A transfer case for an all-terrain vehicle

Abstract

A kind of transfer structure of all-terrain vehicle transmission, including transmission, transfer, transmission is fixedly connected connecting plate, transfer housing supports input shaft, input shaft one end extends out of the shell, insert into transmission, the shaft section of input shaft in transmission is fixedly installed transfer input gear, transfer input gear is engaged with transmission output gear, the shaft section of input shaft in transfer is fixedly installed driving gear, transfer output end includes front drive output gear shaft, rear drive output gear shaft, the axis of front drive output gear shaft, rear drive output gear shaft is located at the same straight line, is supported in transfer respectively by bearing, the opposite end of front drive output gear shaft and rear drive output gear shaft is slidably fitted by bearing, rear drive output gear shaft is provided with driven gear and combination tooth, driving gear is connected with driven gear by the over wheel on intermediate shaft, spline fit engagement tooth sleeve on front drive output gear shaft, engagement tooth sleeve is actuated by front drive shift fork, for with combination tooth engages or separates.

Description

Technical Field

[0001] This utility model relates to the field of all-terrain vehicles. Specifically, it relates to a transmission transfer structure for an all-terrain vehicle. Background Technology

[0002] Most existing all-terrain vehicles still use a traditional drive layout, relying solely on the rear wheels for two-wheel drive. While this structure can meet the needs of daily driving on flat roads, it often makes it difficult to guarantee the vehicle's passability and stability in complex terrains such as muddy, steep slopes, and gravel roads. Therefore, achieving four-wheel drive has become a key requirement for improving the performance and applicability of all-terrain vehicles.

[0003] However, upgrading from two-wheel drive to four-wheel drive typically requires adding a transfer case to the power transmission system. The transfer case distributes the engine's power output to the front and rear wheels, thus achieving four-wheel drive. However, some all-terrain vehicles are limited by their overall structural design or body size, resulting in extremely compact chassis and engine compartments that cannot accommodate a separate transfer case. This rigid spatial constraint has created a technical bottleneck for these all-terrain vehicles in pursuing four-wheel drive functionality. Therefore, how to enable four-wheel drive in these space-constrained all-terrain vehicles has long been a pressing technical challenge for the industry. Summary of the Invention

[0004] To address the aforementioned problems, this utility model provides a transfer case structure for an all-terrain vehicle's transmission. By extending the input shaft of the transfer case into the transmission housing and directly connecting it to the output gear of the transmission, it shortens the installation distance, resulting in a compact structure that enables all-terrain vehicles that cannot be equipped with an independent transfer case to achieve four-wheel drive.

[0005] The technical solution of this utility model is as follows: a transmission transfer mechanism for an all-terrain vehicle, including a transmission and a transfer case. A connecting plate is fixedly connected to the rear cover of the transmission housing. An input shaft is supported by a bearing in the housing of the transfer case. One end of the input shaft extends out of the housing and passes through the connecting plate into the rear cover of the transmission housing. A transfer case input gear is fixedly installed on the shaft section of the input shaft located inside the rear cover of the transmission housing. The transfer case input gear meshes with the output gear of the transmission. A drive gear is fixedly installed on the shaft section of the input shaft located inside the housing of the transfer case. The output end includes a front drive output gear shaft and a rear drive output gear shaft. The centerlines of the front drive output gear shaft and the rear drive output gear shaft are located on the same straight line and are supported on the housing of the transfer case by bearings. The opposing ends of the front drive output gear shaft and the rear drive output gear shaft are slidably engaged by bearings. The rear drive output gear shaft is provided with a driven gear and a engagement gear. The driving gear is connected to the driven gear through a pulley provided on the intermediate shaft. The front drive output gear shaft has a spline engagement gear sleeve. The engagement gear sleeve is actuated by the front drive shift fork and is used to engage or disengage with the engagement gear on the rear drive output gear shaft.

[0006] Preferably, one end of the front drive output gear shaft is supported on the transfer case by a bearing, and the other end is supported on the front output flange; one end of the rear drive output gear shaft is supported on the transfer case by a bearing, and the other end is supported on the rear output flange.

[0007] Preferably, the through-wheel spline is fitted onto the intermediate shaft.

[0008] Preferably, the drive gear is splined on the input shaft.

[0009] Preferably, one end of the input shaft is supported in the transmission by a bearing, and the other end is supported in the transfer case by a bearing.

[0010] Preferably, the rear cover of the transmission housing is fixedly connected to the connecting plate by bolts, and the housing of the transfer case is fixedly connected to the connecting plate by bolts.

[0011] Preferably, the rear drive output gear shaft, driven gear, and engagement gear are integrally formed.

[0012] The advantages of this utility model are as follows: By inserting the transfer case input shaft into the transmission and directly connecting it to the output gear of the transmission, the installation distance is shortened and the structure is compact, enabling all-terrain vehicles that cannot install an independent transfer case to achieve four-wheel drive. Furthermore, the reducer and transfer case of this utility model are both fixed to the connecting plate with bolts, which facilitates the maintenance of the reducer or transfer case.

[0013] All-terrain vehicles (ATVs): ATVs are vehicles that can travel on any terrain, moving freely on terrains where ordinary vehicles cannot maneuver. In China, they are commonly known as beach buggies. Because their structure is very similar to motorcycles, and many parts are interchangeable, they are also sometimes called "four-wheeled motorcycles." This type of vehicle has multiple uses and is not limited by road conditions. It is widely used in North America and Western Europe, and its use is increasing year by year. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0016] Figure 3 This is a partial cross-sectional view of the present invention. Detailed Implementation

[0017] See Figures 1 to 3A transfer case structure for an all-terrain vehicle transmission includes a transmission 1 and a transfer case 2. The rear cover 12 of the transmission 1 is fixedly connected to a connecting plate 3 by bolts. The housing 22 of the transfer case 2 is also fixedly connected to the connecting plate 3 by bolts. Connecting the transmission 1 and the transfer case 2 to the connecting plate 3 by bolts facilitates installation and disassembly when the transmission 1 or transfer case 2 requires maintenance. The housing 22 of the transfer case 2 supports an input shaft 21 via bearings. One end of the input shaft 21 extends out of the housing 22 and passes through the connecting plate 3, inserting into the rear cover 12 of the transmission 1. This shortens the installation distance, resulting in a compact structure and reduced installation space. A transfer case input gear 212 is fixedly mounted on the shaft section of the input shaft 11 located inside the rear cover 12 of the transmission 1. The transfer case input gear 212 meshes with the output gear 11 of the transmission 1. A drive gear 211 is splined on the shaft section of the input shaft 21 located inside the housing 22 of the transfer case 2. The output end of the transfer case 2 includes a front drive output gear shaft 4 and a rear drive output gear shaft 5. The center lines of the front drive output gear shaft 4 and the rear drive output gear shaft 5 are located on the same straight line. The purpose of this arrangement is to make the structure more compact and reduce space occupation. One end of the front drive output gear shaft 4 is supported by a bearing within the housing 22 of the transfer case 2, and the other end is supported by the front output flange 101. It connects to the front axle via the front output flange 101, transmitting power to the front drive. One end of the rear drive output gear shaft 5 is supported by a bearing within the housing 22 of the transfer case 2, and the other end is supported by the rear output flange 102. It connects to the rear axle via the rear output flange 102, transmitting power to the rear drive. The opposing ends of the front drive output gear shaft 4 and the rear drive output gear shaft 5 are slidably fitted by bearings 8. The rear drive output gear shaft 5 is provided with a driven gear 51 and a engagement gear 52. The rear drive output gear shaft 5, driven gear 51, and engagement gear 52 are integrally formed. The driving gear 211 is connected to the driven gear 51 via a splined guide wheel 91 on the intermediate shaft 9. The front drive output gear shaft 4 has a splined engagement sleeve 6, which is actuated by the front drive shift fork 71 to engage or disengage with the engagement gear 52 on the rear drive output gear shaft 5.

[0018] When the rear-drive system of this utility model is used: the output gear 11 of the transmission 1 transmits power to the input shaft 21 of the transfer case 2 through the input gear 212 of the transfer case. Then, through the drive gear 211 on the input shaft 21, the power is transmitted to the driven gear 51 meshing with it via the wheel 91, thereby driving the rear-drive output gear shaft 5 to rotate and output power to the rear output flange 102. The rear output flange 102 and the rear axle are connected by a drive shaft to realize the rear axle drive of the vehicle.

[0019] When using the four-wheel drive system of this utility model: pulling the shift fork shaft 7 causes the front drive shift fork 71 to slide, so that the engagement sleeve 6 engages with the engagement teeth 52 on the rear drive output gear shaft 5. The output gear 11 of the transmission 1 transmits power to the input shaft 21 of the transfer case 2 through the input gear 212 of the transfer case. Then, through the drive gear 211 on the input shaft 21, the power is transmitted to the driven gear 51 that meshes with it through the wheel 91, thereby driving the rear drive output gear shaft 5 and the front drive output gear shaft 4 to rotate, and outputting power to the rear output flange 102 and the front output flange 101 respectively. The front and rear axles are connected by the drive shaft respectively, so that the front and rear axles of the vehicle can be driven simultaneously.

[0020] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications made to the present utility model by those skilled in the art without departing from the spirit of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A transmission transfer mechanism for an all-terrain vehicle, comprising a transmission (1) and a transfer case (2), characterized in that: A connecting plate (3) is fixedly connected to the rear cover (12) of the transmission (1). The housing (22) of the transfer case (2) supports an input shaft (21) via a bearing. One end of the input shaft (21) extends out of the housing (22) and passes through the connecting plate (3) into the rear cover (12) of the transmission (1). A transfer case input gear (212) is fixedly installed on the shaft section of the input shaft (21) located inside the rear cover (12) of the transmission (1). The transfer case input gear (212) meshes with the output gear (11) of the transmission (1). A drive gear (211) is fixedly installed on the shaft section of the input shaft (21) located inside the housing (22) of the transfer case (2). The output end of the transfer case (2) includes a front drive output gear shaft ( 4) Rear drive output gear shaft (5), the center lines of the front drive output gear shaft (4) and the rear drive output gear shaft (5) are on the same straight line, and are respectively supported by bearings on the housing (22) of the transfer case (2). The opposing ends of the front drive output gear shaft (4) and the rear drive output gear shaft (5) are slidably engaged by bearings (8). The rear drive output gear shaft (5) is provided with a driven gear (51) and a engagement gear (52). The driving gear (211) is connected to the driven gear (51) through a pulley (91) provided on the intermediate shaft (9). The front drive output gear shaft (4) is splined to engage a gear sleeve (6). The engagement gear sleeve (6) is actuated by the front drive shift fork (71) and is used to engage or disengage with the engagement gear (52) on the rear drive output gear shaft (5).

2. The transmission transfer structure for an all-terrain vehicle according to claim 1, characterized in that: The front drive output gear shaft (4) is supported at one end by a bearing on the transfer case (2) and at the other end by the front output flange (101). The rear drive output gear shaft (5) is supported at one end by a bearing on the transfer case (2) and at the other end by the rear output flange (102).

3. The transmission transfer structure for an all-terrain vehicle according to claim 1, characterized in that: The intermediate shaft (91) is splined on the intermediate shaft (9).

4. The transmission transfer structure of an all-terrain vehicle according to claim 1, characterized in that: The drive gear (211) is splined on the input shaft (21).

5. The transmission transfer structure for an all-terrain vehicle according to claim 1, characterized in that: One end of the input shaft (21) is supported in the transmission (1) by a bearing, and the other end is supported in the transfer case (2) by a bearing.

6. The transmission transfer structure for an all-terrain vehicle according to claim 1, characterized in that: The rear cover (12) of the gearbox (1) is fixedly connected to the connecting plate (3) by bolts, and the housing (22) of the transfer case (2) is fixedly connected to the connecting plate (3) by bolts.

7. The transmission transfer structure of an all-terrain vehicle according to claim 1, characterized in that: The rear drive output gear shaft (5), driven gear (51), and engagement gear (52) are integrally formed.

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