JPH0138244Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a drive device for a vehicle oil pump.

[Conventional technology]

As seen in motorcycles and tricycles,
When starting an engine using a kick mechanism, the oil pump that pumps oil into the engine's gliding system is usually operated by a gear attached to the crankshaft. There is.

For example, Japanese Patent Application Laid-open No. 58-50357 discloses that a power transmission mechanism such as a clutch mechanism or a transmission mechanism is provided on one side of the crankshaft of an engine started by a crankshaft, and a power transmission mechanism such as a generator is provided on the other side. A gear that meshes with the dry gear of the oil pump is provided on the crankshaft near the generator, and the rotation of the crankshaft is transmitted to the dry gear of the oil pump via the gear to drive the oil pump. A power transmission system for a three-wheeled motor vehicle is disclosed.

[The problem that the idea aims to solve]

Therefore, if the dry gear of the oil pump is configured to mesh with the gear provided on the crankshaft, the span of the crankshaft will become longer, and the space required to store the gear provided on the crankshaft and the dry gear of the oil pump will become longer. This resulted in the inconvenience of making the engine larger.

In view of these points, the present invention provides a vehicle oil pump drive device that makes it possible to make the entire engine more compact and to reduce the diameter of the drive shaft of the oil pump, making it easy to arrange the drive shaft. The purpose is to provide the following.

[Means to solve the problem]

The present invention provides a crankshaft for an engine that is started by a crankshaft, in which a power transmission mechanism such as a clutch mechanism or a transmission mechanism is disposed on one side, and auxiliary equipment such as a generator is disposed on the other side. A shaft is disposed parallel to the crankshaft, a countershaft is disposed parallel to the crankshaft and the crankshaft, and a small gear meshing with a large gear of the crankshaft and a crankshaft are attached to the countershaft. A large gear meshing with a small gear is provided, a worm is provided on the auxiliary equipment side of the countershaft, and a dry gear of an oil pump is meshed orthogonally to the worm.

〔Example〕

Hereinafter, an embodiment in which the present invention is applied to a rear wheel unilateral drive type motor tricycle equipped with a two-stroke engine will be described with reference to the drawings.

FIG. 1 is a side view showing the external appearance of the vehicle, which includes a front body 5 equipped with a steering wheel 1, front wheels 2, a step floor 3, a seat 4, etc., a power unit 6, and a pair of left and right rear wheels 7. , 7', etc., are connected via a joint mechanism 9 so that the front body 5 can bank left and right with respect to the rear body 8 during cornering, and the rear body 8 can swing up and down. There is.

2 to 4 are a side view, a plan view, and a front view showing the appearance of the rear vehicle body 8 with the rear wheels 7, 7' removed, and the power unit 6 is connected to the joint mechanism 9 at the front part thereof. Connecting arm 10 to be connected
and cylinder portions 11 are located at the rear, respectively, and are attached between the rear wheels 7, 7'. Further, a kick shaft 44 protrudes leftward from the front side wall of the left crankcase 16.

The power unit 6 is connected to the left and right crankcases 1.
6, 29, left and right crankcase covers 42, 3
3 and a shroud 66.

The power unit 6, as shown in FIG.
The engine section 6a, a power transmission mechanism including a crank mechanism 38, a transmission mechanism 39, etc. disposed on one side of the crankshaft 14, and the crankshaft 14.
It is made up of auxiliary equipment around the engine, including a generator 19 and a cooling fan 22, which are disposed on the other side of the engine.

The mechanism of the power unit 6 will be explained based on the sectional view of FIG. 5. The crankshaft 14, which is rotated via the connecting rod 13 by the vertical movement of the piston 12, is connected to the left and right shafts 14b via the crank pin 14a. , 14c, and a connecting rod 13 is connected to the crank pin 14a via a metal 15.

The left shaft 14b is supported by the left crankcase 16 via a bearing 17, and at the end of the left shaft 14b that extends outward from the crankcase 16, there is an outer 19a of a generator 19, which has a magnet 18 installed inside. A cooling fan 22 is attached to the outer 19a of the generator 19 with bolts 23, and is fixed to the left crankcase 16 by rotation of the crankshaft 14. Power generation by electromagnetic induction in the coil 19b and cylinder part 1
1 forced air cooling is performed. Note that 24 is a fin provided on the cylinder block 25, 26 is a plug provided on the cylinder head 27 and faces the combustion chamber of the cylinder portion 11, and 28 is a scavenging port.

On the other hand, a right shaft 14c is supported by a right crankcase 29 in which the connecting arm 10 is integrally formed via a ball bearing 30, and a hollow portion 31 is formed along the axis of the right shaft 14c. ing. 32 is a seal for preventing the mixed gas from blowing through the hollow portion 31.

A right crankcase cover 33 is fixed to the right crankcase 29 and covers the outside of the right crankcase. One end of an axle 34, which is a final shaft to which the right rear wheel 7, which is a driving wheel, is attached, is supported by the right crankcase cover 33 via a ball bearing 35, and the other end is supported by a needle to reduce sliding resistance. It is rotatably fitted into the hollow portion 31 of the right shaft 14c via a bearing 36. That is, the axle 34 is supported by the bearing 35 and the bearing 3 in the hollow part 31 of the crankshaft 14 supported by the bearing 30.
6, and is configured to be located on the same axis as the crankshaft 14. 37
is a right brake drum provided on the right rear wheel 7, and an expandable brake shoe (not shown) is disposed inside thereof.

Further, a power transmission mechanism consisting of a clutch mechanism 38 and a transmission mechanism 39 is provided inside the right crankcase cover 33. This clutch mechanism 38
is a clutch plate 38a having a clutch shoe 38e fixed to the end of the right shaft 14c.
and a needle bearing 38c on the outer periphery of the axle 34.
The boss 38d is rotatably supported by a clutch outer 38b. Further, the transmission mechanism 39 includes a countershaft 39b whose one end is rotatably provided on the right crankcase cover 33, a gear 39b that rotates integrally with the clutch outer 38b, and a countershaft 39a.
It is composed of gears 39c and 39d fixed to the axle 34, and a gear 39e fixed to the axle 34.
b meshes with gear 39c, gear 39d meshes with gear 39
It meshes with e. The axle 34 is rotated by the driving force transmitted from the crankshaft 14 via the crank mechanism 38 and the transmission mechanism 39. The other end of the countershaft 39a is supported by the other end of a plate 41 whose base end is fixed to the right crankcase cover 33 with bolts 40.

A left crankcase cover 42 is fixed to the left crankcase 16, and the left crankcase cover 42 covers the cooling fan 22, and the cover 42 and the shroud 66 form a cylinder cooling passage 67.
is formed. Further, the left crankcase cover 42 is provided with an air suction port 65.

Also, approximately on the extension line of the rotation center of the cooling fan 22 of the left crankcase cover 42 is an axle 43 to which the left rear wheel 7', which is a non-driving wheel to which the driving force of the power unit 6 is not transmitted, is attached to the end. , bearing 4 provided in bearing support parts 45, 51
It is rotatably supported via 6 and 47. A snap spring 48 for preventing the bearing from coming off is fitted on the outside of the bearing 46 on the left rear wheel 7' side.
On the other hand, a labyrinth plate 49 is fastened to the inner end of the axle 43 with a nut 50. 52
is the left brake drum installed on the left rear wheel 7'.
An expandable brake shoe is installed inside.

The axis A of the axle 43 of the left rear wheel 7', which is the non-driving wheel, is perpendicular to the vehicle body center line B, but the axis C of the axle 34 of the right rear wheel 7, which is the driving wheel, is perpendicular to the vehicle body center line B. 7a is arranged so that it is not orthogonal to the car body center line B, but is tilted slightly toward the front of the car body. Therefore, the cylinder axis D, which is orthogonal to the axis C, is aligned with the car body center line B at the front of the car body. It is slightly tilted so that they intersect. This inclination of the axle 34 ensures the straightness of both wheels when the rear wheels are driven on one side.

A bracket 53 formed on the left crankcase cover 42 has a kick shaft 44 for starting the engine.
One end of the crankshaft 44 is rotatably supported, and the other end of the crankshaft 44 passes through the left crankcase 16 and is rotatably supported by the right crankcase 29, and the crankshaft 44 is disposed parallel to the crankshaft 14. has been done. Further, a countershaft 57 is disposed between the crankshaft 44 and the crankshaft 14 in parallel thereto, and the countershaft 57 has the following features:
Both ends thereof are rotatably supported by left and right crankcases 16, 29.

A quick threaded portion 54 is formed on the outer periphery of the crankshaft 44 located between both crankcases 16 and 29, and the plunge gear 5 is screwed into the quick threaded portion 54.
5 is configured to mesh with a large gear 56 that is loosely fitted on the lock shaft 44. This large gear 56
is the small gear 5 fixed to the counter shaft 57.
A large gear 59, which is also fixed to the countershaft 57, meshes with a small gear 60 which is fixed to the right shaft 14c of the crankshaft 14. Therefore, when the jack shaft 44 rotates, the plunge gear 55 meshes with the large gear 56 of the jack shaft 44 to rotate the large gear 56, and the rotation of the large gear 56 is transmitted to the countershaft 57 via the small gear 58. Furthermore, the increased speed is transmitted to the crankshaft 14 via the large gear 59 and the small gear 60, thereby prompting the engine to start. 61 is a return spring for the plunge gear 55, and 62 is a return spring for the kick shaft 44.

In addition, on the auxiliary equipment side of the countershaft 57,
A worm 63 is provided, and the worm 63 includes:
An oil pump drive shaft 6 disposed in the space between the kick shaft 44 and the counter shaft 57
Drive gears 64 provided at 4a mesh orthogonally.

Therefore, when the engine starts, the rotation of the crankshaft 14 is decelerated through the small gear 60 and the large gear 59 and transmitted to the countershaft 57.
When the countershaft 57 continues to rotate, the rotation of the worm 63 drives the dry gear 64 of the oil pump at a further reduced speed, thereby pumping oil to the lubricated parts.

It goes without saying that the present invention is similarly applicable to all other engines that are started by a kick mechanism.

[Effect of idea]

As described above, the present invention provides a power transmission mechanism such as a clutch mechanism and a transmission mechanism on one side of the crankshaft of an engine that is started by a crankshaft.
On the other hand, in a vehicle in which auxiliary equipment such as a generator is arranged, a crankshaft is arranged parallel to the crankshaft, and a countershaft is arranged parallel to the crankshaft and the crankshaft. A small gear that meshes with the large gear of the crankshaft and a large gear that meshes with the small gear of the crankshaft are provided on the countershaft, and a worm is provided on the auxiliary equipment side of the countershaft, and the oil pump is driven perpendicularly to the worm. Since the gears are meshed, there is no need to attach a separate gear to the crankshaft to drive the oil pump, and the span of the crankshaft can be shortened, making it possible to make the entire engine more compact. In addition, since the oil pump drive gear is arranged to mesh with the worm of the countershaft, which is driven by the crankshaft at a reduced speed, the diameter of the oil pump drive shaft can be reduced, and the oil pump is driven By reducing the diameter of the oil pump shaft, it is possible to place the oil pump drive gear in the small space between the three axes: the crankshaft, countershaft, and jack shaft, making it easy to arrange the oil pump drive shaft. . Furthermore, when starting the engine, a certain degree of deceleration is required from the crankshaft to the crankshaft, but by forming a small gear on the crankshaft that meshes with the large gear on the crankshaft, the necessary speed increase can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a side view showing the appearance of a rear wheel unilateral drive vehicle to which an embodiment of the present invention is applied, and FIGS.
The figures show the external appearance of the rear vehicle body; FIG. 2 is a side view, FIG. 3 is a plan view, FIG. 4 is a front view, and FIG. 5 is a sectional view of the power unit. 6a...Engine section, 14...Crankshaft, 19...Generator, 38...Crank mechanism, 39...Transmission mechanism, 44...Kitshaft, 54
... Quick screw part, 55 ... Jump gear, 56 ... Large gear, 57 ... Counter shaft, 58 ... Small gear, 59 ... Large gear, 60 ... Small gear, 63 ...
Worm, 64... Drive gear, 64a... Drive shaft.

Claims (1)

[Scope of utility model registration request] In a vehicle where a power transmission mechanism such as a clutch mechanism or a transmission mechanism is installed on one side of the crankshaft of an engine that is started by a crankshaft, and auxiliary equipment such as a generator is installed on the other side, the engine is started by a crankshaft. A countershaft is disposed parallel to the crankshaft and the crankshaft, and a small gear meshing with a large gear of the crankshaft and a small gear of the crankshaft are arranged on the countershaft. In addition to providing meshing large gears, a worm is provided on the auxiliary equipment side of the countershaft.
A drive device for an oil pump for a vehicle, characterized in that a dry gear of the oil pump is engaged with the worm orthogonally.