Synchronous gear shifting mechanism and rear gearbox
By designing the synchronous shift mechanism of the inclined structure and the annular groove fork in the transmission, the problems of lag and abnormal noise during shifting in the prior art are solved, and a smoother shifting process and longer gears are achieved. life.
Patent Information
- Application Number
- CN202421202338.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-29
- Publication Date
- 2025-01-07
- Estimated Expiration
- 2034-05-29
AI Technical Summary
The existing transmission synchronization mechanism is prone to lag and abnormal noise when shifting gears, resulting in serious wear of gears, especially when switching between high-speed and low-speed gears, which makes the passenger experience poor.
A synchronous gear shifting mechanism is designed, including transmission shaft, gear gear, neutral gear, synchronous gear and gear reduction gear. The inclined structure and annular groove fork are used to ensure the synchronous gear and neutral gear and gear position. The gear meshing is smoother, reducing pause and wear.
It achieves smoother gear shifting, reduces the feeling of clogging and wear during meshing between gear teeth, and extends the service life of the gearbox.
Smart Images
Figure CN222315898U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of gearboxes, in particular to a synchronous shifting mechanism and a rear gearbox. Background Art
[0002] The transmission is a mechanism used to change the speed and torque from the engine. It can change the transmission ratio of the output shaft and the input shaft in a fixed or step-by-step manner. It is also called a gearbox. In order to ensure smooth, impact-free, light and easy-to-operate gear shifting, current transmissions all use synchronous mechanisms for gear shifting.
[0003] The existing transmission synchronization mechanism generally uses a sliding gear to achieve gear shifting synchronization, that is, the gear shifting synchronization is achieved by meshing the internal splines of the sliding gear with the external splines of the shift teeth. In order to facilitate the engagement, the number of teeth on the internal splines of most sliding gears and the external splines of the shift teeth is relatively sparse. Although this setting facilitates the convenience of gear shifting, when shifting, the engagement of the two is prone to jamming and abnormal noise, which leads to serious gear wear and greatly shortens its life, especially when switching between high and low gears, the frustration is more serious, and the passenger experience is not good. Utility Model Content
[0004] In view of the deficiencies in the prior art, the utility model provides a synchronous shifting mechanism and a rear-mounted transmission to solve the technical problem in the related technology that, when the transmission synchronization mechanism shifts gears, the meshing of the internal splines of the sliding gear and the external splines of the shift teeth is prone to produce jamming and abnormal noise, thereby causing serious gear wear and greatly shortening their lifespan, especially when switching between high-speed gear and low-speed gear, resulting in more serious jerking and a poor passenger experience.
[0005] The utility model provides a synchronous shifting mechanism and a rear gearbox, comprising a transmission shaft:
[0006] The transmission shaft is provided with an upshift gear, an idler gear, a synchronous gear sleeve and a downshift gear in sequence along its axial direction, the idler gear rotates with the transmission shaft, the synchronous gear sleeve can slide axially on the transmission shaft, the upshift gear and the downshift gear are axially fixed on the transmission shaft and rotate relative to the transmission shaft;
[0007] The upshift gear and the downshift gear are provided with coaxial gears on both sides facing each other;
[0008] Both ends of the gear teeth on the opposite side of the gear position gear of the upshift gear and the gear position gear of the downshift gear are inclined surface structures, and both ends of the gear teeth on both sides of the synchronous gear sleeve and the neutral gear are inclined surface structures;
[0009] The synchronous gear sleeve can mesh with the neutral gear and the first gear gear at the same time to achieve the connection between the neutral gear and the upshift gear or the downshift gear, so that the upshift gear or the downshift gear drives the transmission shaft to rotate.
[0010] Furthermore, the number of teeth of the synchronous gear sleeve is the same as the number of teeth of the two-speed gears and the neutral gear, and the number of teeth is 16-20.
[0011] Furthermore, the upshift gear and the downshift gear have different diameters.
[0012] Furthermore, an annular groove is provided on the outer peripheral surface of the synchronous gear sleeve, and a shift fork is inserted into the annular groove.
[0013] Furthermore, the transmission shaft is provided with a plurality of transmission gears with different diameters, and the transmission gears can drive the transmission shaft to rotate or rotate with the transmission shaft.
[0014] Furthermore, a protrusion is provided on the transmission shaft, the neutral gear has a through hole, a recessed portion matching the protrusion is provided in the through hole, wherein the number of the recessed portions is multiple, the multiple recessed portions are evenly distributed in the through hole, and the number of the protrusions corresponds to the number of the recessed portions, and the multiple protrusions are evenly distributed on the outer circumferential surface of the transmission shaft.
[0015] Furthermore, bearings are respectively provided at two opposite ends of the transmission shaft.
[0016] The utility model also provides a rear-mounted gearbox, comprising the above-mentioned synchronous shifting mechanism.
[0017] Compared with the prior art, the utility model has the following beneficial effects:
[0018] The synchronous shift mechanism of the utility model, when performing an upshift or downshift operation, moves the synchronous gear sleeve and cooperates with the inclined surface structure of the gear teeth of each gear to make it easier to mesh with the neutral gear and the gear position gear of the upshift gear or the gear position gear of the downshift gear, so that the gear shifting is smoother and the frustration and wear when the gear teeth are meshed are reduced. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 It is a schematic diagram of a synchronous shifting mechanism according to an embodiment of the utility model;
[0020] Figure 2 It is a schematic diagram of a synchronous shifting mechanism according to an embodiment of the utility model, without showing the synchronous gear sleeve;
[0021] Figure 3 It is a schematic diagram of a synchronous gear sleeve in a synchronous shifting mechanism according to an embodiment of the utility model;
[0022] Figure 4It is a schematic diagram of a neutral gear in a synchronous shifting mechanism according to an embodiment of the utility model;
[0023] Description of Figure Numbers:
[0024] 100. Transmission shaft;
[0025] 110, add gear;
[0026] 120, neutral gear; 121, recessed portion;
[0027] 130, synchronous gear sleeve; 131, annular groove;
[0028] 140, downshift gear;
[0029] 150, raised portion;
[0030] 200, gear position gear; 300, shift fork; 400, transmission gear; 500, bearing.
[0031] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION
[0032] In order to make the purpose, technical solution and beneficial effects of the utility model more clear, the technical solution of the utility model is further described below in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.
[0033] In the description of the utility model, it should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of the specification are only used to match the contents disclosed in the specification for people familiar with the technology to understand and read, and are not used to limit the limiting conditions that the utility model can be implemented, so they have no substantial technical significance. Any modification of the structure, change of the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the utility model without affecting the effect that the utility model can produce and the purpose that can be achieved. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the utility model. The change or adjustment of the relative relationship should also be regarded as the scope of the implementation of the utility model without substantial change of the technical content.
[0034] like Figure 1-2 As shown, an embodiment of the utility model provides a synchronous shifting mechanism, including a transmission shaft 100:
[0035] The transmission shaft 100 is provided with an upshift gear 110, an idler gear 120, a synchronous gear sleeve 130 and a downshift gear 140 in sequence along its axial direction. The idler gear 120 rotates with the transmission shaft 100, the synchronous gear sleeve 130 can slide axially on the transmission shaft 100, and the upshift gear 110 and the downshift gear 140 are axially fixed on the transmission shaft 100 and rotate relative to the transmission shaft 100;
[0036] The upshift gear 110 and the downshift gear 140 are provided with coaxial gears 200 on both sides facing each other, and the upshift gear 110 and the downshift gear 140 can be connected to the transmission shaft 100 through the gear gear 200 to achieve synchronous rotation;
[0037] Both ends of the gear teeth on the opposite side of the gear position gear 200 of the upshift gear 110 and the gear position gear 200 of the downshift gear 140 are inclined surface structures, and both ends of the gear teeth on both sides of the synchronous gear sleeve 130 are inclined surface structures. Through the inclined surface structure, even if the number of gear teeth is dense, the synchronous gear sleeve 130 can mesh with the gear position gear 200 more smoothly, thereby reducing the jamming and abnormal noise generated during gear shifting;
[0038] The synchronous gear sleeve 130 can mesh with the neutral gear 120 and the first gear gear 200 at the same time to achieve the connection between the neutral gear 120 and the upshift gear 110 or the downshift gear 140, so that the upshift gear 110 or the downshift gear 140 drives the transmission shaft 100 to rotate.
[0039] In the embodiment of the utility model, when performing an upshift or downshift operation, by moving the synchronous gear sleeve 130 and cooperating with the inclined surface structure of each gear tooth, it is easier to mesh with the neutral gear 120 and the gear gear 200 of the upshift gear 110 or the gear gear 200 of the downshift gear 140, making the gear shifting smoother, thereby reducing the sense of frustration and wear when the gear teeth are meshed.
[0040] like Figure 1-3 As shown, in an embodiment of the utility model, a protrusion 150 is provided on the transmission shaft 100, and the transmission gear 400 has a through hole, and a recessed portion 121 matching the protrusion 150 is provided in the through hole, wherein the number of the recessed portions 121 is multiple, and the multiple recessed portions 121 are evenly distributed in the through hole, and the number of the protrusions 150 corresponds to the number of the recessed portions 121, and the multiple protrusions 150 are evenly distributed on the outer peripheral surface of the transmission shaft 100, and the transmission gear 400 is easily installed and disassembled through the protrusions 150 and the recessed portions 121, thereby facilitating maintenance and replacement.
[0041] like Figure 1-4As shown, in the embodiment of the utility model, the number of teeth of the synchronous gear sleeve 130 is the same as the number of teeth of the two-speed gear 200 and the neutral gear 120, and the number of teeth is 16-20. By setting a certain number of teeth, the synchronous gear sleeve 130 and the two-speed gear 200 maintain the same speed, reducing the jamming or abnormal noise during the gear shifting process, thereby reducing the wear between the gears and correspondingly extending the service life of the gearbox.
[0042] like Figure 1-2 As shown, in the embodiment of the present utility model, the diameters of the upshift gear 110 and the downshift gear 140 are different to achieve different transmission ratios, which can meet the power output in different situations.
[0043] like Figure 1 and Figure 3 As shown, in the embodiment of the utility model, the outer circumferential surface of the synchronous gear sleeve 130 is provided with an annular groove 131, and the annular groove 131 is inserted with a shift fork 300, so that the synchronous gear sleeve 130 is driven by the shift fork 300 to move along the axial direction of the transmission shaft 100, and the shift fork 300 is arranged in the annular groove 131 with a gap, so that when the synchronous gear sleeve 130 rotates, the shift fork 300 can still remain motionless, thereby improving stability; in specific use, when it is necessary to switch to an upshift, the shift fork 300 is operated to drive the synchronous gear sleeve 130 to move along the upshift gear 11 0 until the synchronous gear sleeve 130 is meshed with the neutral gear 120 and the gear position gear 200 of the upshift gear 110, thereby realizing the reversing of upshifting; when it is necessary to switch to downshifting, the shift fork 300 is operated to drive the synchronous gear sleeve 130 to move in the direction toward the downshifting gear 140 until the synchronous gear sleeve 130 is meshed with the neutral gear 120 and the gear position gear 200 of the downshifting gear 140, thereby realizing the reversing of upshifting; when the synchronous gear sleeve 130 is only meshed with the neutral gear 120, the transmission shaft 100 does not rotate with the gear, and thus does not output power.
[0044] like Figure 1-2As shown, in the embodiment of the utility model, a plurality of transmission gears 400 are further provided on the transmission shaft 100. The transmission gears 400 can be splined or integrally arranged on the transmission shaft 100, and the diameters of the plurality of transmission gears 400 are different to achieve different transmission ratios; the transmission gears 400 can drive the transmission shaft 100 to rotate or rotate with the transmission shaft 100, that is, power can be input to the transmission shaft 100 through the transmission gears 400 or power can be output from the transmission shaft 100 through the transmission gears 400. For example, in the present embodiment, two transmission gears 400 are provided, and the one located at the left end of the transmission shaft 100 is a power input gear, through which power is input to the transmission shaft 100 to make it rotate; the one located at the right end of the transmission shaft 100 is a power output gear, through which power output of the transmission shaft 100 is achieved, so as to achieve power input to the transmission shaft 100 and then power output through two transmission gears 400.
[0045] like Figure 1-2 As shown, in the embodiment of the utility model, bearings 500 are respectively provided at the opposite ends of the transmission shaft 100. The setting of the bearings 500 enhances the radial stability of the transmission shaft 100 and reduces the resistance to shaft rotation. The bearings 500 can be connected to the shaft by interference fit, and the transmission shaft 100 can be installed on the housing through the bearings 500.
[0046] A rear-mounted gearbox is also provided in this embodiment, wherein the rear-mounted gearbox includes the above-mentioned synchronous shifting mechanism. Since all the technical solutions of the above-mentioned embodiments are adopted in this embodiment, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, and thus they are not described one by one here.
[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.
Claims
1. A synchronous shifting mechanism, characterized in that: The transmission shaft (100) includes: The transmission shaft (100) is provided with an upshift gear (110), an idler gear (120), a synchronous gear sleeve (130) and a downshift gear (140) in sequence along its axial direction; the idler gear (120) rotates with the transmission shaft (100); the synchronous gear sleeve (130) can slide axially on the transmission shaft (100); the upshift gear (110) and the downshift gear (140) are axially fixed on the transmission shaft (100) and rotate relative to the transmission shaft (100); The upshift gear (110) and the downshift gear (140) are respectively provided with coaxial gear position gears (200) on opposite sides thereof; Both ends of the gear teeth on the opposite side of the gear position gear (200) of the upshift gear (110) and the gear position gear (200) of the downshift gear (140) are inclined surface structures, and both ends of the gear teeth on both sides of the synchronous gear sleeve (130) and the neutral gear (120) are inclined surface structures; The synchronous gear sleeve (130) can mesh with the neutral gear (120) and the first gear gear (200) at the same time to achieve the connection between the neutral gear (120) and the upshift gear (110) or the downshift gear (140), so that the upshift gear (110) or the downshift gear (140) drives the transmission shaft (100) to rotate.
2. A synchronous shifting mechanism according to claim 1, characterized in that: The transmission shaft (100) is provided with a protrusion (150); the neutral gear (120) has a through hole, and a recessed portion (121) matching the protrusion (150) is provided in the through hole, wherein the number of the recessed portions (121) is multiple, and the multiple recessed portions (121) are evenly distributed in the through hole, and the number of the protrusions (150) corresponds to the number of the recessed portions (121), and the multiple protrusions (150) are evenly distributed on the outer peripheral surface of the transmission shaft (100).
3. A synchronous shifting mechanism according to claim 1, characterized in that: The number of teeth of the synchronous gear sleeve (130) is the same as the number of teeth of the two-speed gear (200) and the neutral gear (120), and the number of teeth is 16-20.
4. A synchronous shifting mechanism according to claim 1, characterized in that: The upshift gear (110) and the downshift gear (140) have different diameters.
5. A synchronous shifting mechanism according to claim 1, characterized in that: An annular groove (131) is provided on the outer peripheral surface of the synchronous gear sleeve (130), and a shift fork (300) is inserted into the annular groove (131).
6. A synchronous shifting mechanism according to claim 1, characterized in that: The transmission shaft (100) is also provided with a plurality of transmission gears (400) having different diameters, and the transmission gears (400) can drive the transmission shaft (100) to rotate or rotate along with the transmission shaft (100).
7. A synchronous shifting mechanism according to claim 1, characterized in that: Bearings (500) are respectively provided at the opposite ends of the transmission shaft (100).
8. A rear gearbox, characterized in that: It comprises a synchronous shifting mechanism as described in any one of claims 1 to 7.