Motor tricycle engine capable of outputting power longitudinally and centrally and motor tricycle

Abstract

The utility model discloses a motor tricycle engine capable of outputting power longitudinally and centrally, which comprises an engine body, a power output shaft and a power output shaft, the reversing mechanism is externally arranged outside the main box body and has an advance and retreat gear switching function, the reversing mechanism comprises a reversing output shaft which is longitudinally arranged, and the axis of the reversing output shaft is arranged close to the center of the engine and near the center; the transmission mechanism is used for transmitting the power of the power output shaft to the reversing mechanism; according to the motor tricycle engine, the compact arrangement of the whole tricycle can be facilitated, the overall transmission efficiency and transmission reliability can be improved, meanwhile, the good using economical efficiency, maintainability and universality can be achieved, and the using cost can be reduced; the utility model further discloses a motor tricycle which is provided with the motor tricycle engine capable of outputting power longitudinally and centrally, and the axis of the reversing output shaft is arranged right opposite to the center of a rear axle.

Description

Technical Field

[0001] The utility model relates to the technical field of motorcycle structure design, in particular to a three-wheeled motorcycle engine with longitudinally centered power output and a three-wheeled motorcycle. Background Art

[0002] The traditional three-wheeled motorcycle engine itself usually does not have the forward and reverse gear switching and reversing functions. The secondary shaft of the speed change mechanism is used as the power output shaft. The secondary shaft is arranged horizontally on the vehicle, and the power is output horizontally. When the vehicle is arranged, it is necessary to carry a bevel gear reverse gear on the vehicle to realize the reverse gear function, and at the same time convert the horizontal power output into the longitudinal output, so as to facilitate the connection with the rear axle drive shaft of the vehicle. However, due to the influence of the engine's own structure, the bevel gear reverse gear can usually only be arranged on the side of the engine close to the secondary shaft hole. The output shaft of the bevel gear reverse gear deviates from the center of the engine body, which is not conducive to the equal length design of the rear axle half shaft, reduces the reliability of the longer half shaft, and also affects the handling of the vehicle. In order to align the output shaft of the bevel gear reverse gear with the center of the rear axle, an additional chain / gear transmission mechanism needs to be set, which increases the number of parts, has low compactness, is not conducive to the layout of the vehicle, and has low transmission efficiency and low transmission reliability.

[0003] For this reason, some new three-wheeled motorcycle engines have reverse gear and reversing mechanisms integrated inside. The engine itself can realize reverse gear and power output reversing functions, which improves the compactness of the vehicle layout. When designing the internal structure of the engine, the layout requirements of the vehicle are comprehensively considered to ensure that the position of the power output shaft can be aligned with the center of the rear axle. However, once the design of this built-in reversing mechanism is finalized, the position of the power output shaft relative to the engine body will no longer be adjustable. The engine can only match a specific vehicle chassis, and its versatility is low. Once the vehicle chassis changes, the power output shaft can only be aligned with the center of the rear axle by adjusting the overall installation position of the engine, or by redesigning and adjusting the internal structure size of the engine to change the position of the power output shaft. The cost of modification is high and the cycle is long. At the same time, since the engine case is also equipped with components such as a transmission mechanism and a clutch, this built-in structure increases the complexity of the internal structure of the engine case, making it difficult to design and manufacture. Moreover, the integration of all functional mechanisms in one case can easily lead to maintenance difficulties, especially the reversing mechanism, which often requires the use of a relatively easily damaged bevel gear transmission structure. If it is damaged and needs repair, the engine needs to be disassembled as a whole, which results in high maintenance costs. Moreover, if the reversing mechanism is damaged, it may also cause damage to other components such as the main and secondary shafts, which will also increase maintenance costs. Moreover, compared with traditional three-wheeled motorcycle engines, the engine case volume varies greatly, which is not conducive to the replacement of engines of existing models. After replacement, the suspension position generally needs to be redesigned, and the frame suspension must also be changed accordingly, resulting in low economy and versatility.

[0004] Therefore, there is an urgent need to provide a new engine that can facilitate the compact layout of the entire vehicle, can help improve the overall transmission efficiency and transmission reliability, can help the entire vehicle have better controllability, and at the same time can have better economy and maintainability in use, and can help reduce the cost of use. Utility Model Content

[0005] In view of this, the purpose of the utility model is to provide a three-wheeled motorcycle engine with longitudinally centered power output, which can facilitate the compact layout of the entire vehicle, can help improve the overall transmission efficiency and transmission reliability, can help the entire vehicle have better controllability, and at the same time can have better economy of use and maintainability, and can help reduce the cost of use.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a three-wheeled motorcycle engine with longitudinally centered power output, comprising: an engine body, including a main housing and a power output shaft arranged on the main housing; a reversing mechanism with a forward and reverse gear switching function externally mounted on the outside of the main housing, the reversing mechanism comprising a longitudinally arranged reversing output shaft, and the axis of the reversing output shaft is arranged near the center of the engine and the center; a transmission mechanism, used to transmit the power of the power output shaft to the reversing mechanism.

[0007] Furthermore, the reversing mechanism also includes an outer box body fixedly mounted on the outside of the main box body, a reversing input shaft arranged in the outer box body, and a forward and reverse gear reversing transmission assembly arranged in the outer box body for realizing forward and reverse gear switching and reversing between the reversing input shaft and the reversing output shaft; the transmission mechanism is arranged in the main box body, the input end of the transmission mechanism is connected to the power output shaft, and the output end of the transmission mechanism is connected to the reversing input shaft.

[0008] Furthermore, the main case includes a left crankcase and a transmission case cover covered on the left part of the left crankcase, a transmission mechanism installation cavity is formed between the transmission case cover and the left crankcase, the output end of the power output shaft extends into the transmission mechanism installation cavity, and the transmission mechanism is arranged in the transmission mechanism installation cavity.

[0009] Furthermore, the transmission mechanism includes a transmission gear set arranged in the transmission mechanism installation cavity and a transmission shaft arranged parallel to the power output shaft, the transmission shaft is connected to the power output shaft through the transmission gear set, and the output end of the transmission shaft is coaxially connected to the reversing input shaft.

[0010] Furthermore, a protrusion is integrally extended backward at the rear portion of the left side of the left crankcase, and the transmission mechanism mounting cavity is at least partially located on the protrusion; a transmission shaft mounting hole is provided on the protrusion, and the transmission shaft is rotatably mounted in the transmission shaft mounting hole; an outer box mounting surface is provided on the side of the protrusion facing away from the transmission mechanism mounting cavity, and the outer box is fixedly mounted on the outer box mounting surface.

[0011] Furthermore, the forward and reverse gear reversing transmission assembly includes a driving bevel gear I that is synchronously rotated and arranged on the reversing input shaft, two driven bevel gears I that are loosely sleeved on the reversing output shaft and are constantly meshed with the driving bevel gear I, and a clutch sleeve I that is synchronously rotated and arranged on the reversing output shaft. The clutch sleeve I can be driven to slide and respectively engage with the two driven bevel gears I to form a relative fixation.

[0012] Furthermore, the forward and reverse gear reversing transmission assembly also includes a fork mechanism I for driving the clutch sleeve I to slide, and the fork mechanism I includes a first operating arm arranged horizontally on the top of the outer box body and a fork I arranged at the end of the first operating arm; a fork groove I is provided in the middle of the clutch sleeve I, and the fork I is clamped in the fork groove I; the fork mechanism I also includes a connecting rod mechanism connected to the first operating arm for driving the first operating arm to rotate, and the connecting rod mechanism includes an operating arm bracket fixed to the main box body, a second operating arm rotatably mounted on the operating arm bracket, and a three-link mechanism correspondingly connected to the end of the second operating arm and the head end of the first operating arm.

[0013] Furthermore, the forward and reverse gear reversing transmission assembly includes two active bevel gears II that are loosely sleeved on the reversing input shaft, a driven bevel gear II that is synchronously rotated and arranged on the reversing output shaft and is constantly meshed with the two active bevel gears II, and a clutch sleeve II that is synchronously rotated and arranged on the reversing input shaft. The clutch sleeve II can be driven to slide and respectively engage with the two active bevel gears II to form a relative fixation.

[0014] Furthermore, the forward and reverse gear reversing transmission assembly also includes a fork mechanism II for driving the clutch sleeve II to slide, and a fork groove II is provided in the middle of the clutch sleeve II; the fork mechanism II includes a fork shaft that can be driven to slide laterally, a fork II fixed on the fork shaft and an operating arm assembly for driving the fork shaft to slide laterally; the fork II is clamped in the fork groove II; the operating arm assembly includes an operating shaft that is horizontally and rotatably installed on the top of the outer box body, a first bevel gear coaxially fixed to the operating shaft and a second bevel gear meshing with the first bevel gear, the second bevel gear is coaxially provided with a shift block, the fork shaft is provided with a shift block groove, and the shift block is clamped in the shift block groove.

[0015] The utility model also provides a three-wheeled motorcycle equipped with the three-wheeled motorcycle engine with longitudinally centered power output as described above, and the axis of the reversing output shaft is arranged directly opposite to the center of the rear axle.

[0016] The utility model also has the following beneficial effects: the three-wheeled motorcycle engine can facilitate the compact arrangement of the whole vehicle, can facilitate improving the overall transmission efficiency and transmission reliability, can facilitate the whole vehicle to have better maneuverability, and can also have better use economy, maintainability and versatility, and can facilitate reducing the use cost;

[0017] Specifically, compared with the traditional three-wheeled motorcycle engine with an external reverse gear: the three-wheeled motorcycle engine provided by the utility model has a forward and reverse gear switching function and a power output reversing function, which is conducive to ensuring the compactness of the engine vehicle layout and the layout of the whole vehicle. The reversing output shaft is arranged in the middle longitudinally, which is conducive to aligning with the center of the rear axle of the three-wheeled motorcycle, so as to be directly connected to the rear axle transmission shaft, without the need to arrange a separate reverse gear and chain / gear transmission mechanism and other components, which can help improve the overall transmission efficiency and transmission reliability; at the same time, the central arrangement of the reversing output shaft is conducive to the equal length design of the rear axle half shaft of the whole vehicle, so as to ensure that the whole vehicle has good controllability;

[0018] Compared with the existing three-wheeled motorcycle engines with both the reversing mechanism and the reverse gear mechanism built-in: the three-wheeled motorcycle engine provided by the utility model has good versatility in use. During the development and design or modification design of the whole vehicle, the size or installation position of the external reversing mechanism can be adjusted to meet the adjustment of the lateral position of the reversing output shaft of the whole vehicle, thereby achieving alignment with the center of the rear axle. There is no need to adjust the installation position of the entire engine on the whole vehicle or to redevelop and design a new engine, which can help reduce the design change cost and use cost when the chassis is changed. At the same time, the three-wheeled motorcycle engine has good maintainability and the reversing mechanism can be adjusted separately. The mechanism can be disassembled, assembled, repaired and maintained, which is conducive to maintenance; at the same time, the external reversing mechanism reduces the complexity of the internal structure of the main box, and will not cause collateral damage to the auxiliary shaft, main shaft and other parts, which has good economic efficiency and is conducive to reducing the cost of use and maintenance; at the same time, compared with the traditional engine without reverse gear reversing function, the volume of the engine box changes less (the volume of the existing structure box with fully built-in shifting and reversing mechanisms changes greatly), which is particularly suitable for the modification design on the traditional frame, and the traditional engine can be directly replaced with the engine in this application without changing the suspension position, and the economy and versatility of use are good;

[0019] The three-wheeled motorcycle provided by the utility model has good maneuverability, is conducive to realizing equal length setting of the rear axle half shafts, and has good maintainability and economical use. When the reversing mechanism is damaged, there is no need to dismantle the engine, and only the reversing mechanism needs to be repaired.

[0020] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and will be apparent to those skilled in the art based on the following examination and research, or can be taught from the practice of the present invention to some extent. The objectives and other advantages of the present invention can be achieved and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the cross section of the utility model Figure 1

[0022] Figure 2 This is a schematic diagram of the shaft side structure of the utility model

[0023] Figure 3 The left crankcase shaft side structure diagram Figure 1

[0024] Figure 4 The left crankcase shaft side structure diagram Figure 2

[0025] Figure 5 Schematic diagram of the shaft side structure for the installation of the reverse gear reversing mechanism and the left crankcase cover

[0026] Figure 6 Schematic diagram of the shaft side structure of the fork mechanism Ⅰ and the clutch sleeve Ⅰ

[0027] Figure 7 Schematic diagram of the cross-section structure of the forward and reverse gear commutator

[0028] Figure 8 A cross-sectional schematic diagram of another embodiment of the utility model

[0029] Fig. 9 This is a schematic diagram of the shaft side structure of another embodiment of the utility model after removing the main box body

[0030] Fig.10 This is a schematic diagram of the shaft side structure of the fork mechanism II and the clutch sleeve II of another embodiment of the utility model

[0031] Figure numerals: 1-main housing; 101-left crankcase; 101a-protrusion; 101a-1-transmission shaft mounting hole; 101a-2-auxiliary housing mounting surface; 102-left crankcase cover; 102a-transmission mechanism mounting cavity; 2-power output shaft; 3-transmission mechanism; 301-transmission shaft; 302-transmission gear set; 302a-driving gear; 302b-driven gear; 302c-bridge gear; 4-forward and reverse gear reversing device; 401-outer housing; 401a-connecting seat; 401b-housing; 401c-rear bearing cover; 402-reversing input shaft; 403-reversing output shaft; 404-forward and reverse gear reversing transmission assembly; 404a- Driving bevel gear Ⅰ; 404b-driven bevel gear Ⅰ; 404c-clutch sleeve Ⅰ; 404c-1-shift fork groove Ⅰ; 404A-driving bevel gear Ⅱ; 404B-driven bevel gear Ⅱ; 404C-clutch sleeve Ⅱ; 404C-1-shift fork groove Ⅱ; 405-shift fork mechanism Ⅰ; 405a-first operating arm; 405b-shift fork Ⅰ; 405c-operating arm bracket; 405d-second operating arm; 405e-three-link mechanism; 406-shift fork mechanism Ⅱ; 406A-shift fork shaft; 406A-1-shift block groove; 406-shift fork Ⅱ; 406C-operating shaft; 406D-first bevel gear; 406E-second bevel gear; 405E-1-shift block. DETAILED DESCRIPTION

[0032] The following describes the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only used to illustrate the basic concept of the present invention, and the following embodiments and the features in the embodiments can be combined with each other without conflict.

[0033] It should be noted that, unless otherwise specified, the directional terms such as "rear end", "rear", "left", "right", "top", "rear", "lateral" and "longitudinal" mentioned below are all based on the position of the engine on the vehicle, where the front and rear direction of the vehicle is the longitudinal direction and the left and right direction of the vehicle is the lateral direction.

[0034] See also Figure 1-10The present embodiment discloses a three-wheeled motorcycle engine with longitudinally centered power output, comprising: an engine body, including a main housing 1 and a power output shaft 2 arranged on the main housing 1, wherein the main housing 1 here generally refers to the crankcase of the three-wheeled motorcycle engine, and the crankcase is generally formed by the left crankcase 101 and the right crankcase being butt-jointed and fixed, and the output shaft 2 is a secondary shaft of a speed change mechanism integrated in the crankcase, and can be designed with reference to the existing structure, which will not be described in detail here; a reversing mechanism 4 with a forward and reverse gear switching function externally mounted on the outside of the main housing 1, wherein the reversing mechanism 4 comprises a longitudinally arranged reversing output shaft 403, and the axis of the reversing output shaft 403 is arranged near the center of the engine and near the center, and “longitudinal” means When the engine is arranged in the whole vehicle, the front and rear direction of the whole vehicle; the reversing output shaft 403 is arranged near the center of the engine and near the center, of course, it also includes being arranged through the center of the engine, that is, being arranged near the middle of the engine, and can be specifically determined according to the position that can be aligned with the center of the rear axle when the whole vehicle is arranged; it should be noted that there are many types of reversing mechanisms 4 that can realize the forward and reverse gear switching function, the most common of which are bevel gear reverse gears, etc., and the structure of the reversing mechanism 4 is not limited here; the transmission mechanism 3 is used to transmit the power of the power output shaft 2 to the reversing mechanism 4, and the transmission mechanism 3 is preferably a gear transmission mechanism, which can be integrated in the reversing mechanism 4 or in the main box body. The spatial arrangement of the reversing mechanism 4 is facilitated by setting the transmission mechanism 3;

[0035] The engine provided above is compared with the traditional three-wheeled motorcycle engine with an external reverse gear: the three-wheeled motorcycle engine has its own forward and reverse gear switching function and power output reversing function, which is conducive to ensuring the compactness of the engine vehicle layout and the layout of the whole vehicle. The reversing output shaft 403 is arranged in the middle longitudinally, which is conducive to alignment with the center of the rear axle of the three-wheeled motorcycle, so that it is directly connected to the rear axle drive shaft, and there is no need to arrange separate reverse gears and chain / gear transmission mechanisms and other components, which can help improve the overall transmission efficiency and transmission reliability; at the same time, the central arrangement of the reversing output shaft is conducive to the equal length design of the rear axle half shafts of the whole vehicle, so as to ensure that the whole vehicle has good maneuverability; compared with the existing three-wheeled motorcycle engine with both the reversing mechanism and the reverse gear mechanism built-in: the three-wheeled motorcycle engine provided by the utility model has good versatility. In the process of vehicle development and design or modification design, the size or installation position of the external reversing mechanism 4 can be adjusted to meet the reversing output shaft in the whole vehicle. The lateral position can be adjusted to achieve alignment with the center of the rear axle. There is no need to adjust the installation position of the engine as a whole on the vehicle or to redevelop and design a new engine, which can help reduce the design change cost and use cost when the chassis is changed; at the same time, the three-wheeled motorcycle engine has good maintainability, and the reversing mechanism 4 can be disassembled and repaired separately, which is convenient for maintenance; at the same time, the external reversing mechanism 4 reduces the complexity of the internal structure of the main box, and will not cause collateral damage to the main shaft, secondary shaft and other components in the main box, which has good use economy and helps reduce the use and maintenance cost; at the same time, compared with the traditional engine without reverse gear reversing function, the volume of the engine box changes less (the volume of the existing structure box with fully built-in shifting and reversing mechanisms changes greatly), which is particularly suitable for the modified design on the traditional frame, and the traditional engine can be directly replaced by the engine in this application without changing or adjusting the suspension position, and the use economy and versatility are good.

[0036] In this embodiment, the reversing mechanism 4 also includes an outer box body 401 fixedly mounted on the outside of the main box body 1, a reversing input shaft 402 arranged in the outer box body 401, and a forward and reverse gear reversing transmission assembly 404 arranged in the outer box body 401 for realizing forward and reverse gear switching and reversing between the reversing input shaft 402 and the reversing output shaft 403. Here, the outer box body 401 is preferably fixedly mounted with the main box body 1 by screws, and the outer box body 401 is arranged on the outside of the rear end of the main box body 1; the transmission mechanism 3 is arranged in the main box body 1, and the input end of the transmission mechanism 3 is connected to the power output shaft 2, and the output end of the transmission mechanism 3 is connected to the reversing input shaft 402; the transmission mechanism 3 is preferably a gear transmission mechanism, when However, in other embodiments, it may also be a chain transmission mechanism, etc., and the forward and reverse gear reversing transmission assembly 404 may have a variety of settings, and the internal structure of the reversing mechanism 4 is not limited here; the reversing mechanism 4 has a simple structure, and the reversing mechanism 4 can be repaired and maintained by disassembling and assembling the outer box body 401; by arranging the transmission mechanism 3 in the main box body 1, it is beneficial to meet the spatial layout requirements of the reversing mechanism 4. At the same time, the transmission mechanism 3 is arranged in the main box body 1, which does not affect the internal structure of the reversing mechanism 4, which is beneficial to simplifying the internal structure of the reversing mechanism and facilitating the layout and installation of the reversing mechanism 4. At the same time, the transmission mechanism 3 is arranged in the main box body 1, which can facilitate the use of a lubrication system with the main box body, thereby ensuring the reliability of the transmission mechanism 3.

[0037] In this embodiment, the main case 1 includes a left crankcase 101 and a transmission case cover 102 covering the left part of the left crankcase 101. Specifically, the transmission case cover 102 is preferably fixedly connected to each other by bolts. A transmission mechanism installation cavity 102a is formed between the transmission case cover 102 and the left crankcase 101. The output end of the power output shaft 2 extends into the transmission mechanism installation cavity 102a, and the transmission mechanism 3 is arranged in the transmission mechanism installation cavity 102a. Usually, the power output shaft 2 is arranged in the crankcase formed by the left crankcase 101 and the right crankcase. A transmission case cover 102 is provided on the left portion of the left crankcase 101 to form a relatively independent transmission mechanism installation cavity 102a, and the transmission mechanism 3 is arranged in the transmission mechanism installation cavity 102a, which does not affect the internal structure of the crankcase, and is conducive to simplifying the internal structure design of the crankcase. At the same time, the transmission mechanism 3 can be inspected and repaired separately by removing the transmission case cover 102, thereby further improving the maintainability. At the same time, since the left portion of the left crankcase 101 is generally the output end of the power output shaft 2, the transmission mechanism installation cavity 102a is designed on the left portion of the left crankcase 101, the position design is reasonable, and the structure is compact.

[0038] In this embodiment, the transmission mechanism 3 includes a transmission gear set 302 arranged in the transmission mechanism installation cavity 102a and a transmission shaft 301 arranged in parallel with the power output shaft 2. The transmission shaft 301 is connected to the power output shaft 2 through the transmission gear set 302. The output end of the transmission shaft 301 is coaxially connected to the reversing input shaft 402. Here, the transmission shaft 301 is connected to the reversing input shaft 402 through a spline transmission. Specifically, the transmission gear set 302 can reasonably set the number of transmission gears according to the distance between the transmission shaft 301 and the power output shaft 2. In general, the transmission The gear set 302 includes a driving gear 302a coaxially fixed to the power output shaft 2 and a driven gear 302b coaxially fixed to the transmission shaft 301. The transmission ratio of the driving gear 302a and the driven gear 302b is preferably set to 1:1. Of course, when the distance between the transmission shaft 301 and the power output shaft 2 is large, a bridge gear can be added between the driving gear 302a and the driven gear 302b to ensure the rationality of the overall size layout; the transmission mechanism 3 adopts a parallel axis gear transmission structure, which is easy to arrange and has reliable transmission; it is also conducive to the arrangement of the reversing mechanism 4.

[0039] In this embodiment, the rear portion of the left side of the left crankcase 101 is integrally extended backward to form a protrusion 101a, and the "integrated extension" here means that the protrusion 101a and the left crankcase 101 are an integral structure, and the transmission mechanism mounting cavity 102a is at least partially located on the protrusion 101a. The protrusion 101a of the integral structure has good structural strength and can avoid unnecessary assembly, thereby reducing the risk of oil leakage inside the crankcase and ensuring reliability in use; the protrusion 101a is provided with a transmission shaft mounting hole 101a-1, and the transmission shaft 301 is rotatably mounted in the transmission shaft mounting hole 101a-1. Specifically, the transmission shaft 301 is mounted in the transmission shaft mounting hole 101a-1 through a bearing, and the transmission shaft mounting hole 101a-1 passes through the protrusion 101a, thereby realizing the power output of the output end of the transmission shaft 301 to the outside; in this structural design, by The raised portion 101a designed on the box body 101 is conducive to the arrangement of the transmission shaft 301 and the power transmission of the transmission shaft 301 to the external reversing mechanism 4. The reversing input shaft 402 of the reversing mechanism 4 can be directly connected to the transmission shaft 301; the raised portion 101a is provided with an outer box body mounting surface 101a-2 on the side away from the transmission mechanism mounting cavity 102a, and the outer box body 401 is fixedly mounted on the outer box body mounting surface 101a-2; specifically, the outer box body mounting surface 101a-2 is preferably set as a plane, and mounting holes are designed on the outer box body mounting surface 101a-2, and the outer box body 401 is preferably fixed to the outer box body mounting surface 101a-2 by bolts; this structural design has high compactness, and the designed raised portion 101a provides a mounting position for the outer box body 401, which is conducive to the installation of the reversing mechanism 4, and is conducive to ensuring the sealing of the mounting surface, thereby improving the reliability of use;

[0040] Here, the outer box body 401 includes a connecting seat 401a fixedly installed on the outer box body mounting surface 101a-2 by bolts, a shell body 401b fixed on the connecting seat 401a by bolts, and a rear bearing cover 401c detachably connected to the rear end of the shell body 401b; the reversing input shaft 402 is rotatably installed in the shell body 401b through bearings; the two ends of the reversing output shaft 403 can be rotatably installed on the shell body 401b and the rear bearing cover 401c through corresponding bearings; of course, the structure of the outer box body 401 can be adaptively set according to its internal structure, and the specific structure of the outer box body 401 is not limited here; of course, in order to more conveniently connect with the rear axle drive shaft of the whole vehicle, the reversing output shaft 403 generally extends backward and is exposed outside the outer box body 401.

[0041] In this embodiment, the forward and reverse gear reversing transmission assembly 404 includes a driving bevel gear I404a synchronously rotated on the reversing input shaft 402, two driven bevel gears I404b which are loosely sleeved on the reversing output shaft 403 and are constantly meshed with the driving bevel gear I404a, and a clutch sleeve I404c synchronously rotated on the reversing output shaft 403, wherein the clutch sleeve I404c can be driven to slide and respectively engage with the two driven bevel gears I404b and form a relative fixation, where "relative fixation" means that power can be stably transmitted after combination, and the clutch sleeve I404c is combined with different driven bevel gears I404b to realize the forward and reverse switching of the reversing output shaft, that is, to realize the forward and reverse gear switching function; specifically, the driving bevel gear I404a and the reversing input shaft 402 are an integrated structure, and the clutch sleeve I404 c is installed on the reversing output shaft 403 through spline matching; the clutch sleeve I404c can be provided with coupling teeth at both ends of the clutch sleeve, and the power transmission between it and the driven bevel gear I404b is completed through the coupling teeth. It is a conventional reverse clutch sleeve structure and will not be described in detail here; in this structural design, both the reversing function and the forward and reverse gear switching function can be realized; at the same time, since the forward and reverse gear switching function is realized by moving the clutch sleeve I404c on the reversing output shaft 403, the two driven bevel gears I404b are arranged on the reversing output shaft 403, and the lateral space occupied is small. Under the same usage specifications, the reversing output shaft 403 can be arranged further to the left, which is particularly suitable for use with engines whose engine center is biased to the left, and is conducive to the alignment of the reversing output shaft 403 with the engine center or the reversing output shaft 403 with the rear axle center when the engine vehicle is arranged biased to the right.

[0042] In this embodiment, the forward and reverse gear reversing transmission assembly 404 also includes a fork mechanism I405 for driving the clutch sleeve I404c to slide. The fork mechanism I405 includes a first operating arm 405a arranged horizontally on the top of the outer box 401 and a fork I405b arranged at the end of the first operating arm 405a. It can be understood that the reverse gear operating arm I405a is rotatably installed, and the end away from the operating end is the end; the middle part of the clutch sleeve I404c is provided with a fork groove I404c-1, and the fork groove 404c-1 is usually annular groove, the fork I 405b is clamped in the fork groove I 404c-1; the fork mechanism I 405 also includes a connecting rod mechanism connected to the first operating arm 405a for driving the first operating arm 405a to rotate, the connecting rod mechanism includes an operating arm bracket 405c fixed to the main box 1, a second operating arm 405d rotatably mounted on the operating arm bracket 405c, and a three-link mechanism 405e correspondingly connected to the end of the second operating arm 405d and the head end of the first operating arm 405a, where the end away from the operating end is The end close to the operating end is the head end, and the operating end refers to the end stepped on by the foot; specifically, the operating arm bracket 405c is fixed to the transmission case cover 102 by bolts; the principle of the reverse fork mechanism I405 is as follows: the second operating arm 405d rotates, and the first operating arm 405a is driven to rotate through the three-link mechanism 405e, thereby driving the fork I405b to rotate, and then driving the clutch sleeve 404c to slide, so as to realize the switching of forward and reverse gears; in this structural design, the fork mechanism I405 has a simple structure and is similar to the reverse gear operation method of the traditional engine. The first operating arm 405a is consistent with the conventional transmission mode, and the position of the first operating arm 405a can be moved forward by the connecting rod mechanism without changing the reverse gear operation position, which is conducive to the modification design of the traditional vehicle model; the two driven bevel gears I are arranged on the longitudinal reversing output shaft 403, and the clutch sleeve I moves longitudinally in order to combine the two gears. In order not to change the user's commonly used shifting method, the first operating arm 405a is arranged horizontally, and the horizontally arranged shaft can rotate longitudinally in the same direction as the movement of the clutch sleeve I; the clutch sleeve I can be driven to slide by a simple structure, and the arrangement structure is reasonable.

[0043] In another embodiment, the forward and reverse gear reversing transmission assembly 404 includes two active bevel gears II 404A which are loosely sleeved on the reversing input shaft 402, a driven bevel gear II 404B which is synchronously rotatably arranged on the reversing output shaft 403 and is constantly meshed with the two active bevel gears II 404A, and a clutch sleeve II 404C which is synchronously rotatably arranged on the reversing input shaft 402. The clutch sleeve II 404C can be driven to slide and respectively engage with the two active bevel gears II 404A and form a relative fixation. Here, "relative fixation" means that power can be stably transmitted after combination. After the clutch sleeve II 404C is combined with different active bevel gears II 404A, the forward and reverse switching of the reversing output shaft is realized, that is, the forward and reverse gear switching function is realized. Specifically, here The driven bevel gear Ⅱ404B and the reversing output shaft 403 are an integral structure, and the clutch sleeve Ⅱ404C is installed on the reversing input shaft 402 through spline matching; the clutch sleeve Ⅱ404C can be provided with coupling teeth at both ends of the clutch sleeve, and the power transmission between the clutch sleeve and the active bevel gear Ⅱ404A is completed through the coupling teeth. It is a conventional reverse gear clutch sleeve structure and is not described here in detail; in this structural design, both the reversing function and the forward and reverse gear switching function can be realized; at the same time, since the forward and reverse gear switching function is realized by moving the clutch sleeve Ⅱ404C on the reversing input shaft 402, the two active bevel gears Ⅱ404A are arranged on the reversing input shaft 402, and the longitudinal space occupied is small, which is particularly suitable for three-wheeled motorcycles with a short front and rear wheelbase or a small front and rear layout space.

[0044] In another embodiment, the forward and reverse gear reversing transmission assembly 404 further includes a fork mechanism II 406 for driving the clutch sleeve II 404C to slide, and a fork groove II 404C-1 is provided in the middle of the clutch sleeve II 404C, and the fork groove II 404C-1 is generally an annular groove; the fork mechanism II 406 includes a fork shaft 406A that can be driven to slide laterally, a fork II 406B fixed on the fork shaft 406A, and a manipulation arm assembly for driving the fork shaft 406A to slide laterally; the fork II 406B is clamped in the fork groove II 404C-1; the manipulation arm assembly includes a manipulation shaft 406C that is horizontally and rotatably installed on the top of the outer box body 401, a first bevel gear 406D coaxially fixed to the manipulation shaft 406C and a second bevel gear 406E meshing with the first bevel gear 406D, and the second bevel gear 406E meshing with the first bevel gear 406D. The gear 406E is coaxially provided with a shift block 406E-1, which rotates under the drive of the second bevel gear 406E. The shift fork shaft 406A is provided with a shift block groove 406A-1, and the shift block 406E-1 is engaged in the shift block groove 406A-1; the implementation principle of the shift fork mechanism II406 is as follows: the operating shaft 406C is operated to rotate, thereby driving the first bevel gear 406D to rotate, thereby driving the second bevel gear 406E to rotate, thereby driving the shift block 406E-1 to rotate, thereby driving the lateral sliding of the shift fork shaft 406A and driving the shift fork II406B to move to complete the movement of the clutch sleeve II404C. The shift fork mechanism II406 has reliable transmission. Through this structure, the reverse gear operation mode of this engine is consistent with that of the traditional engine, and the reverse gear operation habit is not changed, which is conducive to the reform design of the traditional vehicle model.

[0045] The present embodiment also discloses a three-wheeled motorcycle equipped with a three-wheeled motorcycle engine with longitudinally centered power output as described above, and the axis of the reversing output shaft 403 is arranged directly opposite the center of the rear axle; the three-wheeled motorcycle has good maneuverability, which is conducive to achieving equal length setting of the rear axle half shafts, and at the same time has good maintainability and economic use. When the reversing mechanism is damaged, there is no need to dismantle the engine, and only the reversing mechanism needs to be repaired.

[0046] 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 three-wheeled motorcycle engine with longitudinally centered power output, characterized in that: include: The engine body comprises a main housing (1) and a power output shaft (2) arranged on the main housing (1); A reversing mechanism (4) with a forward and reverse gear switching function externally mounted on the outside of the main housing (1), the reversing mechanism (4) comprising a longitudinally arranged reversing output shaft (403), wherein the axis of the reversing output shaft (403) is arranged close to or near the center of the engine; The transmission mechanism (3) is used to transmit the power of the power output shaft (2) to the reversing mechanism (4).

2. The three-wheeled motorcycle engine with longitudinally centered power output according to claim 1, characterized in that: The reversing mechanism (4) further comprises an outer housing (401) fixedly mounted on the outside of the main housing (1), a reversing input shaft (402) arranged on the outer housing (401), and a forward and reverse gear reversing transmission assembly (404) arranged in the outer housing (401) for realizing forward and reverse gear switching and reversing between the reversing input shaft (402) and the reversing output shaft (403); the transmission mechanism (3) is arranged on the main housing (1), the input end of the transmission mechanism (3) is connected to the power output shaft (2), and the output end of the transmission mechanism (3) is connected to the reversing input shaft (402).

3. The three-wheeled motorcycle engine with longitudinally centered power output according to claim 2, characterized in that: The main case (1) comprises a left crankcase (101) and a transmission case cover (102) covering the left portion of the left crankcase (101); a transmission mechanism installation cavity (102a) is formed between the transmission case cover (102) and the left crankcase (101); the output end of the power output shaft (2) extends into the transmission mechanism installation cavity (102a); and the transmission mechanism (3) is arranged in the transmission mechanism installation cavity (102a).

4. The three-wheeled motorcycle engine with longitudinally centered power output according to claim 3, characterized in that: The transmission mechanism (3) comprises a transmission gear set (302) arranged in a transmission mechanism installation cavity (102a) and a transmission shaft (301) arranged in parallel with the power output shaft (2); the transmission shaft (301) is connected to the power output shaft (2) via the transmission gear set (302); and the output end of the transmission shaft (301) is coaxially connected to a reversing input shaft (402).

5. The three-wheeled motorcycle engine with longitudinally centered power output according to claim 4, characterized in that: A protrusion (101a) is integrally formed by extending backwards from the rear portion of the left side of the left crankcase (101), and the transmission mechanism installation cavity (102a) is at least partially located on the protrusion (101a); a transmission shaft installation hole (101a-1) is provided on the protrusion (101a), and the transmission shaft (301) is rotatably installed in the transmission shaft installation hole (101a-1); an outer case installation surface (101a-2) is provided on the side of the protrusion (101a) facing away from the transmission mechanism installation cavity (102a), and the outer case (401) is fixedly installed on the outer case installation surface (101a-2).

6. The three-wheeled motorcycle engine with longitudinally centered power output according to claim 2, characterized in that: The forward / reverse gear reversing transmission assembly (404) comprises a driving bevel gear I (404a) synchronously rotatably arranged on the reversing input shaft (402), two driven bevel gears I (404b) loosely sleeved on the reversing output shaft (403) and constantly meshing with the driving bevel gear I (404a), and a clutch sleeve I (404c) synchronously rotatably arranged on the reversing output shaft (403), wherein the clutch sleeve I (404c) can be driven to slide and respectively engage with the two driven bevel gears I (404b) to form a relative fixation.

7. The three-wheeled motorcycle engine with longitudinally centered power output according to claim 6, characterized in that: The forward / reverse gear reversing transmission assembly (404) further comprises a fork mechanism I (405) for driving the clutch sleeve I (404c) to slide, the fork mechanism I (405) comprising a first operating arm (405a) arranged transversely on the top of the outer box (401) and a fork I (405b) arranged at the end of the first operating arm (405a); a fork groove I (404c-1) is provided in the middle of the clutch sleeve I (404c), and the fork I (405b) is clamped in the fork groove I (404c-2). 04c-1); the fork mechanism I (405) further comprises a connecting rod mechanism connected to the first operating arm (405a) for driving the first operating arm (405a) to rotate, the connecting rod mechanism comprising an operating arm bracket (405c) fixed to the main box (1), a second operating arm (405d) rotatably mounted on the operating arm bracket (405c), and a three-link mechanism (405e) correspondingly connected to the end of the second operating arm (405d) and the head end of the first operating arm (405a).

8. The three-wheeled motorcycle engine with longitudinally centered power output according to claim 2, characterized in that: The forward / reverse gear reversing transmission assembly (404) comprises two active bevel gears II (404A) loosely sleeved on the reversing input shaft (402), a driven bevel gear II (404B) synchronously rotatably arranged on the reversing output shaft (403) and constantly meshing with the two active bevel gears II (404A), and a clutch sleeve II (404C) synchronously rotatably arranged on the reversing input shaft (402), wherein the clutch sleeve II (404C) can be driven to slide and respectively engage with the two active bevel gears II (404A) to form a relative fixation.

9. The three-wheeled motorcycle engine with longitudinally centered power output according to claim 8, characterized in that: The forward / reverse gear reversing transmission assembly (404) further comprises a fork mechanism II (406) for driving the clutch sleeve II (404C) to slide, wherein a fork groove II (404C-1) is provided in the middle of the clutch sleeve II (404C); the fork mechanism II (406) comprises a fork shaft (406A) that can be driven to slide laterally, a fork II (406B) fixed on the fork shaft (406A) and a control arm assembly for driving the fork shaft (406A) to slide laterally; the fork II (406B) is clamped in the fork groove II (404 C-1); the operating arm assembly comprises an operating shaft (406C) which is horizontally and rotatably mounted on the top of the outer box (401), a first bevel gear (406D) coaxially fixed to the operating shaft (406C) and a second bevel gear (406E) meshing with the first bevel gear (406D), the second bevel gear (406E) being coaxially provided with a shift block (406E-1), a shift block groove (406A-1) being provided on the shift fork shaft (406A), and the shift block (406E-1) being engaged in the shift block groove (406A-1).

10. A three-wheeled motorcycle, characterized in that: A three-wheeled motorcycle engine with longitudinally centered power output as claimed in any one of claims 1 to 9 is mounted, and the axis of the reversing output shaft (403) is arranged directly opposite the center of the rear axle.

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