JPH03219159A - Lubricating device for reduction gear mechanism - Google Patents

Abstract

PURPOSE:To maintain lubricating performance so as to reduce mechanical loss by passing an oil gallery through the inner center part of a boss body with the tip thereof extended in the vicinity of primary gear mechanism, as well as opening an oil nozzle at the tip part of the oil gallery, and connecting a lubricating oil supply system to this oil gallery. CONSTITUTION:A boss body 31 with the tip thereof extended in the vicinity of primary gear mechanism is protrusively provided at the clutch chamber 12 side outer face of a transmission cover 7. An oil gallery 32 is passed through the inner center of the boss body 31, and an oil nozzle 33 directed to a part of the outer periphery of the primary gear mechanism is opened at the tip part of the oil gallery 32. The oil gallery 32 is connected to an oil gallery passing through the thick wall part of the transmission cover 7, and its starting end is opened to the inner face of the transmission cover 7 and communicated with an oil pipe 27. Therefore a part of lubricating oil passes from the oil pipe 27 through the oil gallery 32 and is injected from the oil nozzle 33 to wet the primary gear mechanism and lubricate its meshed part.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a lubricating device for a reduction gear mechanism used in a transmission device such as a motorcycle.

(Prior Art) A typical structure of a power transmission system of an engine mounted on a motorcycle or the like is as follows.

First of all, the crankshaft is in the crankcase.

The countershaft and driveshaft are mounted in parallel (the part that pivotally supports the countershaft and driveshaft is also called the mission case, but since it is an integral structure, in this case it is simply called the crankcase).
.

The crankshaft and the countershaft are supported by protruding outward from one side wall of the crankcase, and a primary drive gear is attached to the protruding end of the crankshaft, and a primary driven gear is attached to the countershaft. It meshes with the. An opening/closing clutch mounted on the countershaft is interposed between the primary driven gear and the countershaft.

A clutch cover is placed on the side wall of the crankcase to form a clutch chamber, and the primary gear mechanism and opening/closing clutch are housed within this clutch chamber.

A mission gear mechanism is interposed within the crankcase between the countershaft and the driveshaft.

In this way, a reduction gear mechanism is constructed between the crankshaft and the drive shaft, but in order for the mechanism to operate smoothly and ensure durability, it is necessary to supply lubricating oil to each sliding part. be.

In other words, for the bearing part of each shaft, the relative rotation part between the shaft and the gear in the mission gear mechanism, and the relative sliding part between the shaft and dog clutch, oil holes are provided in the countershaft and drive shaft axes. Oil is supplied through.

To lubricate the gear mesh of a mission gear mechanism, the lower part of the gear is immersed in oil pooled in an oil pan at the bottom of the crankcase, and oil is supplied to the entire tooth area as it rotates, or the upper part of the gear train mesh is immersed in oil pooled in the oil pan at the bottom of the crankcase. In some cases, an oil pipe with a large number of drip holes is installed along the pipe, and the oil supplied into the oil pipe is dripped onto the meshing part.

On the other hand, the meshing portion of the primary gear mechanism in the clutch chamber is lubricated by scraping up oil from the primary driven gear. Oil is stored at the bottom of the clutch chamber, immerses below the liquid level below the primary driven gear, and is set so that the oil scraped up by rotation wets the meshing parts.

However, with this method, the lower part of the primary driven gear is constantly immersed to stir the oil, and since the primary driven gear has a relatively large diameter, it causes an increase in mechanical loss.

(Invention or Problem to be Solved) This invention was made in view of the above-mentioned problems, and it is possible to supply lubricating oil to the primary gear mechanism without relying on the oil scraping method of the primary driven gear. The purpose of the present invention is to provide a lubrication device for a reduction gear mechanism that reduces mechanical loss during gear movement.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above object, a lubrication device for a reduction gear mechanism of the present invention includes a crankshaft, a countershaft, and a drive shaft mounted in parallel on a crankcase. A clutch cover is attached to the outer surface of one side wall to form a clutch chamber, and a primary gear mechanism and an open/close clutch mechanism are interposed between the crankshaft protruding into the clutch chamber and one end of the countershaft, and the countershaft In a reduction gear mechanism in which a mission gear mechanism or a transmission gear mechanism is interposed between a drive shaft and a drive shaft, a boss body whose tip extends close to the primary gear mechanism is formed on the outer surface of one side wall of the crankcase forming the clutch chamber, and a boss body whose tip extends near the primary gear mechanism is formed. An oil gallery is opened in the center, and an oil nozzle directed toward the primary gear mechanism is opened at the tip, and this boss is a lubricating oil supply system that supplies lubricating oil to the bearings of each shaft and the transmission gear mechanism. It is configured to be connected to the oil gear gallery inside the body.

(Function) With this configuration, part of the oil pumped by the oil pump is injected from the oil nozzle to wet the primary gear mechanism and provide lubrication to its meshing parts.

All gears can be forced to be lubricated along with the mission gear mechanism, reducing the overall amount of oil stored, and since the primary driven gear does not need to be immersed in oil, mechanical loss is reduced.

(Example) DESCRIPTION OF THE PREFERRED EMBODIMENTS The drawings showing embodiments of the present invention will be explained below.

FIGS. 1 and 2 show a reduction gear mechanism for a motorcycle, which is laid out as follows.

Reference numeral 1 in the figure indicates a crankcase, and the inside of the crankcase 1 is separated into a crank chamber 2 and a mission chamber 3 by a partition IC. Inside the crank chamber 2 is a crankcase side wall 1.
A crankshaft 4 is mounted astride the side walls 1 and 1b, and inside the mission chamber 3, a countershaft 5 and a drive shaft 6, which are parallel to the crankshaft 4, are mounted on the side wall 1.
a and a transmission cover 7 which is removably replaced with a part of the side wall 1b. This is done when the mission cover 7 is attached and removed as well as the counter shaft 5. It is of a cassette type in which the drive shaft 6 can be inserted and removed integrally.

One end 4a of the crankshaft 4 protrudes from the partition wall 1b, and a primary drive gear 8 is pivotally supported. Similarly, a primary driven gear 9 is rotatably supported on one end 5a of the counter shaft 5 protruding from the mission cover 7, and meshes with the primary drive gear 8. This primary driven gear 9 is coupled to the countershaft 5 via an opening/closing clutch 10 that is mounted adjacent thereto.

A clutch cover 1] is placed over the outer surface of the side wall 1b to form a clutch chamber 12, and the primary drive, driven gear 8.9, and opening/closing clutch 10 are accommodated in this chamber.

In the mining chamber 3, a drive gear train 13 and a driven gear train 14 of a mission gear mechanism are respectively mounted on a countershaft 5° and a drive shaft 6, and a reduction ratio is selected by a gear shift.

A drive sprocket gear 15 is fixed to a protruding end 6a extending from the side wall 1a of the drive shaft 6, and transmits power to the drive wheels via a chain.

Although the power transmission system is arranged as described above, the crankcase 1 is also equipped with a kick shaft 16 and a balancer shaft 17. The balancer shaft 17 has a balancer driven gear 19 supported at its end, and a balancer drive gear 18 attached to the primary drive gear 4.
The crankshaft 4 meshes with the crankshaft 4, and rotation is applied from the crankshaft 4.

Next, the lubricating oil supply system will be described.

An oil pump 20° 21 is arranged at the bottom of the mission chamber 3, and is connected to one of the driven gear trains of the mission gear mechanism.
It is driven by a common oil pump driven gear 22 that meshes with the oil pump 4a. The oil pump 20 supplies oil for lubricating the engine, and the oil pump 21 supplies oil for lubricating the reduction gear mechanism.

The oil pumped by the oil pump 21 passes through the side walls 1a and 1b of the crankcase 1 and the thick part of the transmission cover 7 through an oil gear gallery (not shown) and a countershaft 5. Oil passage hole 2 passing through the axis of the drive shaft 6
3. Through 24, bearings 25a, 25b, 26a
, 26b and the drive gear train 13 of the mission gear mechanism,
It is guided to the shaft joint portion of the driven gear train 14, etc.

Moreover, an oil pipe 2
7 is piped. The oil pipe 27 has a large number of oil holes arranged along the axial direction, and is installed across the crankcase side wall 1a and the transmission cover 7. It is inserted into the blind hole 28 on the side wall 1a side, and is in close contact with the inner surface of the mission cover 7 side.

The blind hole 28 has an oil gear lary 30 that passes from the oil reservoir 29 at the end of the drive shaft 6 through the thick part of the side wall 1a.
are in communication, and oil is supplied to the oil pipe 27. The supplied oil drips from the oil hole to the drive and driven gear trains 13 and 14 of the mission gear mechanism, and is used to lubricate the meshing parts.

Further, on the outer surface of the transmission cover 7 on the side of the clutch chamber 12, as shown in FIG. Ru. An oil gear lary 32 passes through the inner center of the boss body 31, and an oil nozzle 33 is opened at the tip end thereof, pointing toward a part of the outer periphery of the primary gear mechanism.

The oil gearing 32 is connected to an oil gearing 34 passing through the thick portion of the transmission cover 7.

The starting end of this oil gear rally 34 is connected to the oil pipe 2.
It opens on the inner surface of the mission cover 7 opposite to the 7 end and communicates with the oil pipe 27.

Therefore, a portion of the lubricating oil from the oil pipe 27 passes through the oil gear 34, 32 and is injected from the oil nozzle 33 to wet the primary gear mechanism and lubricate its meshing portion.

In this case, depending on the setting of the orientation direction of the oil nozzle 33,
Adjacent balancer gear mechanism (balancer drive gear 18
Oil is also poured into the balancer driven gear 19) to lubricate its meshing parts.

In the figure, reference numeral 35 denotes an oil nozzle that branches off from the oil gear rally 34 and opens into the inner surface of the mission cover 7. The drive and driven gear of the mission gear mechanism are located in the shadow part where oil is less likely to drip from the oil pipe 27.
For example, oil is supplied to the meshing portions 13a and 14a.

In this way, oil is directly supplied to all relative sliding parts of the reduction gear mechanism, smoothing the operation of the mechanism,
And durability is improved.

The method of immersing the rotating gear in accumulated oil and scraping it up has been abolished, and the primary driven gear 9, which has a particularly large diameter, has been abolished.
Since there is no need to stir the oil, the mechanical loss caused by this is reduced and efficiency is improved. It does not require a large amount of oil to be stored.

In addition, although the example shown in the above figure is equipped with a cassette type mission gear mechanism, in the boat fishing rank case, a boss body and an oil nozzle are installed on the side wall 1b to which the clutch cover is attached. . The boss body may be an integral structure or may be separately manufactured and implanted. An integral structure can be formed at the same time as casting, and in particular, one integrally cast with the transmission cover is easy to process and has good productivity, so it can be provided at low cost.

〔Effect of the invention〕

As described above, the lubrication device for a reduction gear mechanism according to the present invention includes a reduction gear mechanism in which a primary gear mechanism is disposed between a crankshaft and a countershaft in a clutch chamber formed by one side wall of a crankcase and a clutch cover. A boss body whose tip extends close to the primary gear mechanism is formed on the outer surface of one side wall of the crankcase forming the clutch chamber, an oil gear lary is opened in the inner part of the boss body, and the primary gear mechanism is connected to the tip of the boss body. A lubricating oil supply system that supplies lubricating oil to the bearings of each of the shafts and the mission gear mechanism is connected to the oil gear rally inside this boss body, and the primary driven gear scrapes up the oil. Since the oil is directly supplied to the primary gear mechanism by injection without any friction, the amount of oil stored is reduced, lubrication performance is maintained, and this has the effect of reducing mechanical loss and improving transmission efficiency. be.

[Brief explanation of drawings]

Fig. 1 is a developed sectional view of a reduction gear mechanism for a motorcycle engine showing an embodiment of the present invention, Fig. 2 is a vertical sectional side view of the reduction gear mechanism of Fig. 1, and Fig. 3 is Fig. 2A. - It is a sectional view of the important part in the direction of the A arrow. 1... Crank case, LA, LB... Side wall, 2... Crank chamber, 3... Mission chamber, 4... Crankshaft, 5... Counter shaft, 6... Trifle shaft, 7...・Mission cover, 8... Primano drive gear, 9... Primary driven gear, 1
0...Opening/closing clutch, 11...Clutch cover 1
2... Clutch chamber, 13... Drive gear train of the mission gear mechanism, 14... Driven gear train, 17...
Balancer shaft, 18... Balancer drive gear,
19... Balancer driven gear, 20.21... Oil pump, 23.24... Oil hole, 27...
Oil pipe, 30, 32. 34... Oil gear rally,
3]...Boss body, 33...Oil nozzle. Figure 3

Claims (1)

[Claims] 1. A crankshaft, a countershaft, and a drive shaft are mounted in parallel in a crankcase, and a clutch cover is attached to the outer surface of one side wall of the crankcase to form a clutch chamber. In the reduction gear mechanism in which a primary gear mechanism and an open/close clutch mechanism are interposed between the crankshaft protruding from the side and one end of the countershaft, and a mission gear mechanism is interposed between the countershaft and the drive shaft, On the outer surface of one side wall of the crankcase that forms the clutch chamber,
A boss body is formed whose tip extends close to the primary gear mechanism, an oil gallery is opened in the center of the boss body, and an oil nozzle directed toward the primary gear mechanism is opened at the tip, and the bearing portion of each shaft is connected to the oil gallery. A lubricating device for a reduction gear mechanism, characterized in that a lubricating oil supply system for supplying lubricating oil to a transmission gear mechanism is connected to an oil gallery in the boss body. 2. In a cassette-type reduction gear mechanism in which a part of the side wall of the crankcase on the side of the clutch chamber is formed by a removable mission cover into which the counter shaft, drive shaft, etc. can be inserted and removed as a unit, the clutch of this mission cover 2. The lubricating device for a reduction gear mechanism according to claim 1, wherein a boss body of the oil nozzle is integrally formed on the outer surface of the chamber. 3. An oil pipe with a large number of drip holes is installed along the upper part of the mesh between the drive gear train and the driven gear train of the mission gear mechanism, and one end of this oil pipe is connected to the oil gallery in the boss body of the oil nozzle. The lubricating device for a reduction gear mechanism according to claim 1, wherein the lubricating device is connected to an oil gallery on a side wall of the crankcase. 4. A balancer drive gear is pivotally supported on the crankshaft adjacent to the primary drive gear, and in meshing with the balancer driven gear on the balancer shaft, a part of the injected oil is also supplied to the balancer gear mechanism. 2. The lubricating device for a reduction gear mechanism according to claim 1, wherein the orientation direction of the oil nozzle is set to .