Rear axle with pin shift mechanism

Abstract

The utility model discloses a rear axle with a pin gear shifting mechanism, and relates to the field of vehicle parts. Comprising a rear axle body, a transmission device is installed on the rear axle body, a gearbox is installed on the transmission device, and a low-speed gear, a high-speed gear, a splined hub, a gear shifting mechanism and an output gear are arranged on a power output shaft of the gearbox. The power output shaft is sleeved with the low-speed gear and the high-speed gear in a spaced mode, and a first positioning hole and a second positioning hole are formed in the two opposite end faces of the low-speed gear and the high-speed gear correspondingly. The splined hub is fixedly connected to the power output shaft and located between the low-gear gear and the high-gear gear. The gear shifting mechanism comprises a gear shifting pin sleeve and a gear shifting fork connected to the gear shifting pin sleeve, the splined hub is sleeved with the gear shifting pin sleeve, and positioning pins protruding outwards are arranged at the two ends of the gear shifting pin sleeve. The gear shifting mechanism is simple in assembling process, low in production cost and suitable for being used in the low-speed electric vehicle.

Description

Technical Field

[0001] The utility model relates to the field of vehicle components, in particular to a rear axle with a pin shifting mechanism. Background Art

[0002] Low-speed electric vehicles, also known as low-speed electric vehicles, have limited driving speed and range, but they can meet the needs of daily short-distance travel and simple cargo tasks. Therefore, low-speed electric vehicles have the characteristics of practicality and high cost performance. The shift mechanism is the core component of the automobile transmission, which is mainly composed of components such as the shift shaft, the shift fork and the shift synchronizer. The shift shaft is used to connect the gear selector and the transmission. The shift fork is located inside the transmission and is used to achieve the engagement and separation of the gears to complete the shift operation. The shift synchronizer is used to synchronize the speed of the gears and reduce the impact and wear during the shift. However, the shift synchronizer in the existing automobile shift mechanism has a complex structure, which includes components such as the shift sleeve, the synchronizer ring, the locking slider and the slider spring, which makes the processing and assembly process of the shift mechanism complicated, increases the production cost of the automobile, and does not meet the high cost performance characteristics of low-speed electric vehicles. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a rear axle with a pin shifting mechanism, the shifting mechanism has simple processing and assembling processes and low production cost.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0005] A rear axle with a pin shifting mechanism comprises a rear axle body, a transmission device is installed on the rear axle body, a gearbox is installed on the transmission device, a low-speed gear, a high-speed gear, a spline hub, a shifting mechanism and an output gear are arranged on the power output shaft of the gearbox; a low-speed gear and a high-speed gear spacing sleeve are arranged on the power output shaft, and the two end surfaces facing each other on the low-speed gear and the high-speed gear are respectively provided with a first positioning hole and a second positioning hole; the spline hub is fixedly connected to the power output shaft and is located between the low-speed gear and the high-speed gear; the shifting mechanism comprises a shift pin sleeve and a spline hub connected to the power output shaft; The shift fork on the shift pin sleeve, the shift pin sleeve is arranged on the spline hub, and the sleeve cavity side wall of the shift pin sleeve is circumferentially evenly distributed with a plurality of key teeth slidably connected to the spline hub, and outwardly protruding locating pins are provided at both ends of the shift pin sleeve, and the locating pins are adapted to the first locating hole and the second locating hole. After the vehicle stops, the shift pin sleeve is moved to press on the end face of the low-speed gear or the high-speed gear. When the vehicle starts, the locating pin can automatically embed into the first locating hole or the second locating hole due to friction to realize shifting; the output gear is fixedly connected to the power output shaft and is transmission-connected to the transmission device.

[0006] In some embodiments, there are multiple first positioning holes and second positioning holes, and the multiple first positioning holes are distributed in arc shape at intervals on the end face of the low-speed gear, and the multiple second positioning holes are distributed in arc shape at intervals on the end face of the high-speed gear; there are multiple positioning pins, and the multiple positioning pins are distributed in arc shape at intervals on the end face of the shift column pin sleeve. In at least one embodiment, the first positioning hole and the second positioning hole are circular holes; the positioning pin is a cylindrical pin.

[0007] Compared with the prior art, the present invention achieves at least the following beneficial effects:

[0008] The rear axle of the utility model is used to connect the wheels and body of the vehicle, and the torque transmitted by the gearbox is finally transmitted to the wheels through the transmission device, thereby reducing speed and increasing torque to drive the vehicle forward; when shifting gears, the shift fork is used to shift the shift column pin sleeve to the required gear position gear after the vehicle stops, and the shift column pin sleeve is pressed on the end face of the low-speed gear or the high-speed gear. When the vehicle starts, the low-speed gear and the high-speed gear rotate, and the shift column pin sleeve and the end face of the low-speed gear or the high-speed gear generate friction until the locating pin contacts the first locating hole or the second locating hole, and the locating pin can be automatically embedded in the first locating hole or the second locating hole to realize gear shifting; the shifting mechanism of the utility model does not need to be equipped with a shift synchronizer, and shifting is performed through a column pin embedded structure, which can not only well meet the torque demand, but also is simple to process and assemble, and has a low production cost, and is suitable for use in gear shifting of low-speed electric vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] One or more embodiments of the present invention will now be described by way of example only with reference to the accompanying drawings, in which:

[0010] Figure 1 This is a schematic diagram of the structure of an embodiment of the present application;

[0011] Figure 2 A transverse cross-sectional view of a gearbox according to an embodiment of the present application;

[0012] Figure 3 A cross-sectional view of a shift pin sleeve according to an embodiment of the present application;

[0013] Figure 4 This is a cross-sectional view of a power output shaft according to an embodiment of the present application.

[0014] The numbers in the figure are: 1, rear axle body; 2, transmission device; 3, gearbox; 31, power input shaft; 32, intermediate shaft; 33, power output shaft; 4, low-speed gear; 41, first positioning hole; 5, high-speed gear; 51, second positioning hole; 6, spline hub; 7, shift mechanism; 71, shift pin sleeve; 711, positioning pin; 72, shift fork; 8, output gear. DETAILED DESCRIPTION

[0015] The present invention will be described in detail below with reference to the exemplary embodiments in the accompanying drawings. However, it should be understood that the present application can be implemented in a variety of different forms and should not be construed as being limited to the embodiments described herein. These embodiments are provided here to make the disclosure of the present application more complete and to fully convey the concept of the present application to those skilled in the art.

[0016] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, "several" and "multiple" mean two or more, unless otherwise clearly and specifically defined. In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a communication between the two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances. In this application, unless otherwise clearly specified and limited, the first feature "above" or "below" the second feature can include the first and second features directly contacting, or it can include the first and second features not being in direct contact but contacting through another feature between them. Moreover, the first feature "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature include the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0017] like Figures 1 to 4As shown, in one embodiment of the utility model, the rear axle with a pin shift mechanism includes a rear axle body 1, a transmission device 2 is installed on the rear axle body 1, a half shaft is arranged in the rear axle body 1, the inner end of the half shaft is connected to the transmission device 2, a gearbox 3 is installed on the transmission device 2, and a power input shaft 31, an intermediate shaft 32 and a power output shaft 33 connected by gear transmission are arranged in the gearbox 3. The structure of the gearbox 3 is the prior art and will not be described in detail here. The power output shaft 33 of the gearbox 3 is provided with a low-speed gear 4, a high-speed gear 5, a spline hub 6, a shift mechanism 7 and an output gear 8, wherein:

[0018] The low-speed gear 4 and the high-speed gear 5 are sleeved on the power output shaft 33 at intervals and mesh with the gears on the power input shaft 31 or the intermediate shaft 32. The two end surfaces facing each other on the low-speed gear 4 and the high-speed gear 5 are respectively provided with a first positioning hole 41 and a second positioning hole 51.

[0019] The spline hub 6 is fixedly connected to the power output shaft 33 and is located between the low-speed gear 4 and the high-speed gear 5 .

[0020] The shift mechanism 7 includes a shift pin sleeve 71 and a shift fork 72 connected to the shift pin sleeve 71. The shift pin sleeve 71 is sleeved on the spline hub 6, and the sleeve cavity side wall of the shift pin sleeve 71 is evenly distributed with a plurality of key teeth slidably connected to the spline hub 6 along the circumferential direction, so that the shift pin sleeve 71 can move axially along the spline hub 6. The two ends of the shift pin sleeve 71 are provided with outwardly protruding positioning pins 711, which are adapted to the first positioning hole 41 and the second positioning hole 51.

[0021] The output gear 8 is fixedly connected to the power output shaft 33 and is in transmission connection with the transmission device 2 .

[0022] The working principle of the utility model is as follows: the rear axle is used to connect the wheels and the body of the vehicle, and the torque transmitted by the gearbox 3 is finally transmitted to the wheels through the main reducer, inter-wheel differential and other structures provided in the transmission device 2, thereby reducing speed and increasing torque to drive the vehicle forward; (1) When shifting gears, after the vehicle stops, the shift fork 72 is used to shift the shift pin sleeve 71 to the required gear position, and the shift pin sleeve 71 is pressed on the end face of the low-speed gear 4 or the high-speed gear 5. When the vehicle starts, due to the rotation of the low-speed gear 4 and the high-speed gear 5, the shift pin sleeve 71 and the end face of the low-speed gear 4 or the high-speed gear 5 produce Friction is generated until the locating pin 711 contacts the first locating hole 41 or the second locating hole 51. The locating pin 711 can be automatically embedded in the first locating hole 41 or the second locating hole 51, and the shift pin sleeve 71 is synchronized with the speed of the gear. Since the spline hub 6 is fixedly connected to the power output shaft 33, the shift pin sleeve 71 is connected to the spline hub 6 through the key teeth, so that the power output shaft 33 is synchronized with the speed of the gear, and the torque is transmitted to the transmission device 2 through the output gear 8; (2) When in neutral, the locating pin 711 of the shift pin sleeve 71 does not contact any gear and is only connected to the power output shaft 33.

[0023] Optionally, there are multiple first positioning holes 41 and second positioning holes 51, and the multiple first positioning holes 41 are distributed in a circular arc shape at intervals on the end face of the low-speed gear 4, and the multiple second positioning holes 51 are distributed in a circular arc shape at intervals on the end face of the high-speed gear 5; there are multiple positioning pins 711, and the multiple positioning pins 711 are distributed in a circular arc shape at intervals on the end face of the shift pin sleeve 71, and the number of positioning pins 711 at both ends of the shift pin sleeve 71 is respectively matched with the number of the first positioning holes 41 and the second positioning holes 51.

[0024] refer to Figure 3 Optionally, the first positioning hole 41 and the second positioning hole 51 are circular holes; and the positioning pin 711 is a cylindrical pin.

[0025] The shift mechanism 7 of the utility model does not need to be equipped with a shift synchronizer. The shift pin sleeve 71 only needs to be sleeved on the spline hub 6 during assembly. The vehicle's shifting can be achieved by embedding the simple cylindrical locating pin 711 structure into the first locating hole 41 or the second locating hole 51. The embedded shifting structure can not only meet the torque requirements well, but also make the processing and assembly process of the shift mechanism 7 simple, with low production cost. It is suitable for use in the shifting of low-speed electric vehicles, and meets the characteristics of practicality and high cost performance of low-speed electric vehicles.

[0026] It should be understood that all the above embodiments are illustrative rather than restrictive, and any modifications, equivalent changes and modifications made by those skilled in the art to the specific embodiments described above under the conception of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A rear axle with a pin shift mechanism, comprising a rear axle body (1), characterized in that: The rear axle body (1) is provided with a transmission device (2), the transmission device (2) is provided with a gearbox (3), and the power output shaft (33) of the gearbox (3) is provided with a low-speed gear (4), a high-speed gear (5), a spline hub (6), a shift mechanism (7) and an output gear (8); The low-speed gear (4) and the high-speed gear (5) are sleeved on the power output shaft (33) at intervals, and the two end surfaces facing each other on the low-speed gear (4) and the high-speed gear (5) are respectively provided with a first positioning hole (41) and a second positioning hole (51); The spline hub (6) is fixedly connected to the power output shaft (33) and is located between the low-speed gear (4) and the high-speed gear (5); The shift mechanism (7) comprises a shift column pin sleeve (71) and a shift fork (72) connected to the shift column pin sleeve (71); the shift column pin sleeve (71) is sleeved on the spline hub (6); and the sleeve cavity side wall of the shift column pin sleeve (71) is circumferentially evenly distributed with a plurality of key teeth slidably connected to the spline hub (6); outwardly protruding positioning pins (711) are provided at both ends of the shift column pin sleeve (71); the positioning pins (711) are matched with the first positioning hole (41) and the second positioning hole (51); after the vehicle stops, the shift column pin sleeve (71) is moved to press against the end face of the low-speed gear (4) or the high-speed gear (5); when the vehicle starts, the positioning pin (711) can automatically fit into the first positioning hole (41) or the second positioning hole (51) due to friction to achieve shifting; The output gear (8) is fixedly connected to the power output shaft (33) and is in transmission connection with the transmission device (2).

2. The rear axle with a pin shift mechanism according to claim 1, characterized in that: A plurality of the first positioning holes (41) and the second positioning holes (51) are provided, and the plurality of the first positioning holes (41) are distributed in an arc shape at intervals on the end surface of the low-speed gear (4), and a plurality of the second positioning holes (51) are distributed in an arc shape at intervals on the end surface of the high-speed gear (5); a plurality of the positioning pins (711) are provided, and the plurality of the positioning pins (711) are distributed in an arc shape at intervals on the end surface of the shift column pin sleeve (71).

3. The rear axle with a pin shift mechanism according to claim 2, characterized in that: The first positioning hole (41) and the second positioning hole (51) are circular holes; and the positioning pin (711) is a cylindrical pin.

Images