TWI385305B - Support structure for shaft of water pump in vehicle engine - Google Patents

Description

Water pump shaft support structure for vehicle engine Support Structure for Shaft of Water Pump in Vehicle Engine

The present invention relates to a water pump shaft support structure for a vehicle engine, and more particularly to a water pump shaft support structure for a vehicle engine that can improve assembly reliability and assembly convenience.

Nowadays, the internal combustion engine of the general-speed locomotive locomotive will inevitably increase the working temperature of the internal combustion engine during the combustion of gasoline. If the working temperature is too high, the volume expansion of the component will increase and the gap between the components will change. Small and oily viscosity is reduced, resulting in increased friction and loss between components, and higher temperatures due to friction, which ultimately causes the internal combustion engine to be damaged by overheating. Therefore, during the operation of the internal combustion engine, it is necessary to continuously dissipate the heat energy generated by it to ensure proper operation. At present, the conventional cooling and cooling structure of an internal combustion engine can be roughly classified into a water-cooled type, an air-cooled type, an oil-cooled type, etc., which are mostly attached to the outer casing of the internal combustion engine, and heat-dissipating the internal combustion engine through the relevant pipes, thereby achieving cooling and cooling. The purpose. In the case of a water-cooled cooling and cooling structure, it usually has a water pump module attached to the outer casing of the internal combustion engine to drive the water-liquid circulation flow for heat exchange.

For example, please refer to FIG. 1 , the utility model patent No. 2727408 discloses a motorcycle engine water pump, which comprises a pump body 101, a pump cover 103 with a water inlet passage 102, a skeleton oil seal 104, and two bearings 105. And a water outlet passage 107, an impeller 110 connected to the top end of the water pump shaft 109 in the pump chamber 108, and a gear 112 connected to the water pump shaft 109 through the shaft retaining ring 111, wherein the pump body 101 is sealingly fitted in the crankcase cover 113 The pump cover 103 is sealingly mounted on the crankcase cover 113. The pump chamber 108 is integrally surrounded by the pump cover 103, the pump body 101, and the crankcase cover 113. The water outlet passage 107 communicating with the pump chamber 108 is disposed in the crankcase. On the cover 113, the water pump shaft 109 is connected to the pump body 101 via the two bearings 105 and 106. The pump cover 103, the pump body 101, and the crankcase cover 113 are sealed to each other by a plurality of seal rings 115. Furthermore, a mechanical sealing mechanism 114 is composed of an elastic sealing rubber sleeve 116, a spring 117, a graphite ring 118, a ceramic ring 119 and a sealing ring 120 which are sleeved on the water pump shaft 109, wherein the spring 117 has two ends against the elastic seal. Above the rubber sleeve 116 and inside the lower end edge, the outer edge of the lower end edge of the elastic sealing rubber sleeve 116 abuts against the ring platform of the pump body 101, and the outer edge of the upper end edge abuts against the graphite ring 118, so that the graphite ring 118 can move axially. On the ceramic ring 119, the ceramic ring 119 is bonded to the bottom of the impeller 110 by a seal ring 120 and is rotatable in synchronism with the impeller 110. Therefore, it is ensured that the water of the impeller 110 side does not leak into the inside of the engine through the slit when the impeller 110 rotates.

Although the above-mentioned water pump is convenient for assembly and maintenance due to the modular design, the water pump still has the following problems in practical use: since the two bearings 105 and 106 of the water pump shaft 109 are all disposed on the same side of the gear 112 and both are pumps The body 101 is supported so that only one side support effect can be provided. However, the force exerted by the gear 112 in conjunction with the gear (not shown) of the engine crankshaft is difficult to balance by the one-sided support, so that the unbalanced yaw of the water pump shaft 109 is easily generated, causing the rotation of the gear 112 to be abnormal, and Each seal is worn and leaks.

Furthermore, please refer to FIG. 2, the utility model patent No. 2709658 discloses a motorcycle water pump, which comprises a member similar to the utility model patent No. 2727408, and uses a similar figure number, but the difference is characterized by The middle portion of the water pump shaft 109 is connected to the pump body 101 by a bearing 105, and the inner end of the water pump shaft 109 is connected to the crankcase body 121 by another bearing 106. In contrast, the two bearings 105 and 106 of the utility model patent No. 2709658 are provided on the two sides of the gear 112, so that the double side support effect can be provided to improve the balance of rotation, but the water pump still has the following problems in practical use: the water pump The inner end of the shaft 109 has a stepped portion 122 that can abut the inner ring of the bearing 106 to secure the bearing 106 within the bore of the crankcase body 121 after assembly. However, during assembly, the bearing 106 can only be fitted into the hole of the crankcase body 121 by its outer ring, so that it can easily fall off the hole and cause inconvenience in assembly or maintenance disassembly. Moreover, due to the inevitable cumulative assembly tolerance between the components of the water pump itself and between the water pump and the crankcase body 121, when the assembly tolerance is too large, the surface of the stepped portion 122 of the inner end of the water pump shaft 109 will be There is an excessive gap between the inner ring surfaces of the bearing 106, and they cannot abut each other. As a result, the fixed position bearing 106 may not be stably fixed, and vibration abnormal noise may occur due to the looseness of the bearing 106 under normal operation. Alternatively, if the assembly tolerance is too small, the stepped portion 122 of the water pump shaft 109 is forced to excessively abut against the inner ring of the bearing 106, causing the bearing 106 to be stuck and unable to rotate, or the pump module as a whole cannot be tightly embedded and mounted on the crankshaft. On the lid 113.

Therefore, it is necessary to provide a water pump shaft support structure for a vehicle engine to solve the problems of the prior art.

The main object of the present invention is to provide a water pump shaft support structure for a vehicle engine, which uses a bearing in a bearing housing of a crankcase body as a first support portion to support an inner end of a water pump shaft, and a shaft hole of the water pump body. The second support portion supports the middle section of the water pump shaft, wherein the bearing seat is provided with a positioning component for positioning the bearing, and the shaft hole directly utilizes the oil in the crankcase body to provide lubrication effect, thereby simplifying the pump construction and improving assembly. Convenience and assembly reliability, increased rotational stability, reduced rotational noise, and extended service life.

In order to achieve the above object, the present invention provides a water pump shaft support structure for a vehicle engine, which is used for supporting a water pump shaft of a water pump module, wherein the water pump module further comprises a water pump body, a water pump cover body and an impeller. And a gear body, the water pump body is mounted on a crankcase body, the water pump cover body is disposed outside the water pump body, the impeller is coupled to the first end of the water pump shaft and located in the water pump cover body, and the The gear is coupled to the adjacent section of the second end of the water pump shaft, wherein the support structure comprises a first support portion and a second support portion, wherein the first support portion is one of the crankcase bodies a bearing in the bearing housing, the second supporting portion is a shaft hole of the water pump body, the water pump rotating shaft is supported by the bearing seat and the shaft hole, and the bearing seat of the crankcase body is further provided with a positioning component for securing Position the bearing.

In an embodiment of the present invention, the second end of the water pump shaft is formed with a small diameter portion and a stepped portion, the small diameter portion is inserted into the bearing, and the step portion and the positioning member have a spacing.

In an embodiment of the invention, the positioning component is a circlip, and an inner groove of the bearing housing is provided with an annular groove for fixing the circlip.

In an embodiment of the invention, the positioning component is a fixing piece, and an inner wall of the bearing seat is provided with a fixing groove for inserting and fixing the fixing piece.

In an embodiment of the present invention, the crankcase body is provided with a screw hole on the inner wall of the fixing groove, and the screw hole is provided with a screw to fix the fixing piece in the fixing groove.

In an embodiment of the invention, the positioning component is a nut having an external thread, and the inner wall of the bearing seat is internally threaded to screw the nut.

In an embodiment of the invention, the inner wall of the shaft hole of the water pump body is formed with at least one oil inlet gap to guide the lubricating oil into the shaft hole.

In an embodiment of the invention, the inner wall of the shaft hole of the water pump body is further formed with at least one oil outlet to guide the lubricating oil out of the shaft hole.

In an embodiment of the invention, the oil inlet gap and the oil outlet gap are located on opposite sides of the shaft hole.

In an embodiment of the invention, the area of the oil inlet gap is larger than the area of the oil discharge gap.

In an embodiment of the present invention, an elastic sealing mechanism is further disposed in one of the assembly holes of the water pump body, and the elastic sealing mechanism includes an oil seal having an oil seal ring groove communicating with the oil inlet gap. And the oil gap.

In an embodiment of the invention, the bearing is selected from the group consisting of a ball bearing, a needle bearing or an oil bearing.

Furthermore, the present invention provides a water pump shaft support structure for another vehicle engine for supporting a water pump shaft of a water pump module, wherein the water pump module further comprises a water pump body, a water pump cover body, an impeller and a pump a gear body, the water pump body is mounted on a crankcase body, the water pump cover body is disposed outside the water pump body, the impeller is coupled to one of the first ends of the water pump shaft and located in the water pump cover body, and the gear combination An adjacent portion of the second end of the water pump shaft, wherein the support structure comprises a first support portion and a second support portion, wherein the first support portion is a bearing housing of the crankcase body a bearing in the second support portion is a shaft hole of the water pump body, the water pump shaft is supported by the bearing seat and the shaft hole, and at least one oil gap is formed on the inner wall of the shaft hole of the water pump body and at least An oil notch guides the lubricating oil into the shaft hole, and the oil outlet guides the lubricating oil out of the shaft hole.

The above and other objects, features and advantages of the present invention will become more <RTIgt;

Referring to FIG. 3, the water pump shaft support structure of the vehicle engine of the present invention is mainly applied to a small-sized vehicle having an engine and a water pump, such as various locomotives or ATVs, wherein the present invention is a water pump module. 20 is assembled on one of the crankcase bodies 30 of an engine, and the support structure provided by the present invention ensures the assembly reliability, assembly convenience and rotational stability of the water pump shaft 21 of the water pump module 20. The present invention refers to the above, the lower left, the right, the inner and the outer, and the like, with reference to the direction of the locomotive in the normal normal use state in the drawing, and the above orientation language is only used to assist in explaining the related components. The assembly relationship is not intended to limit the invention, and is described in the foregoing.

Referring to Figures 3 and 3A, the water pump module 20 of the first embodiment of the present invention mainly includes the water pump shaft 21, a water pump body 22, a water pump cover body 23, an impeller 24, a gear 25, and an elastic seal. The mechanism 26; at the same time, the crankcase body 30 mainly comprises a bearing seat 31, a bearing 32, an annular groove 33 and a positioning element 34. The support structure of the present invention comprises a first support portion A and a second support portion B, wherein the first support portion A is a bearing 32 in a bearing housing 31 of the crankcase body 30; and, the second The support portion B is a shaft hole 221 of the water pump body 22.

Referring to Figures 3 and 3A again, the water pump shaft 21 of the first embodiment of the present invention is preferably a metal shaft having a first end 211 (inner end) and a second end 212 (outer end). And an intermediate portion 213, wherein the first end 211 is configured to be coupled to the impeller 24; the second end 212 is rotatably inserted into the bearing 32 of the first support portion A; and the intermediate portion 213 The shaft hole 221 (ie, the second support portion B) passing through the water pump body 22 is bored. As shown in FIG. 3A, at the first support portion A of the present invention, the bearing housing 31 of the crankcase body 30 is further provided with the positioning member 34 for stably fixing the bearing 32. The bearing 32 can be selected from a ball bearing, a needle bearing, an oil bearing or other type of bearing. In this embodiment, the positioning component 34 is a circlip, such as a C-shaped buckle or an E-shaped buckle. Meanwhile, the inner wall of the bearing housing 31 is provided with an annular groove 33 for fixing the circlip. Therefore, during the assembly of the water pump module 20, the bearing 32 can be stably fixed in the bearing housing 31 by using the positioning component 34 in advance, thereby preventing the bearing 32 from accidentally disengaging from the bearing housing 31, thereby improving assembly convenience. The rotation stability of the water pump shaft 21 can be increased and the rotational noise can be reduced. In addition, the second end 212 of the water pump shaft 21 is further formed with a small diameter portion 212a and a first step portion 212b. The small diameter portion 212a can be inserted into the bearing 32, and the step portion 212b and The positioning elements 34 are maintained at a predetermined spacing, which must be controlled to be greater than the cumulative assembly tolerances that may exist in the water pump module 20 to avoid affecting the assembly yield or rotational stability of the water pump shaft 21 due to cumulative assembly tolerances. Potential problem.

Referring to Figures 3, 3A and 3B, the water pump body 22 of the first embodiment of the present invention is preferably made of metal. The water pump body 22 is similar to the conventional crankcase cover. The water pump body 22 can be mounted. On the crankcase body 30, the water pump body 22 is provided with the assembly hole 220 and the shaft hole 221 communicating with each other. The hole of the shaft hole 221 is smaller than the assembly hole 220, and the shaft hole 221 is used as the Second support portion B. The shaft hole 221 is directly permeable to the intermediate portion 213 of the water pump shaft 21 so as to support the water pump shaft 21 and enable the water pump shaft 21 to The water pump body 22 is rotated relative to the water pump body 22. During operation of the engine, lubricating oil (ie, oil) in the crankcase body 30 may penetrate into the shaft hole 221 of the water pump body 22 to lubricate the inner wall thereof, thereby reducing friction between the water pump shaft 21 and the shaft hole 221. force. In the present invention, since the second support portion B directly supports the water pump shaft 21 by the shaft hole 221, the arrangement of the bearing can be omitted, and the configuration of the second support portion B can be relatively simplified. Furthermore, the inner wall of the shaft hole 221 is preferably formed with at least one oil inlet notch 222 for further increasing the efficiency of guiding the lubricating oil into the shaft hole 221. The inner wall of the shaft hole 221 of the water pump body 22 is preferably formed with at least one oil outlet 223 to guide the lubricating oil out of the shaft hole 221. The oil inlet notch 222 and the oil outlet notch 223 are preferably located on opposite sides of the shaft hole 221, and the area of the oil inlet notch 222 is larger than the area of the oil extraction notch 223.

Referring to FIG. 3 again, the water pump cover body 23 of the first embodiment of the present invention is a cover body made of metal, which can be assembled or coupled to the water pump body 22 or directly formed integrally with the water pump body 22. The water pump cover body 23 is disposed outside the water pump body 22, and a chamber 230 is formed in the interior of the water pump cover body 23 to communicate with one of the assembly holes 220 of the water pump body 22. The water pump cover 23 is provided with a water inlet channel 231 and a water outlet channel (not shown) for introducing water into the chamber 230 and deriving the chamber 230, respectively. Furthermore, the impeller 24 is coupled to the first end 211 of the water pump shaft 21 and is located in the chamber 230 of the water pump cover 23. The impeller 24 has a plurality of vanes (not labeled) for driving the circulating flow of water and liquid. In addition, the gear 25 is coupled to an adjacent section of the second end 212 of the water pump shaft 21, wherein a crankshaft (not shown) in the crankcase body 30 can be driven via at least one interlocking gear (not shown). The gear 25 and the water pump shaft 21 rotate. It should be noted that, in the present invention, the first supporting portion A and the second supporting portion B are respectively located on two sides of the gear 25, so that the double-sided supporting effect can be provided, and the rotation of the gear 25 can be effectively improved. Turn the balance problem to increase rotational stability and reduce running noise.

The elastic sealing mechanism 26 of the first embodiment of the present invention is mounted in the assembly hole 220 of the water pump body 22 and interposed between the impeller 24 and the shaft hole 221, as shown in FIGS. 3, 3A and 3B. In order to ensure that the impeller 24 is rotating, the water on the impeller 24 side does not leak into the crankcase body 30 through the slit. In the present invention, the elastic sealing mechanism 26 is of a conventional construction of a general water pump, and thus its detailed construction will not be described in detail. However, in the present embodiment, the elastic sealing mechanism 26 includes an oil seal 261 having an oil seal ring groove 260, and the oil seal ring groove 260 is connected to the oil inlet notch 222 and the oil discharge notch 223. After the oil inlet notch 222 of the water pump body 22 introduces the lubricating oil into the shaft hole 221, the lubricating oil flows into the oil seal ring groove 260, and then flows back into the crankcase body 30 via the oil discharge notch 223.

Referring to FIG. 4A, the water pump shaft support structure of the vehicle engine according to the second embodiment of the present invention is similar to the first embodiment of the present invention, and substantially uses the same figure number, but the difference between the two is characterized by: The first embodiment of FIG. 3A does not change the diameter of the original water pump shaft 21 as much as possible, and only the second end 212 is partially processed to form the small diameter portion 212a and the step portion 212b to match the bearing 32 and avoid contact with the bearing 32. Positioning element 34. In contrast, the second embodiment of FIG. 4A can directly insert the second end 212 of the water pump shaft 21 by reducing the diameter of the original water pump shaft 21 or increasing the size of the bearing housing 31 and the bearing 34. It is disposed within the bearing 34 without the additional processing of the existing shape of the second end 212. Thereby, the assembly design margin of the first support portion A of the present invention applied to different product designs can be increased.

Referring to FIGS. 4B and 4C, the water pump shaft support structure of the vehicle engine according to the third and fourth embodiments of the present invention is similar to the first and second embodiments of the present invention, and generally uses the same drawing number, but in the meantime. The difference is characterized in that the positioning member 34' of the third embodiment of the fourth embodiment is selected from a fixing piece, and the inner wall of the bearing housing 31 is provided with a fixing groove 33' for inserting and fixing the fixing piece, wherein The fixing groove 33' may be formed in a groove shape or a slot shape. At the same time, the crankcase body 30 is provided with a screw hole (not shown) on the inner wall of the fixing groove 33'. The screw hole is provided with a screw 35 for fixing the fixing piece in the fixing groove 33' (positioning element 34' ). On the other hand, the positioning member 34" of the fourth embodiment of the fourth embodiment is selected from a nut having an external thread, and the inner wall of the bearing housing 31 is provided with an internal thread for screwing the nut. (positioning element 34"). With the positioning member 34' or 34" of the third or fourth embodiment, the first supporting portion A of the present invention can also stably fix the bearing 32 to improve assembly convenience, assembly reliability, and rotational stability. Reduce the turning noise.

As described above, the bearing 106 of the conventional water pump shaft 109 of FIG. 2 has disadvantages such as inconvenience in assembly or maintenance disassembly, and excessive or excessive assembly tolerance, and the present invention is based on the crankcase of FIGS. 3 to 4C. The bearing 32 in the bearing housing 31 of the body 30 serves as the first support portion A to support the second end 212 of the water pump shaft 21, and the shaft hole 221 of the water pump body 22 serves as the second support portion B. The middle portion 213 of the water pump shaft 21, wherein the bearing block 31 is further provided with the positioning member 34 for positioning the bearing 32, and the shaft hole 221 directly utilizes the oil in the crankcase body 30 to provide lubrication, so It can relatively simplify the pump structure, improve assembly convenience and assembly reliability, increase rotational stability, reduce rotational noise, and extend service life.

The present invention has been disclosed in its preferred embodiments, and is not intended to limit the invention, and the present invention may be modified and modified without departing from the spirit and scope of the invention. The scope of protection is subject to the definition of the scope of the patent application.

101. . . Pump body

102. . . Water inlet channel

103. . . Pump cover

104. . . Skeleton oil seal

105. . . Bearing

106. . . Bearing

107. . . Water passage

108. . . Pump chamber

109. . . Pump shaft

110. . . impeller

111. . . Shaft retaining ring

112. . . gear

113. . . Crankcase cover

114. . . Mechanical sealing mechanism

115. . . Seal ring

116. . . Elastic sealant sleeve

117. . . spring

118. . . Graphite ring

119. . . Ceramic ring

120. . . Seal ring

121. . . Crankcase body

122. . . Step

20. . . Water pump module

twenty one. . . Pump shaft

211. . . First end

212. . . Second end

212a. . . Small diameter department

212b. . . Step

213. . . Intermediate section

twenty two. . . Pump body

220. . . Assembly hole

221. . . Shaft hole

222. . . Oil gap

223. . . Oil return gap

twenty three. . . Water pump cover

230. . . Chamber

231. . . Water inlet channel

twenty four. . . impeller

25. . . gear

26. . . Elastic sealing mechanism

260. . . Oil seal ring groove

261. . . Oil seal

30. . . Crankcase body

31. . . Bearing housing

32. . . Bearing

33. . . Annular groove

33’. . . Fixed slot

34. . . Positioning element

34’. . . Positioning element

34"...positioning component

35. . . Screw

A. . . First support

B. . . Second support

Figure 1: A cross-sectional view of a combination of a conventional motorcycle engine water pump.

Figure 2: A cross-sectional view of a combination of a conventional motorcycle water pump.

Fig. 3 is a sectional view showing the combination of a water pump shaft support structure of a vehicle engine according to a first embodiment of the present invention.

Fig. 3A is a partial enlarged view of Fig. 3 of the present invention.

Fig. 3B is a partially enlarged perspective view showing the inner surface of the water pump body of Fig. 3 of the present invention.

4A is a partial enlarged view of a first support portion of a water pump shaft support structure of a vehicle engine according to a second embodiment of the present invention.

Fig. 4B is a partial enlarged view of the first support portion of the water pump shaft support structure of the vehicle engine according to the third embodiment of the present invention.

4C is a partial enlarged view of the first support portion of the water pump shaft support structure of the vehicle engine according to the fourth embodiment of the present invention.

20. . . Water pump module

twenty one. . . Pump shaft

211. . . First end

212. . . Second end

213. . . Intermediate section

twenty two. . . Pump body

220. . . Assembly hole

221. . . Shaft hole

222. . . Oil gap

223. . . Oil return gap

twenty three. . . Water pump cover

230. . . Chamber

231. . . Water inlet channel

twenty four. . . impeller

25. . . gear

26. . . Elastic sealing mechanism

30. . . Crankcase body

31. . . Bearing housing

32. . . Bearing

33. . . Annular groove

34. . . Positioning element

A. . . First support

B. . . Second support

Claims (23)

A water pump shaft support structure for a vehicle engine for supporting a water pump shaft of a water pump module, wherein the water pump module further comprises a water pump body, a water pump cover body, an impeller and a gear, the water pump body assembly The water pump cover body is disposed on the outer surface of the water pump body, the impeller is coupled to the first end of the water pump shaft and located in the water pump cover body, and the gear is coupled to one of the water pump shafts. The support structure includes a first support portion and a second support portion, wherein the first support portion is a bearing in a bearing housing of the crankcase body, the first support portion The second supporting portion is a shaft hole of the water pump body, and the water pump rotating shaft is supported by the bearing seat and the shaft hole, and the bearing seat of the crankcase body is further provided with a positioning component for stably fixing the bearing. The water pump shaft support structure of the vehicle engine according to the first aspect of the invention, wherein the second end of the water pump shaft is formed with a small diameter portion and a stepped portion, the small diameter portion being inserted into the bearing, and The step has a spacing from the positioning element. The water pump shaft support structure for a vehicle engine according to claim 1, wherein the positioning member is a circlip, and an inner groove of the bearing housing is provided with an annular groove for fixing the circlip. The water pump shaft support structure of the engine for an engine according to claim 1, wherein the positioning member is a fixing piece, and an inner wall of the bearing housing is provided with a fixing groove for inserting and fixing the fixing piece. The water pump shaft support structure of the vehicle engine according to the fourth aspect of the invention, wherein the crankcase body is provided with a screw hole on the inner wall of the fixing groove, and the screw hole is provided with a screw to fix the fixing groove. Fixed piece. The water pump shaft support structure for a vehicle engine according to claim 1, wherein the positioning member is a nut having an external thread, and an inner wall of the bearing housing is internally threaded to be screwed Nuts. The water pump shaft support structure for a vehicle engine according to claim 1, wherein an inner wall of the shaft hole of the water pump body is formed with at least one oil inlet gap to guide the lubricating oil to flow into the shaft hole. The water pump shaft support structure of the engine for an engine according to the seventh aspect of the invention, wherein the inner wall of the shaft hole of the water pump body is further formed with at least one oil outlet to guide the lubricating oil to flow out of the shaft hole. The water pump shaft support structure for a vehicle engine according to claim 8, wherein the oil inlet notch and the oil discharge gap are located on opposite sides of the shaft hole. The water pump shaft support structure for a vehicle engine according to claim 8, wherein an area of the oil inlet gap is larger than an area of the oil discharge gap. The water pump shaft support structure for a vehicle engine according to claim 8, further comprising an elastic sealing mechanism installed in one of the assembly holes of the water pump body, wherein the elastic sealing mechanism comprises an oil seal, the oil seal having An oil seal ring groove is connected to the oil inlet gap and the oil discharge gap. The water pump shaft support structure for a vehicle engine according to claim 1, wherein the bearing is selected from the group consisting of a ball bearing, a needle bearing or an oil bearing. A water pump shaft support structure for a vehicle engine for supporting a water pump shaft of a water pump module, wherein the water pump module further comprises a water pump body, a water pump cover body, an impeller and a gear, the water pump body assembly The water pump cover body is disposed on the outer surface of the water pump body, the impeller is coupled to the first end of the water pump shaft and located in the water pump cover body, and the gear is coupled to one of the water pump shafts. The support structure includes a first support portion and a second support portion, wherein the first support portion is a bearing in a bearing housing of the crankcase body, the first support portion The second support portion is a shaft hole of the water pump body, and the water pump shaft is supported by the bearing seat and the shaft hole, and the inner wall of the shaft hole of the water pump body is formed with at least one oil inlet gap and at least one oil gap. The oil notch guides the lubricating oil into the shaft hole, and the oil outlet notches the lubricating oil to flow out of the shaft hole. The water pump shaft support structure of the vehicle engine according to claim 13, wherein the second end of the water pump shaft is formed with a small diameter portion and a stepped portion, the small diameter portion being inserted into the bearing, and The step has a spacing from the positioning element. The water pump shaft support structure of the engine for an engine according to claim 13, wherein the bearing housing of the crankcase body is further provided with a positioning component for stably fixing the bearing. The water pump shaft support structure for a vehicle engine according to claim 15, wherein the positioning member is a circlip, and an inner groove of the bearing housing is provided with an annular groove for fixing the circlip. The water pump shaft support structure for a vehicle engine according to claim 15, wherein the positioning member is a fixing piece, and an inner wall of the bearing housing is provided with a fixing groove for inserting and fixing the fixing piece. The water pump shaft support structure of the vehicle engine according to claim 17, wherein the crankcase body is provided with a screw hole on the inner wall of the fixing groove, and the screw hole is provided with a screw to fix the fixing groove. Fixed piece. The water pump shaft support structure for a vehicle engine according to claim 15, wherein the positioning member is a nut having an external thread, and an inner wall of the bearing housing is internally threaded to be screwed Nuts. The water pump shaft support structure for a vehicle engine according to claim 13, wherein the oil inlet notch and the oil discharge gap are located on opposite sides of the shaft hole. The water pump shaft support structure for a vehicle engine according to claim 13, wherein the area of the oil inlet gap is larger than the area of the oil discharge gap. The water pump shaft support structure for a vehicle engine according to claim 13, further comprising an elastic sealing mechanism installed in one of the assembly holes of the water pump body, wherein the elastic sealing mechanism comprises an oil seal, the oil seal having An oil seal ring groove is connected to the oil inlet gap and the oil discharge gap. The water pump shaft support structure for a vehicle engine according to claim 13, wherein the bearing is selected from a ball bearing, a needle bearing or an oil bearing.