A variable speed switching assembly and gear structure for a transmission

Abstract

The application provides a gear shift assembly and a gear structure for a gearbox, comprising: a conversion shaft coaxially connected with a coupling and a conversion gear, the conversion shaft is further provided with a protrusion for limiting the rotation angle of the coupling, the conversion gear is provided with a limiting piece capable of being clamped with the coupling; a guide surface arranged on the limiting piece and / or the coupling to push the coupling to deflect; and a pushing mechanism connected with the coupling to push the coupling to slide along the axial direction. The application solves the problem that the existing gear shift assembly needs the motor to drive the conversion shaft and the coupling to rotate in advance, otherwise the coupling cannot be smoothly engaged with the conversion gear, and the gear shifting fails.

Description

Technical Field

[0001] This invention relates to the technical field of gearboxes, and more particularly to a gear shifting component and a gear structure for gearboxes. Background Technology

[0002] Existing electric vehicles typically use a two-speed transmission for shifting. For example, the patent with application number CN202020060522.1 coaxially mounts a connecting member and two shift gears on the same shift shaft. The end faces of the two shift gears are provided with multiple keyways that can mesh with the connecting member. The connecting member can then be pushed to slide along the shift shaft so that it can selectively mesh with the keyway on the shift gear, thereby driving the connecting member to rotate. By meshing with shift gears with different gear ratios, the electric vehicle can ultimately achieve the function of shifting speeds.

[0003] However, during gear shifting in the aforementioned transmission, the connecting component needs to slide axially along the shift shaft and engage with the keyway. Since the rotated connecting component cannot directly align with the keyway of the shift gear, the motor must provide power or rotational speed to the shift shaft in advance to drive the connecting component to rotate until it aligns with the keyway and successfully engages. In other words, in existing electric vehicles, when shifting gears using this structure while stationary, the motor needs to drive the shift shaft and connecting component to rotate in advance; otherwise, the connecting component may fail to engage smoothly with the shift gear, leading to gear shifting failure. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the first objective of this invention is to provide a gear shifting assembly that solves the problem that, when an electric vehicle is shifting gears while stationary, existing gear shifting assemblies require the motor to drive the shifting shaft and connecting parts to rotate in advance, otherwise the connecting parts may fail to mesh smoothly with the shifting gear, leading to gear shifting failure.

[0005] According to an embodiment of the present invention, a speed switching component includes:

[0006] A conversion shaft is coaxially rotatably connected to a connecting member and a conversion gear. The conversion shaft is also provided with a protrusion for limiting the rotation angle of the connecting member, and the conversion gear is provided with a limiting member that can engage with the connecting member.

[0007] A guide surface, disposed on the limiting member and / or the connecting member, to drive the connecting member to deflect;

[0008] And a propulsion mechanism, which is connected to the connecting member to push the connecting member to slide along its axial direction.

[0009] Compared with the prior art, the present invention has the following beneficial effects: the propulsion mechanism drives the connecting part to slide until it contacts the guide surface on the limiting part / connecting part and the connecting part / limiting part. At this time, under the oblique drive of the guide surface, the connecting part is forced to deflect until it is locked in the limiting part. That is, when switching and engaging the gear, the present invention does not need to provide a source of power to the conversion shaft in advance to make it rotate. Under the linear push of the propulsion mechanism itself, the connecting part can be deflected spontaneously by the guide surface until it is locked in the limiting part.

[0010] According to one embodiment, the limiting member includes a first internal tooth coaxially disposed on the conversion gear;

[0011] The connector includes a body and a first external tooth disposed on the body, the first external tooth being able to engage with a first internal tooth.

[0012] According to one embodiment, the limiting member includes a second external tooth protruding toward the connecting member;

[0013] The connector includes a body and a second inner tooth disposed on the ring side of the body, wherein the groove of the second inner tooth and the body form a slot for engaging the second outer tooth.

[0014] According to one embodiment, the maximum rotation angle of the connector is an integer multiple of the ratio of the arc between two adjacent teeth on the connector.

[0015] According to one embodiment, the guide surface is triangular.

[0016] According to one embodiment, the guide surfaces are respectively disposed on the opposing tooth surfaces of the connecting member and the limiting member.

[0017] According to one embodiment, the protrusion includes a key that protrudes axially along the conversion axis, and the ratio of the number of teeth on the connector to the number of the key is 3:1.

[0018] The second objective of this invention is to provide a gear structure for a transmission that solves the problem in the prior art where, when an electric vehicle uses a two-speed transmission for gear shifting, the motor needs to drive the conversion shaft and connecting parts to rotate in advance, otherwise the connecting parts may not be able to mesh smoothly with the conversion gear, leading to gear shifting failure.

[0019] According to an embodiment of the present invention, a gear structure for a gearbox includes:

[0020] A conversion shaft is coaxially rotatably connected to a connecting member and a conversion gear. There are two conversion gears, which are distributed on both sides of the connecting member. The conversion shaft is equipped with a power mechanism for driving its rotation, and the conversion shaft is also provided with a protrusion for limiting the rotation angle of the connecting member. Each of the above conversion gears is provided with a limiting member that can be selectively engaged with the connecting member.

[0021] A guide surface, disposed on the limiting member and / or the connecting member, to drive the connecting member to deflect;

[0022] And a propulsion mechanism, which is connected to the connecting member to push the connecting member to slide along its axial direction.

[0023] Compared with the prior art, the present invention has the following beneficial effects: the propulsion mechanism drives the connecting part to slide until it contacts the guide surface on the limiting part / connecting part and the connecting part / limiting part. At this time, under the oblique drive of the guide surface, the connecting part is forced to deflect until it is locked in the limiting part. Then, under the drive of the power mechanism, the conversion shaft, the connecting part and one of the conversion gears are driven to rotate together, thereby completing the gear shifting. That is, when shifting gears, the present invention does not need to provide a source power to the conversion shaft in advance to make it rotate. Under the linear push of the propulsion mechanism itself, the connecting part is automatically deflected by the guide surface until it is locked in with any limiting part.

[0024] According to one embodiment, the propulsion mechanism includes:

[0025] A connecting rod, one end of which is rotatably connected to the connecting member along the conversion shaft;

[0026] And a pull rod, which is fixedly connected to the other end of the connecting rod to drive the connecting rod to move axially along the conversion shaft.

[0027] According to one embodiment, the connector further includes:

[0028] A central groove, which is annular in shape, is used to accommodate the connecting rod;

[0029] And a connecting gear, which includes a first connecting gear and a second connecting gear distributed on both sides of the receiving groove, wherein the first connecting gear and the second connecting gear are respectively positioned opposite the two conversion gears. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the gear structure for a gearbox in this invention.

[0031] Figure 2 for Figure 1 Exploded view.

[0032] Figure 3This is a simplified diagram when the connecting component has an internal tooth structure.

[0033] Figure 4 For connecting parts with different numbers of teeth and keyways.

[0034] In the above attached diagram: 1. Conversion axis;

[0035] 2. Connecting component; 201. First connecting gear; 202. Second connecting gear; 203. Intermediate groove; 211. Guide surface; 212. First external tooth; 213. Keyway; 214. Second internal tooth; 215. Slot;

[0036] 3. Gear changer; 4. Key;

[0037] 5. Limiting component; 501. First internal tooth;

[0038] 6. Propulsion mechanism; 601. Clamping part; 602. Rod part; 603. Connecting part; 604. Pull rod. Detailed Implementation

[0039] The technical solutions of the present invention will be further described below with reference to the accompanying drawings and embodiments. It should be understood that, without conflict, the various embodiments and features of the present invention can be combined with each other.

[0040] like Figure 1 as well as Figure 2 As shown, this embodiment of the invention proposes a speed switching component, including: a conversion shaft 1, a guide surface 211, and a propulsion mechanism 6, wherein,

[0041] A connecting member 2 and a conversion gear 3 are coaxially rotatably connected to the conversion shaft 1. Three keys 4 are fixed on the conversion shaft 1, and the three keys are evenly distributed on the circumferential side of the conversion shaft 1. The inner circumferential side of the connecting member 2 is provided with three keyways 213 for accommodating the three keys 4. The width of the keyway 213 is longer than the width of the key 4. In this structure, the connecting member 2 can be limited by the protruding key 4 after deflecting a certain angle on the conversion shaft 1, and rotate with the conversion shaft 1. At the same time, the conversion gear 3 is provided with a limiting member 5 that can engage with the connecting member 2.

[0042] Specifically, such as Figure 2 As shown, the connecting member 2 includes a ring-shaped body and a first external tooth 212 fixed on the outer ring side of the body and protruding outward. At this time, the limiting member 5 includes a first internal tooth 501 coaxially fixed on the inner ring of the conversion gear 3 and protruding inward. The shape and tooth pitch of the first external tooth 212 are the same as those of the first internal tooth 501. When the connecting member 2 and the conversion gear 3 are aligned, the first external tooth 212 can be engaged with the first internal tooth 501.

[0043] In another embodiment, combined Figure 2 as well as Figure 3 As shown, the connector 2 may further include a ring-shaped body, and a second internal tooth 214 (see here for reference) fixed on the outer ring side of the body and protruding in the direction of its axis. Figure 3 The top surface of the second internal tooth 214 is connected to the outer ring side of the body. The limiting member 5 includes a second external tooth that is coaxially disposed on the end face of the conversion gear 3 and protrudes toward the connecting member 2. Similarly, the size and pitch of the second external tooth and the second internal tooth 214 are the same. When the connecting member 2 is aligned with the conversion gear 3, the second external tooth can be just fitted into the slot 215 formed between the second internal tooth 214 and the body connected to it.

[0044] The maximum rotation angle of the connector 2 is an integer multiple of the ratio of the arc between two adjacent teeth (i.e., the first external tooth 212 or the second internal tooth) on the connector 2. In this embodiment, the ratio is 2:1, and the ratio of the number of the first external tooth 212 or the second internal tooth fixed on the body of the connector 2 to the number of the key 4 is 3:1. Specifically, there are 9 of the first external tooth 212 or the second internal tooth, and the arc between two adjacent teeth is 40°. The maximum deflection angle of the connector 2 on the conversion shaft 1 is 80°. With the above settings, when the connector 2 and the limiting member 5 are engaged, the connector 2 has the best deflection angle to ensure that it deflects smoothly until it is aligned with the limiting member 5.

[0045] It should be noted that the specific number of keyways 213 and the specific number of first external teeth 213 given above should not be construed as a limitation on the present invention, but only as providing an optimal implementation method, such as... Figure 4 As shown, the keyway 213 can actually be set to 5, and at the same time, the conversion shaft 1 is provided with 5 keys 4, and the number of teeth of the first external tooth 212 can also be set to 14.

[0046] The guide surface 211 is disposed on the limiting member 5 and / or the connecting member 2 to push the connecting member 2 to deflect. In this embodiment, the guide surface 211 is simultaneously disposed on the tooth surfaces of the first external tooth 212 and the first internal tooth 501 facing each other. The specific shape of the guide surface 211 is not limited, and can be a conventional trapezoidal surface or arc surface, etc.

[0047] Furthermore, in order to reduce the time it takes for the guide surface 211 to push the connector 2 to deflect until the connector 2 is engaged with the limiting member 5, the guide surface 211 is triangular, so that when the connector 2 contacts the teeth on the limiting member 5, the connector 2 only needs to slide on the tooth surface and deflect by a maximum of 10° to align with the limiting member 5.

[0048] The propulsion mechanism 6 is connected to the connecting member 2 to push the connecting member 2 to slide along its axial direction; the connection position between the output end of the propulsion mechanism 6 and the connecting member 2 is not limited. In particular, when only one conversion gear 3 is provided, the output end can be a ring or arc that is rotatably connected to the body of the connecting member 2, or it can be a push rod that abuts against the end face of the connecting member 2 away from the conversion gear 3. The power source of the propulsion mechanism 6 can be manual shifting, a cylinder or other mechanism with linear propulsion function.

[0049] The present invention also provides a gear structure for a gearbox, including: a conversion shaft 1, a connecting member 2, a conversion gear 3, and a propulsion mechanism 6, which are arranged in the same manner as described above. The difference between this embodiment and the above embodiment is that in this embodiment, a power mechanism for driving the conversion shaft 1 to rotate is connected to the conversion shaft 1. Typically, the power mechanism is a motor, which can transmit torque to the conversion shaft 1 through a gear set meshing with it. At the same time, there are two conversion gears 3 arranged opposite to each other in this embodiment. They are a first conversion gear located on the left side of the connecting member 2 and a second conversion gear located on the right side of the connecting member 2, and the two are distributed on both sides of the connecting member 2 along its axial direction. Correspondingly, for the two conversion gears 3, the two sides of the connecting member 2 are respectively provided with a first connecting gear 201 and a second connecting gear 202 that can engage with the limiting member 5 on each of the conversion gears 3. Similarly, each of the connecting gears can be an external gear or an internal gear. When the connecting member 2 is moved from one conversion gear 3 to another conversion gear 3, its output speed can be changed by meshing with gears with different gear ratios on different conversion gears 3, thereby realizing the function of speed change.

[0050] In this embodiment, the aforementioned propulsion mechanism 6 includes a connecting rod and a pull rod 604 formed by a connecting part 603, a rod part 602, and a clamping part 601 sequentially and fixedly connected.

[0051] The connecting part 603 on the connecting rod is fixedly connected to the pull rod 604. It should be understood that the fixed connection here means that the two do not slide relative to each other. The implementation method is not limited, such as interference fit or adding a limiting protrusion on the pull rod 604.

[0052] One end of the rod 602 is fixedly connected to the connecting part 603, and the other end is fixedly connected to the clamping part 601;

[0053] The clamping part 601 is rotatably connected to the connecting member 2. Specifically, the middle part of the connecting member 2 is recessed inward to form an annular intermediate groove 203. The clamping part 601 is rotatably connected in the intermediate groove 203. With the above structure, when the pull rod 604 moves along its axial direction, it can drive the connecting rod to move in the same direction as it. Then, the clamping part 601 is used to move the groove wall of the intermediate groove 203, and finally drive the connecting member 2 to slide on the conversion shaft 1. Furthermore, in order to facilitate the clamping part 601 to move the groove wall of the intermediate groove 203 and to facilitate installation and maintenance, the clamping part 601 is semi-circular and fits with the intermediate groove 203 with a clearance.

[0054] The working process of this invention is as follows: Pulling the lever 604 causes the clamping part 601 and the connecting member 2 to slide together. When the first connecting gear 201 on the connecting member 2 contacts the first internal tooth 501 on the left-end conversion gear 3, since the connecting member 2 has a certain degree of deflection freedom on the conversion shaft 1, the connecting member 2 is forced to deflect under the push of the inclined surface of the triangular guide surface 211 until the first connecting gear 201 and the first internal tooth 501 are just engaged. Then, under the drive of the power mechanism, the conversion shaft 1 rotates and drives the connecting member 2 and the engaged conversion gear 3 to rotate together through the key 4 set on the conversion shaft 1. When speed change is required, the lever 604 can be pulled in the opposite direction to make the second connecting gear 202 on the connecting member 2 engage with the right-side conversion gear 3. By meshing the two conversion gears 3 with gears of different gear ratios, speed change can be completed.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A speed switching component, characterized in that, include: A conversion shaft (1) is coaxially rotatably connected to a connecting member (2) and a conversion gear (3). The conversion shaft (1) is also provided with a protrusion for limiting the rotation angle of the connecting member (2). The conversion gear (3) is provided with a limiting member (5) that can engage with the connecting member (2). A guide surface (211) is disposed on the limiting member (5) and / or the connecting member (2) to push the connecting member (2) to deflect; And a propulsion mechanism (6), which is connected to the connecting member (2) to push the connecting member (2) to slide along its axial direction.

2. The speed switching component as described in claim 1, characterized in that: The limiting member (5) includes a first internal tooth (501) coaxially disposed on the conversion gear (3); The connector (2) includes a body and a first external tooth (212) disposed on the body, the first external tooth (212) being able to engage with a first internal tooth (501).

3. The speed switching component as described in claim 1, characterized in that: The limiting member (5) includes a second external tooth protruding toward the connecting member (2); The connector (2) includes a body and a second inner tooth (214) disposed on the ring side of the body. The tooth groove of the second inner tooth (214) forms a slot (215) between the tooth groove of the second inner tooth (214) and the body for engaging the second outer tooth.

4. A speed switching component as described in claim 2 or 3, characterized in that: The maximum rotation angle of the connector (2) is an integer multiple of the ratio of the arc between two adjacent teeth on the connector (2).

5. A speed switching component as described in claim 4, characterized in that: The guide surface (211) is triangular.

6. A speed switching component as described in claim 5, characterized in that: The guide surface (211) is respectively disposed on the opposing tooth surfaces of the connecting member (2) and the limiting member (5).

7. A speed switching component as described in claim 4, characterized in that: The protrusion includes a key (4) protruding axially along the conversion shaft (1), and the ratio of the number of teeth on the connecting member (2) to the number of teeth on the key (4) is 3:

1.

8. A gear structure for a gearbox, characterized in that, include: A conversion shaft (1) is coaxially rotatably connected to a connecting member (2) and a conversion gear (3). There are two conversion gears (3) and they are distributed on both sides of the connecting member (2). A power mechanism for driving its rotation is provided on the conversion shaft (1). The conversion shaft (1) is also provided with a protrusion for limiting the rotation angle of the connecting member (2). Each of the above conversion gears (3) is provided with a limiting member (5) that can be selectively engaged with the connecting member (2). A guide surface (211) is disposed on the limiting member (5) and / or the connecting member (2) to push the connecting member (2) to deflect; And a propulsion mechanism (6), which is connected to the connecting member (2) to push the connecting member (2) to slide along its axial direction.

9. A gear structure for a gearbox as described in claim 8, characterized in that, The propulsion mechanism (6) includes: A connecting rod, one end of which is rotatably connected to the connecting member (2) along the axial direction of the conversion shaft (1); And a pull rod (604), which is fixedly connected to the other end of the connecting rod to drive the connecting rod to move axially along the conversion shaft (1).

10. A gear structure for a gearbox as described in claim 9, characterized in that, The connecting member (2) also includes: An intermediate groove (203) is annular to accommodate the connecting rod; And connecting gears, including a first connecting gear (201) and a second connecting gear (202) distributed on both sides of the intermediate groove (203), the first connecting gear (201) and the second connecting gear (202) being respectively positioned opposite the two conversion gears (3).

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