JPH0441204Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to an engine oil pump drive device for supplying lubricating oil to various parts of an engine.

[Technical background of the invention and its problems]

In an engine, an oil pump that supplies lubricating oil to the sliding surfaces of various parts is driven in conjunction with appropriate locations in the engine transmission system. FIG. 2 shows a unit swing type engine for a two-wheeled motor vehicle, and is an example of an engine in which an oil pump is directly connected to the end of the crankshaft. That is, a drive V-pulley 2 of a V-belt automatic transmission is mounted on one end of the crankshaft 1, and rotation is transmitted via a V-belt 5 to a driven V-pulley 4 mounted on a driven shaft 3. The driven shaft 3 receives rotation from the driven V pulley 4 via a centrifugal shoe starting clutch 6, and further drives an output shaft 8 via a reduction gear mechanism 7. The transmission system is housed in a swing case 10 connected to the crankcase 9 and a cover 11 attached to the swing case 10.

An oil pump housing 12 is recessed in the outer surface of the cover 11 facing one end of the crankshaft 1, and an oil pump 13 is housed therein. oil pump 13
The tip of the input shaft 14 is formed into a joint shaft 14a having a non-circular cross section, and is driven by being connected to a joint hole 15 of the same shape at one end of the crankshaft 1. 16
indicates a cap that seals the oil pump housing 12.

In addition, the oil pump housing 12 (cover 1
One end of the crankshaft 1 is pivotally supported by a bearing 17 held at 1). This is because the crankshaft 1 is long and the load is applied by the drive V pulley 2, etc., so it eliminates the anxiety of being in a cantilevered state and prevents an increase in the shaft diameter and the resulting increase in size and weight of each part. is valid.

However, vibrations caused by the runout of one end of the crankshaft 1 are transmitted directly to the cover 11 via the bearing 17.
Resonance can cause loud noise. Further, if there is a gap between the bearing 17 and one end of the crankshaft 1, there is a problem that fretting corrosion increases due to runout. Therefore, bearing 1
7 can be made floating, or crankshaft 1 and bearing 17
Some have an elastic body interposed between them. This has the effect of reducing the resonance noise of the cover 11, but
The vibration at one end of the crankshaft 1 is absorbed by the oil pump input shaft, which increases wear on the joint, and also causes another problem in that a large force is applied to the input shaft bearing, causing the oil pump 13 to be easily damaged. This would have caused problems.

[Purpose of invention]

In view of the above-mentioned problems, this idea was developed to suppress noise by making it difficult for the vibration of the crankshaft tip to be transmitted to the case cover etc. in a device that drives the oil pump directly from the tip of the crankshaft.
The purpose is to reduce the relative vibration between the tip of the crankshaft and the oil pump input shaft to prevent joint wear and damage to the oil pump.

[Summary of the idea]

In order to achieve the above object, this invention provides an oil pump housing whose bottom part is orthogonal to the axis of the crankshaft in a transmission case that surrounds the outside of one end of the crankshaft. In an oil pump in which the input shaft of the oil pump is aligned and joined to the crankshaft, a cylindrical pump mounting member surrounding the outer circumference of one end of the crankshaft is attached to the bottom of the oil pump housing and is swingable via an elastic body. The oil pump is mounted on the pump mounting member, and a bearing supporting one end of the crankshaft is fixed thereto.

[Example of idea]

FIG. 1 is a cross-sectional view of a part of the crankshaft and transmission system of a unit swing type engine for a two-wheeled motor vehicle showing an embodiment of this invention.

One end of the crankshaft 1 protrudes into a transmission case, and a drive V pulley 2 of a V-belt transmission, a starter driven gear 18, and the like are pivotally supported. 11 indicates a mission case cover.

An oil pump housing 12 is recessed in the outer surface of the transmission case cover 11 and is arranged so that the axis of the crankshaft 1 intersects with the bottom of the recess, and an oil pump 13 is housed inside the housing. Reference numeral 16 indicates a cap that seals the oil pump housing 12.

At the concave bottom of this oil pump housing 12,
A cylindrical oil pump mounting member 19 is swingably fitted at its outer peripheral edge via an elastic body 20 made of rubber or the like and an outer ring 21 that holds the elastic body 20 . 22 indicates the retainer.

The oil pump 13 is fastened to the outside of the oil pump mounting member 19 with a screw 23, and the pump input shaft 14 is connected to the shaft end of the crankshaft 1 through a through hole 24 in the concave bottom of the oil pump housing 12. It's coming out towards.

Furthermore, a bearing housing 25 is formed on the inner circumferential side of the oil pump mounting member 19, located on the crankshaft 1 side of the through hole 24, and a ball bearing 26, which is a bearing, is formed in the bearing housing 25.
is held, and one end 1a of the crankshaft 1 is pivotally supported by this ball bearing 26.

The pump input shaft 14 and the crankshaft 1 are concentrically opposed to each other, and a joint shaft 14a having a rectangular cross section is cut at the tip of the pump input shaft 14.
Joint hole 1 with a rectangular cross section formed at one end 1a
5 and is coupled to be able to rotate integrally with the shaft.

According to the above configuration, the oil pump 13 is directly driven by the rotation of the crankshaft 1. In this case, the oil pump mounting member 19, the oil pump 13, and the ball bearing 26 are integrally connected, and the elastic body 20 Therefore, even if the tip 1a of the crankshaft 1 oscillates, this oscillation is elastically suppressed by the elastic body 20.

At the same time, since the transmission of vibration to the mission case cover 11 is also buffered, the transmission of vibration to the mission case cover 11 is
It does not vibrate and generate noise.

Furthermore, since no relative displacement occurs between the crankshaft 1 and the pump input shaft 14, there is no wear between the joint shaft 14a and the joint hole 15, and no excessive force is applied to the bearing portion of the pump input shaft 14. First, the durability of the oil pump 13 is improved.

[Effect of idea]

As described above, according to the engine oil pump drive device of this invention, in which the crankshaft and the pump input shaft are concentrically coupled, the pump mounting member that pivotally supports the end of the crankshaft is installed at the same time as the oil pump is installed. Since the oil pump housing of the transmission case is swingably mounted via an elastic body, the vibration of the transmission case caused by vibration of the crankshaft is suppressed, reducing noise, and improving the durability of the oil pump and joint part. It can be increased. In addition, since the runout at the end of the crankshaft is suppressed, for example, the runout of the rotation of the V-belt automatic transmission drive V pulley mounted on one end of the crankshaft can be reduced, and wear and slip of the V-belt can be prevented. This provides excellent effects such as improving the conduction efficiency of the conduction system.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a part of the crankshaft and transmission system of a unit swing type engine of a two-wheeled motor vehicle showing an embodiment of this invention, and Fig. 2 is a cross-sectional view of a part of the transmission system of a two-wheeled motor vehicle illustrating a conventional oil pump drive device. FIG. 2 is a cross-sectional plan view of the transmission system of the unit swing type engine. 1...Crankshaft, 11...Mision case cover (mission case), 12...Oil pump housing, 13...Oil pump, 19...
...Oil pump mounting member, 20...Elastic body, 2
6...Ball bearing (bearing).

Claims (1)

[Scope of utility model registration request] An oil pump housing whose bottom part is perpendicular to the axis of the crankshaft is provided in a transmission case that surrounds the outside of one end of the crankshaft, and the input shaft of the oil pump housed in the oil pump housing is attached to the crankshaft. In the oil pump housing, a cylindrical pump mounting member surrounding the outer circumference of one end of the crankshaft is swingably provided at the bottom of the oil pump housing via an elastic body, and the oil pump is attached to the pump mounting member. An engine oil pump drive device, characterized in that the engine oil pump drive device is equipped with a bearing that supports one end of the crankshaft.