JP2696329B2 - Gear shaft lubrication device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a gear reduction device for a vehicle such as a motorcycle, and more particularly, to a gear shaft lubrication device included in the gear reduction device.

(Prior art) A gear reduction device in a power transmission system of a motorcycle includes:
Conventionally, there is the one configured as follows.

That is, the gear reduction device has a gear case for housing a gear group, and an opening is formed on a side portion of the gear case so that the gear group can be put in and out of the gear case. A cover body that freely closes is provided.

A gear shaft having an axis extending substantially horizontally is provided in an internal space surrounded by the gear case and the cover body, and the gear case is supported by the gear case and the cover body so that the gear shaft is rotatable around the axis. Have been. One of the gears in the group of gears is provided in the gear case so as to rotate with the gear shaft. Lubricating oil is sealed in the internal space. In this case, in order to prevent the lubricating oil from leaking out of the gear case, a space between the opening edge of the opening and the outer edge of the cover body facing the opening is provided. Is provided with a gasket.

The gasket is a thin packing, and has a small strength. Therefore, in order to give the gasket a certain degree of rigidity, the width of a part of the gasket is increased. In this case, the edge of the gasket on the internal space side is protruded toward the internal space, and this is It is a projection.

(Problems to be Solved by the Invention) By the way, when the gear reduction device is driven to rotate the gear, more lubricating oil is scraped up to the upper part of the outer periphery of the gear, and the gear is rotated. There is a case where it is desired to supply sufficient lubricating oil to other gears and the like located in the rotation direction front of the upper part.

However, in the conventional technique, the lubricating oil scooped up by the gear may scatter to the side of the gear and may not be sufficiently supplied to the other gears.

Therefore, the projecting portion is extended, and the projecting portion covers the outer peripheral portion of the gear in the axial direction of the gear shaft from the cover body side, so that the lubricating oil flows to the side of the gear. It is conceivable to prevent scattering.

However, when configured as described above, most of the lubricating oil scraped up by the gears is supplied to the other gears and the like, and the supply of the lubricating oil to the bearing of the gear shaft in the cover body is insufficient. This tends to result in insufficient lubrication at the bearing of the gear shaft.

(Objects of the Invention) The present invention has been made in view of the above circumstances, and supplies lubricating oil to other gears and the like located in the upper part of the gears in the rotational direction, and controls the gear shaft in the cover body. It is an object of the present invention to ensure that lubricating oil is sufficiently supplied to the bearings, and that these are achieved with a simple configuration.

(Structure of the Invention) The features of the present invention for achieving the above object are as follows.

Note that, in the section of “Configuration of the Invention”, the terms in parentheses below correspond to the terms in the claims.

An axle (gear shaft) 16 having an axis extending substantially horizontally in an internal space surrounded by the gear case 22 and the cover 25 is provided with a cover body 25 for closing an opening 23 formed on a side portion of the gear case 22.
The axle (gear shaft) 16 is supported by the gear case 22 and the cover body 25 so as to be rotatable around its axis, and a driven gear (gear) 32 that rotates together with the axle (gear shaft) 16 is provided. Is provided in the gear case 22 and the lubricating oil 34 is sealed in the internal space, and a thin plate-like gasket (packing) 35 is provided between the opening edge of the opening 23 and the outer edge of the cover body 25 facing the opening 23. A vehicle in which an edge of the gasket (packing) 35 on the side of the internal space is protruded toward the internal space to form a protruding portion 35a, and a rib 44 protrudes from the inner surface of the cover body 25 In the gear reduction device for use, a tooth portion (outer peripheral portion) 32a on the upper portion of the driven gear (gear) 32
The projecting portion 35a covers at least half of the tooth portion (outer peripheral portion) 32a around the axis from the cover body 25 side in the axial direction of the axle (gear shaft) 16, Gear (gear) 32 upper tooth portion (outer peripheral portion) 32a
A lubricating oil 34 flowing down from the side of the through hole 38 through the protruding portion 35a.
A guide piece 44a for guiding the support member of the axle (gear shaft) 16 in the cover body 25 is formed integrally with the rib 44.

(Operation) The operation of the above configuration is as follows.

In the section of “action”, the terms in parentheses described below correspond to the terms in the claims.

The protruding portion 35a of the gasket (packing) 35 includes at least half of the tooth portion (outer peripheral portion) 32a around the axis including the upper tooth portion (outer peripheral portion) 32a of the driven gear (gear) 32. The gear shaft 16 is covered from the cover body 25 side in the axial direction.

Therefore, the tooth portion (outer peripheral portion) of the driven gear (gear) 32
Lubricating oil 34 that is scraped up by 32a (arrow A in FIGS. 3 and 4)
Of the gasket (packing) 35 is suppressed by the protrusion 35a of the gasket (packing) 35.

Therefore, the lubricating oil 34, which is scraped up as described above,
Since it reaches the upper portion of the driven gear (gear) 32 sufficiently, the lubricating oil 34 is sufficiently supplied to other gears and the like located in front of the driven gear (gear) 32 in the rotational direction and the lubricating oil is lubricated. Will be performed sufficiently.

Then, the lubrication described above is applied to the gear case 22 and the cover body 25.
Is obtained by projecting a part of the gasket (packing) 35 for sealing between the first and second parts, so that an increase in the number of parts is avoided, and thus the lubrication is achieved with a simple structure. .

Further, a through hole 38 is formed in the protruding portion 35a in the vicinity of the upper tooth portion (outer peripheral portion) 32a of the driven gear (gear) 32,
The lubricating oil 34 flowing down from the through hole 38 through the protruding portion 35a is applied to the axle (gear shaft) in the cover body 25.
The guide piece 44a for guiding to the 16 support portions is formed integrally with the rib 44, and the following effects are produced.

That is, if the projection 35 of the gasket (packing) 35
a, the tooth portion (outer peripheral portion) 32a of the driven gear (gear) 32
Assuming that most of the lubricating oil 34 scraped up by the above is supplied to the other gears and the like, the supply of the lubricating oil 34 to the bearing of the axle (gear shaft) 16 in the cover body 25 tends to be insufficient. Become.

Therefore, as described above, the through hole 38 is formed in the protrusion 35a.
And the guide piece 44a is formed. Therefore, the tooth portion (outer peripheral portion) 32a of the driven gear (gear) 32 is formed.
A part of the lubricating oil 34 scooped up in the above-described manner flows into the cover body 25 through the through hole 38, and the guide piece 44a
To be directed to the bearing of the axle (gear shaft) 16.

Therefore, as described above, the lubricating oil 34 is sufficiently supplied to the other gears and the like, and the lubricating oil 34 is also supplied to the support portion of the axle (gear shaft) 16 in the cover body 25, and the lubrication is performed. Will be performed.

The lubrication described above is obtained by integrally forming the guide pieces 44a using the ribs 44 for reinforcing the cover body 25.
Therefore, the above lubrication is achieved with a simple configuration.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 2 is a plan sectional view of a drive device in the motorcycle. In the figure, reference numeral 1 denotes an engine, which transmits power to a rear wheel 3 via a power transmission system 2. Then, the motorcycle runs by driving the rear wheel 3 by this. The arrow Fr in the figure indicates the front of the motorcycle.

Reference numeral 4 denotes a crankshaft of the engine 1. The crankshaft 4 is supported by a crankcase 5. 6 is a connecting rod.

The power transmission system 2 has a transmission case 8, which is formed so as to be continuous with the crankcase 5. An output shaft 9 having a substantially horizontal axis and extending in the vehicle width direction is supported at an intermediate portion of the transmission case 8 in the front and rear directions. The output shaft 9 receives power from the crankshaft 4 via a V-belt type transmission 10. The V-belt type transmission 10 includes a driving pulley 12 on the crankshaft 4, a driven pulley 13 on the output shaft 9, and a V-belt 14 wound around the pulleys 12, 13. The speed reduction ratio is configured to decrease as the speed increases.

Further, the rear wheel 3 is supported at the rear end of the transmission case 8 by an axle supported so that an axis thereof is substantially horizontal and extends in a vehicle width direction.
A hub 18 that supports a tire 17 is fixed to the axle 16. 19 is a brake device.

A gear reduction device 21 for reducing the power of the output shaft 9 and transmitting the reduced power to the axle 16 is provided. The gear reduction device 21 will be described in detail.

A gear case 22 is integrally formed on the right side of the rear end of the transmission case 8. An opening 23 that opens the inside of the gear case 22 toward the inside of the transmission case 8 is formed on the left side of the gear case 22. A cover 25 is provided to close the opening 23 so that it can be opened and closed.
Reference numeral 25 is screwed to the opening edge of the opening 23 with a number of bolts 26.

Each part of the output shaft 9 and the axle 16 is connected to the gear case 22.
It is arranged in an internal space surrounded by and the cover body 25.
The output shaft 9 and the axle 16 are supported by the gear case 22 and the cover 25 so that the output shaft 9 and the axle 16 can rotate around their respective axes via bearings. The left end of the axle 16 is provided on the inner surface of the cover 25. It is rotatably fitted into the formed bearing hole 27. In the same manner as described above, the intermediate shaft 28 is rotatably supported by the gear case 22 and the cover body 25 via bearings.

A drive gear 29 is formed on the output shaft 9, and a large reduction gear 30 meshing with the drive gear 29 is attached to the intermediate shaft 28. Further, a reduction gear 31 is attached to the intermediate shaft 28, and a driven gear 32, which is a gear meshing with the reduction gear 31, is attached to the axle 16 and rotates with the axle 16. It has been. That is, the axle 16 is a gear shaft for the driven gear 32, and the driven gear 32 is provided in the gear case 22.

A lubricating oil 34 for lubricating the gears 29 to 32 is sealed in an internal space surrounded by the gear case 22 and the cover 25. In this case, in order to prevent the lubricating oil 34 from leaking out of the gear case 22, a gasket 35 as a thin plate-shaped packing is provided between the opening edge of the opening 23 and the outer edge of the cover body 25 facing the opening edge. It is interposed. The gasket 35 is sandwiched between the opening edge of the opening 23 and the outer edge of the cover body 25 by the bolt 26 to seal the gap therebetween.

If the driving force of the engine 1 is transmitted from the crankshaft 4 to the output shaft 9 via the V-belt type transmission 10, this power is then sequentially transmitted to the driving gear 29 → the reduction gear 30 → the intermediate shaft 28.
→ The reduction gear 31 → the driven gear 32 → the axle 16 → the rear wheel 3 are transmitted, and the motorcycle runs. At this time, the output shaft 9 and the axle 16 rotate in the direction indicated by the arrow R in the figure.

In the above case, the rotation of each of the gears 29 to 32 causes the lubricating oil 34 to be scooped up by these shafts 9, 9 in the gear case 22.
Supplied to 16,28 bearings to lubricate them.

1 and FIGS. 3 to 5, an edge of the gasket 35 on the side of the internal space surrounded by the gear case 22 and the cover body 25 projects toward the internal space. It has been. The width of each part of the gasket 35 is increased by the protruding portion 35a, so that the gasket 35 has predetermined strength and rigidity.

Tooth portion of the driven gear 32 around the axis of the driven gear 32
More than half of 32a is covered by the protruding portion 35a in the axial direction of the axle 16 from the cover body 25 side, and the upper tooth portion 32a of the driven gear 32 is included in the above-mentioned half or more. Have been.

For this reason, the lubricating oil 34 (arrow A in FIGS. 3 and 4), which is scooped up by the tooth portions 32a of the driven gear 32, tends to scatter to the side of the driven gear 32, and this is because It is suppressed by the projection 35a of the gasket 35. Therefore, the lubricating oil 34 that is scraped up as described above sufficiently reaches the upper portion of the driven gear 32, and is thus sufficiently supplied to the gears 29 to 31 located in front of the driven gear 32 in the rotational direction. It has been lubricated well.

In the vicinity of the upper teeth 32a of the driven gear 32, a through hole 38 is formed in the protruding portion 35a of the gasket 35 so as to penetrate from the gear case 22 side to the cover body 25 side. In addition, an inverted triangular projecting piece 39 extending from the lower edge of the projecting portion 35a toward the axle 16 corresponding to the through hole 38 is formed integrally with the projecting portion 35a.

Therefore, the lubricating oil scraped up by the driven gear 32
A part of 34 passes through the through hole 38 toward the cover body 25 and flows down along the protruding piece 39 as shown by an arrow B in FIGS. From the bearing hole 27 side. Thus, the sliding portion between the axle 16 and the support hole 27, which is the support portion of the axle 16 in the cover body 25, is lubricated.

In the above case, the lubricating oil 34 that is going to pass through the through hole 38
The oil amount can be arbitrarily set by simply selecting various sizes and shapes of the through holes 38. Further, the through hole 38 here is a concept including a so-called notch.

Further, an oil groove 42 extending in the axial direction of the axle 16 is formed in an upper portion of the inner peripheral surface of the bearing hole 27, and the oil groove 42
A cutout portion 43 is formed at an upper portion of the portion that is opened inward. Therefore, as described above, the lubricating oil
When the lubricating oil 34 is supplied, the lubricating oil 34
As shown in the figure, the axle passes through the notch 43 and the oil groove 42 sequentially.
Smoothly flows into the sliding contact portion between the support hole 16 and the bearing hole 27 to sufficiently lubricate it.

A radial rib 44 centering on the bearing hole 27 is formed on the inner surface of the cover body 25 for reinforcement, and a guide piece 44a is integrally formed with one of the ribs. As shown by an arrow D in FIGS. 3 to 5, the guide piece 44a transfers the lubricating oil 34 flowing down from the through hole 38 through the protruding portion 35a and the protruding piece 39 to the cover body 25 in the cover body 25. The lubrication is guided toward the notch 43 of the bearing of the axle 16 to further ensure the lubrication.

As shown in FIG. 4, a portion where the cover body 25 supports the left end of the intermediate shaft 28 also includes a support hole 27 ', an oil groove 42', and a notch.
43 ', and a guide piece 44a', which has the same structure as the above-described left end support portion of the axle 16, and a part of the lubricating oil 34 which has been scraped up by the driven gear 32 here. Is also effectively supplied.

(Effect of the Invention) According to the present invention, a cover body for closing an opening formed on a side portion of a gear case is provided, and a gear shaft whose axis extends substantially horizontally in an internal space surrounded by the gear case and the cover body. And the gear shaft is supported on the gear case and the cover so as to be rotatable around the axis.A gear rotating together with the gear shaft is provided in the gear case, and lubricating oil is supplied to the internal space. On the other hand, a thin plate-shaped packing is interposed between the opening edge of the opening and the outer edge of the cover body facing the opening, and the edge of the packing on the inner space side projects toward the inner space. In the vehicular gear reduction device in which a rib is protruded from an inner surface of the cover body, a half or more of the outer peripheral portion around the axis including the outer peripheral portion of the upper portion of the gear, The protrusion is on the top In the axial direction of the gear shaft are to cover from the cover side.

For this reason, the lubricating oil scooped up on the outer peripheral portion of the gear is prevented from scattering to the side by the protrusion of the packing.

Therefore, since the lubricating oil scraped up as described above reaches the upper portion of the gear sufficiently, the lubricating oil is sufficiently supplied to other gears and the like located in the rotation direction front of the upper portion of the gear, The lubrication is sufficiently performed.

The above-mentioned lubrication is obtained by protruding a part of the packing for sealing between the gear case and the cover body, and an increase in the number of parts is avoided. Is achieved with a simple configuration.

Further, a through hole is formed in the protruding portion in the vicinity of the outer peripheral portion of the upper portion of the gear, and lubricating oil flowing down from the through hole side through the protruding portion is supported by the gear shaft support portion in the cover body. Are formed integrally with the rib, and the following effects are produced.

That is, assuming that most of the lubricating oil scraped up by the outer peripheral portion of the gear is supplied to the other gears and the like by the projecting portion of the packing, lubricating the bearing portion of the gear shaft in the cover body to the gear portion Oil supply tends to be in short supply.

Therefore, as described above, a through hole is formed in the protruding portion, and a guide piece is formed. For this reason, a part of the lubricating oil scraped up at the outer peripheral portion of the gear passes through the through hole. And flows into the cover body side, and is guided by the guide piece to be directed to the bearing portion of the gear shaft.

Accordingly, as described above, the lubricating oil is sufficiently supplied to the other gears and the like, and the lubricating oil is also supplied to the bearing portion of the gear shaft in the cover body, so that the lubrication is performed.

And the above-mentioned lubrication was obtained by integrally molding the guide pieces using the ribs for reinforcing the cover body, so that an increase in the number of parts was avoided, and therefore,
The above lubrication is achieved with a simple configuration.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention, and FIG.
FIG. 2 is a plan sectional view of the power transmission system of the motorcycle, FIG. 3 is a sectional view taken along line III-III of FIG.
FIG. 4 is an internal view of the cover taken along the line IV-IV in FIG.
FIG. 5 is a cross-sectional view taken along line VV of FIG. 16 ... axle (gear shaft), 21 ... gear reduction gear, 22 ... gear case, 23 ... opening, 25 ... cover body, 27 ... bearing hole, 32 ... driven gear (gear), 32a ... ... Tooth (outer circumference), 34 ... Lubricant, 35 ... Gasket (packing), 35a ... Protrusion, 38 ... Through hole, 44 ... Rib, 44a
...... Guide pieces.

Claims (1)

(57) [Claims] A cover body for closing an opening formed in a side portion of a gear case is provided, and a gear shaft whose axis extends substantially horizontally is provided in an internal space surrounded by the gear case and the cover body. Is supported by the gear case and the cover so as to be rotatable about its axis, a gear rotating with the gear shaft is provided in the gear case, and lubricating oil is sealed in the internal space, while the opening is A thin plate-like packing is interposed between the opening edge of the cover body and the outer edge of the cover body facing the opening edge, and the edge of the packing on the internal space side is protruded toward the internal space, and this is protruded. And a gear reduction device for a vehicle in which a rib is protruded from an inner surface of the cover body, wherein at least half of the outer peripheral portion around the axis including the outer peripheral portion of the upper portion of the gear, and the projecting portion is the gear. Above in the axial direction of the shaft In the vicinity of the outer peripheral portion of the upper portion of the gear, a through hole is formed in the protruding portion, and the lubricating oil flowing down from the through hole side through the protruding portion is covered with the lubricating oil in the cover body. A lubricating device for a gear shaft, wherein a guide piece for guiding to a bearing portion of the gear shaft is formed integrally with the rib.