Motorcycle engine cooling water pump

Abstract

The utility model belongs to motorcycle engine technical field, especially point to a motorcycle engine cooling water pump, including the pump body, be equipped with the pump cavity in the pump body, be equipped with the impeller in the pump cavity, be equipped with total water inlet channel, installation cavity, small circulation water inlet channel, big circulation water outlet channel, big circulation water inlet channel and pump water outlet channel in the pump body, be equipped with the thermostat in the installation cavity, the thermostat divides into chamber one and chamber two two chambers with installation cavity, total water inlet channel links chamber one, small circulation water inlet channel links chamber one and the pump cavity, big circulation water outlet channel links chamber two, big circulation water inlet channel links the pump cavity, pump water outlet channel links the pump cavity, when temperature does not reach the set value, the thermostat disconnects the intercommunication of chamber one and chamber two, when temperature reaches the set value, the thermostat links chamber one and chamber two. The utility model structure is compact, and the space is small, and the installation is simple and convenient.

Description

Technical fields:

[0001] This utility model belongs to the field of motorcycle engine technology, and specifically refers to a motorcycle engine cooling water pump. Background technology:

[0002] Motorcycle water-cooled engines rely on water for cooling. The cooling system consists of a water pump, radiator, and connecting pipes. The cooling water circulation operates in two states: a large circulation at high temperatures and a small circulation at low temperatures. The large circulation coolant passes through the radiator and water pump, while the small circulation coolant passes through the water pump but not the radiator. The large and small circulations are automatically controlled by a thermostat installed on the piping.

[0003] Chinese invention patent (publication number CN107489509A, application date 2017.10.19, publication date 2017.12.19) discloses a water cooling device for a motorcycle engine, including a cylinder head, a cylinder block, a water channel, a water pump, an oil pump gear, and a thermostat. A first water channel is provided on the cylinder head, and a second water channel is provided on the cylinder block. The second water channel is connected to the outlet of the water pump, and the first and second water channels are interconnected. The water pump is driven by the oil pump gear. A micro-generator is provided on the cylinder block, and the micro-generator is driven by the oil pump gear. A refrigeration structure is provided on the cylinder block, electrically connected to the micro-generator, and connected to the second water channel. A water inlet is provided at the lower part of the cylinder block, communicating with the second water channel, and a water outlet is provided at the upper part of the cylinder head, communicating with the first water channel. The outlet is connected to a thermostat via a conduit, and the thermostat is equipped with a sensor to detect the water temperature. The thermostat has a high-temperature pipe and a low-temperature pipe. The high-temperature pipe is connected to the radiator, which is connected to the water pump; the low-temperature pipe is directly connected to the water pump. Coolant flows out from the outlet located on the cylinder head, through the conduit to the thermostat. The sensor inside the thermostat automatically detects the water temperature. When the water temperature exceeds a specified value, the high-temperature valve opens, and water flows from the high-temperature pipe to the radiator. After being cooled by the radiator, it flows back to the water pump by gravity. When the water temperature does not exceed the specified value, the low-temperature valve opens, and water flows back to the water pump from the low-temperature pipe, thus completing the cycle.

[0004] The shortcomings of the above-mentioned motorcycle engine water cooling system are that the thermostat and water pump are set separately, and the thermostat, water pump and cylinder block are connected by additional water pipes respectively. The structure is not compact, occupies a lot of space, and is more troublesome to install. Utility Model Content:

[0005] The purpose of this invention is to provide a motorcycle engine cooling water pump that has a compact structure, occupies little space, and is simple and convenient to install.

[0006] This utility model is implemented as follows:

[0007] A motorcycle engine cooling water pump includes a pump body with a pump chamber inside. An impeller is located within the pump chamber. The pump body also includes a main inlet channel, an mounting cavity, a small circulation inlet channel, a large circulation outlet channel, a large circulation inlet channel, and a pump outlet channel. A thermostat is installed within the mounting cavity, dividing the mounting cavity into two chambers: chamber one and chamber two. The main inlet channel connects to chamber one, the small circulation inlet channel connects to chamber one and the pump chamber, the large circulation outlet channel connects to chamber two, the large circulation inlet channel connects to the pump chamber, and the pump outlet channel connects to the pump chamber. When the temperature does not reach a set value, the thermostat disconnects the connection between chamber one and chamber two; when the temperature reaches the set value, the thermostat connects chamber one and chamber two.

[0008] In the aforementioned motorcycle engine cooling water pump, the pump body includes a front pump housing and a rear pump housing. The pump chamber is formed in the middle of the pump body, and the mounting cavity is formed at the upper end. A small circulation water inlet channel is disposed between the front pump housing and the rear pump housing. The front pump housing has a large circulation water outlet pipe at the upper end and a large circulation water inlet pipe in the middle. The inner cavity of the large circulation water outlet pipe is the large circulation water outlet channel, and the inner cavity of the large circulation water inlet pipe is the large circulation water inlet channel. The rear pump housing has a main water inlet pipe at the upper end and a pump outlet pipe at the lower end. The inner cavity of the main water inlet pipe is the main water inlet channel, and the inner cavity of the pump outlet pipe is the pump outlet channel.

[0009] In the aforementioned motorcycle engine cooling water pump, the large circulation outlet pipe, the large circulation inlet pipe, and the front pump housing are integrated into one structure, and the main inlet pipe, the pump outlet pipe, and the rear pump housing are integrated into one structure. The front pump housing and the rear pump housing are fixedly connected by screws.

[0010] In the aforementioned motorcycle engine cooling water pump, an installation pipe is provided on the main water inlet pipe, and a temperature sensor for detecting the water temperature of the main water inlet pipe is installed on the installation pipe.

[0011] In the aforementioned motorcycle engine cooling water pump, the rear end of the rear pump housing is provided with a mounting boss that mates with the mounting hole on the cylinder head. A pump shaft coaxial with the mounting boss and with one end protruding from the mounting boss is rotatably mounted on the pump body. The impeller is fixedly mounted on the pump shaft. The rear end of the rear pump housing is provided with a mounting platform that mates with the mounting plane on the cylinder head. The mounting boss is located within the mounting platform.

[0012] In the aforementioned motorcycle engine cooling water pump, the end of the pump shaft extending from the mounting boss is connected to the crankshaft that drives the valve.

[0013] In the aforementioned motorcycle engine cooling water pump, a sealing ring is provided between the mounting platform and the mounting plane on the cylinder head, and a sealing ring is provided between the front pump housing and the rear pump housing.

[0014] In the aforementioned motorcycle engine cooling water pump, the pump shaft is rotatably connected to the mounting boss via two bearings, an oil seal is provided between the pump shaft and the mounting boss located in front of the bearings, and an integrated water seal is provided between the rear pump housing and the pump shaft located in front of the oil seal.

[0015] In the aforementioned motorcycle engine cooling water pump, the main water inlet pipe is inserted into the cylinder head water outlet pipe on the cylinder head, the pump water outlet pipe is inserted into the cylinder head water inlet pipe on the cylinder head, the large circulation water outlet pipe is connected to the radiator inlet, and the large circulation water inlet pipe is connected to the radiator outlet.

[0016] In the aforementioned motorcycle engine cooling water pump, screws pass through the front pump housing and the rear pump housing in sequence and are screwed to the cylinder head.

[0017] In the aforementioned motorcycle engine cooling water pump, the thermostat includes a front bracket, a rear bracket mounted on the front bracket, and a valve core assembly slidably disposed between the front and rear brackets. The rear end of the front bracket has an annular portion, the rear edge of which is everted to form a mounting flange that engages between the front and rear pump housings. A valve port is formed in the center of the annular portion. The valve core assembly includes a mounting sleeve, a temperature sensing element disposed within the mounting sleeve, a push rod slidably disposed within the mounting sleeve, a valve plate connected to the front end of the mounting sleeve, and a spring disposed between the rear bracket and the valve plate. The front end of the push rod extends out of the mounting sleeve and abuts against the front bracket, while the rear end abuts against the temperature sensing element. When the temperature rises, the temperature sensing element expands, the push rod pushes out of the mounting sleeve, and the mounting sleeve and valve plate move backward, compressing the spring. The valve plate opens the valve port, connecting chamber one and chamber two. When the temperature drops, under the action of the spring force, the mounting sleeve and valve plate move forward until the valve plate blocks the valve port, disconnecting the connection between chamber one and chamber two.

[0018] In the aforementioned motorcycle engine cooling water pump, a rubber tube is fitted to the rear end of the push rod, and the front end of the rubber tube is fixedly connected to the front end of the mounting sleeve through a sealing seat and the front end of the mounting sleeve is sealed. The sealing seat is provided with a through hole for the push rod to extend out.

[0019] In the aforementioned motorcycle engine cooling water pump, the temperature sensing element is a solid, liquid, or gas.

[0020] The outstanding advantages of this utility model compared to the prior art are:

[0021] 1. This utility model integrates the thermostat into the pump body, and sets the main water inlet channel, small circulation water inlet channel, large circulation water outlet channel, large circulation water inlet channel and pump outlet channel in the pump body. No additional water pipe connection is required. The structure is compact, occupies little space, and has fewer parts, making installation simple and convenient, and the cost is low.

[0022] 2. The rear end of the rear pump housing of this utility model is provided with a mounting boss that mates with the mounting hole on the cylinder head and a mounting platform that mates with the mounting plane on the cylinder head. The main water inlet pipe is inserted into the cylinder head water outlet pipe on the cylinder head. The main water inlet pipe is inserted into the cylinder head water inlet pipe on the cylinder head. The large circulation water outlet pipe is connected to the water inlet of the radiator and the large circulation water inlet pipe is connected to the water outlet of the radiator. The structure is compact and occupies little space. Attached image description:

[0023] Figure 1 This is a three-dimensional representation of the present invention. Figure 1 ;

[0024] Figure 2 This is a three-dimensional representation of the present invention. Figure 2 ;

[0025] Figure 3 This is a cross-sectional view of the present invention;

[0026] Figure 4 This is a cross-sectional view of the present invention from another angle;

[0027] Figure 5 This is a perspective view of the thermostat of this utility model;

[0028] Figure 6 This is a cross-sectional view of the thermostat of this utility model.

[0029] Reference numerals: 1. Pump body; 1a. Front pump casing; 1b. Rear pump casing; 2. Pump chamber; 3. Impeller; 4. Main inlet channel; 5. Mounting chamber; 5a. Chamber 1; 5b. Chamber 2; 6. Small circulation inlet channel; 7. Large circulation outlet channel; 8. Large circulation inlet channel; 9. Pump outlet channel; 10. Thermostat; 10a. Front bracket; 10a1. Annular part; 10a2. Mounting flange; 10b. Rear bracket; 10c. Valve core assembly; 10 c1, Mounting sleeve; 10c2, Temperature sensing element; 10c3, Push rod; 10c4, Valve plate; 10c5, Spring; 10c6, Rubber hose; 10c7, Sealing seat; 11, Large circulation outlet pipe; 12, Large circulation inlet pipe; 13, Main inlet pipe; 14, Pump outlet pipe; 15, Mounting pipe; 16, Temperature sensor; 17, Mounting boss; 18, Pump shaft; 19, Mounting platform; 20, Bearing; 21, Oil seal; 22, Integrated water seal. Detailed implementation method:

[0030] The present invention will be further described below with reference to specific embodiments. See also: Figure 1 —6:

[0031] A motorcycle engine cooling water pump includes a pump body 1, a pump chamber 2 inside the pump body 1, an impeller 3 inside the pump chamber 2, a main water inlet channel 4, an installation cavity 5, a small circulation water inlet channel 6, a large circulation water outlet channel 7, a large circulation water inlet channel 8, and a pump outlet channel 9. A thermostat 10 is installed in the installation cavity 5, dividing the installation cavity 5 into two chambers: chamber 1 5a and chamber 2 5b. The main water inlet channel 4 connects to chamber 1 5a, the small circulation water inlet channel 6 connects chamber 1 5a and the pump chamber 2, the large circulation water outlet channel 7 connects to chamber 2 5b, the large circulation water inlet channel 8 connects to the pump chamber 2, and the pump outlet channel 9 connects to the pump chamber 2. When the temperature does not reach a set value, the thermostat 10 disconnects the connection between chamber 1 5a and chamber 2 5b; when the temperature reaches the set value, the thermostat 10 connects chamber 1 5a and chamber 2 5b.

[0032] The working principle of this utility model is as follows: Figure 1-6 As shown, when the temperature does not reach the set value, the thermostat 10 disconnects the connection between chamber 1 5a and chamber 2 5b. Water flowing in through the main water inlet channel 4 enters the pump chamber 2 through chamber 1 5a and the small circulation water inlet channel 6 to form a small circulation. When the temperature reaches the set value, the thermostat 10 connects chamber 1 5a and chamber 2 5b. Most of the water flowing into chamber 1 5a through the main water inlet channel 4 enters the pump chamber 2 through chamber 2 5b, the large circulation water outlet channel 7, the radiator, and the large circulation water inlet channel 8 to form a large circulation. At the same time, a small portion of the water enters the pump chamber 2 through the small circulation water inlet channel 6.

[0033] This utility model integrates the thermostat into the pump body 1, and sets the main water inlet channel 4, small circulation water inlet channel 6, large circulation water outlet channel 7, large circulation water inlet channel 8 and pump outlet channel 9 in the pump body 1. No additional water pipe connection is required, the structure is compact, occupies little space, and has fewer parts, making installation simple and convenient, and the cost is low.

[0034] The specific structure of pump body 1 is as follows: Figure 1-4 As shown, the pump body 1 includes a front pump housing 1a and a rear pump housing 1b. The pump chamber 2 is formed in the middle of the pump body 1, and the mounting cavity 5 is formed at the upper end. A small circulation water inlet channel 6 is disposed between the front pump housing 1a and the rear pump housing 1b. The front pump housing 1a is provided with a large circulation water outlet pipe 11 at the upper end and a large circulation water inlet pipe 12 in the middle. The inner cavity of the large circulation water outlet pipe 11 is the large circulation water outlet channel 7, and the inner cavity of the large circulation water inlet pipe 12 is the large circulation water inlet channel 8. The rear pump housing 1b is provided with a main water inlet pipe 13 at the upper end and a pump outlet pipe 14 at the lower end. The inner cavity of the main water inlet pipe 13 is the main water inlet channel 4, and the inner cavity of the pump outlet pipe 14 is the pump outlet channel 9.

[0035] To reduce assembly steps and ensure a secure and reliable connection, the large circulation outlet pipe 11, the large circulation inlet pipe 12, and the front pump housing 1a are integrated into one structure, and the main inlet pipe 13, the pump outlet pipe 14, and the rear pump housing 1b are integrated into one structure. The front pump housing 1a and the rear pump housing 1b are fixedly connected by screws.

[0036] In order to detect the temperature of the main water inlet pipe 13 and further improve the integration level, the main water inlet pipe 13 is provided with an installation pipe 15, and a temperature sensor 16 for detecting the water temperature of the main water inlet pipe 13 is installed on the installation pipe 15.

[0037] To further improve the compactness of the motorcycle engine structure of this utility model, the rear end of the rear pump housing 1b is provided with a mounting boss 17 that mates with the mounting hole on the cylinder head. The pump body 1 is rotatably provided with a pump shaft 18 that is coaxial with the mounting boss 17 and has one end protruding from the mounting boss 17. The impeller 3 is fixedly mounted on the pump shaft 18. The rear end of the rear pump housing 1b is provided with a mounting platform 19 that mates with the mounting plane on the cylinder head. The mounting boss 17 is located in the mounting platform 19 for easy installation.

[0038] Drive mechanism of pump shaft 18: The end of pump shaft 18 extending out of mounting boss 17 is connected to the crankshaft of drive valve.

[0039] To prevent leakage, a sealing ring is provided between the mounting platform 19 and the mounting plane on the cylinder head, and a sealing ring is provided between the front pump housing 1a and the rear pump housing 1b.

[0040] The mounting structure of pump shaft 18 is as follows: Figure 4 As shown, the pump shaft 18 is rotatably connected to the mounting boss 17 via two bearings 20. An oil seal 21 is provided between the pump shaft 18 and the mounting boss 17, located in front of the bearings 20. An integrated water seal 22 is provided between the rear pump housing 1b and the pump shaft 18, located in front of the oil seal 21. This utility model adopts double bearing positioning, which has high strength and good durability.

[0041] The installation structure of this utility model for the water pump, cylinder head, and radiator is as follows: the main inlet pipe 13 is inserted into the cylinder head outlet pipe on the cylinder head; the pump outlet pipe 14 is inserted into the cylinder head inlet pipe on the cylinder head; the large circulation outlet pipe 11 is connected to the radiator inlet; and the large circulation inlet pipe 12 is connected to the radiator outlet. The structure is compact and occupies little space. The water flow direction of the large circulation is: cylinder head outlet pipe, main inlet pipe 13, large circulation outlet pipe 11, radiator, and large circulation inlet channel 12 enter the pump chamber 2. The water flow direction of the small circulation is: cylinder head outlet pipe, main inlet pipe 13, and small circulation inlet channel 6 directly enter the pump chamber 2.

[0042] Connection structure between pump body 1 and cylinder head: screws pass through the front pump housing 1a and the rear pump housing 1b in sequence and are screwed to the cylinder head.

[0043] The structure of thermostat 10: as follows Figure 3 , 5 As shown in Figure 6, the thermostat 10 includes a front bracket 10a, a rear bracket 10b mounted on the front bracket 10a at its front end, and a valve core assembly 10c slidably disposed between the front bracket 10a and the rear bracket 10b. The rear end of the front bracket 10a has an annular portion 10a1, the rear edge of which is turned outward to form a mounting flange 10a2 that is engaged between the front pump housing 1a and the rear pump housing 1b. A valve port is formed in the middle of the annular portion 10a1. The valve core assembly 10c includes a mounting sleeve 10c1, a temperature sensing element 10c2 disposed within the mounting sleeve 10c1, a push rod 10c3 slidably disposed within the mounting sleeve 10c1, and a valve plate 10c4 connected to the front end of the mounting sleeve 10c1. A spring 10c5 is installed between the rear bracket 10b and the valve plate 10c4. The front end of the push rod 10c3 extends out of the mounting sleeve 10c1 and abuts against the front bracket 10a, while the rear end abuts against the temperature sensing element 10c2. When the temperature rises, the temperature sensing element 10c2 expands, the push rod 10c3 pushes out of the mounting sleeve 10c1, the mounting sleeve 10c1 and the valve plate 10c4 move backward, compressing the spring 10c5, and the valve plate 10c4 opens the valve port, connecting chamber one 5a and chamber two 5b. When the temperature drops, under the action of the spring force of the spring 10c5, the mounting sleeve 10c1 and the valve plate 10c4 move forward until the valve plate 10c4 blocks the valve port, disconnecting the connection between chamber one 5a and chamber two 5b.

[0044] To prevent the temperature sensing element 10c2 from leaving the mounting sleeve 10c1, a rubber tube 10c6 is fitted onto the rear end of the push rod 10c3. The front end of the rubber tube 10c6 is fixedly connected to the front end of the mounting sleeve 10c1 through a sealing seat 10c7 and blocks the front end of the mounting sleeve 10c1. The sealing seat 10c7 is provided with a through hole for the push rod 10c3 to extend out.

[0045] Preferably, the temperature sensing element 10c2 is a solid, liquid, or gas. In this embodiment, the temperature sensing element 10c2 is solid paraffin wax.

[0046] The above embodiments are only one of the preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes made in accordance with the shape, structure and principle of this utility model should be covered within the protection scope of this utility model.

Claims

1. A motorcycle engine cooling water pump, comprising a pump body (1), wherein the pump body (1) is provided with a pump chamber (2), and an impeller (3) is provided within the pump chamber (2), characterized in that: The pump body (1) is provided with a main water inlet channel (4), an installation cavity (5), a small circulation water inlet channel (6), a large circulation water outlet channel (7), a large circulation water inlet channel (8), and a pump outlet channel (9). A thermostat (10) is installed in the installation cavity (5), which divides the installation cavity (5) into two chambers: chamber one (5a) and chamber two (5b). The main water inlet channel (4) connects to chamber one (5a), and the small circulation water inlet channel (5b) connects to chamber two (5b). Water channel (6) connects chamber one (5a) and pump chamber (2), large circulation water outlet channel (7) connects chamber two (5b), large circulation water inlet channel (8) connects pump chamber (2), pump outlet channel (9) connects pump chamber (2), when the temperature does not reach the set value, thermostat (10) disconnects the connection between chamber one (5a) and chamber two (5b); when the temperature reaches the set value, thermostat (10) connects chamber one (5a) and chamber two (5b).

2. The motorcycle engine cooling water pump according to claim 1, characterized in that: The pump body (1) includes a front pump housing (1a) and a rear pump housing (1b). The pump chamber (2) is formed in the middle of the pump body (1) and the mounting cavity (5) is formed at the upper end. A small circulation water inlet channel (6) is provided between the front pump housing (1a) and the rear pump housing (1b). The front pump housing (1a) is provided with a large circulation water outlet pipe (11) at the upper end and a large circulation water inlet pipe (12) in the middle. The inner cavity of the large circulation water outlet pipe (11) is the large circulation water outlet channel (7), and the inner cavity of the large circulation water inlet pipe (12) is the large circulation water inlet channel (8). The rear pump housing (1b) is provided with a main water inlet pipe (13) at the upper end and a pump outlet pipe (14) at the lower end. The inner cavity of the main water inlet pipe (13) is the main water inlet channel (4), and the inner cavity of the pump outlet pipe (14) is the pump outlet channel (9).

3. A motorcycle engine cooling water pump according to claim 2, characterized in that: The large circulation outlet pipe (11), the large circulation inlet pipe (12) and the front pump housing (1a) are an integral structure, the main inlet pipe (13), the pump outlet pipe (14) and the rear pump housing (1b) are an integral structure, and the front pump housing (1a) and the rear pump housing (1b) are fixedly connected by screws.

4. A motorcycle engine cooling water pump according to claim 2, characterized in that: The main water inlet pipe (13) is provided with an installation pipe (15), and a temperature sensor (16) for detecting the water temperature of the main water inlet pipe (13) is installed on the installation pipe (15).

5. A motorcycle engine cooling water pump according to claim 2, characterized in that: The rear end of the rear pump housing (1b) is provided with a mounting boss (17) that mates with the mounting hole on the cylinder head. The pump body (1) is rotatably provided with a pump shaft (18) that is coaxial with the mounting boss (17) and has one end protruding from the mounting boss (17). The impeller (3) is fixedly mounted on the pump shaft (18). The rear end of the rear pump housing (1b) is provided with a mounting platform (19) that mates with the mounting plane on the cylinder head. The mounting boss (17) is located inside the mounting platform (19).

6. A motorcycle engine cooling water pump according to claim 5, characterized in that: The pump shaft (18) is rotatably connected to the mounting boss (17) via two bearings (20). An oil seal (21) located in front of the bearing (20) is provided between the pump shaft (18) and the mounting boss (17). An integrated water seal (22) located in front of the oil seal (21) is provided between the rear pump housing (1b) and the pump shaft (18).

7. A motorcycle engine cooling water pump according to claim 2, characterized in that: The main water inlet pipe (13) is inserted into the cylinder head outlet pipe on the cylinder head, the pump outlet pipe (14) is inserted into the cylinder head inlet pipe on the cylinder head, the large circulation outlet pipe (11) is connected to the radiator inlet, and the large circulation inlet pipe (12) is connected to the radiator outlet.

8. A motorcycle engine cooling water pump according to claim 2, characterized in that: The thermostat (10) includes a front bracket (10a), a rear bracket (10b) mounted on the front bracket (10a), and a valve core assembly (10c) slidably disposed between the front bracket (10a) and the rear bracket (10b). The rear end of the front bracket (10a) is provided with an annular portion (10a1), the rear edge of which is turned outward to form a mounting flange (10a2) that is engaged between the front pump housing (1a) and the rear pump housing (1b). A valve port is formed in the middle of the annular portion (10a1). The valve core assembly (10c) includes a mounting sleeve (10c1), a temperature sensing element (10c2) disposed in the mounting sleeve (10c1), a push rod (10c3) slidably disposed in the mounting sleeve (10c1), a valve plate (10c4) connected to the front end of the mounting sleeve (10c1), and a valve core assembly (10c4) slidably disposed between the front and rear pump housings (10a1). A spring (10c5) is placed between the rear bracket (10b) and the valve plate (10c4). The front end of the push rod (10c3) extends out of the mounting sleeve (10c1) and abuts against the front bracket (10a), while the rear end abuts against the temperature sensing element (10c2). When the temperature rises, the temperature sensing element (10c2) expands, and the push rod (10c3) pushes out of the mounting sleeve (10c1). The mounting sleeve (10c1) and the valve plate (10c4) move backward, compressing the spring (10c5). The valve plate (10c4) opens the valve port, and chamber one (5a) and chamber two (5b) are connected. When the temperature drops, under the action of the spring force (10c5), the mounting sleeve (10c1) and the valve plate (10c4) move forward until the valve plate (10c4) blocks the valve port, and chamber one (5a) and chamber two (5b) are disconnected.

9. A motorcycle engine cooling water pump according to claim 8, characterized in that: The push rod (10c3) is fitted with a rubber tube (10c6) at its rear end. The front end of the rubber tube (10c6) is fixedly connected to the front end of the mounting sleeve (10c1) through a sealing seat (10c7) and blocks the front end of the mounting sleeve (10c1). The sealing seat (10c7) is provided with a through hole for the push rod (10c3) to extend out.

Images