JP2797074B2 - Engine oil pump device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil pump device for a propulsion engine of a personal watercraft, for example, and more particularly to an oil pump device provided with means for absorbing radial deflection of an end of a crankshaft. It is.

[0002]

2. Description of the Related Art Generally, lubricating oil is circulated by an oil pump device in order to smoothly slide an engine piston and a crankshaft. In the propulsion engine for the personal watercraft described above, as shown in FIG.
And the drive shaft 17a 'of the oil pump device 17'.
The end and the tip of the crankshaft 3 are connected via an uneven fitting portion (such as a dog clutch) 31, and the oil pump device 17 ′ is driven by using the rotational force of the crankshaft 3. An oil pump device having such a structure is described in Japanese Utility Model Publication No. Sho 63-49528.

In the case of the above-described engine (FIG. 5), a flywheel 5 'is attached to the tip of the crankshaft 3, and the flywheel 5' also serves as a generator and a starter gear.

[0004]

The conventional oil pump device described above has room for improvement in the following points.

[0005] That is, when the crankshaft rotates, the tip may sway in the radial direction. When such a phenomenon occurs, the torque is not smoothly transmitted to the drive shaft of the oil pump device. Also, a rattling noise is generated at the uneven fitting portion between the shafts.

[0006] In particular, when a flywheel is provided at the tip of the crankshaft, the run-out immediately after the start of rotation is large, noise is liable to be generated, and the drive shaft of the oil pump device is rattled. Noise may increase.

[0007] The present invention has been made in view of the above points, and even when the end of the crankshaft runs out,
It is an object of the present invention to provide an oil pump device for an engine in which the oil pump device is smoothly driven, noise such as rattling noise is less likely to be generated, and the life is extended.

[0008]

In order to achieve the above object, an oil pump device for an engine according to the present invention comprises: a) a flywheel attached to one end of a crankshaft of an engine, and an oil pump attached to one end of the crankshaft. In an oil pump device for an engine, wherein one end of a drive shaft of the device is connected via an uneven fitting portion, b) an intermediate shaft between one end of the crankshaft and one end of the drive shaft via an uneven fitting portion, respectively. And c) bearing the intermediate shaft
Around the metal race of this bearing
The metal ring is fixed to the outer circumference of the rubber ring
The elastic ring damper
In addition, the intermediate shaft is supported by the engine main body so as to be rotatable and to allow movement in the radial direction.

According to a second aspect of the present invention, d) a plurality of the bearings and the elastic ring type dampers may be provided in the axial direction of the intermediate shaft.

According to a third aspect of the present invention, e) the uneven fitting portion at one end of the intermediate shaft with respect to the crankshaft and the uneven fitting portion at the other end of the intermediate shaft with respect to the drive shaft are 90 ° in the circumferential direction. It is even better to shift the phase.

According to the oil pump device of the present invention having the above-described structure, during operation of the engine, the rotation of the crankshaft is transmitted to the intermediate shaft through the concave-convex fitting portion, and further, the rotation of the crankshaft from the intermediate shaft is performed. The driving force is transmitted to the drive shaft of the oil pump device via the oil pump device, and the oil pump device is driven. If there is no run-out at the end of the crankshaft, or if a run-out in the radial direction occurs at the end of the crankshaft, the run-out is transmitted to the intermediate shaft. The ring type damper absorbs the radial runout of the intermediate shaft (the axial runout is absorbed by the concave / convex fitting portion), and the runout is hardly transmitted to the drive shaft of the oil pump device, so that the oil pump device can be smoothly run. Is driven. Therefore, almost no noise such as rattling noise is generated.

According to the second aspect of the invention, since the radial vibration of the intermediate shaft is absorbed by the plurality of elastic ring type dampers, the vibration of the intermediate shaft is further reduced, and the noise is further reduced. Is planned.

According to the oil pump device of the third aspect, the intermediate shaft that connects the drive shaft and the crankshaft via the concave and convex fitting portion performs the same operation as the so-called Oldham coupling. Is reduced and the run-out is absorbed at the same time. As a result, the play is reduced and the generation of abnormal noise is further reduced.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an oil pump device for an engine according to the present invention will be described below with reference to the drawings.

FIG. 1 is a longitudinal sectional view of a three-cylinder two-stroke engine provided with an oil pump device according to the present embodiment, FIG. 2 is a transverse sectional view of a portion of the oil pump device of FIG. 1, and FIG.
FIG. 3 is a view taken along line III-III of FIG.

As shown in FIG. 1, the engine 1 has three cylinders 2
A cycle engine, which in this example is mounted in the engine room of the personal watercraft along the longitudinal direction. In a crankcase 2 which is a part of the body of the engine 1, a crankshaft 3 is connected in series via a crankpin 4a to a lower end of a connecting rod 4 having an upper end connected to the piston of each of the cylinders 1A to 1C. I have.

The outer diameter of the distal end (bow side) of the crankshaft 3 gradually decreases in a conical shape toward the distal end, and a flywheel 5 is fastened to this distal end by screws 6. The flywheel 5 is provided with a drive gear 7a of the starter 7 as shown in FIG.
As well as a starter gear that can mesh with the motor, the generator also functions as described later.

As shown in FIG. 1, the distal end side of the crankcase 2 is formed in a casing 8 which extends in a cylindrical shape toward the distal end and has an open distal end, and a generator cover 9 is attached to the opening. A through hole 9a is formed in the center of the generator cover 9, and an annular magnet coil 10 is attached to the inside of the generator cover 9 with bolts 10a. As shown in FIG. 2, the through-hole 9a is composed of a two-stage hole having a large diameter and a small diameter from the inside to the outside. The intermediate shaft 12 is rotatably supported by a bearing 13, and a rubber ring 14 is provided around a metal race 13 a of the bearing 13.
An elastic ring type damper 14 in which a metal ring 14b is integrally fixed to an outer periphery of the through hole 9a is integrally fixed.
Is fixed via a retaining ring 15 to the large-diameter portion.
The rear end of the intermediate shaft 12 is formed as a convex tooth, is fitted into a concave portion formed at the head of the screw 6, and the dog clutch 1
6 is constituted. The tip of the intermediate shaft 12 is formed in a concave portion.

An oil pump device 17 is attached to the outside center of the generator cover 9 with bolts 18. The oil pump device 17 has a rotatable drive shaft 17a. The tip of the drive shaft 17a is formed as a convex tooth and is fitted into the concave portion at the tip of the intermediate shaft 12, and both of them are connected to the dog clutch 1
9. A part of the drive shaft 17a is a worm gear 17
The worm gear 17b meshes with a worm wheel 17c, and a plunger (not shown) is reciprocated by a cam rotor (not shown) integrated with the worm wheel 17c. In FIG. 3, reference numeral 17d denotes a lubricating oil suction port, and lubricating oil sucked into the oil pump device 17 is sent to three cylinders 1A to 1C of the engine 1 via lubricating oil supply hoses 20 to 22, respectively. . In addition,
3 is an air intake chamber, 24 is a vaporizer, 2
5 is an intake manifold, 26 is an exhaust manifold. Reference numeral 27 in FIG. 2 is a lead wire of the generator.

The operation of the oil pump device according to the present embodiment having the above-described configuration will be described. When the engine 1 is operated, the crankshaft 3 rotates, and this rotation (force) is transmitted to the intermediate shaft 12 via the dog clutch 16. Transmitted from the intermediate shaft 12 via the dog clutch 19 to the drive shaft 1
7a, and the oil pump device 17 is driven. At this time, when the distal end of the crankshaft 3 vibrates in the radial direction, the vibration is transmitted to the intermediate shaft 12 and the rear end side of the intermediate shaft 12 vibrates, but the elastic ring type damper 14 supporting the intermediate shaft 12 vibrates. , Vibration is reduced or eliminated on the tip side of the intermediate shaft 12. Thus, the vibration of the crankshaft 3 is hardly transmitted to the drive shaft 17a, and only the rotational force is transmitted. Therefore, the drive shaft 17a rotates smoothly, and lubricating oil is supplied from the oil pump device 17 to each of the cylinders 1A to 1C (FIG. 1).
Sent to In addition, since the vibration is absorbed by the intermediate shaft 12, the torque transmission between the dog clutches 19 and 16 is smoothly performed, and the noise is reduced.

FIG. 4 shows another embodiment of the oil pump device according to the present invention. As shown in FIG. 4, in this embodiment, one end of the intermediate shaft 12 with respect to the concave fitting portion 16a at one end of the crankshaft 3 is shown. And the concave fitting portion 19b at the other end of the intermediate shaft 12 with respect to the convex fitting portion 19a at one end of the drive shaft 17a is shifted in phase by 90 ° in the circumferential direction. Thereby, the same operation and effect as the Oldham coupling can be expected. Other configurations are common to the oil pump device according to the first embodiment.

Although the two embodiments of the oil pump device according to the present invention have been described above, the oil pump device according to the present invention can be implemented as follows.

By arranging a plurality of bearings 13 and elastic ring type dampers 14 for supporting the intermediate shaft 12 in the axial direction of the intermediate shaft 12, it is possible to further enhance the reduction of the runout of the intermediate shaft 12.

The present invention can be applied not only to the engine of the personal watercraft, but also to an oil pump device of various general-purpose engines.

The crankshaft 3 and the drive shaft 17
The connection means (concavo-convex fitting portion) between the a and the intermediate shaft 12 is not limited to the dog clutches 16 and 19 as long as it allows the axial and radial movements to some extent.

The present invention is also applicable to a single cylinder, four-stroke engine.

[0027]

As is apparent from the above description,
The engine oil pump device of the present invention has the following excellent effects. In other words, even when a runout occurs at the connection side end of the crankshaft, the elastic ring type damper absorbs the runout in the radial direction of the intermediate shaft and almost no runout is transmitted to the drive shaft of the oil pump device. The pump device is driven smoothly. Therefore, noise such as rattling is hardly generated, and the operation of the oil pump device is performed smoothly, so that the life of the oil pump device is extended. This is particularly effective in the case of an engine having a flywheel on a crankshaft, in which the run-out tends to increase at the start of operation of the engine.

In the oil pump device according to the second aspect, the plurality of elastic ring dampers absorb the radial vibration of the intermediate shaft, the vibration of the intermediate shaft is further reduced, and the effect of reducing noise is further improved.

In the oil pump device according to the third aspect, since the intermediate shaft operates in the same manner as the Oldham coupling, the wear of each fitting portion is reduced and the run-out is absorbed at the same time. As a result, play is reduced. Thus, the generation of abnormal noise is further reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a three-cylinder two-stroke engine provided with an oil pump device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a portion of the oil pump device of FIG.

FIG. 3 is a view taken along line III-III of FIG. 1;

FIG. 4 is a perspective view showing another embodiment of the oil pump device of the present invention, in which a concave and convex fitting portion between a drive shaft, a crankshaft, and an intermediate shaft is separated.

FIG. 5 is a cross-sectional view corresponding to FIG. 2, showing a portion of a conventional oil pump device.

[Explanation of symbols]

 Reference Signs List 1 engine 2 crankcase 3 crankshaft 5 flywheel 6 screw 9 generator cover 9a through hole 10 magnet coil 12 intermediate shaft 13 bearing 14 elastic ring damper 16/19 dog clutch 17 oil pump device 17a drive shaft

Claims (3)

(57) [Claims] 1. An oil pump device for an engine, wherein a flywheel is attached to one end of a crankshaft of the engine, and one end of a drive shaft of the oil pump device is connected to one end of the crankshaft via an uneven fitting portion. An intermediate shaft is interposed between one end of the crankshaft and one end of the drive shaft via an uneven fitting portion, and the intermediate shaft is rotatably supported by a bearing.
A metal ring around the rubber ring around the race
Elastic ring damper fixed integrally
An oil pump device for an engine , wherein the intermediate shaft is rotatably supported on the engine body so as to be rotatable and radially movable. 2. The engine oil pump device according to claim 1, wherein a plurality of said bearings and said elastic ring type dampers are provided in an axial direction of said intermediate shaft. 3. A phase difference between the uneven fitting portion at one end of the intermediate shaft with respect to the crankshaft and the uneven fitting portion at the other end of the intermediate shaft with respect to the drive shaft is shifted by 90 ° in the circumferential direction. 3. The oil pump device for an engine according to 2.