further includes transmission buffer mechanism, the transmission buffer mechanism includes: buffer upper shell, the buffer upper shell is set on the output shaft and is connected with the transmission assembly;Buffer lower shell, the buffer lower shell is engaged on the buffer upper shell and can be rotated with the output shaft synchronously;The buffer lower shell and the buffer upper shell form containing space;The buffer lower shell has multiple first limiting protrusions in the containing space;Elastic element, the elastic element is arranged in the containing space and is clamped between multiple first limiting protrusions and multiple second limiting protrusions.The impact of the shift fork connected to the end of the output shaft on the actuator can be reduced in this way.

Description

Technical Field

[0001] This utility model belongs to the field of automotive transmission structure technology and relates to a gear shifting actuator. Background Technology

[0002] The gear shift actuator is a major component of the automotive transmission system. Its main purpose is to drive the gearbox to change gears and shift speeds according to the instructions issued by the gear shift controller, thereby enabling the vehicle to drive normally.

[0003] Chinese utility model patent application number 202422050507.X discloses a gear shifting actuator, including a drive motor; a transmission assembly driven and rotated by the drive motor, the transmission assembly including a first coupling and a second coupling coaxially arranged, the second coupling being connected to a gear shifting drive unit; the first coupling including first teeth spaced circumferentially, the second coupling including second teeth spaced circumferentially and extending between adjacent first teeth; a gap formed between the first teeth and the second teeth in the rotation direction, with an elastic element disposed within the gap; and a shift fork connected to the gear shifting drive unit. When the first coupling rotates, it can drive the second coupling to rotate, thereby squeezing the elastic element, and simultaneously driving the shift fork to perform gear shifting through the gear shifting drive unit. Because a gap is formed between the first teeth and the second teeth in the rotation direction, and an elastic element is disposed within the gap, a buffering effect is achieved; however, the elastic element in this structure is easily damaged, and the buffering effect still has room for improvement. Summary of the Invention

[0004] The purpose of this utility model is to address the shortcomings of existing technologies by proposing a gear shifting actuator.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a gear shifting actuator, comprising: A power mechanism, wherein the power mechanism is used to provide torque; A transmission assembly, which is connected to the power mechanism, is used to transmit the torque output by the power mechanism; Output shaft; It also includes a transmission buffer mechanism, which comprises: A buffer upper shell, which is sleeved on the output shaft and connected to the transmission assembly; A buffer lower shell is engaged with a buffer upper shell and can rotate synchronously with the output shaft; the buffer lower shell and the buffer upper shell form a receiving space; the buffer lower shell has multiple first limiting protrusions located within the receiving space, and the buffer upper shell has multiple second limiting protrusions located within the receiving space and cooperating with the multiple first limiting protrusions; An elastic element is disposed within the receiving space and is engaged between a plurality of first limiting protrusions and a plurality of second limiting protrusions.

[0006] Optimally, the power mechanism includes a drive motor and a first transmission gear mounted on the output shaft of the drive motor; the transmission assembly includes a cooperating worm gear and worm pair, the worm pair including a worm meshing with the worm gear and a second transmission gear mounted on one end of the worm and meshing with the first transmission gear, and the buffer upper shell is connected to the worm gear.

[0007] Ideally, a transmission protrusion is formed on the circumferential surface of the output shaft, and a limiting transmission hole that mates with the transmission protrusion is provided at the center of the buffer lower housing.

[0008] Furthermore, the lower buffer shell is provided with at least one limiting hole, and the upper buffer shell or the second limiting protrusion is provided with a limiting block that can be embedded in the limiting hole.

[0009] Optimally, the elastic element includes an element body, a second shaft hole opened at the center of the element body and coaxial with the first shaft hole, and a plurality of lugs formed on the circumferential surface of the element body and sandwiched between the first limiting protrusion and the second limiting protrusion.

[0010] Furthermore, a first concave arc groove is formed on the side of the first limiting protrusion, a second concave arc groove is formed on the side of the second limiting protrusion, and a convex arc portion is formed on the side of the lug block that cooperates with the first concave arc groove and the second concave arc groove.

[0011] Ideally, one end of the output shaft has a receiving hole and the other end has a drive gear. The shifting actuator also includes a position detection component, which includes a magnet seat embedded in the receiving hole, a magnet installed in the magnet seat, and a position sensor disposed outside the magnet and cooperating with it.

[0012] Ideally, it also includes: Lower housing; An upper housing is mounted on the lower housing and together they form an installation space.

[0013] Furthermore, it also includes: A first bearing is installed within the mounting space and sleeved on the output shaft; A liquid seal is installed within the mounting space and sleeved on the output shaft; The second bearing is installed within the mounting space and sleeved on the output shaft.

[0014] Furthermore, the worm gear pair also includes a third bearing and a fourth bearing installed within the installation space and sleeved on the worm.

[0015] The beneficial effects of this application are: the shifting actuator of this utility model connects the transmission component, the output shaft and the transmission buffer mechanism with a specific structure. This allows the hard contact between the transmission component and the output shaft to be buffered when the power mechanism applies torque to the output shaft through the transmission component, thereby reducing the impact of the shift fork connected to the end of the output shaft on the actuator. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the gear shifting actuator of this utility model; Figure 2 for Figure 1 AA section view; Figure 3 for Figure 1 Exploded view; Figure 4 This is an exploded view of the transmission buffer mechanism in the gear shifting actuator of this utility model; Figure 5 This is a schematic diagram of the buffer upper shell in the shift actuator of this utility model. Detailed Implementation

[0017] The present application will now be described in further detail with reference to specific embodiments and accompanying drawings. Similar elements in different embodiments are referred to by related similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of the present application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to the present application are not shown or described in the specification. This is to avoid obscuring the core parts of the present application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0018] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments, and the operational steps involved in each embodiment can also be rearranged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the specification and drawings are only for clearly describing a particular embodiment and do not imply that they represent the necessary components and / or order.

[0019] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0020] like Figures 1 to 3 The shifting actuator shown mainly includes a transmission buffer mechanism 1, an output shaft 3, a power mechanism 4, and transmission components.

[0021] In this embodiment, the power mechanism 4 provides torque. The power mechanism 4 includes a drive motor 41 and a first transmission gear 42 mounted on the output shaft of the drive motor 41. A transmission assembly is connected to the power mechanism 4 to transmit the torque output by the power mechanism 4. The transmission assembly can be conventional, such as those disclosed in Chinese patents with application numbers 202422050507.X and 202411723599.1. In this embodiment, the transmission assembly includes a cooperating worm gear 2 and a worm pair 5. The worm pair 5 includes a worm 52 meshing with the worm gear 2 and a second transmission gear 51 mounted at one end of the worm 52 and meshing with the first transmission gear 42. The axis of the output shaft 3 is perpendicular to the axis of the worm 52. The transmission buffer mechanism 1 is connected to the transmission assembly (specifically, to the worm gear 2) and sleeved on the output shaft 3, thereby synchronously driving the output shaft 3 to rotate along its own axis under the drive of the worm gear 2. This allows the hard contact between the transmission component and the output shaft 3 to be buffered when the power mechanism 4 applies torque to the output shaft 3 through the transmission component, thereby reducing the impact of the shift fork connected to the end of the output shaft 3 on the actuator.

[0022] like Figure 4 and Figure 5 The transmission buffer mechanism 1 shown mainly includes a buffer upper shell 11, an elastic element 12, and a buffer lower shell 13, etc.

[0023] The buffer lower shell 13 includes a lower shell body and a limiting transmission hole 133 opened at the center of the lower shell body. The limiting transmission hole 133 is not circular, but can be square, elliptical or other conventional shapes. This is because it needs to cooperate with the output shaft 3 (the output shaft 3 has a protruding structure formed on its circumference (usually formed by integral molding or machining, etc., the same below) that cooperates with the limiting transmission hole 133, such as a transmission protrusion 31 of the corresponding shape; that is, the buffer lower shell 13 has a limiting transmission hole 133 at the center that cooperates with the transmission protrusion 31). In this way, when the buffer lower shell 13 rotates with its axis of rotation under the action of external force, the cooperation between the protruding structure and the limiting transmission hole 133 can drive the output shaft 3 to rotate synchronously (that is, the buffer lower shell 13 can rotate synchronously with the output shaft 3). In this embodiment, the lower shell body includes a lower shell retaining ring 132 and a limiting plate 131 formed in the lower shell retaining ring 132, and a limiting transmission hole 133 is opened at the center of the limiting plate 131.

[0024] The upper buffer housing 11 is sleeved on the output shaft 3 and connected to the worm gear 2 of the transmission assembly. The upper buffer housing 11 is engaged with the lower buffer housing 13 and together they form a receiving space (or the lower buffer housing 13 is engaged with the upper buffer housing 11). Since the upper buffer housing 11 is engaged with the lower buffer housing 13, when the upper buffer housing 11 rotates around its axis under the drive of the external transmission structure, it will drive the lower buffer housing 13 to rotate synchronously. This will result in hard contact between the upper buffer housing 11 and the lower buffer housing 13. To address the aforementioned issues, the lower buffer shell 13 further includes multiple first limiting protrusions 135 formed on the shell body and located within the accommodating space, and the upper buffer shell 11 has multiple second limiting protrusions 115 located within the accommodating space and cooperating with the multiple first limiting protrusions 135. In this embodiment, there are two first limiting protrusions 135 symmetrical about the axis of the limiting transmission hole 133, and there are also two second limiting protrusions 115 symmetrical about the axis of the limiting transmission hole 133. The first limiting protrusions 135 and the second limiting protrusions 115 are staggered. Meanwhile, an elastic element 12 is disposed within the accommodating space and is engaged between the multiple first limiting protrusions 135 and the multiple second limiting protrusions 115. When the upper buffer shell 11 drives the lower buffer shell 13 to rotate, the first limiting protrusion 135 and the second limiting protrusion 115 make contact through the elastic element 12 to achieve buffering (that is, the elastic element 12 is set in the accommodating space and is stuck between multiple first limiting protrusions 135 and multiple second limiting protrusions 115), thereby realizing the buffering between the upper buffer shell 11 and the lower buffer shell 13, reducing the impact between them on their internal structure, and the hard contact between the transmission component and the output shaft 3 is buffered, thereby reducing the impact of the shift fork connected to the end of the output shaft 3 on the actuator.

[0025] In this embodiment, the buffer upper shell 11 includes an upper shell body and a first shaft hole 113 (the first shaft hole 113 is located at the center of the disc body 111) which is opened at the center of the upper shell body and corresponds to the limiting transmission hole 133. Thus, the buffer upper shell 11 is sleeved on the output shaft 3 through the first shaft hole 113. Multiple second limiting protrusions 115 are formed on the upper shell body and face the buffer lower shell 13. Specifically, the upper shell body includes a disc body 111 and multiple pin holes 114 formed on the disc body 111 (the multiple pin holes 114 extend axially along the disc body 111 but do not penetrate the disc body 111; they are formed on the end face of the disc body 111 facing away from the lower buffer shell 1 and distributed around the first shaft hole 113; at the same time, the worm gear 2 has multiple worm gear pin holes 21 parallel to its axis and corresponding to the pin holes 114, so that pins 20 can be installed in the pin holes 114 and the worm gear pin holes 21 to connect the upper buffer shell 11 and the worm gear 2, thereby allowing the worm gear 2 to drive the upper buffer shell 11 to rotate synchronously; such as Figure 2(As shown). In this embodiment, the upper shell body also includes a convex ring 112 formed on the circumferential surface of the disc body 111. In this embodiment, the engagement method between the buffer upper shell 11 and the buffer lower shell 13 can adopt conventional methods, but the following method is preferred: the buffer lower shell 13 also includes at least one limiting hole 134 (two in this application, which are symmetrical about the limiting transmission hole 133) formed on the limiting plate 131, and a limiting block 116 that can be embedded in the limiting hole 134 is formed on the disc body 111 or the second limiting protrusion 115 (in this application, there are also two limiting blocks 116, which are symmetrical about the limiting transmission hole 133 and preferably formed on the second limiting protrusion 115, which simplifies the structure of the buffer lower shell 13). When the upper buffer shell 11 and the lower buffer shell 13 are joined together, the limiting block 116 is engaged in the limiting hole 134 (the limiting hole 134 is slightly larger than the limiting block 116, so that a buffer gap is formed between the limiting hole 134 and the limiting block 116, thus reserving buffer space between the upper buffer shell 11 and the lower buffer shell 13), ensuring the buffering effect between the aforementioned first limiting protrusion 135, the second limiting protrusion 115 and the elastic element 12; subsequently, the limiting block 116 makes hard contact with the limiting hole 134, thereby causing the upper buffer shell 11 and the lower buffer shell 13 to rotate synchronously. In this embodiment, the elastic element 12 is made of a conventional elastic material (such as rubber). It includes an element body 121, a second shaft hole 122 located at the center of the element body 121 and coaxial with the first shaft hole 113, and a plurality of lugs 123 formed on the circumferential surface of the element body 121 and sandwiched between the first limiting protrusion 135 and the second limiting protrusion 115 (at this time, there are four lugs 123, sandwiched between adjacent first limiting protrusions 135 and second limiting protrusions 115). In addition, the side of the first limiting protrusion 135 is formed with a first concave arc groove 1351, the side of the second limiting protrusion 115 is formed with a second concave arc groove 1151, and the side of the lugs 123 is formed with a convex arc portion 1231 that cooperates with the first concave arc groove 1351 and the second concave arc groove 1151, thereby further ensuring the uniformity of the force applied by the first limiting protrusion 135 and the second limiting protrusion 115 to the lugs 123 and improving the buffering effect.

[0026] In this embodiment, one end of the output shaft 3 (i.e. Figure 3 The upper end of the middle) has a receiving hole 32 and the other end (i.e. Figure 3The lower end of the output shaft 3 has a drive gear 33 that engages with the rack of the shift fork. When the output shaft 3 rotates, the drive gear 33 drives the rack of the shift fork, achieving linear motion of the shift fork. It can be understood that the shift fork can engage with the electric drive axle or the gearbox shift sleeve to perform gear shifting as it moves through them. The aforementioned shifting actuator also includes a position detection component 9, which includes a magnet seat 91 embedded in the receiving hole 32, a magnet 92 installed in the magnet seat 91, and a position sensor 93 located outside and engaging with the magnet 92. This allows for the detection of the rotation angle of the output shaft 3, ensuring precise control of the shifting position and improving the accuracy and reliability of gear shifting.

[0027] In this embodiment, the shifting actuator further includes a lower housing 6 and an upper housing (not shown in the figure). The upper housing is mounted on the lower housing 6 and forms an installation space with it. Mounting structures are formed on the inner walls of the lower housing 6 and the upper housing to mount various bearings and liquid seals, which mate with the stepped portion of the output shaft 3. Thus, as... Figure 2 As shown, the shifting actuator also includes a first bearing 71, a second bearing 72, and a liquid seal 8. The first bearing 71 is installed in the aforementioned mounting space and sleeved on the output shaft 3. The second bearing 72 is also installed in the aforementioned mounting space and sleeved on the output shaft 3 (the second bearing 72 is located above the first bearing 71 and spaced apart from it, so that the second bearing 72 and the first bearing 71 are respectively located on both sides of the transmission buffer mechanism 1), thereby reducing the frictional force when the output shaft 3 rotates. The liquid seal 8 is also installed in the mounting space and sleeved on the output shaft 3, and it is located between the transmission buffer mechanism 1 and the first bearing 71. In this embodiment, the worm gear pair 5 also includes a third bearing 53 and a fourth bearing 54 installed in the mounting space and sleeved on the worm 52 (the third bearing 53 and the fourth bearing 54 are respectively located on both sides of the worm wheel 2), thereby reducing the frictional force when the worm 52 rotates.

[0028] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A gear shifting actuator, comprising: A power mechanism (4) is used to provide torque; A transmission assembly, which is connected to the power mechanism (4) and is used to transmit the torque output by the power mechanism (4); Output shaft (3); Its characteristic is that it further includes a transmission buffer mechanism (1), the transmission buffer mechanism (1) comprising: The buffer upper shell (11) is sleeved on the output shaft (3) and connected to the transmission assembly; the buffer upper shell (11) includes an upper shell body and a first shaft hole (113) opened at the center of the upper shell body. A buffer lower shell (13) is engaged with the buffer upper shell (11) and can rotate synchronously with the output shaft (3); the buffer lower shell (13) and the buffer upper shell (11) form a receiving space; the buffer lower shell (13) has multiple first limiting protrusions (135) located in the receiving space, and the buffer upper shell (11) has multiple second limiting protrusions (115) located in the receiving space and cooperating with the multiple first limiting protrusions (135); An elastic element (12) is disposed within the receiving space and is engaged between multiple first limiting protrusions (135) and multiple second limiting protrusions (115); The power mechanism (4) includes a drive motor (41) and a first transmission gear (42) mounted on the output shaft of the drive motor (41); the transmission assembly includes a worm gear (2) and a worm pair (5) that cooperate with each other. The worm pair (5) includes a worm (52) that meshes with the worm gear (2) and a second transmission gear (51) mounted on one end of the worm (52) and meshing with the first transmission gear (42). The buffer upper shell (11) is connected to the worm gear (2).

2. The gear shifting actuator according to claim 1, characterized in that: A transmission protrusion (31) is formed on the circumferential surface of the output shaft (3), and a limiting transmission hole (133) that cooperates with the transmission protrusion (31) is provided at the center of the buffer lower shell (13).

3. The shifting actuator according to claim 1 or 2, characterized in that: The lower buffer shell (13) is also provided with at least one limiting hole (134), and the upper buffer shell (11) or the second limiting protrusion (115) is provided with a limiting block (116) that can be embedded in the limiting hole (134).

4. The gear shifting actuator according to claim 1, characterized in that: The elastic element (12) includes an element body (121), a second shaft hole (122) opened at the center of the element body (121) and coaxial with the first shaft hole (113), and a plurality of lugs (123) formed on the circumferential surface of the element body (121) and sandwiched between the first limiting protrusion (135) and the second limiting protrusion (115).

5. The gear shifting actuator according to claim 4, characterized in that: The first limiting protrusion (135) has a first concave arc groove (1351) on its side, the second limiting protrusion (115) has a second concave arc groove (1151) on its side, and the lug block (123) has a convex arc portion (1231) on its side that cooperates with the first concave arc groove (1351) and the second concave arc groove (1151).

6. The gear shifting actuator according to claim 1, characterized in that: The output shaft (3) has a receiving hole (32) at one end and a drive gear (33) at the other end. The shifting actuator also includes a position detection component (9), which includes a magnet seat (91) embedded in the receiving hole (32), a magnet (92) installed in the magnet seat (91), and a position sensor (93) disposed outside the magnet (92) and cooperating with it.

7. The gear shifting actuator according to claim 1, characterized in that, It also includes: Lower housing (6); The upper housing is mounted on the lower housing (6) and together they form an installation space.

8. The gear shifting actuator according to claim 7, characterized in that, It also includes: The first bearing (71) is installed in the installation space and sleeved on the output shaft (3); A liquid seal (8) is installed in the installation space and sleeved on the output shaft (3); The second bearing (72) is installed in the mounting space and sleeved on the output shaft (3).

9. The gear shifting actuator according to claim 7, characterized in that: The worm gear pair (5) also includes a third bearing (53) and a fourth bearing (54) installed in the installation space and sleeved on the worm gear (52).

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