JPH07293674A - Lubrication mechanism of transmission - Google Patents

Abstract

PURPOSE:To provide a lubrication mechanism of a transmission which can supply lubricating oil effectively to sections which require lubrication by a minimum amount of oil, enables the manufacture of members for the lubrication at low cost, and facilitates the assembly work. CONSTITUTION:A groove portion 13 in the shape of arc is formed in the vicinity of a bearing 4 on one hand on an inner wall surface of a casing 2, and a depression 13a is formed in the direction of radius in the groove portion 13. An oil receiver 14 is fitted in the groove portion 13. The oil receiver 14 consists of a partition plate 15 like disc which has outer diameter equal to or slightly larger than inner diameter of the groove portion 13 and a circular hole 15a at the center thereof, a positioning piece 15b which is provided and protrudes in an peripheral fringe section of the partition plate 15 in correspondence to two depressions 13a, a pipe portion 16 which is provided and protrudes around the hole 15a on the inner side of the partition plate 15, and a receiver portion 17 in the shape of character V in which a bottom surface is provided and protrudes along a circle of a bottom of the hole 15a on the outside of the partition plate 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a lubrication mechanism mainly for a transmission of a vehicle such as a four-wheeled vehicle and a two-wheeled vehicle.

[0002]

2. Description of the Related Art In a transmission, a transmission gear supported around an input shaft and an output shaft is accommodated in a mission casing in order to improve meshing and prevent seizure with the shaft. Circulating lubricating oil. For meshing gears, the lubricating oil in the casing is splashed and supplied, but between the gear and the shaft surface for shifting that is supported around the shaft (for example, the input shaft) arranged in the upper part of the casing. Generally, an opening is provided at the center of one end of the shaft, and the lubricating oil is generally guided and supplied from the opening into the central oil passage of the shaft.

The prior art of this type of lubrication mechanism is disclosed in Japanese Utility Model Publication No. 6
There are those described in Japanese Patent Publication No. 4-29565 and Japanese Utility Model Publication No. 62-31724. In the former, as shown in FIG. 6, one end of the counter shaft 31 located below the oil level is attached to the casing 3
2 is rotatably supported by a bearing 34, a central oil passage 36 is formed in the axial direction from one end opening of the counter shaft 31, and a funnel 37 having an oil guiding pipe portion 38 fitted and inserted in the one end opening is provided. The oil passage 35 is fixed in the casing 32 and has an oil passage 35 for introducing lubricating oil from the outside of the funnel 32 into the central oil passage 36 via the oil guiding pipe portion 38.
Reference numeral 33 in FIG. 6 is a speed change gear, and 39 is a branch oil passage communicating from the central oil passage 36 to the outer circumference of the counter shaft 31. In the latter case, as shown in FIG.
The pipe part 47 of the oil channel 46 having the same structure as
The input shaft (input shaft) 43 located in the upper part of the casing 41 is inserted into the central oil passage 44 through one end opening, and the oil channel 46 is positioned by the outer race 45a of the bearing 45 that supports one end of the input shaft 43. This is done on the inner peripheral surface and the end surface. Therefore, in addition to the flange portion 48 that abuts on the end surface of the outer race 45a via the shim 42, the oil channel 46 projects inward from the flange portion 48 and the outer race 45a. An engaging portion 49 that fits on the inner peripheral surface of the is provided.

[0004]

However, the lubrication mechanism described in the above publication has the following disadvantages.

In both cases, the lubricating oil flows into the central oil passage only after it has accumulated in the space between the casing and the vicinity of the center line of the shaft (counter shaft 31 or input shaft 43). Therefore, it takes time for the lubricating oil to flow into the center oil passage of the shaft, and in the state before the lubricating oil flows into the center oil passage of the shaft, insufficient lubrication causes rattling noise (rattle noise). (Also called noise) may occur.

[0006] In both cases, the action of lubricating oil flowing into the central oil passage of the shaft is natural inflow, that is, due to static pressure, the inflow speed is slow, and therefore the amount of inflowing oil becomes unstable, sometimes resulting in insufficient lubrication and There may be noise.

Since both of them, that is, the funnel and the oil channel are respectively formed by sheet metal, if a member for guiding the lubricating oil is added, for example, it is necessary to manufacture and weld the guide member separately. Therefore, the production cost is considerably high.

The present invention has been made in view of the above points, and provides a lubricating mechanism for a transmission, which is capable of uniformly supplying lubricating oil to a portion requiring lubrication with a minimum amount of lubricating oil and which is easy to assemble. Is intended.

[0009]

In order to achieve the above object, a lubricating mechanism for a transmission according to the present invention comprises: a) a casing in which a predetermined amount of lubricating oil is stored, and between the casing and the outer peripheral surface of the shaft. It is rotatably supported by an intervening bearing,
An opening is formed at the center of one end of a shaft that supports the speed change gear on the outer periphery of the intermediate portion, and a central oil passage that is continuous with this opening and a radial branch oil passage that is continuous with this central oil passage and communicates with the outer periphery is provided In the lubrication mechanism of the transmission, which guides the lubricating oil splashed in the casing from the one end opening of the shaft through the oil receiver into the central oil passage to supply the lubricating oil, b) the oil receiver A plate-shaped partition plate, a pipe part that projects inward from the periphery of a hole opened in the center of the partition plate, and is inserted into the central oil passage, and projects outwardly into the hole of the partition plate. C) an inner wall surface of the casing, which is composed of a V-shaped, U-shaped, etc. receiver portion that is widened upwards on both sides and a positioning piece that projects radially and inwardly on the outer peripheral edge of the partition plate. A groove is formed in an arc shape near the bearing In addition, a recess is formed in a part of the groove portion in the radially outward direction, and d) by fitting the outer peripheral edge of the partition plate in the groove portion, in the radial direction, and in the recess, the positioning piece. To position the oil receiver in the circumferential direction and in the axial direction by bringing the positioning piece into contact with the outer race end surface of the bearing.

As described in claim 2, e) it is preferable that the oil receiver is integrally molded with a synthetic resin.

It is more preferable that the bottom surface of the receiver portion of the oil receiver is inclined downward toward the hole of the partition plate.

[0012]

According to the lubricating mechanism for a transmission of the present invention having the above-mentioned structure, the lubricating oil in the casing is introduced into the central oil passage of the shaft and is supplied to the outer periphery of the shaft as follows. That is, the lubricating oil stored in the lower portion of the casing is splashed upward by the rotation of the transmission gear,
It hits the upper surface of the casing and falls on the gear for speed change. A part of the lubricating oil thus dropped falls on the oil receiver at one end of the shaft and is received by the V-shaped or U-shaped receiver portion. Immediately with the momentum that dropped, it flows into the central oil passage from one end opening of the shaft, is supplied to the outer circumference of the shaft through the oil passage in the radial direction, and the transmission gear supported on the outer circumference and the shaft outer circumference. Lubricate the surfaces. Therefore, only by storing a relatively small amount of lubricating oil in the casing, the lubricating oil is effectively guided to the oil passage in the shaft, and rattling noise due to insufficient lubrication is reduced.

On the other hand, when assembling the transmission, the oil receiver can be easily attached by fitting the partition plate of the oil receiver into the arcuate groove on the inner wall surface of the casing. When the oil receiver is fitted into the groove, it is positioned circumferentially by fitting the positioning piece of the oil receiver into the recess of the groove, and the oil is attached to the outer race end surface of the bearing (at one end of the shaft). The positioning piece of the receiver comes into contact with the positioning piece in the axial direction. Since the groove is arcuate and the partition plate is circular, positioning in the radial direction is performed only by fitting. Since the oil receiver can be positioned in all directions in this way, the oil receiver can be mounted in the casing in advance, so that the transmission can be easily assembled.

Furthermore, since the oil receiver is positioned in all directions in the casing as described above, the pipe portion of the oil receiver inserted into the central oil passage of the shaft should not come into contact with the inner peripheral surface of the central oil passage. Can be held at.

In the lubricating mechanism of the transmission according to the second aspect of the present invention, since the oil receiver can be made lighter and the synthetic resin itself has elasticity, for example, the oil receiver can be made slightly larger and the casing If it fits in the groove without any gaps, the mounting will be more reliable and will not loosen even after long-term use. Further, as compared with the case where the sheet metal is used, the manufacturing is easy and the cost can be reduced.

In the lubricating mechanism of the transmission according to the present invention, even if a small amount of lubricating oil is received by the receiver, the lubricating oil flows into the central oil passage from one end opening of the shaft along the inclined bottom surface thereof. .

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a lubricating mechanism for a transmission according to the present invention will be described below with reference to the drawings. 1 is a front view showing an embodiment of an oil receiver, FIG. 2 is a sectional view taken along the line II-II in FIG. 1, and FIG. 3 is a view showing an end portion of the transmission with the oil receiver shown in FIG. III-III line arrow view, FIG. 4 is an IV-IV line sectional view of FIG. 3 showing the end of the transmission with the oil receiver of FIG. 1 mounted, and FIG. 5 is a VV line sectional view of FIG. Is.

As shown in FIGS. 3 and 4, the transmission 1 is integrally provided with a differential gear (not shown) at a lower portion thereof, and a main shaft 3 is rotatably provided at an upper portion of a casing 2. The main shaft 3 has one end and an intermediate position thereof rotatably supported by bearings 4 and 5, respectively. Around the main shaft 3, between the bearings 4 and 5, there are provided speed change gears 6 and 7 and a selector sleeve 8 arranged so as to straddle these gears 6 and 7. A selector 9 is disposed above the main shaft 3 in the casing 2, and the selector sleeve 8 is configured to be selectively movable left and right. In addition, the selector sleeve 8 and each gear 6 and 7
Synchronizers 8a are respectively interposed between them.

On one end side of the main shaft 3 in the casing 2, a space 2b is provided between the end surface of the main shaft 3 and the casing inner wall surface 2a which faces the main shaft 3. An opening 10 is provided in the center of one end of the main shaft 3 on the side facing the space 2b, and a central oil passage 11 is continuously formed in the opening 10 along the central axis of the main shaft 3. Further, a plurality of branch oil passages 12 are bored in the radial direction (radially) from the central oil passage 11 toward the outer peripheral surface supporting the gears 6 and 7.

A groove portion 13 is formed in an arc shape (in this example, an arc angle of about 260 °) in the inner wall surface of the casing 2 near one of the bearings 4 as shown in FIGS. There are two circumferentially spaced recesses 13
a is formed in the radial direction. The oil receiver 14 is fitted into the groove portion 13.
4 has the following configuration.

That is, as shown in FIGS. 1 and 2, a disk-shaped partition having an outer diameter equal to or slightly larger than the inner diameter of the groove portion 13 (FIG. 3) and having a circular hole 15a formed in the center thereof. A plate 15 and a positioning piece 15b projecting from the peripheral edge of the partition plate 15 corresponding to the two recesses 13a (FIG. 3);
A pipe part 16 projecting around a hole 15a inside the partition plate 15, and a substantially V-shaped receiver (see FIG. 1) projecting a bottom surface on the outside of the partition plate 15 along the bottom circular shape of the hole 15a. Part 17 and an oil-resistant synthetic resin (for example,
Nylon resin, especially nylon 66 is preferable) and is integrally molded. When the transmission 1 is assembled, the oil receiver 14 is fitted into the groove portion 13 with the protruding side of the positioning piece 15b facing the bearing 4 side as shown in FIGS.
5 is attached, the pipe portion 16 is inserted into the central oil passage 11 from the opening 10 of the main shaft 3, and the main shaft 3
Attach. At this time, as shown in FIG.
The positioning is performed in all directions (circumferential direction, radial direction, axial direction) simply by fitting one positioning piece 15b. In addition,
The positioning piece 15b contacts the outer race 4a of the bearing 4 as shown in FIG.

As described above, the oil receiver 14 is installed in the casing 2 in advance, and the bearings 4 and 5 are attached.
The transmission 1 is assembled by incorporating the main shaft 3 and the like. In the transmission 1 of this example, a differential gear (not shown) is incorporated in the lower portion of the casing 2, but the lubricating oil is injected to such an extent that the differential gear is half immersed. Then, as the differential gear rotates, the lubricating oil is splashed upward in the casing 2, and a part of the lubricating oil falls into the space 2b of the casing 2. At this time, the oil receiver 14
Lubricating oil is received by the receiver portion 17 that spreads upward on both sides, and when the lubricant oil is collected on the receiver portion 17 to some extent, it flows into the central oil passage 11 of the main shaft 3 through the hole 15a and the pipe portion 16. In particular, if the bottom surface of the receiver portion 17 is inclined downward toward the hole 15a, the lubricating oil on the receiver portion 17 flows into the central oil passage 11 even if the stored amount is small. Thus, the central oil passage 11
The lubricating oil that has flowed in is supplied between the outer periphery of the main shaft 3 and the speed change gears 6 and 7 through the branch oil passage 12 due to the centrifugal force when the main shaft 3 rotates.

Although one embodiment of the lubrication mechanism of the transmission has been described above, the present invention can be carried out as follows.

(1) Each component of the oil receiver 14, that is, the partition plate 15, the positioning piece 15b, the pipe portion 1
6. The receiver portion 17 is made of sheet metal and fixed by welding to form the oil receiver 14.

(2) The receiver portion 17 is not limited to the substantially V shape or U shape as long as it has a shape for receiving the falling lubricating oil, that is, a shape that spreads upward on both sides.

(3) The oil receiver 14 is effective regardless of the type as long as it is a shaft arranged in the upper part of the casing 2, but an output shaft and a counter shaft normally arranged in the middle part of the casing 2. Can also be applied to.

(4) Needless to say, the present invention can also be applied to a transmission of the type in which the differential gear is not integrally provided in the casing 2.

[0028]

As is apparent from the above description,
The lubrication mechanism of the transmission of the present invention has the following effects.

1) If the lubricating oil splashed by the rotation of the gear falls on the oil receiver, it immediately flows into the oil passage from the one end opening of the shaft with the momentum of the fall. The rattling noise due to is reduced. Moreover, since the oil receiver can be installed in the casing in advance, the transmission can be easily assembled.

In the lubrication mechanism of the transmission according to the second aspect, 2) the fitting into the groove portion is easy and the mounting can be ensured,
It does not come off even after long-term use. In addition, it is easier and cheaper to manufacture than the case of using sheet metal.

In the lubricating mechanism of the transmission according to the third aspect of the invention, 3) even if a small amount of lubricating oil is received by the receiver, it efficiently flows into the central oil passage of the shaft.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of an oil receiver used for a lubrication mechanism of a transmission according to the present invention.

2 is a sectional view of the oil receiver of FIG. 1 taken along line II-II.

3 is a view taken along the line III-III in FIG. 4 showing the end of the transmission with the oil receiver shown in FIG. 1 attached.

4 is a cross-sectional view taken along line IV-IV of FIG. 3, showing an end of the transmission with the oil receiver of FIG. 1 attached.

5 is a sectional view taken along line VV of the transmission shown in FIG.

FIG. 6 is a cross-sectional view showing an example of a conventional transmission lubrication mechanism.

FIG. 7 is a cross-sectional view showing another example of a conventional transmission lubrication mechanism.

[Explanation of symbols]

 1 Transmission 2 Casing 3 Main Shaft 4/5 Bearings 6/7 Transmission Gear 10 Opening 11 Central Oil Path 12 Branch Oil Path 13 Groove 13a Recess 14 Oil Receiver 15 Partition Plate 15a Hole 15b Positioning Piece 16 Pipe 17 17 Receiver

Claims (3)

[Claims] 1. A shaft which is rotatably supported by a bearing interposed between the casing and the outer peripheral surface of the shaft in a casing in which a predetermined amount of lubricating oil is stored, and which supports a transmission gear on the outer periphery of an intermediate portion. A central oil passage that opens at one end of the central oil passage, and a radial branch oil passage that communicates with the outer circumference that is continuous with the central oil passage and that has a lubricating oil splashed in the casing. In a lubrication mechanism of a transmission, which guides the lubricating oil from the one end opening of the shaft through an oil receiver into the central oil passage, the oil receiver is provided in a disc-shaped partition plate and a central portion of the partition plate. A pipe portion protruding inward from the periphery of the opened hole and inserted into the central oil passage, and a pipe portion protruding outward in the hole of the partition plate above both sides such as a V shape and a U shape. Expanded receiver part and the partition It is composed of a positioning piece that projects radially and inwardly on the outer peripheral edge of the plate, and a groove is formed in an arc shape in the vicinity of the bearing on the inner wall surface of the casing, and a radius is formed in a part of this groove. Forming a recess outward in the direction, by fitting the outer peripheral edge of the partition plate into the groove, in the radial direction, and by fitting the positioning piece in the recess, in the circumferential direction, A lubrication mechanism for a transmission, wherein the oil receivers are axially positioned by bringing the positioning pieces into contact with an outer race end surface of the bearing. 2. The lubrication mechanism for a transmission according to claim 1, wherein the oil receiver is integrally molded of synthetic resin. 3. A lubricating mechanism for a transmission according to claim 1, wherein a bottom surface of the receiver portion of the oil receiver is inclined downward toward the hole of the partition plate.