A dual-screw driven shift actuator

Abstract

This utility model relates to a dual-screw drive shifting actuator, comprising: two sets of actuator components, each set including a motor, a screw mechanism, and a shifting mechanism; the screw mechanism includes a screw connected to the motor at one end and a screw nut linearly mounted on the screw; the shifting mechanism includes a shifting body rotatably mounted on a housing via a pin, a locking connector formed at one end of the shifting body and cooperating with the screw nut for synchronous movement, and a shift head formed at the other end of the shifting body; and a locking mechanism, comprising a sliding sleeve fixed to the housing and a sliding pin movably disposed within the sliding sleeve. Thus, when one screw mechanism moves, the sliding pin engages with the shifting mechanism on the other side, effectively preventing simultaneous movement of both screw mechanisms due to misoperation or software control misalignment.

Description

Technical Field

[0001] This utility model belongs to the field of automotive transmission structure technology and relates to a dual-screw drive shift actuator. Background Technology

[0002] The shift actuator is a key component of an automotive transmission system. Its main function is to drive the gearbox to change gears according to instructions from the shift controller, thereby enabling the vehicle to operate normally. Currently, shift actuators primarily use pneumatic, hydraulic, or traditional mechanical methods to drive the shift fork and change gears.

[0003] With the rapid development of new energy vehicles, gearboxes using pneumatic or hydraulic drive shift forks require additional pneumatic or hydraulic equipment, increasing the overall vehicle cost. Moreover, regardless of whether the drive method is pneumatic, hydraulic, or mechanical, there is a risk of unexpected gear slippage (especially under aggressive driving or special operating conditions), leading to safety hazards.

[0004] Chinese invention patent application number 201710670490.X discloses a screw drive mechanism and a drive-by-wire shift actuator. The screw drive mechanism includes a frame, a drive structure mounted on the frame, a screw pair structure connected to the drive structure, and a screw positioning structure connected to the screw pair structure. The screw pair structure includes a transmission screw connected to the drive structure, a screw nut connected to the transmission screw, and a slide rail groove formed on the frame, with the screw nut slidably disposed in the slide rail groove. The screw positioning structure includes a screw bracket mounted on the frame and a support bearing mounted on the screw bracket, with the transmission screw passing through the support bearing. This drive-by-wire shift actuator has a complex structure and cannot achieve multi-gear shifting in automotive gearboxes, electric drive axles, etc. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a dual-screw drive shifting actuator.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: a dual-screw driven shifting actuator, comprising: Two sets of actuators, each set including a motor, a lead screw mechanism, and a turning mechanism; the lead screw mechanism includes a lead screw connected to the motor at one end and a lead screw nut that is linearly movable and mounted on the lead screw; the turning mechanism includes a turning body that is rotatably mounted on the housing via a pin, a snap-fit ​​connector formed at one end of the turning body and cooperating with the lead screw nut for synchronous movement, and a turning head formed at the other end of the turning body; The locking mechanism includes a sliding sleeve fixed to the housing and a sliding pin movably disposed within the sliding sleeve. When one of the actuating bodies rotates about the axis of the pin, one of the actuating bodies pushes the sliding pin into the other actuating body.

[0007] Ideally, the snap-fit ​​connector has a clearance groove for the lead screw to pass through; at least one limiting protrusion is formed on the circumferential surface of the lead screw nut, and at least one limiting groove corresponding to the limiting protrusion is provided on the snap-fit ​​connector.

[0008] Furthermore, a receiving hole is provided on the side of the actuating body, and the pin is inserted into the receiving hole in a clearance fit manner.

[0009] Ideally, a first bearing and a second bearing are respectively installed at both ends of the lead screw in an interference fit, and the first bearing and the second bearing are independently clearance-fitted with the housing.

[0010] Ideally, the end face of the actuating body that forms the actuating head is recessed inward to form a actuating head groove, or the two actuating bodies have actuating head grooves on their opposing sides.

[0011] Furthermore, the sliding pin has push cones at both ends that cooperate with the dial groove.

[0012] The beneficial effects of this application are as follows: This utility model dual-screw drive shift actuator, by setting two sets of actuator components, makes each set of actuator components have at least two gears, so that the two sets of actuator components have four gears, which can realize multi-gear shifting of automobile gearboxes, electric drive axles, etc.; and a locking mechanism is set so that when one side of the screw mechanism moves, the sliding pin is locked into the other side of the actuation mechanism, which can effectively prevent the simultaneous movement of both screw mechanisms due to misoperation or software control misalignment. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the dual-screw drive shifting actuator of this utility model; Figure 2 for Figure 1 A bottom view; Figure 3 This is a schematic diagram of the actuation mechanism of this utility model. Detailed Implementation

[0014] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments. 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.

[0015] 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.

[0016] 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).

[0017] like Figures 1 to 2 The dual lead screw driven shift actuator shown includes two sets of cooperating actuators and a locking mechanism 8.

[0018] Preferably, the two sets of actuators are arranged side by side and aligned. Each set of actuators includes a motor 1, a lead screw mechanism 2, and a turning mechanism 5. The lead screw mechanism 2 includes a lead screw 21 connected to the motor 1 at one end and a lead screw nut 22 that is linearly mounted on the lead screw 21 (the engagement between the lead screw nut 22 and the lead screw 21 adopts a conventional method, such as a threaded connection; the motor 1 has a motor shaft, and the motor 1 and the lead screw 21 are connected and engaged through the motor shaft. Thus, when the motor 1 is working, it can drive the lead screw 21 to rotate, thereby driving the lead screw nut 22 to move linearly on the lead screw 21 (reciprocating linear motion)).

[0019] The shifting mechanism 5 includes a shifting body 51 rotatably mounted on a housing via a pin 6 (but the pin 6 is fixed to the housing by an interference fit; the housing is typically the outer shell of a double-screw drive shifting actuator), a snap-fit ​​connector 53 formed at one end of the shifting body 51 and cooperating with the screw nut 22 for synchronous movement, and a shift head 52 formed at the other end of the shifting body 51. Thus, when the screw nut 22 moves linearly on the screw 21, the screw nut 22 can synchronously drive the shifting body 51 to rotate about the axis of the pin 6, causing the shift head 52 to be in different positions, thereby achieving gear shifting for the corresponding automotive transmission or electric drive axle. Since there are two sets of actuators, each set having at least two gear positions (at least a starting position and a final position, but preferably a starting position and a final position), the two sets of actuators have at least four gear positions (preferably four gear positions), enabling multi-gear shifting for automotive transmissions, electric drive axles, etc.

[0020] In this embodiment, the snap-fit ​​connector 53 has a clearance groove 531 for the lead screw 21 to pass through, preferably allowing the lead screw nut 22 to be accommodated in the clearance groove 531. At least one limiting protrusion 221 (preferably cylindrical) is formed on the circumferential surface of the lead screw nut 22, and at least one limiting groove 532 corresponding to the limiting protrusion 221 is provided on the snap-fit ​​connector 53 (preferably two limiting protrusions 221 and two limiting grooves 532). Thus, the limiting protrusion 221 is placed within the limiting groove 532 and clearance-fitted therewith, thereby allowing the lead screw nut 22 to better drive the actuating mechanism 5 to rotate relative to the pin 6. A receiving hole 54 is provided on the side of the actuating body 51, and the pin 6 is inserted into the receiving hole 54 in a clearance-fit manner, thus not affecting the rotation of the actuating body 51 relative to the pin 6.

[0021] The locking mechanism 8 includes a sliding sleeve 80 fixed to the housing (i.e., the sliding sleeve 80 and the housing cannot move relative to each other; they are located between the two sets of actuators) and a sliding pin 81 movably disposed within the sliding sleeve 80 (the sliding sleeve 80 and the sliding pin 81 are clearance-fitted, allowing the sliding pin 81 to move axially along the sliding sleeve 80 under external force). When one actuating body 51 rotates about the axis of the pin 6, the actuating body 51 pushes the sliding pin 81 to insert into the other actuating body 51. In this embodiment, as... Figure 3As shown, the end face of the dial 52 in the actuating body 51 is recessed inward to form a dial groove 55, or, dial grooves 55 are formed on the opposing sides of the two actuating bodies 51, such that the dial groove 55 is arranged adjacent to a receiving hole 54 and located closer to the dial 52; the two ends of the sliding pin 81 have push cones 811 that cooperate with the dial groove 55. Thus, when any actuating body 51 rotates relative to the pin 6, the actuating body 51 will act on the push cones 811, pushing the sliding pin 81 to slide axially along the sliding sleeve 80, so that the sliding pin 81 enters the dial groove 55 of the other actuating body 51, the other actuating body 51 and the sliding sleeve 80 are locked together by the sliding pin 81, and the actuating body 51 is released from the sliding pin 81. However, when both actuating bodies 51 rotate simultaneously, both ends of the sliding pin 81 simultaneously insert into the dial groove 55. The sliding pin 81 is limited by the sliding sleeve 80 and the dial groove 55 and cannot move, so the entire double screw drive shift actuator also cannot move. Thus, when there is an error in the software control program or human error, activating one set of actuators can mechanically prevent the other set of actuators from rotating, thereby preventing the two sets of actuators from moving synchronously and causing the gearbox or electric drive axle to shift gears simultaneously, resulting in damage to the internal structure.

[0022] In this embodiment, the first bearing 3 and the second bearing 4 are respectively installed at both ends of the lead screw 21 in an interference fit manner, and the first bearing 3 and the second bearing 4 are independently clearance fit with the housing.

[0023] 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 dual lead screw actuated gear shift actuator characterized in that it include: Two sets of actuators, each set of actuators including a motor (1), a lead screw mechanism (2) and a toggle mechanism (5); the lead screw mechanism (2) includes a lead screw (21) connected to the motor (1) at one end and a lead screw nut (22) that is linearly mounted on the lead screw (21); the toggle mechanism (5) includes a toggle body (51) rotatably mounted on the housing via a pin (6), a snap-fit ​​connector (53) formed at one end of the toggle body (51) and cooperating with the lead screw nut (22) for synchronous movement, and a toggle head (52) formed at the other end of the toggle body (51). The locking mechanism (8) includes a sliding sleeve (80) fixed on the housing and a sliding pin (81) movably disposed in the sliding sleeve (80). When one of the actuating bodies (51) rotates about the axis of the pin (6), one of the actuating bodies (51) pushes the sliding pin (81) into the other actuating body (51).

2. The dual wire-shaft actuator of claim 1, wherein: The snap-fit ​​connector (53) has a clearance groove (531) for the lead screw (21) to pass through; at least one limiting protrusion (221) is formed on the circumferential surface of the lead screw nut (22), and at least one limiting groove (532) corresponding to the limiting protrusion (221) is provided on the snap-fit ​​connector (53).

3. Double wire rod drive shift actuator according to claim 1 or 2, characterized in that The actuating body (51) has a receiving hole (54) on its side, and the pin (6) is inserted into the receiving hole (54) in a clearance fit manner.

4. The dual wire-shaft actuator of claim 1, wherein: The first bearing (3) and the second bearing (4) are respectively installed at both ends of the lead screw (21) in an interference fit manner. The first bearing (3) and the second bearing (4) are independently clearance-fitted with the housing.

5. The dual-screw drive shift actuator according to claim 1, characterized in that: The end face of the dial (52) in the actuating body (51) is recessed inward to form a dial groove (55), or the two actuating bodies (51) have dial grooves (55) on their opposite sides.

6. The dual-screw drive shift actuator according to claim 5, characterized in that: The sliding pin (81) has push cones (811) at both ends that cooperate with the dial groove (55).

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