Rear engine speed change mechanism

Abstract

The utility model relates to the field of engines, and particularly discloses a rear engine speed change mechanism which comprises a gear shifting mechanism, an engine shell, a differential mechanism body and a differential mechanism shell, the gear shifting mechanism comprises an output shaft and an output gear coaxially fixed on the output shaft, and the differential mechanism body comprises a power input gear ring meshed with the output gear; the end face of the differential shell is partially connected with the end face of the engine shell, and the differential body is located between the differential shell and the engine shell. According to the scheme, the engine shell and the differential mechanism shell can be installed in a matched mode, the differential mechanism body can be integrally installed between the differential mechanism shell and the engine shell, the structural arrangement of the gear shifting mechanism, the engine shell, the differential mechanism body and the differential mechanism shell is more compact, and the gear shifting mechanism can be more easily arranged and installed between rear wheels of the motor tricycle.

Description

Technical Field

[0001] The utility model relates to the technical field of engines, in particular to a rear-mounted engine speed change mechanism. Background Art

[0002] The power transmission between the engine and wheels of a three-wheeled motorcycle can be classified into three main types: chain drive, belt drive, and shaft drive. The shaft drive system is currently the core technical development direction of three-wheeled motorcycles. It connects the engine and rear wheel to achieve power transmission, and it has extremely low maintenance requirements and operates smoothly and quietly.

[0003] The rear-mounted engine is used in a shaft drive system. In a rear-mounted engine, the connection methods of the transmission and the differential are divided into direct connection and indirect connection. The rear-mounted engine mostly adopts indirect connection, and the power of the transmission is transmitted to the differential through a series of intermediate transmission components (such as universal joint drive shaft, chain, etc.). However, the intermediate transmission components will have a certain energy loss when transmitting power, which will lead to a decrease in power transmission efficiency; at the same time, the structure of the intermediate transmission components is more complicated, which increases the difficulty of repair and maintenance, and also requires a larger space to arrange the intermediate transmission components, resulting in a relatively cramped space layout when it is applied to three-wheeled motorcycles, which will also lead to an increase in the cost of using structural components. Utility Model Content

[0004] In response to the shortcomings of the existing technology, the utility model provides a rear-mounted engine speed change mechanism to solve the problem that when an intermediate transmission component is used to connect the transmission and the differential, a larger space is required to arrange the intermediate transmission component, resulting in a relatively cramped space layout when it is applied to a three-wheeled motorcycle.

[0005] To achieve the above-mentioned object, the basic scheme of the present invention is as follows: a rear-mounted engine transmission mechanism, comprising a shift mechanism, an engine housing, a differential body and a differential housing, the shift mechanism comprising an output shaft and an output gear coaxially fixed to the output shaft, the differential body comprising a power input ring gear meshing with the output gear;

[0006] The end surface of the differential housing is connected to a part of the end surface of the engine housing, and the differential body is located between the differential housing and the engine housing.

[0007] The technical principle of the present invention is as follows: through the cooperation between the output gear on the output shaft and the power input ring gear on the differential body, when the shift mechanism shifts gears and transmits power, the power on the output gear can be directly transmitted to the power input ring gear, and then transmitted to the differential body. The differential body can directly transmit power to the rear wheels of the three-wheeled motorcycle, thereby improving the transmission efficiency of kinetic energy and reducing the cost of using intermediate structural components; at the same time, the engine housing can be installed in cooperation with the differential housing, and the differential body can be integrated and installed between the differential housing and the engine housing, so that the structural arrangement between the shift mechanism, the engine housing, the differential body and the differential housing is also more compact, and it is easier to arrange and install between the rear wheels of the three-wheeled motorcycle.

[0008] Furthermore, the differential body also includes a planetary gear system connected to the power input ring gear and two half-shaft gear systems, one of which is connected to one end of the planetary gear system through meshing power and outputs power after passing through the differential case, and the other half-shaft gear system is connected to the other end of the planetary gear system through meshing power and outputs power after passing through the engine case.

[0009] Through the above arrangement, the power input ring gear can transmit power to the planetary gear system, and the planetary gear system distributes and transmits the power to the two half-shaft gear systems. The half-shaft gear system on one side transmits power to the rear wheel on one side of the three-wheeled motorcycle, and the half-shaft gear system on the other side transmits power to the rear wheel on the other side of the three-wheeled motorcycle, thereby realizing stable transmission of power. During the transmission process of the half-shaft gear system, the differential housing and the engine housing can respectively provide stable support for the two half-shaft gear systems, making the layout and installation of the differential body more reliable.

[0010] Furthermore, the shift mechanism further comprises:

[0011] An input shaft, wherein an input gear is provided on the input shaft;

[0012] A driving shaft, on which a plurality of driving gears are provided, one of which is meshed with the input gear;

[0013] A driven shaft, on which a plurality of driven gears capable of meshing with the driving gear are provided;

[0014] A shift shaft, one end of which is provided with a shift operating portion, and a middle portion of which is provided with a plurality of shift fork structures for controlling the meshing of the driving gear and the driven gear;

[0015] The output gear on the output shaft can be connected to the driven shaft in a power manner.

[0016] Through the above arrangement, the crankshaft output power in the engine drives the input shaft to rotate, and the input gear on the input shaft meshes with the driving gear on the driving shaft, driving the driving shaft to rotate. At this time, the driver controls the shift fork structure through the shift operating part on the shift shaft to drive the driving gear on the driving shaft to mesh with the driven gear on the driven shaft, thereby realizing gear shifting and power transmission. The driven shaft transmits power to the output gear on the output shaft, and the output gear drives the output shaft to rotate. The output shaft transmits power to the differential body. The left end of the differential body transmits power to the left wheel on the rear side of the three-wheeled motorcycle, and the right end of the differential body transmits power to the right wheel on the rear side of the three-wheeled motorcycle. In this process, the power of the engine is accurately and completely transmitted to the rear wheel of the three-wheeled motorcycle.

[0017] Furthermore, the arrangement axes of the half-shaft gear trains are all parallel to the axes of the input shaft, the driving shaft, the driven shaft, the shift shaft and the output shaft.

[0018] Through the above arrangement, the input shaft, driving shaft, driven shaft, shift shaft and output shaft can stably transmit power through each gear.

[0019] Furthermore, one end of the input shaft, driving shaft, driven shaft, shift shaft and output shaft are connected to the inner wall of the engine housing, and the other end of the input shaft, driving shaft, driven shaft, shift shaft and output shaft are connected to the inner wall of the differential housing.

[0020] Through the above arrangement, it is convenient to accurately arrange the input shaft, driving shaft, driven shaft, shift shaft, output shaft, power input ring gear, planetary gear system and two half-shaft gear system structures between the differential housing and the left case, making the power transmission smoother and more stable, and also facilitating the installation and matching of the end faces of the differential housing and the engine housing.

[0021] Furthermore, the output shaft and the differential body are located on the lower side of the input shaft, the driving shaft, the driven shaft and the shift shaft.

[0022] Through the above arrangement, when the input shaft, driving shaft, driven shaft, shift shaft, output shaft, power input ring gear, planetary gear system and two half-shaft gear systems are in operation for power transmission, the input shaft, driving shaft, driven shaft and shift shaft can perform gear shifting and speed adjustment on the upper side of the output shaft, power input ring gear, planetary gear system and two half-shaft gear systems, so that the gear shifting and differential adjustment will not interfere with each other.

[0023] Furthermore, the engine housing includes an outer cover, a left case body, a right case body and a right case cover. The outer cover is fixedly and sealedly connected to the left end face of the left case body, the right side part of the left case body is fixedly and sealedly connected to the left end face of the right case body, and the right side part of the left case body is fixedly and sealedly connected to the left end face of the differential housing; the right side end face of the right case body is fixedly and sealedly connected to the left end face of the right case cover.

[0024] Through the above arrangement, the left case, as the main body of the engine housing, can be stably connected to the outer cover, the right case and the differential housing in sequence, and can provide stable support and precise sealing for the installation of the shift mechanism and the differential body. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic structural diagram of the shaft side direction of a rear engine speed change mechanism in an embodiment of the present utility model.

[0026] Figure 2 This is an exploded view of the structure of a rear-mounted engine transmission mechanism in the axial direction in an embodiment of the present utility model.

[0027] In the above drawings: engine housing 1, outer cover 11, left case body 12, right case body 13, right case cover 14, input shaft 21, input gear 22, driving shaft 23, driving gear 24, driven shaft 25, driven gear 26, shift shaft 27, shift operating part 28, shift fork structure 29, output shaft 30, output gear 31, differential case 4, differential body 5, power input ring gear 51, planetary gear train 52, and half-shaft gear train 53. DETAILED DESCRIPTION

[0028] The technical solution of the present invention is further described below with reference to the accompanying drawings and embodiments.

[0029] This embodiment is basically as Figure 1 and Figure 2 As shown, the embodiment of the present invention proposes a rear engine speed change mechanism, including a shift mechanism, an engine housing 1, a differential body 5 and a differential housing 4, as shown in FIG. Figure 2 As shown, the engine housing 1 includes an outer cover 11, a left case 12, a right case 13 and a right case cover 14. The outer cover 11 and the left end face of the left case 12 are fixedly sealed by bolts and a sealing strip. The right side of the left case 12 and the left end face of the right case 13 are fixedly sealed by bolts and a sealing strip. The right side of the left case 12 and the left end face of the differential case 4 are fixedly sealed by bolts and a sealing strip. The differential body 5 is located between the differential case 4 and the engine housing 1; the right side end face of the right case 13 and the left end face of the right case cover 14 are fixedly sealed by bolts and a sealing strip.

[0030] At the same time, if Figure 2As shown, the shift mechanism includes an input shaft 21, a driving shaft 23, a driven shaft 25, a shift shaft 27 and an output shaft 30. An input gear 22 is coaxially fixed on the input shaft 21, and a plurality of driving gears 24 are coaxially fixed on the driving shaft 23, one of which is engaged with the input gear 22; a plurality of driven gears 26 that can be engaged with the driving gear 24 are coaxially fixed on the driven shaft 25, a shift operating portion 28 is provided on the right end of the shift shaft 27, and two shift fork structures 29 for controlling the engagement of the driving gear 24 with the driven gear 26 are provided in the middle of the shift shaft 27. The output gear 31 on the output shaft 30 is engaged with one of the driving gears 24 on the driving shaft 23.

[0031] like Figure 2 As shown, the differential body 5 includes a power input ring gear 51 meshing with the output gear 31, a planetary gear system 52 connected to the power input ring gear 51, and two half-shaft gear systems 53; the right half-shaft gear system 53 is connected to the right side of the planetary gear system 52 through meshing power and outputs power after passing through the differential case 4, and the left half-shaft gear system 53 is connected to the left side of the planetary gear system 52 through meshing power and outputs power after passing through the lower part of the left case 12.

[0032] At the same time, if Figure 2 As shown, the setting axes of the half-shaft gear system 53 are parallel to the axes of the input shaft 21, the driving shaft 23, the driven shaft 25, the shift shaft 27 and the output shaft 30. The left ends of the input shaft 21, the driving shaft 23, the driven shaft 25, the shift shaft 27 and the output shaft 30 are connected to the inner wall of the engine housing 1, and the right ends of the input shaft 21, the driving shaft 23, the driven shaft 25, the shift shaft 27 and the output shaft 30 are connected to the inner wall of the differential housing 4, and the output shaft 30 and the differential body 5 are located on the lower side of the input shaft 21, the driving shaft 23, the driven shaft 25 and the shift shaft 27.

[0033] When the rear-mounted engine transmission mechanism of this embodiment is in use, the crankshaft output power in the engine drives the input shaft 21 to rotate. The input gear 22 on the input shaft 21 meshes with the driving gear 24 on the driving shaft 23, driving the driving shaft 23 to rotate. At this time, the driver controls the shift fork structure 29 through the shift operating part 28 on the shift shaft 27 to drive the driving gear 24 on the driving shaft 23 to mesh with the driven gear 26 on the driven shaft 25, thereby achieving gear shifting and power transmission. The driven shaft 25 transmits power to the output gear 31 of the output shaft 30. The output gear 31 drives the output shaft 30 to rotate. The output shaft 30 transmits power to the power input ring gear 51. The power input ring gear 51 transmits power to the planetary gear train 52. The planetary gear train 52 distributes the power to the two half-shaft gear trains 53. At this time, the left half-shaft gear train 53 transmits power to the left wheel of the three-wheeled motorcycle, and the right half-shaft gear train 53 transmits power to the right wheel of the three-wheeled motorcycle.

[0034] In the above process, after the differential housing 4 is matched with the left case 12, the differential body 5 can be integrated and installed between the differential housing 4 and the left case 12, so that the power transmission between the differential body 5 and the output shaft 30 is more direct, and the power loss between the differential body 5 and the output shaft 30 can also be reduced, so that the power output from both ends of the half-shaft gear system 53 is more direct and powerful, thereby improving the transmission efficiency of kinetic energy and reducing the use cost of intermediate structural components; at the same time, the structural arrangement between the shift mechanism, the engine housing 1, the differential body 5 and the differential housing 4 is also more compact, and it is easier to arrange and install between the rear wheels of the three-wheeled motorcycle.

[0035] When the input shaft 21, the driving shaft 23, the driven shaft 25, the shift shaft 27, the output shaft 30, the power input ring gear 51, the planetary gear system and the two half-shaft gear systems 53 are in operation for power transmission, the input shaft 21, the driving shaft 23, the driven shaft 25 and the shift shaft 27 can perform gear shifting and speed adjustment on the upper side of the output shaft 30, the power input ring gear 51, the planetary gear system and the two half-shaft gear systems 53, so that the gear shifting and differential adjustment will not interfere with each other, and it is also convenient to precisely arrange the input shaft 21, the driving shaft 23, the driven shaft 25, the shift shaft 27, the output shaft 30, the power input ring gear 51, the planetary gear system and the two half-shaft gear systems 53 between the differential case 4 and the left case body 12, so that the power transmission is smoother and more stable.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and are not limiting. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in this 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 rear-mounted engine transmission mechanism, comprising a shift mechanism, an engine housing, a differential body and a differential housing, characterized in that: The shift mechanism includes an output shaft and an output gear coaxially fixed on the output shaft, and the differential body includes a power input ring gear meshing with the output gear; The end surface of the differential housing is connected to a part of the end surface of the engine housing, and the differential body is located between the differential housing and the engine housing.

2. A rear engine transmission mechanism according to claim 1, characterized in that: The differential body also includes a planetary gear system that is power-connected to the power input ring gear and two half-shaft gear systems, wherein one half-shaft gear system is power-connected to one end of the planetary gear system through meshing power and outputs power after passing through the differential case, and the other half-shaft gear system is power-connected to the other end of the planetary gear system through meshing power and outputs power after passing through the engine case.

3. A rear engine transmission mechanism according to claim 2, characterized in that: The shift mechanism further comprises: an input shaft, wherein an input gear is provided on the input shaft; A driving shaft, wherein a plurality of driving gears are provided on the driving shaft, one of which is meshed with the input gear; A driven shaft, wherein the driven shaft is provided with a plurality of driven gears that can mesh with the driving gear; A shift shaft, one end of which is provided with a shift operating portion, and a middle portion of which is provided with a plurality of shift fork structures for controlling the meshing of the driving gear and the driven gear; The output gear on the output shaft can be dynamically connected to the driven shaft.

4. A rear engine transmission mechanism according to claim 3, characterized in that: The arrangement axes of the half-shaft gear trains are all parallel to the axes of the input shaft, the driving shaft, the driven shaft, the shift shaft and the output shaft.

5. A rear engine transmission mechanism according to claim 4, characterized in that: One end of the input shaft, driving shaft, driven shaft, shift shaft and output shaft are connected to the inner wall of the engine housing, and the other end of the input shaft, driving shaft, driven shaft, shift shaft and output shaft are connected to the inner wall of the differential housing.

6. A rear engine transmission mechanism according to claim 4, characterized in that: The output shaft and the differential body are located on the lower side of the input shaft, the driving shaft, the driven shaft and the shift shaft.

7. A rear engine transmission mechanism according to any one of claims 1 to 6, characterized in that: The engine housing includes an outer cover, a left case body, a right case body and a right case cover. The outer cover is fixedly and sealedly connected to the left end face of the left case body, the right side of the left case body is fixedly and sealedly connected to the left end face of the right case body, and the right side of the left case body is fixedly and sealedly connected to the left end face of the differential housing; the right side end face of the right case body is fixedly and sealedly connected to the left end face of the right case cover.

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