阅读说明：本技术 发动机 (Engine ) 是由 刘学刚 刘新 周昊杰 蒋旺 于 2019-12-24 设计创作，主要内容包括：本发明公开了一种发动机,包括曲轴箱体、气缸体、气缸头,一级变速传动机构、二级变速传动机构和举升传动机构。一级变速传动机构和二级变速传动机构之间连接有1对过桥齿；举升传动机构与一级变速传动机构之间连接有举升惰轮；一级变速传动机构包括基本档位；二级变速传动机构包括正常档、加力档和倒车档；本发明通过自带二级变速机构,倒档机构、变速机构,发动机输出端避免通过倒档器来转换,使发动机横置安装在车体上,输出轴直接和连接轴连接,在基本档位基础上,增加加力档,实现了发动机基本档位的最大输出力量可变性,相较于普通发动机拥有更宽的输出力量范围,适用更多的使用环境,减小能量损失,提升燃油利用率。(The invention discloses an engine, which comprises a crankcase body, an air cylinder head, a primary variable-speed transmission mechanism, a secondary variable-speed transmission mechanism and a lifting transmission mechanism. 1 pair of bridging teeth are connected between the first-stage variable transmission mechanism and the second-stage variable transmission mechanism; a lifting idler wheel is connected between the lifting transmission mechanism and the first-stage variable speed transmission mechanism; the primary variable speed transmission mechanism comprises a basic gear; the secondary speed-changing transmission mechanism comprises a normal gear, a boosting gear and a reverse gear; the invention has the advantages that the two-stage speed change mechanism, the reverse gear mechanism and the speed change mechanism are arranged, the output end of the engine is prevented from being converted by the reverse gear device, the engine is transversely arranged on the vehicle body, the output shaft is directly connected with the connecting shaft, the boosting gear is added on the basis of the basic gear, the maximum output force variability of the basic gear of the engine is realized, the range of the output force is wider compared with that of a common engine, more use environments are suitable, the energy loss is reduced, and the fuel utilization rate is improved.)

1. An engine, characterized in that: the crankshaft box comprises a crankshaft box body, a cylinder body arranged at the top of one side of the crankshaft box body and a cylinder head arranged on the cylinder body, wherein a primary variable transmission mechanism connected with one end of a crankshaft, a secondary variable transmission mechanism and a lifting transmission mechanism are arranged in the crankshaft box body and correspond to the primary variable transmission mechanism, the secondary variable transmission mechanism is connected with an output shaft, 1 pair of bridging teeth are connected between the primary variable transmission mechanism and the secondary variable transmission mechanism, a lifter connected with the lifting transmission mechanism is arranged on the other side of the crankshaft box body, far away from the cylinder head, and a lifting idler wheel is connected between the lifting transmission mechanism and the primary variable transmission mechanism;

the primary variable-speed transmission mechanism comprises a plurality of basic gears with output speeds from low to high;

the two-stage speed change transmission mechanism comprises 3 gears, wherein the 3 gears comprise a normal gear, a boost gear and a reverse gear;

the cylinder body is characterized in that a cylinder body water channel is annularly arranged at the upper part in the cylinder body, a fully-coated cylinder head water channel is arranged around the combustion chamber in the cylinder head, the top of the cylinder body water channel is communicated with the bottom of the cylinder head water channel, a box body water channel is arranged on the crankcase body, a water channel water outlet pipe communicated with the top of the cylinder head water channel is arranged on the cylinder head, a water pump, a water inlet pipe connected with a water pump inlet, and a water inlet and outlet pipe connected with a water pump outlet are arranged on the crankcase body, the water inlet and outlet pipe is connected with a box body water channel water inlet pipe, the box body water channel water inlet pipe is connected with the box body water channel, a water inlet channel I communicated with the side wall of.

2. The engine of claim 1, wherein: the crankcase body comprises a left crankcase body, a left crankcase cover, a right crankcase body and a right crankcase cover, the space between the periphery of the right crankcase body and the left crankcase body, the space between the periphery of the left crankcase cover and the left crankcase body and the space between the periphery of the right crankcase cover and the periphery of the right crankcase body are fixedly connected through bolts, and a cylinder body fixing seat is arranged at the joint of the top of the right crankcase body and the top of the left crankcase body.

3. The engine of claim 2, wherein: the primary variable-speed transmission mechanism comprises a primary transmission main shaft, a primary transmission auxiliary shaft, a primary gear shifting mechanism and a primary gear shifting shaft extending out of the right crankcase cover, the secondary variable-speed transmission mechanism comprises a secondary transmission main shaft, a secondary transmission auxiliary shaft, a secondary gear shifting mechanism and a secondary gear shifting shaft extending out of the left crankcase cover, the primary intermediate gear is sleeved on the primary transmission auxiliary shaft, the secondary intermediate gear is sleeved on the secondary transmission main shaft, and the output shaft is arranged at the tail end of the secondary transmission auxiliary shaft.

4. An engine as set forth in claim 3 wherein: the secondary transmission main shaft is sequentially provided with a normal gear driving gear, a reverse gear driving gear and a boost gear driving gear, the secondary transmission auxiliary shaft is sequentially provided with a normal gear driven gear meshed with the normal gear driving gear, a reverse gear driven gear and a boost gear driven gear meshed with the boost gear driving gear, the reverse gear driving gear and the reverse gear driven gear are meshed and connected through a reverse gear idler gear, the transmission ratio between the normal gear driving gear and the normal gear driven gear is 1:1, and the transmission ratio between the boost gear driving gear and the boost gear driven gear is larger than 1: 1.

5. The engine according to any one of claims 1 to 4, wherein: the lifting transmission mechanism comprises a lifting idler shaft, a lifting shaft and a lifting operation shaft, the lifting idler shaft is arranged in the crankcase body, the lifting operation shaft extends out of the crankcase body, a lifting idler wheel meshed with a driven gear is arranged on the lifting idler shaft, a lifting combination claw and a lifting gear meshed with the lifting idler wheel are arranged on the lifting shaft, the lifting operation shaft is connected with a lifting shifting fork connected with the lifting combination claw, a claw part used for being connected with the lifting combination claw is arranged on the lifting gear, the lifting combination claw is sleeved on the lifting shaft through a spline in a sliding mode, and a lifting connecting sleeve connected with a lifter is arranged at the end part of the lifting shaft.

6. The engine of claim 5, wherein: the lifting connecting sleeve is internally provided with a spline groove connected with a transmission shaft of the lifter, the lifting combining claw and the lifting connecting sleeve are arranged on two sides of the lifting gear, and the lifting shifting fork is sleeved on the lifting idler shaft.

7. The engine of claim 5, wherein: the lifting device is characterized in that a sliding groove is formed in the upper surface of the lifting shifting fork, a pin which is inserted into the sliding groove and used for driving the lifting shifting fork to move in a rotating mode is arranged at the bottom of the lifting operation shaft, and a lifting positioning bolt is connected to the side portion of the lifting operation shaft.

8. An engine as set forth in claim 3 wherein: the water pump is fixedly installed on the right crank case cover, a water channel water inlet connected with the water inlet and outlet pipe is formed in the position, close to the cylinder body, of the top of the left crank case body, and the case body water channel is communicated with the water channel water inlet.

9. The engine of claim 8, wherein: a water inlet channel used for communicating the cylinder head water channel and the cylinder body water channel up and down is arranged between the top of the cylinder body and the bottom of the cylinder head, the water inlet channels are arranged into 4 pairs, and each pair of water inlet channels are uniformly distributed around the cylinder body and the cylinder head.

10. The engine of claim 2, wherein: a balance shaft mechanism is arranged in the right crankcase body and comprises a balance shaft, a balance shaft driven gear arranged on the balance shaft and a balance shaft driving gear arranged on the crankshaft.

Technical Field

The invention belongs to combustion engines; the technical field of engine devices for hot gas or combustion products, in particular to a single-cylinder engine on a two-wheeled motorcycle and a three-wheeled motorcycle.

Background

The existing motorcycle engine only has 5 or 6 gears, each gear has single output force, only can be externally connected with a gearbox to realize a speed change function, and a reverse gear device is added if the reverse gear function is realized, so that two additional accessories not only increase the additional cost, but also increase the additional labor for completion, the assembly is complex, the whole process is time-consuming, labor-consuming and expensive; the above also realizes two functions, if the lifting function is added, the lifting connector connected with the lifting device must be added, which is an extra expense; the accessories added with the three additional functions can also increase the occupied loading space, so that the whole vehicle structure is larger, and the space really provided for users is smaller; moreover, after the engine is subjected to multi-stage conversion through the gearbox and the reverse gear, the output power loss is large, and the power is poor.

The common engine adopts a vertical installation mode, namely, the cylinder head of the engine faces the advancing direction of the engine, the output shaft is vertical to the advancing direction, the transmission of the output shaft and the rear wheel can be realized only by a chain or by additionally arranging a reverse gear and a connecting shaft, after the direction is converted for many times, the output loss of the output shaft and the rear wheel is more or less, and the fuel utilization rate is indirectly reduced.

Disclosure of Invention

In view of the above, the present invention provides an engine, which has a two-stage transmission mechanism, a reverse gear mechanism, a transmission mechanism and a water circulation cooling system, wherein the output end of the engine is prevented from being converted by a reverse gear device, the engine is transversely mounted on a vehicle body, an output shaft is directly connected with a connecting shaft, and the two-stage gear shifting mechanism is used for setting a normal gear, a boost gear and a reverse gear on the basic gear of the engine on the basis of the basic gear; the maximum output force variability of basic gears of the engine is realized, and compared with a common engine, the engine has a wider output force range, is suitable for more use environments, reduces energy loss and improves the fuel utilization rate.

In order to achieve the purpose, the invention provides an engine, which comprises a crankcase body, an air cylinder body arranged at the top of one side of the crankcase body and an air cylinder head arranged on the air cylinder body, wherein a primary variable transmission mechanism connected with one end of a crankshaft, a secondary variable transmission mechanism and a lifting transmission mechanism are arranged in the crankcase body, the secondary variable transmission mechanism and the lifting transmission mechanism are correspondingly arranged with the primary variable transmission mechanism, the secondary variable transmission mechanism is connected with an output shaft, 1 pair of bridging teeth are connected between the primary variable transmission mechanism and the secondary variable transmission mechanism, a lifter connected with the lifting transmission mechanism is arranged at the other side of the crankcase body, far away from the air cylinder head, and a lifting idler wheel is connected between the lifting transmission mechanism and the primary variable transmission mechanism;

the primary variable-speed transmission mechanism comprises a plurality of basic gears with output speeds from low to high;

the two-stage variable speed transmission mechanism comprises 3 gears, wherein the 3 gears comprise a normal gear, a boost gear and a reverse gear;

the cylinder body is characterized in that a cylinder body water channel is annularly arranged at the upper part in the cylinder body, a fully-coated cylinder head water channel is arranged around the combustion chamber in the cylinder head, the top of the cylinder body water channel is communicated with the bottom of the cylinder head water channel, a box body water channel is arranged on the crankcase body, a water channel water outlet pipe communicated with the top of the cylinder head water channel is arranged on the cylinder head, a water pump, a water inlet pipe connected with a water pump inlet, and a water inlet and outlet pipe connected with a water pump outlet are arranged on the crankcase body, the water inlet and outlet pipe is connected with a box body water channel water inlet pipe, the box body water channel water inlet pipe is connected with the box body water channel, a water inlet channel I communicated with the side wall of.

Furthermore, the crankcase body comprises a left crankcase body, a left crankcase cover, a right crankcase body and a right crankcase cover, the right crankcase body and the periphery of the left crankcase body, the left crankcase cover and the periphery of the left crankcase body and the periphery of the right crankcase cover and the periphery of the right crankcase body are fixedly connected through bolts, and a cylinder body fixing seat is arranged at the connecting position of the top of the right crankcase body and the top of the left crankcase body.

Furthermore, the primary variable-speed transmission mechanism comprises a primary transmission main shaft, a primary transmission auxiliary shaft, a primary gear shifting mechanism and a primary gear shifting shaft extending out of the right crankcase cover, the secondary variable-speed transmission mechanism comprises a secondary transmission main shaft, a secondary transmission auxiliary shaft, a secondary gear shifting mechanism and a secondary gear shifting shaft extending out of the left crankcase cover, the primary intermediate gear is sleeved on the primary transmission auxiliary shaft, the secondary intermediate gear is sleeved on the secondary transmission main shaft, and the output shaft is arranged at the tail end of the secondary transmission auxiliary shaft.

Further, a normal gear driving gear, a reverse gear driving gear and a boost gear driving gear are sequentially arranged on the secondary transmission main shaft, a normal gear driven gear meshed with the normal gear driving gear, a reverse gear driven gear meshed with the boost gear driving gear are sequentially arranged on the secondary transmission auxiliary shaft, the reverse gear driving gear and the reverse gear driven gear are meshed through a reverse gear idler gear, the transmission ratio between the normal gear driving gear and the normal gear driven gear is 1:1, and the transmission ratio between the boost gear driving gear and the boost gear driven gear is larger than 1:1

Further, the lifting transmission mechanism comprises a lifting idler shaft, a lifting shaft and a lifting operation shaft, the lifting idler shaft is arranged in the crankcase body, the lifting operation shaft extends out of the crankcase body, a lifting idler wheel meshed with the driven gear is arranged on the lifting idler shaft, a lifting combination claw and a lifting gear meshed with the lifting idler wheel are arranged on the lifting shaft, the lifting operation shaft is connected with a lifting shifting fork connected with the lifting combination claw, a claw part used for being connected with the lifting combination claw is arranged on the lifting gear, the lifting combination claw is sleeved on the lifting shaft through a spline in a sliding mode, and a lifting connecting sleeve connected with a lifter is arranged at the end of the lifting shaft.

Furthermore, a spline groove connected with a transmission shaft of the lifter is arranged in the lifting connecting sleeve, the lifting combining claw and the lifting connecting sleeve are arranged on two sides of the lifting gear, and the lifting shifting fork is sleeved on the lifting idler shaft.

Furthermore, the upper surface of the lifting shifting fork is provided with a sliding groove, the bottom of the lifting operation shaft is provided with a pin which is inserted into the sliding groove and used for rotating to drive the lifting shifting fork to move, and the side part of the lifting operation shaft is connected with a lifting positioning bolt.

Furthermore, the water pump is fixedly installed on the right crank case cover, a water channel water inlet connected with the water inlet and outlet pipe is formed in the position, close to the cylinder body, of the top of the left crank case body, and the case body water channel is communicated with the water channel water inlet.

Furthermore, a water inlet channel for communicating the cylinder head water channel and the cylinder body water channel up and down is arranged between the top of the cylinder body and the bottom of the cylinder head, the water inlet channels are arranged into 4 pairs, and each pair of water inlet channels are uniformly distributed around the cylinder body and the cylinder head.

Further, be provided with balance shaft mechanism in the right crankcase body, balance mechanism includes the balance shaft, sets up balance shaft driven gear and the balance shaft driving gear of setting on the bent axle on the balance shaft.

The invention has the beneficial effects that:

the engine is provided with a secondary speed change mechanism, a reverse gear mechanism, a speed change mechanism and a water circulation cooling system, the output end of the engine is prevented from being converted by a reverse gear device, the engine is transversely arranged on a vehicle body, an output shaft is directly connected with a connecting shaft, and the secondary gear shift mechanism is used for setting a normal gear, a boost gear and a reverse gear on the basic gear of the engine on the basis of the basic gear; the maximum output force variability of basic gears of the engine is realized, and compared with a common engine, the engine has a wider output force range, is suitable for more use environments, reduces energy loss and improves the fuel utilization rate.

Drawings

FIG. 1 is a schematic view of the left side of an engine employing the present invention;

FIG. 2 is a schematic view of the right side of an engine employing the present invention;

FIG. 3 is a schematic diagram of the structure of the transmission mechanism in the engine of the present invention;

FIG. 4 is a schematic structural view of a two-stage transmission mechanism in the engine of the present invention;

FIG. 5 is a schematic diagram of a lift mechanism of the engine of the present invention;

FIG. 6 is a schematic diagram of a recirculating cooling water gallery in an engine according to the present invention;

FIG. 7 is a schematic view of a crankcase in the engine of the present invention;

FIG. 8 is a schematic view of the construction of the right crankcase of the engine of the present invention;

FIG. 9 is a schematic view of the left crankcase of the engine of the present invention.

Detailed Description

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in fig. 1-9, which are schematic structural diagrams of an engine according to the present invention, the engine according to the present invention includes a crankcase, a cylinder block 1 disposed at a top of one side of the crankcase, and a cylinder head 2 disposed on the cylinder block 1, a first-stage speed change transmission mechanism 21 connected to one end of a crankshaft, a second-stage speed change transmission mechanism 22 and a lift transmission mechanism 23 are disposed in the crankcase, the second-stage speed change transmission mechanism 22 is connected to an output shaft 3, 1 pair of bridge teeth are connected between the first-stage speed change transmission mechanism 21 and the second-stage speed change transmission mechanism 22, a lift 14 connected to the lift transmission mechanism 23 is disposed on the other side of the crankcase, away from the cylinder head 2, and a lift idler 24 is connected between the lift transmission mechanism 23 and the first-stage speed change transmission mechanism 21;

the primary variable-speed transmission mechanism 21 comprises a plurality of basic gears with output speeds from low to high;

the two-stage speed change transmission mechanism 22 comprises 3 gears, wherein the 3 gears comprise a normal gear, a boost gear and a reverse gear;

a cylinder body water channel 48 is annularly arranged at the upper part in the cylinder body 1, a fully-coated cylinder head water channel 50 is arranged around the combustion chamber in the cylinder head 2, the top of the cylinder body water channel 48 is communicated with the bottom of the cylinder head water channel 50, a box body water channel 11 is arranged on the crankcase body, a water channel water outlet pipe 47 communicated with the top of the cylinder head water channel 2 is arranged on the cylinder head 2, a water pump 10, a water inlet pipe 9 connected with the water pump inlet, a water inlet and outlet pipe 8 connected with the water pump outlet are arranged on the crankcase body, the water inlet and outlet pipe 8 is connected with a tank body water channel water inlet pipe 20, the tank body water channel water inlet pipe 20 is connected with a tank body water channel 11, the top of the tank body water channel 11 is communicated with the top of the cylinder body water channel 48, a water inlet channel I51 communicated with the side wall of the top of the cylinder body water channel 48 is arranged in the cylinder body 1, and the bottom of the water inlet channel I51 is communicated with the top of the tank body water channel 11.

In the embodiment, the output end of the engine is prevented from being converted by a reverse gear device through a self-contained two-stage speed change mechanism, a reverse gear mechanism, a speed change mechanism and a water circulation cooling system, so that the engine is transversely arranged on a vehicle body, an output shaft is directly connected with a connecting shaft, and on the basis of a basic gear, the two-stage gear shift mechanism is used for setting a normal gear, a boost gear and a reverse gear on the basic gear of the engine; the maximum output force variability of basic gears of the engine is realized, and compared with a common engine, the engine has a wider output force range, is suitable for more use environments, reduces energy loss and improves the fuel utilization rate.

The water circulation cooling system is provided with the box body water channel 11, cooling liquid enters the box body water channel, the box body water channel is communicated with the cylinder body water channel, the cooling liquid enters the cylinder body water channel through the box body water channel, then enters the cylinder head water channel through the cylinder body water channel, finally flows back to the water tank and cylinder body water channel through the water outlet in the cylinder head to form a half-wrapping structure, a main working area above a cylinder body is wrapped, the water channel in the cylinder head is of a full-wrapping structure, the whole combustion chamber is wrapped, a main hot area of engine combustion is effectively covered, the cooling liquid is vertically fed into the bottom of the cylinder body through the box body water channel 11, the flowing distance of the cooling liquid in the cylinder body and the cylinder head is favorably increased, the cooling area and the cooling area are increased, more heat can be taken away when.

In a preferred embodiment, the crankcase body comprises a left crankcase body 4, a left crankcase cover 6, a right crankcase body 5 and a right crankcase cover 7, the right crankcase body 5 and the periphery of the left crankcase body 4, the left crankcase cover 6 and the periphery of the left crankcase body 6, and the right crankcase cover 7 and the periphery of the right crankcase body 5 are fixedly connected through bolts, a cylinder body fixing seat 52 is arranged at the joint of the top of the right crankcase body 5 and the top of the left crankcase body 4, the left crankcase body and the right crankcase body are arranged in the embodiment, a primary variable transmission mechanism 21 and a secondary variable transmission mechanism 22 are respectively arranged on the left crankcase body and the right crankcase body, and bridging teeth are in transitional connection, so that the integration of a reverse gear mechanism and a variable transmission mechanism is conveniently realized, the output of an engine is prevented from being converted through a reverse gear device, the engine is transversely arranged on a vehicle body, and an output shaft is directly, reduce energy loss, promote fuel utilization ratio, the integrated position of one-level variable speed drive mechanism 21 and second grade variable speed drive mechanism 22 can be exchanged on left crankcase body or right crankcase body in this embodiment, is provided with bent axle chamber 53 and chain chamber 55 on the cylinder block fixing base 52, box water course 11 sets up on left bent axle box 4, box water course 11 one end is close to the tip of chain chamber 55, and the other end extends to near bent axle chamber 53, and this structure is through setting up box water course 11 and is being close to bent axle chamber 53 and chain chamber between 55 regional, not only is favorable to processing the cylinder block, is favorable to improving the cooling effect moreover.

In the preferred embodiment, the primary speed change transmission mechanism 21 comprises a primary transmission main shaft 25 connected with the crankshaft, a primary transmission auxiliary shaft 26, a primary gear shift mechanism 19 and a primary gear shift shaft 12 extending out of the right crankcase cover 7, the secondary speed-change transmission mechanism 22 comprises a secondary transmission main shaft 28, a secondary transmission auxiliary shaft 29, a secondary gear-shifting mechanism 16 and a secondary gear-shifting shaft 17 extending out of the left crankcase cover, the primary overbridge teeth 27 are sleeved on the primary transmission auxiliary shaft 26, the secondary overbridge teeth 30 are sleeved on the secondary transmission main shaft 28, the output shaft 3 is arranged at the end of a secondary transmission countershaft 29, the front internal half of which is similar to a normal engine in this embodiment, the first-stage output of power is realized by driving a first-stage main shaft combination through an engine cylinder 2 and a crankshaft, and the basic gear shifting is realized by the combination of a first-stage active combination and a first-stage auxiliary shaft combination and the change of a first-stage speed change mechanism; the secondary output is connected with a secondary main shaft combination through an auxiliary shaft, and the secondary main shaft combination and the secondary auxiliary shaft combination realize the multi-stage speed change and reverse gear functions through the control of a secondary speed change mechanism.

In a preferred embodiment, the secondary transmission main shaft 28 is sequentially provided with a normal gear driving gear 33, a reverse gear driving gear 34 and a boost gear driving gear 35, the secondary transmission auxiliary shaft 29 is sequentially provided with a normal gear driven gear 37 engaged with the normal gear driving gear 33, a reverse gear driven gear 38 and a boost gear driven gear 39 engaged with the boost gear driving gear 35, the reverse gear driving gear 34 and the reverse gear driven gear 38 are engaged and connected through a reverse idler gear 36, the transmission ratio between the normal gear driving gear 33 and the normal gear driven gear 37 is 1:1, the transmission ratio between the boost gear driving gear 35 and the boost gear driven gear 39 is greater than 1:1, in this embodiment, from the normal gear of the basic gear, to the boost gear of the basic gear, to the reverse gear and to the lifting operation, no additional external mechanism is needed, and the cost is reduced, saving material, occupying less space and being simple and convenient to operate.

In a preferred embodiment, the lifting transmission mechanism 23 includes a lifting idler shaft 42 disposed in the crankcase, a lifting shaft 31 and a lifting operation shaft 18 extending out of the crankcase, the lifting idler shaft 42 is provided with a lifting idler 24 engaged with the driven gear, the lifting shaft 31 is provided with a lifting combination claw 45 and a lifting gear 32 engaged with the lifting idler 24, the lifting operation shaft 18 is connected with a lifting fork 43 connected with the lifting combination claw 45, the lifting gear 32 is provided with a claw portion connected with the lifting combination claw 45, the lifting combination claw 45 is slidably sleeved on the lifting shaft 31 through a spline, the end of the lifting shaft 31 is provided with a lifting connection sleeve 40 connected with the lifter 14, in this embodiment, the lifting transmission mechanism 23 includes a lifting gear, a lifting shaft, a lifting combination claw, a lifting connection sleeve, a lifting fork, a lifting idler, a lifting connection sleeve, a lifting fork, a lifting idler, and a lifting operation shaft 18 extending out of the crankcase The lifting idler wheel shaft and the lifting operation shaft are driven by the lifting idler wheel, the lifting idler wheel is meshed with a gear of a transmission shaft in the crankcase body to realize transmission, and the lifting gear and the lifting idler wheel belong to a normally meshed state and are always in a rotating state; when the lifting mechanism is needed to control the working of the lifter, only the lifting control lever needs to be rotated, the lifting shifting fork is shifted by the aid of the lifting control lever to push the lifting combination claw, the claw part of the lifting combination claw is combined with the claw part of the lifting gear, the lifting combination claw rotates synchronously along with the lifting gear, the lifting combination claw is meshed with the lifting shaft through splines, and the lifting shaft rotates along with the lifting shaft when the lifting combination claw rotates.

In a preferred embodiment, a spline groove 41 connected with a transmission shaft of the lifter 14 is arranged in the lifting connecting sleeve 40, the lifting combining claw 45 and the lifting connecting sleeve 40 are arranged at two sides of the lifting gear 32, the lifting fork 43 is sleeved on the lifting idler shaft 42, in this embodiment, the lifting gear is arranged on a middle optical axis of the lifting shaft, a spline I used for being connected with the lifter is arranged in the lifting connecting sleeve, a spline ii used for being connected with the lifting connecting sleeve is arranged at the end part of the lifting shaft far away from the spline, a spline matched with the spline of the lifting shaft and the spline of the transmission shaft of the lifter is arranged in the lifting connecting sleeve, the lifting shaft realizes the connection transmission of the lifter shaft through the lifting connecting sleeve, the lifting connecting sleeve rotates together when the lifting shaft rotates, thereby driving the lifter, namely realizing the operation and control of the lifter, the other end suit that the combination claw was kept away from to lift the shift fork is on lifting idler shaft, lift shift fork tip and be provided with semicircle operation groove, it is provided with the annular to lift combination claw one end, the semicircle operation groove suit of lifting the shift fork is in lifting the annular that combines to grab, and this structure is favorable to installing the shift fork that lifts, is favorable to stirring through the shift fork that lifts and lifts combination claw for the claw portion that lifts combination claw combines with the claw portion that lifts the gear, makes to lift combination claw follow the lifting gear and rotate in step, and lifts and adopt the spline meshing to be in the same place between combination claw and the axle of lifting, lifts the axle and also follows the rotation when lifting combination claw rotates.

In a preferred embodiment, a sliding groove is formed in the upper surface of the lifting fork 43, a pin 44 inserted into the sliding groove and used for driving the lifting fork 43 to move in a rotating manner is arranged at the bottom of the lifting operating shaft 18, a lifting positioning bolt 46 is connected to the side of the lifting operating shaft 18, when a lifting mechanism is needed to operate the lifter, only the lifting operating lever needs to be rotated, the lifting fork is shifted by the pin on the lifting operating lever to push the lifting combined claw, the claw part of the lifting combined claw is combined with the claw part of the lifting gear, the lifting combined claw is rotated synchronously along with the lifting gear, the lifting combined claw and the lifting shaft are meshed together by adopting splines, the lifting shaft is rotated along with the lifting combined claw, a cylindrical step for limiting and positioning is arranged in the middle of the lifting operating shaft, an arc groove is arranged on the side wall of the cylindrical step, the crankcase body is provided with a lifting positioning bolt 46 for positioning the lifting operation shaft, a spring and a steel ball which is trapped in an arc groove of a cylindrical step and is used for positioning the lifting operation shaft are arranged in an inner cavity of the lifting positioning bolt 46, and the steel ball is trapped in the arc groove of the cylindrical step of the lifting operation shaft by means of the pressure of the spring to realize the positioning of the lifting operation shaft.

In a preferred embodiment, the water pump 10 is fixedly installed on the right crankcase cover 7, a water channel water inlet 20 connected with the water inlet and outlet pipe 8 is arranged at the top of the left crankcase body 4 close to the cylinder block 1, the case body water channel 11 is communicated with the water channel water inlet 20, the embodiment adopts a semi-integrated structure, the water pump 10 is integrally fixed on the right crankcase cover 5 by utilizing the water pump cover and the water inlet and outlet pipe 8, engine coolant enters the water pump after passing through the water tank, the engine coolant flows out from the water pump after being pressurized and flows out from the water nozzle of the right crankcase cover, water channel water supply power is provided by rotation on the water pump, the water channel starts from the water pump water outlet connector, is pressurized by the water pump, enters the case body water channel through the water channel water inlet connector of the water channel, then enters the cylinder body water channel and the cylinder head water channel, the cooling effect is good.

In a preferred embodiment, a water inlet channel 49 for communicating a cylinder head water channel 50 and a cylinder head water channel 48 up and down is arranged between the top of the cylinder body 1 and the bottom of the cylinder head 2, the water inlet channels 49 are arranged into 4 pairs, and each pair of the water inlet channels 49 are uniformly distributed around the cylinder body 1 and the cylinder head 2, so that the structure is favorable for taking away more heat when a cooling liquid circulates, the temperature of an engine is effectively controlled, and the service life of a sealing gasket at the joint between the cylinder body 1 and the cylinder head 2 is prolonged.

The preferred embodiment, be provided with the magnetoelectric mechanism of being connected with the bent axle other end in the left side bent axle box 4, be provided with magnetoelectric mechanism installation lid 15 on the left side bent axle box lid 6, be close to magnetoelectric mechanism department on the left side bent axle box 4 in this embodiment and be provided with clutch control rod 56, be favorable to with magnetoelectric mechanism and clutch integration on the box, conveniently start-up engine conveniently shifts the operation simultaneously.

In the preferred embodiment, a balance shaft mechanism is arranged in the right crankcase body 5, the balance mechanism comprises a balance shaft 59, a balance shaft 59 driven gear 58 arranged on the balance shaft 59 and a balance shaft driving gear 57 arranged on the crankshaft, and the balance shaft mechanism is beneficial to the transmission stability of the engine by integrating a balance shaft system.

Finally, it is noted that the above-mentioned preferred embodiments illustrate rather than limit the invention, and that, although the invention has been described in detail with reference to the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of the invention as defined by the appended claims.