CN220890281U - Motorcycle engine water pump and camshaft subassembly - Google Patents
Motorcycle engine water pump and camshaft subassembly Download PDFInfo
- Publication number
- CN220890281U CN220890281U CN202322643869.5U CN202322643869U CN220890281U CN 220890281 U CN220890281 U CN 220890281U CN 202322643869 U CN202322643869 U CN 202322643869U CN 220890281 U CN220890281 U CN 220890281U
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- pressure reducing
- reducing valve
- water pump
- shaft
- roller
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 58
- 230000001603 reducing effect Effects 0.000 claims abstract description 83
- 230000007246 mechanism Effects 0.000 claims abstract description 8
- 230000009471 action Effects 0.000 description 6
- 238000009434 installation Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000000110 cooling liquid Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
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- Valve Device For Special Equipments (AREA)
Abstract
The utility model relates to the technical field of motorcycle engines and discloses a water pump and camshaft assembly of a motorcycle engine, which comprises a water pump shaft and a camshaft, wherein a water pump impeller is arranged on the water pump shaft, and a timing chain wheel, an air inlet cam, an air outlet cam and a pressure reducing valve control mechanism are arranged on the camshaft.
Description
Technical Field
The utility model relates to the technical field of motorcycle engines, in particular to a water pump and camshaft assembly of a motorcycle engine.
Background
The engine water pump and the cam shaft are two important parts of the engine, the engine water pump is responsible for circulating cooling liquid, ensuring the normal running temperature of the engine, and the engine water pump and the cam shaft are connected to a crank shaft of the engine through a driving belt or chain; the camshaft is a component for controlling engine valves and is realized by a camshaft with cams on one shaft.
The Chinese patent document CN202370640U discloses a mounting structure of a motorcycle engine water pump, which comprises a water pump shell, wherein an inner cavity is formed in the water pump shell, an impeller and an impeller shaft are mounted in the inner cavity, a water inlet and a water outlet are formed in the water pump shell, the water pump shell is mounted on one side of an engine cylinder head, and one end of the impeller shaft is connected with a cam shaft in the cylinder head and is directly driven to rotate by the cam shaft.
As shown in fig. 6, in the conventional structure, the water pump comprises a water pump impeller, a water pump shaft, a mounting seat and a cam shaft body, wherein the mounting seat is positioned at the end part of the water pump shaft, a flat square is arranged on the mounting seat, and the flat square of the water pump shaft is inserted into a flat square groove of the mounting seat.
This prior art has the following disadvantages: the water pump of the scooter water-cooling engine is normally designed to be driven by a cylinder head camshaft, the camshaft is connected with the water pump through a mounting seat and a flat square, mounting errors can occur after multiple times of assembly, and due to the fact that the flat square of the water pump shaft and a flat square groove of the mounting seat are in unilateral contact when the mounting errors and the manufacturing errors exist, unilateral stress is easy, and the water pump shaft or the mounting seat is broken.
Disclosure of utility model
The utility model provides a water pump and camshaft assembly of a motorcycle engine, which aims to solve the technical problem that the water pump and camshaft assembly cannot be centered after being assembled for many times.
Preferably, the limiting groove is a straight groove, and the limiting piece is a water pump shaft pin.
In order to enable the engine to be started easily, the pressure reducing valve control mechanism comprises a pressure reducing valve throwing block and a pressure reducing valve roller, an exhaust cam side journal is arranged on the cam shaft, a roller hole is formed in the end face side of the exhaust cam side journal, the roller hole is communicated with an arc-shaped groove at the base circle position of the exhaust cam, the pressure reducing valve roller is installed in the roller hole and connected with the arc-shaped groove, a tangent plane is arranged on the pressure reducing valve roller, the pressure reducing valve throwing block is arranged on the exhaust cam side journal and connected with the pressure reducing valve roller, and the pressure reducing valve throwing block centrifugally controls the pressure reducing valve roller to rotate in the roller hole along with the rotation of the cam shaft; the section is thrown out by the relief valve throwing block and leaks in the arc-shaped groove, the outer edge of the shaft neck of the relief valve roller is lower than the outer edge of the base circle of the exhaust cam, the section is hidden in the arc-shaped groove when the relief valve throwing block is not thrown out, and the outer edge of the shaft neck of the relief valve roller is higher than the outer edge of the base circle of the exhaust cam.
In order to facilitate the rotation of the pressure reducing valve roller, the end face of the exhaust cam side shaft neck is provided with a pin shaft hole, the pin shaft hole is in interference fit with a pin shaft, the pin shaft is used for connecting the pressure reducing valve throwing block and a bushing, the bushing is in clearance fit with the pin shaft, a torsion spring is sleeved on the bushing, a pressure reducing valve limiting pin on the pressure reducing valve throwing block is inserted into a strip-shaped groove on the pressure reducing valve roller, one end of the torsion spring is hooked on the pressure reducing valve throwing block, and the other end of the torsion spring is hooked on the exhaust cam side shaft neck.
Preferably, the limiting pin of the pressure reducing valve and the throwing block of the pressure reducing valve are in interference fit into a whole.
In order to facilitate axial positioning, one end of the cam shaft, which is close to the water pump shaft, is provided with a baffle plate and an elastic clamping ring, and a gap is reserved between the baffle plate and the swing block of the pressure reducing valve.
In order to facilitate the installation of the timing sprocket, the end face of the exhaust cam side journal is provided with two threaded holes, and the timing sprocket is fixed on the end face of the exhaust cam side journal by bolts.
The utility model has the following beneficial effects:
1. The application improves the installation precision of the water pump shaft and the cam shaft, the joint is not easy to break, the error in the process of multiple disassembly and assembly is avoided, the service life is prolonged, the reliability of driving the water pump is high, and the installation of the water pump and the cam shaft is simple and convenient.
2. The engine is easy to start: under the action of the torsion spring, the reducing valve swing block keeps the reducing valve roller at a reducing position, namely the outer edge of the shaft neck of the reducing valve roller is higher than the base circle of the exhaust cam, so that the exhaust valve of the engine has a small opening lift, the compression resistance of the piston is reduced, the starting torque is reduced, and the engine is easy to start. When the engine is started successfully, the rotation speed of the cam shaft is increased to enable the pressure reducing valve throwing block to rotate around the pin shaft under the action of centrifugal force, the pressure reducing valve limiting pin on the pressure reducing valve throwing block drives the pressure reducing valve roller to rotate for a certain angle, and after the pressure reducing valve limiting pin rotates for a certain angle, the position of flattening on the outer circle of the pressure reducing valve roller is lower than the base circle of the exhaust cam, so that the pressure reducing effect is lost. When the engine is shut down, the centrifugal force of the throwing block of the pressure reducing valve is lost due to the reduction of the rotating speed, and the throwing block is attributed to the pressure reducing position under the action of the elastic force of the torsion spring.
Drawings
FIG. 1 is a schematic illustration of an embodiment of a motorcycle engine water pump and camshaft assembly of the present utility model;
FIG. 2 is a schematic view of the structure of a camshaft assembly of a motorcycle engine according to the present utility model;
FIG. 3 is a cross-sectional view of FIG. 2;
FIG. 4 is a schematic illustration of a camshaft;
FIG. 5 is a schematic diagram of a timing sprocket;
Fig. 6 is a conventional structure.
Detailed Description
The following is a further detailed description of the embodiments:
1. reference numerals in the drawings of the specification include: the cam shaft 1, the pressure reducing valve roller 2, the pressure reducing valve limiting pin 3, the pressure reducing valve throwing block 4, the baffle 5, the elastic clamping ring 6, the pin shaft 7, the bushing 8, the torsion spring 9, the timing chain wheel 10, the bolt 11, the water pump shaft 12, the water pump shaft pin 13, the water pump impeller 14, the air inlet cam 15, the air outlet cam 16, the air inlet cam side journal 17, the air outlet cam side journal 18, the arc-shaped groove 19, the flat square 20, the mounting seat 21, the roller hole a, the threaded hole b, the pin shaft hole c, the tangential plane d, the straight groove e and the limiting hole f.
Example 1
As shown in fig. 1-5, a motorcycle engine water pump and camshaft subassembly, including water pump shaft 12 and camshaft 1, be equipped with water pump impeller 14 on the water pump shaft 12, be equipped with timing sprocket 10, air intake cam 15, exhaust cam 16 and relief valve control mechanism on the camshaft 1, be close to on the camshaft 1 the tip center of relief valve control mechanism radially is equipped with spacing hole f, is equipped with a word groove e on the terminal surface axially, water pump shaft 12 peg graft in spacing hole f, be equipped with pump pivot pin 13 in the word groove e, pump pivot pin 13 runs through water pump shaft 12 and fixes.
The pressure reducing valve control mechanism comprises a pressure reducing valve throwing block 4 and a pressure reducing valve roller 2, wherein an air inlet cam side journal 17 and an air outlet cam side journal 18 are arranged on the cam shaft 1, a bearing is arranged at the upper part of the air inlet cam side journal 17, a bearing is arranged at the upper part of the air outlet cam side journal 18, a roller hole a is arranged at the end face side of the air outlet cam side journal 18, the depth of the roller hole a is communicated with an arc-shaped groove 19 at the base circle position of the air outlet cam 16, the pressure reducing valve roller 2 is in clearance fit with the pressure reducing valve roller 2 in the roller hole a, the pressure reducing valve roller 2 is connected with the arc-shaped groove 19, a tangent plane d is arranged on the pressure reducing valve roller 2, the pressure reducing valve throwing block 4 is arranged on the air outlet cam side journal 18, the pressure reducing valve throwing block 4 is connected with the pressure reducing valve roller 2, and the pressure reducing valve throwing block 4 rotates along with the cam shaft 1 to centrifugally control the pressure reducing valve roller 2 to rotate in the roller hole a for a certain angle; the tangent plane d is thrown out of the arc-shaped groove 19 by the pressure reducing valve throwing block 4, so that the outer edge of the shaft neck of the pressure reducing valve roller 2 is lower than the outer edge of the base circle of the exhaust cam 16, and the tangent plane d is hidden in the arc-shaped groove 19 by the pressure reducing valve throwing block 4, so that the outer edge of the shaft neck of the pressure reducing valve roller 2 is higher than the outer edge of the base circle of the exhaust cam 16.
The end face of the exhaust cam side journal 18 is provided with a pin hole c, the pin hole c is in interference fit with a pin shaft 7, the pin shaft 7 is used for connecting the pressure reducing valve throwing block 4 and the bushing 8, the bushing 8 is in clearance fit with the pin shaft 7, the bushing 8 is sleeved with a torsion spring 9, the pressure reducing valve limiting pin 3 on the pressure reducing valve throwing block 4 is inserted into a strip-shaped groove on the pressure reducing valve roller 2, the pressure reducing valve limiting pin 3 and the pressure reducing valve throwing block 4 are integrally assembled in interference fit, one end of the torsion spring 9 is hooked on the pressure reducing valve throwing block 4, and the other end of the torsion spring 9 is hooked on the exhaust cam side journal 18.
The camshaft 1 is provided with a baffle plate 5 and an elastic clamping ring 6 at one end close to the water pump shaft 12, and a gap is reserved between the baffle plate 5 and the pressure reducing valve swing block 4.
The end face of the exhaust cam side journal 18 is provided with two screw holes b, and the timing sprocket 10 is fixed to the end face of the exhaust cam side journal 18 by bolts 11.
When the engine is started, a timing chain is driven by an engine crankshaft, the timing chain drives a timing chain wheel 10 to rotate so as to drive a cam shaft 1 to rotate, when the rotating speed of the cam shaft 1 does not reach to throw a relief valve throwing block 4, the relief valve throwing block 4 keeps a relief valve roller 2 at a relief position under the action of a torsion spring 9, and the relief position is that the outer edge of a shaft neck of the relief valve roller 2 is higher than the outer edge of a base circle of an exhaust cam 16, so that an engine exhaust valve has a small opening lift, compression resistance of a piston is reduced, starting torque is reduced, and the engine is easy to start; when the engine is started successfully, the rotation speed of the cam shaft 1 is increased, so that the pressure reducing valve throwing block 4 rotates around the pin shaft 7 under the action of centrifugal force, the pressure reducing valve limiting pin 3 on the pressure reducing valve throwing block 4 drives the pressure reducing valve roller 2 to rotate for a certain angle, and after the pressure reducing valve limiting pin rotates for a certain angle, the flattening position on the outer circle of the pressure reducing valve roller 2 is lower than the base circle of the exhaust cam 16, and the pressure reducing effect is lost. When the engine is shut down, the centrifugal force of the relief valve throwing block 4 is lost due to the reduction of the rotation speed and is returned to the relief position under the action of the elastic force of the torsion spring 9.
The foregoing is merely an embodiment of the present utility model, and a specific structure and characteristics of common knowledge in the art, which are well known in the scheme, are not described herein, so that a person of ordinary skill in the art knows all the prior art in the application date or before the priority date, can know all the prior art in the field, and has the capability of applying the conventional experimental means before the date, and a person of ordinary skill in the art can complete and implement the present embodiment in combination with his own capability in the light of the present utility model, and some typical known structures or known methods should not be an obstacle for a person of ordinary skill in the art to implement the present utility model. It should be noted that modifications and improvements can be made by those skilled in the art without departing from the structure of the present utility model, and these should also be considered as the scope of the present utility model, which does not affect the effect of the implementation of the present utility model and the utility of the patent. The protection scope of the present utility model is subject to the content of the claims, and the description of the specific embodiments and the like in the specification can be used for explaining the content of the claims.
Claims (7)
1. The utility model provides a motorcycle engine water pump and camshaft subassembly, includes water pump shaft and camshaft, be equipped with the water pump impeller on the water pump shaft, be equipped with timing sprocket, intake cam, exhaust cam and relief pressure valve control mechanism on the camshaft, its characterized in that, be close to on the camshaft the tip of relief pressure valve control mechanism radially is equipped with spacing hole, is equipped with the spacing groove on the terminal surface axially, the water pump shaft is pegged graft in spacing downthehole, be equipped with the locating part in the spacing groove, the locating part runs through the water pump shaft is fixed.
2. The motorcycle engine water pump and camshaft assembly of claim 1, wherein: the limiting groove is a straight groove, and the limiting piece is a water pump shaft pin.
3. A motorcycle engine water pump and camshaft assembly as claimed in claim 1 or 2, wherein: the pressure reducing valve control mechanism comprises a pressure reducing valve throwing block and a pressure reducing valve roller, an exhaust cam side journal is arranged on the cam shaft, a roller hole is formed in the end face side of the exhaust cam side journal, the roller hole is communicated with an arc groove at the base circle position of the exhaust cam, the pressure reducing valve roller is arranged in the roller hole and connected with the arc groove, a tangent plane is formed on the pressure reducing valve roller, the pressure reducing valve throwing block is arranged on the exhaust cam side journal and connected with the pressure reducing valve roller, and the pressure reducing valve throwing block centrifugally controls the pressure reducing valve roller to rotate in the roller hole along with the rotation of the cam shaft; the section is thrown out by the relief valve throwing block and leaks in the arc-shaped groove, the outer edge of the shaft neck of the relief valve roller is lower than the outer edge of the base circle of the exhaust cam, the section is hidden in the arc-shaped groove when the relief valve throwing block is not thrown out, and the outer edge of the shaft neck of the relief valve roller is higher than the outer edge of the base circle of the exhaust cam.
4. A motorcycle engine water pump and camshaft assembly as claimed in claim 3, wherein: the end face of the exhaust cam side shaft neck is provided with a pin shaft hole, the pin shaft hole is in interference fit with a pin shaft, the pin shaft is used for connecting the pressure reducing valve throwing block and the bushing, the bushing is in clearance fit with the pin shaft, a torsion spring is sleeved on the bushing, a pressure reducing valve limiting pin on the pressure reducing valve throwing block is inserted into a strip-shaped groove on the pressure reducing valve roller, one end of the torsion spring is hooked on the pressure reducing valve throwing block, and the other end of the torsion spring is hooked on the exhaust cam side shaft neck.
5. The motorcycle engine water pump and camshaft assembly of claim 4, wherein: the limiting pin of the pressure reducing valve and the throwing block of the pressure reducing valve are assembled into a whole in an interference fit manner.
6. A motorcycle engine water pump and camshaft assembly as claimed in claim 4 or 5, wherein: and a baffle and an elastic clamping ring are arranged at one end, close to the water pump shaft, of the cam shaft, and a gap is reserved between the baffle and the throwing block of the pressure reducing valve.
7. The motorcycle engine water pump and camshaft assembly of claim 6, wherein: the end face of the exhaust cam side journal is provided with two threaded holes, and the timing sprocket is fixed on the end face of the exhaust cam side journal through bolts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322643869.5U CN220890281U (en) | 2023-09-28 | 2023-09-28 | Motorcycle engine water pump and camshaft subassembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322643869.5U CN220890281U (en) | 2023-09-28 | 2023-09-28 | Motorcycle engine water pump and camshaft subassembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220890281U true CN220890281U (en) | 2024-05-03 |
Family
ID=90876878
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322643869.5U Active CN220890281U (en) | 2023-09-28 | 2023-09-28 | Motorcycle engine water pump and camshaft subassembly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220890281U (en) |
-
2023
- 2023-09-28 CN CN202322643869.5U patent/CN220890281U/en active Active
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| GR01 | Patent grant | ||
| GR01 | Patent grant |