JP2003269587A - Oil supply device for shift gear of engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a miniaturizable oil supply device for the shift gear of an engine with saved weight of an oil shower pipe and reduced man-hours needed for the drilling operations of the pipe, while keeping the function of sufficiently supplying oil to each tooth surface of a shift gear group. <P>SOLUTION: In the oil supply device, both ends of the oil shower pipe 20 disposed in parallel with a shift input shaft 13, etc., are supported by pipe supporting holes 56, 57 formed in both end walls 40, 41 of a mission chamber, and one end is communicated with an oil passage 46 on the oil pump side. A plurality of spray nozzles 62, 63, 64, 65 opening to the tooth surface of a gear group G2, etc., are formed in the pipe 20. In the supporting hole 57 supporting the other end of the pipe 20, an oil groove 73 opening to the mission chamber 6 and supplying the oil to the tooth surface of a shift gear train 35L is formed. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission gear oil supply device for an engine, and more particularly, to an oil shower pipe arranged in parallel with a transmission shaft, with a spray port formed in the oil shower pipe facing a tooth surface of the transmission gear. The present invention relates to a transmission gear oil supply device for an engine, in which oil is sprayed.

[0002]

2. Description of the Related Art Oil is supplied to a transmission gear group of a transmission by an oil passage formed in the transmission shaft for a sliding portion between the transmission shaft and the transmission gear. Uses an oil mist that scatters and adheres from the oil reservoir. However, since there is little oil mist adhering to the tooth surface of the speed change gear that is located away from the oil sump, there is almost no oil mist in a dry sump engine. Oil is sprayed onto the tooth surface of the transmission gear from a plurality of spray ports formed in the pipe.

As a conventional technology having such an oil shower type oil supply structure, there is an oil supply device described in Japanese Utility Model Laid-Open No. Sho 53-26052, and a sectional view thereof is shown in FIG. In FIG. 6, an oil shower pipe 110 is arranged in parallel with the transmission shaft 104 in the mission chamber 101, and the left and right ends of the oil shower pipe 110 are provided with pipe support holes 105 formed in both end walls 102, 103 of the mission chamber. 1
It is supported by 06. The pipe support hole 105 on the left side closes the left end of the oil shower pipe 110, and the pipe support hole 10 on the right side is closed.
6 is an oil supply passage 11 in the right end wall 103 of the mission chamber
It communicates with the oil pump through 2.

In the middle of the oil shower tube 110, a plurality of spray ports 1 open toward the gear tooth surface of the transmission gear group G3.
13 is formed. The number and formation position of the spray ports 113 do not correspond to each gear train, and four spray ports 113 are formed for six transmission gear trains. By arranging between the rows, the spray port 113 is shared for a plurality of transmission gear rows.

[0005]

As shown in the structure of FIG.
By closing one end of the oil shower pipe 110, the transmission gear group G
If all the oil is supplied to the gear tooth surface of No. 3 by the spray from the spray port 113, the spray port 113 is also arranged on the gear tooth surface near both ends in the axial direction of the transmission shaft 104. From the necessity, the length of the oil shower pipe 110 is set long enough to extend over the gears at both ends in the axial direction. Further, although the spray port 113 at the axial end is shared for each of the plurality of gear trains, if it is attempted to supply sufficient oil to each gear tooth surface, the spray port 113 is provided for each gear train. The need arises.

That is, as the length of the oil shower tube 110 is increased, the weight is increased and the mission chamber itself is enlarged, and if the number of the spray ports 113 is increased to sufficiently supply the oil, the oil shower tube 110 is increased. The number of drilling process steps of 110 is increased, and the process becomes troublesome.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object thereof is to make an oil shower tube compact and lightweight while maintaining a function of sufficiently supplying each tooth surface of a transmission gear group. It is an object of the present invention to provide a transmission gear oil supply device for an engine, which can reduce the number of man-hours required for drilling an oil shower pipe.

[0008]

In order to solve the above-mentioned problems, the invention according to claim 1 of the present application is arranged such that an oil shower pipe is arranged in parallel with a transmission shaft in a mission chamber, and both ends of the oil shower pipe are connected to the mission. It is supported by pipe support holes formed in both end walls of the chamber in the direction of the transmission shaft axis, one end of the oil shower pipe communicates with the oil passage on the oil pump side, and in the middle of the oil shower pipe faces the tooth surface of the transmission gear. In a transmission gear oil supply device for an engine that has a plurality of spray openings that are opened, the pipe support hole that supports the other end of the oil shower pipe communicates with the oil shower pipe and opens in the mission chamber to change gears. An oil groove for supplying oil is formed on the tooth surface of the gear.

As a result, the length of the oil shower tube can be shortened and the number of spray ports can be reduced while sufficiently supplying oil to the tooth surfaces of each transmission gear train. Therefore, it is possible to reduce the weight and size, and the number of laborious machining steps for the small holes is reduced, so that the machining efficiency is improved.

According to a second aspect of the present invention, in the engine speed change gear oil supply device according to the first aspect, a boss is fixed to the other end of the oil shower pipe, and the boss is fitted into the pipe supporting hole.
The boss has an oil hole communicating between the inside of the oil shower pipe and the inside of the pipe support hole and also has an eccentric pin for positioning, and the eccentric pin is fitted into a positioning hole formed in the pipe support hole. Thus, each spray port is positioned in the circumferential direction.

As a result, when the oil shower pipe is assembled,
You can easily set the direction of the spray port to a predetermined direction,
Assembling work does not take time.

According to a third aspect of the present invention, in the transmission gear lubrication device for an engine according to the second aspect, a flange portion for guiding the oil discharged from the oil groove to the transmission gear train is formed integrally with the boss. There is.

As a result, the oil from the oil groove can be guided to the predetermined gear train without waste even without providing a new guide member.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION [Outline of Engine] FIG. 1 is a vertical sectional side view of a dry sump type single-cylinder four-cycle engine equipped with a transmission gear lubrication device according to the present invention. A crank chamber 2 for accommodating the balancer shaft 4 is formed, and a mission chamber 6 for accommodating a mission is formed at the rear of the crankcase 1. A partition wall 8 having a constant height is formed between the crank chamber 2 and the mission chamber 6, and the partition wall 8 serves to utilize the lower portion of the mission chamber 6 as an oil reservoir 10 isolated from the crank chamber 2. is there.

A transmission output shaft 12 is arranged in the rear of the transmission chamber 6, and a transmission input shaft 13 is arranged in parallel with the transmission output shaft 12 above a line A connecting the transmission output shaft core O3 and the crank shaft core O1. Is arranged, and the reverse idle shaft 14 is arranged slightly below the line A. O2 is a shift input shaft core, O4 is a reverse idle shaft core, and O5 is a balancer shaft core.

The transmission output shaft 12 has a transmission gear group G on the output side.
1 (only the reverse output gear 38 is shown in FIG. 1) is provided,
The speed change input shaft 13 has an input side speed change gear group G2 (reverse input gear 36 in FIG. 1) that meshes with the output side speed change gear group G1.
(Only displayed) is provided. A reverse idle gear 37 is provided on the reverse idle shaft 14.

The transmission output shaft 12 is provided at a position above the meshing portion between the output side transmission gear group G1 and the input side transmission gear group G2.
An oil shower tube 20 is arranged in parallel with the shift input shaft 13.

FIG. 2 is a sectional view taken along the line II-II of FIG. 1, and will be described below assuming that both sides of the shift shaft core direction (crank shaft core direction) are left and right when viewed from the rear of the engine. The crankcase 1 has a two-part structure with left and right crankcase members 1a and 1b. A generator cover 21 is fastened to the left side surface of the crankcase 1, and a clutch cover 22 is fastened to the right side surface. In the clutch chamber 23 covered with the cover 22, a multi-plate clutch 25 mounted on the right end of the shift input shaft 13 is housed.

As the input side transmission gear group G2, from the right side, the first speed gear 31, the fifth speed gear 35, the third speed gear 33,
A second speed gear 32, a fourth speed gear 34, and a reverse gear 36 are arranged, and an output side speed change gear group G meshing with each other.
1 (FIG. 1) and a combination with the reverse idle gear 37, etc., from the right side, the first speed transmission gear train 31L, the fifth
A speed shift gear train 35L, a third speed shift gear train 33L, a second speed shift gear train 32L, a fourth speed shift gear train 34L, and a reverse gear train 36L are configured.

The shift input shaft 13 is rotatably supported at its left and right end portions on the left and right end walls 40, 41 of the mission chamber 6 via bearings 43, 44, and has an oil passage 4 at its shaft core.
5 is formed, the left end of the oil passage 45 communicates with an oil supply passage 46 formed in the left end wall 40 of the mission chamber, and the oil supply passage 46 discharges the feed pump through an oil supply passage such as a pipe. Communicating with the department. In the middle of the oil passage 45 in the input side transmission shaft 13, an oil hole and the like extending radially outward to the fitting portion of the transmission gear group G2 and the fitting portion of the clutch gear 29 are formed.

In the right end wall 41 of the mission chamber, a portion 41a in which the oil shower pipe 20 is arranged projects to the inside (left side) of the mission chamber. In this embodiment, the projecting portion 41a is the second from the right. 5th speed change gear train 3
It extends to the position corresponding to 5L. This allows
The left-right space of the space where the oil shower pipe 20 is arranged is shorter than the left-right space of the space where the transmission input shaft 13 and the like are arranged, and the arrangement range of the oil shower pipe 20 is
The fifth from the position corresponding to the left bearing 43 of the speed change input shaft 13
It is up to a position near the speed change gear train 35L.

The left end portion of the oil shower pipe 20 is directly fitted and supported in a pipe support hole 56 formed in the left end wall 40 of the mission chamber, communicates with the oil supply passage 46 in the left end wall 40, and is connected to a feed pump. Oil is supplied from the left end into the oil shower pipe 20.

In the middle of the oil shower pipe 20, a position Pr corresponding to the reverse shift gear train 36, a position P4 corresponding to the fourth speed shift gear train 34L, and a position P2 corresponding to the second speed shift gear train 32. Further, four spray ports 66, 64, 62, 63 opening toward the tooth surface (meshing portion) of each transmission gear train are formed at a position P3 corresponding to the third speed transmission gear train 33.

FIG. 4 is a perspective view showing a state in which the right end portion of the oil shower tube 20 is removed from the right side tube support hole 57, and the right side tube support hole 57 is shown in a shape cut along a horizontal plane. In FIG. 4, a boss 58 having a flange portion 58a integrally formed on the right end portion of the oil shower tube 20.
Is fitted in, and the boss 58 is fitted in the pipe support hole 57 as described above. An oil hole 69 communicating with the oil shower tube 20 and penetrating in the left-right direction is formed in the boss 58, and the right end surface of the boss 58 is eccentric from the oil shower tube center line and protrudes to the right. An eccentric pin 70 for circumferential positioning is integrally formed. The outer periphery of the right end of the boss 58 is chamfered so that it can be easily inserted into the tube support hole 57.

On the other hand, the tube support hole 57 is a stepped hole having an annular step surface 57a, and a positioning hole 71 into which the eccentric pin 70 can be fitted is formed at the right end of the tube support hole 57. An oil groove 73 is formed at the lower end of the pipe support hole 57 and extends over the entire length of the pipe support hole 57 in the left-right direction.

FIG. 3 is an enlarged sectional view showing a state where the right end portion of the oil shower tube 20 is assembled, and the right end surface of the boss 58 is brought into contact with the step surface 57a of the tube support hole 57 to move in the left-right direction. Is regulated, which secures the oil chamber 57b on the right side of the boss 58 and secures the annular gap C between the flange portion 58a and the right end wall overhanging portion 41a. The oil chamber 57b communicates with the inside of the oil shower pipe 20 through the oil hole 69, and also communicates with the right end portion of the oil groove 73. The left end opening of the oil groove 73 faces the right end surface of the flange portion 58a with a gap C therebetween, and the oil discharged from the oil groove 73 is guided downward by the flange portion 58a.

[0027]

[Oil Flow of the Entire Engine] FIG. 5 is a block diagram showing the oil circulation system passage of the entire engine. The route indicated by the solid line is the supply side, and the route indicated by the virtual line is the return side. During engine operation, the oil sucked from the oil reservoir 10 to the feed pump 80 through the primary filter 81 passes through the secondary filter 82, the oil supply path 83 that goes to the crankshaft 3 side, and the oil supply path 84 that goes to the mission side. Divided into

The transmission oil supply path 84 on the mission side branches into the oil supply passage 86 on the cylinder head side in the middle, and then enters the oil supply passage 46 in the left end wall of the transmission chamber to enter the shift input shaft 13 and the shift output shaft 12. Is supplied into the oil shower pipe 20 and lubricates the fitting portion and the tooth surface of the transmission gear group.

The oil used for lubricating the crankshaft 3 and the connecting rod is supplied from the crank chamber 2 to the generator chamber 85.
The oil used for lubrication around the cylinder head is also returned to the generator chamber 85, pumped from the generator chamber 85 to the clutch chamber 23 by the scavenging pump 87 via the tertiary filter 86, and returned to the oil reservoir 10. Be done.

[Oil Supply by Oil Shower Pipe] In FIG. 2, the oil supplied from the oil supply passage 46 into the oil shower pipe 20 is the left four gear trains out of the six gear trains, that is, the four gear trains. Reverse gears, fourth gear, second gear, and third gear trains 36L, 34L,
For 32L and 33L, the corresponding spray port 6
Sprayed from 6, 64, 62, 63 toward each tooth surface (meshing portion) to lubricate each tooth surface.

The fifth speed transmission gear train 35L on the second surface from the right
3, the oil chamber 57b from the right end of the oil shower pipe 20 through the oil hole 69 of the boss 58 in FIG.
The oil flowing to the left side returns to the left through the oil groove 73 at the lower end, is guided downward by the flange portion 58a of the boss 58, and is dripped on the tooth surface (meshing portion) of the fifth speed transmission gear train 35L. , Adheres to the fifth speed transmission gear train 35L and lubricates it.

Oil mist flowing from the clutch chamber 23 on the right side through the right bearing 44 is attached to the first speed transmission gear train 31L on the right end, and the oil groove 7 is formed.
A part of the oil from 3 is the right end wall overhanging portion 41 of the mission.
It adheres along the lower surface of a and lubricates the tooth surface of the first speed transmission gear train 31L.

Transmission gear trains 36L, 34L, 32L, 3
The oil used to lubricate the tooth surfaces of 3L, 35L, 31L flows down or drops inside the mission chamber 6 and returns to the lower oil sump 10.

As described above, in this embodiment, the oil from the four spray ports 66, 64, 62, 63 of the oil shower tube 20 and the oil supplied from the oil groove 73 at the right end of the oil shower tube are used. Thus, sufficient oil can be supplied and lubricated individually to the six transmission gear trains. In addition, the oil shower tube 20 can be shortened and can be made light in weight, so that the mission chamber 6 can be made compact.

[0035]

[Other Embodiments of the Invention] (1) In the embodiment of FIG. 2, of the six transmission gear trains, four transmission gear trains are lubricated using oil from the spray port of the oil shower pipe. There are, for example, five spray ports for an oil shower tube, and 5 rows from the left side are lubricated with spray oil,
It is also possible that the right end boss is located above the right end transmission gear train and only the right end transmission gear train is lubricated by the dripping oil from the oil groove.

[0036]

As described above, according to the present invention, (1) oil is sprayed from an oil shower tube provided in parallel with a transmission shaft such as a transmission input shaft toward a meshing portion of a transmission gear train. Therefore, oil can be supplied to the tooth surface immediately before the teeth of the transmission gear mesh with each other, and a sufficient oil film can be efficiently supplied.

(2) In the pipe supporting hole for supporting the other end of the oil shower pipe, an oil groove communicating with the oil shower pipe and opening to the mission chamber to supply oil to the tooth surface of the transmission gear train is formed. Therefore, the length of the oil shower tube can be shortened and the number of spray ports can be reduced while supplying sufficient oil for each transmission gear train. This makes it possible to reduce the weight and size, reduce the laborious machining process of small holes, and improve the machining efficiency.

(3) A boss is fixed to the other end of the oil shower pipe, and the boss is fitted in the pipe supporting hole, and the boss has an oil hole for communicating the inside of the oil shower pipe with the inside of the pipe supporting hole. It has an eccentric pin for positioning, and by fitting the eccentric pin into a positioning hole formed in the pipe support hole, the spray port is positioned so as to face in a predetermined direction. When assembling the shower tube, the direction of the spray port can be easily set to a predetermined direction, and the assembling work becomes easy.

(4) If the flange that guides the oil discharged from the oil groove to the transmission gear train is formed integrally with the boss, the oil groove can be formed in a predetermined transmission gear train without providing a new guide member. The oil from can be guided without waste.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view (corresponding to II cross section of FIG. 2) of a 4-cycle engine to which the present invention is applied.

FIG. 2 is a sectional development view taken along line II-II of FIG.

FIG. 3 is an enlarged cross-sectional view near the right end of the oil shower tube.

FIG. 4 is a perspective view showing a state where the right end portion of the oil shower tube is removed from the tube support hole.

FIG. 5 is a block diagram showing an oil flow of the entire engine.

FIG. 6 is a vertical sectional view of a conventional example.

[Explanation of symbols]

1 Crank Case 2 Crank Chamber 3 Crank Shaft 6 Mission Chamber 10 Oil Reservoir 12 Speed Change Output Shaft 13 Speed Change Input Shaft 20 Oil Shower Tube 40 Mission Room Left End Wall 41 Mission Room Right End Wall 41a Right End Wall Projection 56 Tube Support Hole 57 Tube Support Hole 58 Boss 58a Flange 62, 63, 64, 66 Spray port 69 Oil hole 70 Eccentric pin 71 Positioning hole 73 Oil groove G1, G2 Shift gear group 31L, 32L, 33L, 34L, 35L, 36L Shift gear train

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Claims (3)

[Claims] 1. An oil shower pipe is arranged in the transmission chamber in parallel with a speed change shaft, and both ends of the oil shower pipe are
The transmission chamber is supported by pipe support holes formed on both end walls in the axial direction of the transmission shaft, one end of the oil shower pipe communicates with the oil passage on the oil pump side, and the tooth surface of the transmission gear is provided in the middle of the oil shower pipe. In a transmission gear oil supply device for an engine in which a plurality of spray ports that open toward each other are formed, a pipe support hole that supports the other end of the oil shower pipe communicates with the inside of the oil shower pipe and opens into the mission chamber. An engine speed change gear oil supply device, characterized in that an oil groove for supplying oil is formed on a tooth surface of the speed change gear. 2. The transmission gear oil supply device for an engine according to claim 1, wherein a boss is fixed to the other end of the oil shower pipe, and the boss is fitted in a pipe support hole, and the boss is inside the oil shower pipe. It has an oil hole communicating with the inside of the pipe support hole and an eccentric pin for positioning. By fitting the eccentric pin into a positioning hole formed in the pipe support hole, each spray port is circumferentially arranged. A gearshift oil supply device for an engine, characterized in that it is positioned at. 3. The engine speed change gear oil supply device according to claim 2, wherein the boss is integrally formed with a flange portion for guiding the oil discharged from the oil groove to the tooth surface of the speed change gear. The engine shift gear lubrication device.