JP3262045B2 - Engine accessory drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an auxiliary driving device for an engine, which supplies lubricating oil to a bearing or the like in the auxiliary driving device for the engine.

[0002]

2. Description of the Related Art FIG. 5 shows a sectional view of a conventional engine accessory driving device.

As shown in FIG. 5, a shaft case 102 is fixed to an end surface of an engine body 101, and a support shaft 103 is fixed in the shaft case 102. The drive shaft 104 has a support shaft 103 at its base end.
The drive shaft 104 is rotatable by fitting the bushing 105 and 106 into the fitting portion and the outer peripheral portion fitting into the shaft case 102, respectively. A drive gear 104 is provided at the base end of the drive shaft 104.
While a is formed, a drive pulley 107 for driving an engine accessory is fixedly connected to the tip of the drive shaft 104. In addition, the drive shaft 104
A lubricating oil supply passage 108 is formed extending axially through the rotation center of the drive shaft 104.
(The bush 105) between the drive shaft 104 and the shaft case (the bush 10)
6) in communication.

Accordingly, when a crankshaft (not shown) is driven to rotate, a driving force is transmitted to a driving gear 104a via a crankshaft gear and an idle gear, and the driving shaft 104 rotates while being supported by a shaft case 102 and a supporting shaft 103. Drive pulley 10
The engine accessories are driven by rotating the 7. At this time, the bearing (the bush 105) between the drive shaft 104 and the support shaft 103 and the drive shaft
When the lubricating oil is supplied to the bearing (the bush 106) between the shaft 104 and the shaft case 102, the drive shaft 104 rotates smoothly.

[0005]

By the way, in the above-mentioned conventional accessory driving apparatus for an engine, the drive shaft 10
The drive gear 104a formed in 4 is a helical gear for the purpose of increasing the meshing ratio with the idle gear and reducing the meshing sound. Therefore, the driving shaft 104 receives a thrust force from the driving gear 104a during the rotation driving. Further, since the rotation of the engine fluctuates depending on the running state, a torque fluctuation acts on the drive shaft 104. Therefore, the drive shaft 104 receives a large thrust force due to the torque fluctuation during the rotation drive. At this time, the end face of the drive shaft 104 collides with the end faces of the shaft case 102 and the support shaft 103, and each of the collision portions A,
There is a problem that a collision sound is generated in B. Furthermore,
The contact at each of the collision portions A and B becomes large, causing wear.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem, and has provided an engine accessory drive device for preventing the occurrence of a collision sound and improving the rotational smoothness of a drive shaft for an engine accessory. The purpose is to do.

[0007]

According to a first aspect of the present invention, there is provided an engine accessory driving apparatus for driving an engine accessory driven by a crankshaft gear. A lubricating oil supply path is provided concentrically and rotatably on a support shaft fixed to the end face of the main body, penetrates the rotation center of the drive shaft from the support shaft in the axial direction, and opposes the support shaft and the drive shaft. A lubricating oil reservoir communicating with the lubricating oil supply passage is provided between the end surfaces of the lubricating oil supply passage, and a throttle means is provided between the lubricating oil supply passage and the lubricating oil reservoir.

Therefore, when a large axial thrust force acts on the drive shaft due to engine torque fluctuations when the drive shaft is driven to rotate, the drive shaft compresses the lubricating oil in the lubricating oil sump chamber. Is an incompressible fluid, and there is a throttling means in the communication path to the lubricating oil supply path, which prevents rapid discharge of the lubricating oil from the lubricating oil reservoir chamber, and the end face of the drive shaft and the support shaft. The collision with the end face is alleviated, and generation of a loud collision sound is prevented.

According to the second aspect of the present invention, a helical gear is fixedly connected to the drive shaft and meshed with the crankshaft gear or the crankshaft gear via an idle gear, and the throttle means is supplied with lubricating oil. It is a pin-shaped member inserted into the road. Therefore, even if the drive shaft tries to move in the axial direction due to the large thrust force acting during the rotation driving of the helical gear, the collision between the end face of the drive shaft and the end face of the support shaft is reduced by the lubricating oil reservoir and the throttle means, and a large collision occurs. Generation of noise and wear at the collision part are prevented. Further, by using a pin-shaped member as the throttle means, the structure can be simplified and the assembling property can be improved.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a sectional view of an engine accessory drive device according to an embodiment of the present invention, FIG. 2 is a sectional view of a main part of the engine accessory drive device of the present embodiment, and FIG. Show.

In the engine accessory drive device of the present embodiment, as shown in FIG. 1, a shaft case 12 is fixed to an end surface of an engine body 11, and a support shaft 13 is provided in the shaft case 12. Fixed. The drive shaft 14 has a fitting hole 14a formed at the base end thereof, and is fitted to the support shaft 13 via a bush 16 so as to be rotatably supported. Also, the drive shaft 1
An intermediate outer peripheral portion of the shaft 4 is rotatably supported by fitting through a bush 17 into a fitting hole 12a of the shaft case 12. A drive gear 18 is formed on the outer peripheral portion of the base end of the drive shaft 14. The drive gear 18 is a helical gear, and is an idle gear that meshes with a crankshaft gear attached to an end of a crankshaft (not shown). 19 is engaged. On the other hand, a drive pulley 20 for driving an engine accessory (not shown) is fitted to the tip of the drive shaft 14, and is fixed by a fixing bolt 21 so as to be integrally rotatable. 22 is the engine body 11
Is a gear case fixed to an end face of the gear case.

The lubricating oil supply passage 2 extends from the support shaft 13 through the center of rotation of the drive shaft 14 in the axial direction.
3 and 24 are formed, and the support shaft 13 and the drive shaft 14
The supply oil passage 25 communicating with the bearing portion (the bush 16) is formed, while the lubricating oil supply passage 2 on the drive shaft 14 side is formed.
4 is provided with a supply oil passage 26 that communicates with a bearing (a bush 17) between the shaft case 12 and the drive shaft 14.

A lubricating oil reservoir 27 is provided between the opposite end surfaces of the support shaft 13 and the drive shaft 14, and the lubricating oil reservoir 27 communicates with the lubricating oil supply passages 23 and 24. The lubricating oil supply passages 23 and 2
A pin-like member 28 as a throttle means is provided between the lubrication oil chamber 4 and the lubricating oil chamber 27. That is, as shown in FIGS. 2 and 3, the pin-shaped member 28 is formed by integrally forming a large-diameter head 28a and a small-diameter shaft 28b.
A through hole 28c is formed in the shaft portion 28b in the axial direction. Then, the head 28a of the pin-shaped member 28
Is fitted into the enlarged diameter portion 23a of the lubricating oil supply passage 23 without any gap, while the shaft portion 28b is inserted into the lubricating oil supply passage 24 with a small gap S. The head 28a and the shaft 28b
May have the same diameter.

Accordingly, the lubricating oil supply passages 23 and 24 are in communication with each other through the through hole 28c of the pin-shaped member 28, and the lubricating oil supply passage 23 extends from the lubricating oil supply passage 23 through the through hole 28c.
The lubricating oil can reliably flow through the lubrication oil supply 4, and can be supplied to the bearing (the bush 17) via the supply oil passage 26.
Further, the lubricating oil supply passage 24 and the lubricating oil reservoir 27 are provided with a clearance S between the shaft 28 b of the pin-shaped member 28 and the drive shaft 14.
The rapid flow of the lubricating oil in the lubricating oil supply passage 24 and the lubricating oil storage chamber 27 is suppressed.

Here, the operation of the engine accessory driving device of the above-described embodiment will be described in detail.

When a crankshaft (not shown) is driven to rotate, a driving force is transmitted to a driving gear 18 via a crankshaft gear and an idle gear 19, as shown in FIG. The driving pulley 20 fixed to the tip portion is driven to rotate, and the engine accessory is driven. Then, the lubricating oil is supplied to the bearing (the bush 16) from the supply oil passage 25 through the lubricating oil supply passage 23, and is supplied to the bearing (the bush 17) from the supply oil passage 26 through the lubrication oil supply passages 23 and 24. Thus, the drive shaft 14 is smoothly rotated.

At this time, since the drive gear 18 is a helical gear, a large thrust force may act on the drive shaft 14 in the axial direction due to fluctuations in the engine torque. In this case, as shown in FIG. 2, for example, when the drive shaft 14 receives a thrust force and tries to move rightward in FIG. 2, the drive shaft 14 is lubricated with the end face of the support shaft 13. The lubricating oil in the reservoir chamber 27 is to be compressed. However, since the lubricating oil is an incompressible fluid, its volume does not shrink and tends to flow to the communicating lubricating oil supply passage 24 side. However, the communication passage from the lubricating oil reservoir chamber 27 to the lubricating oil supply passage 24 has a shaft portion 2 of the pin-shaped member 28.
8b, and only a minute gap S is provided. Therefore, rapid flow of the lubricating oil from the lubricating oil reservoir chamber 27 to the lubricating oil supply passage 24 is prevented, and the movement of the drive shaft 14 is suppressed. Collision (collision part C in FIG. 1)
Is reduced, and generation of a loud collision sound and wear due to the collision are prevented.

In the above-described embodiment, the pin-like member 28 is used as the throttle means between the lubricating oil supply passages 23 and 24 and the lubricating oil reservoir chamber 27, and the pin-like member 28 is used as the head 28a and the shaft 28b. And the through-hole 28c, but is not limited to this structure. FIG. 4 shows a perspective view of a pin-shaped member as another throttle means in the accessory drive device for the engine of the present invention.

As shown in FIG. 4, the pin-shaped member 30 has a large-diameter head 30a, a small-diameter shaft 30b, and a flange 30c therebetween. A through hole 30d is formed penetrating through the flange portion 30c in the axial direction. And this pin-shaped member 30
Of the lubricating oil supply passage 23, the shaft portion 30b is inserted through the gap S of the lubricating oil supply passage 24. At this time, the lubricating oil supply is performed by the flange portion 30c. The fitting length of the head 30a to the passage 23 is defined, and it is not necessary to form the enlarged diameter portion 23a in the lubricating oil supply passage 23.

As described above, in the present embodiment, the lubricating oil supply passages 23 and 24 are formed by penetrating the support shaft 13 through the rotation center of the drive shaft 14 in the axial direction, and the support shaft 13 and the drive shaft A lubricating oil reservoir chamber 27 is provided between the end surfaces facing the lubricating oil supply 14, and a pin-shaped member 28 is provided between the lubricating oil supply passage 24 and the lubricating oil reservoir chamber 27 to form a small gap S. Even if the drive shaft 14 attempts to move in the axial direction due to torque fluctuations, the lubricating oil in the lubricating oil reservoir chamber 27 is an incompressible fluid, and the minute gap S causes rapid lubricating oil flow to the lubricating oil supply passage 24. As a result, the movement of the drive shaft 14 is suppressed, the collision with the support shaft 13 is reduced, and the generation of a large collision sound and the wear due to the collision can be prevented. In addition, by using the pin-shaped members 28 and 30 as the narrowing means, the structure can be simplified and the assembling property can be improved.

[0022]

As described in detail in the above embodiment, according to the engine accessory driving apparatus of the first aspect, the drive shaft for driving the engine accessory is rotated concentrically with the support shaft of the engine body. A lubricating oil supply path that is freely supported and that axially penetrates the rotation center of the drive shaft from the support shaft and that communicates with the lubricating oil supply path between opposing end surfaces of the support shaft and the drive shaft Since the reservoir chamber is provided and the throttle means is provided between the lubricating oil supply passage and the lubricating oil reservoir chamber, even if a large axial thrust force acts upon the rotation of the drive shaft, the lubricating oil reservoir chamber is lubricated. Oil is an incompressible fluid, and since there is a throttling means in the communication path to the lubricating oil supply path, rapid discharge of lubricating oil from the lubricating oil storage chamber is prevented, and The collision between the end face of the support shaft and the end face of the support shaft can be mitigated to prevent generation of a loud collision sound and wear due to the collision, and as a result, it is possible to improve the rotational smoothness of the drive shaft for the engine accessory. it can.

According to the second aspect of the present invention, the helical gear is fixedly connected to the drive shaft and meshed with the crankshaft gear or the crankshaft gear via the idle gear to lubricate the throttle means. Since the pin-shaped member is inserted into the oil supply passage, the lubricating oil chamber and the throttle means make contact with the end face of the drive shaft even if the drive shaft attempts to move in the axial direction due to a large thrust force acting when the helical gear rotates. Collision with the end face of the support shaft is mitigated, loud collision noise is generated, and wear due to the collision can be prevented. In addition, the use of a pin-shaped member as the throttle means simplifies the structure and improves the ease of assembly. Improvement can be achieved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an accessory driving device for an engine according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a main part of the accessory drive device for the engine according to the embodiment.

FIG. 3 is a perspective view of an aperture pin member.

FIG. 4 is a perspective view of a pin-shaped member as another throttle means in the accessory drive device for the engine of the present invention.

FIG. 5 is a cross-sectional view of a conventional engine accessory drive device.

[Explanation of symbols]

 Reference Signs List 11 engine main body 12 shaft case 13 support shaft 14 drive shaft 16, 17 bush 18 drive gear (helical gear) 20 drive pulley 23, 24 lubricating oil supply path 25, 26 supply oil path 27 lubricating oil reservoir chamber 28, 30 pin-shaped member ( Aperture means)

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F02B 67/04 F16H 1/06 F16H 57/04 F02B 77/00 F01M 1/06 F01M 9/10

Claims (2)

(57) [Claims] 1. A crankshaft gear attached to an end of a crankshaft of an engine, a support shaft fixed to an end face of an engine body, and the crankshaft supported concentrically and rotatably on the support shaft. A drive shaft rotatably driven by a gear to drive an engine accessory, a lubricating oil supply passage extending from the support shaft through a rotation center of the drive shaft in an axial direction and communicating with a lubricating oil supply unit, and the support shaft A lubricating oil reservoir provided between the opposed end faces of the drive shaft and the lubricating oil supply passage, and a throttle means provided between the lubricating oil supply passage and the lubricating oil reservoir. An auxiliary drive device for an engine, comprising: 2. The accessory driving device for an engine according to claim 1, wherein a helical gear is fixed to the drive shaft, and the helical gear meshes with the crankshaft gear or an idle gear from the crankshaft gear. An auxiliary drive device for an engine, wherein the throttle means is a pin-shaped member inserted into the lubricating oil supply passage.