JP2010236596A - Transmission - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transmission in which the intake efficiency and durability of an oil pump is improved by preventing lubricating oil mixed with an air bubble in an oil pan from being sucked by an oil pump via an oil filter. <P>SOLUTION: A filter storing chamber 37 is provided inside the sidewall 1a of a gear case 2 lateral to the oil pan 36 so as to communicate with the oil pan 36 via an oil suction pipe 45. An oil filter 38 is stored in the filter storing chamber 37. A partition plate 42 is provided in an inner space at a lower part of the oil pan 36 and the gear case 2 to separate a gear 25 disposed directly over the oil pan 36 from the suction port 45a of the lubricating oil of the oil suction pipe 45. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a transmission in which lubricating oil in an oil pan is sucked by an oil pump through an oil filter.

  In transmissions of special vehicles for industrial use and construction use, as described in Patent Document 1, for example, in an oil pan below a gear case in which a hydraulic shift multi-plate clutch and gears are accommodated The oil is sucked by an oil pump provided in the hydraulic circuit through an oil filter (suction filter) that is stored horizontally on the bottom of the oil pan and supplied to the multi-plate clutch in the transmission, or each part is lubricated. There are things that I try to do.

JP 2006-275136 A

When the gear is disposed directly above the oil pan as in the transmission described in Patent Document 1, when the vehicle equipped with the transmission is tilted on a slope or the like, the lubricating oil in the oil pan is The oil level rises and may be agitated by the gear above it.
In this case, bubbles are mixed into the lubricating oil, and the lubricating oil mixed with the bubbles is sucked in by the oil pump through the oil filter housed in the oil pan, thereby reducing the suction efficiency and durability of the oil pump. There is a fear.

In order to prevent such a problem from occurring, in order to eliminate the influence of the lubricating oil stirring by the gear, for example, a filter housing chamber facing in the left-right direction is arranged in parallel in the gear case on the side of the oil pan. It is conceivable that lubricating oil in the oil pan is caused to flow into an oil filter accommodated horizontally in the filter housing chamber through an oil supply hole for communicating the filter housing chamber and the oil pan.
However, if this is done, the left and right dimensions of the gear case will be large and the transmission will be large, so it is necessary to secure a large space in the transmission mounting portion of the vehicle, and the degree of freedom in designing the transmission mounting vehicle is also increased. Get smaller.

  The present invention has been made in view of the above problems, and by preventing the lubricating oil mixed with bubbles in the oil pan from being sucked by the oil pump through the oil filter, the suction efficiency of the oil pump is improved. An object of the present invention is to provide a transmission that can improve durability and that can reduce the size of a gear case.

According to the present invention, the above-mentioned problems are solved as follows.
(1) The rotation of the input shaft housed in a gear case having an oil pan at the lower part and driven by being linked to an engine or the like is transmitted to the output shaft through a plurality of power transmission means comprising gears or the like. In the transmission configured to suck the lubricating oil in the oil pan with an oil pump through an oil filter, and recirculate the sucked lubricating oil after lubricating each member in the gear case. A filter housing chamber is provided in a side wall of the gear case at a side of the oil pan so as to communicate with the oil pan through an oil absorption pipe, the oil filter is housed in the filter housing chamber, and the oil pan In the inner space below the gear case, the gear in the power transmission means disposed immediately above the oil pan and the lubricating oil suction port of the oil suction pipe are isolated from each other Providing a Setsuban.

  With such a configuration, the gear in the power transmission means disposed immediately above the oil pan and the inlet of the lubricating oil in the oil absorption pipe are separated by the partition plate, so that the lubricating oil in the oil pan is Even if agitation is performed by the gear, the risk that the lubricating oil mixed with bubbles is sucked by the oil pump through the oil absorption pipe and the oil filter is extremely reduced. Therefore, the suction efficiency and durability of the oil pump are not reduced.

(2) In the above item (1), the oil absorption pipe extends through the partition plate to the middle part of the oil pan.

  With such a configuration, since the suction port of the lubricating oil in the oil absorption pipe is moved away from the gear, the possibility that the lubricating oil mixed with bubbles is sucked by the oil absorption pipe is further reduced.

(3) In the above item (1) or (2), the filter storage chamber is provided so as to face in the vertical direction, and the oil filter is stored in the filter storage chamber in the vertical direction.

  With such a configuration, the lateral dimension (left and right direction) of the gear case is reduced and the size is reduced, so that the entire transmission is also reduced in size and the degree of freedom in designing the transmission-equipped vehicle is increased.

(4) In the above item (1) or (2), the filter storage chamber is provided so as to face the direction orthogonal to the input shaft, and the oil filter is stored substantially horizontally in the filter storage chamber.

  With such a configuration, as in the above item (3), the size of the gear case in the lateral direction (left-right direction) is reduced, so that the gear case can be reduced in size.

(5) In any one of the above items (1) to (4), the suction hole of the oil suction pipe is directed downward so as to face the bottom of the oil pan.

  With such a configuration, the bubbles mixed in the lubricating oil rise toward the oil surface, and therefore the risk that the lubricating oil mixed with the bubbles is sucked from the suction port of the oil suction pipe directed downward is extremely small.

  According to the present invention, the gear in the power transmission means disposed immediately above the oil pan and the intake port for the lubricating oil in the oil absorption pipe are separated by the partition plate, so that the lubricating oil in the oil pan is in the gear. Even if agitation is performed, the risk that the lubricating oil mixed with bubbles is sucked by the oil pump through the oil absorption pipe and the oil filter is extremely reduced. Therefore, the suction efficiency and durability of the oil pump are not reduced.

It is a right view of the transmission to which this invention is applied. It is an enlarged vertical front view along the II-II line of FIG. Similarly, it is an expanded sectional view of the principal part of FIG. It is an expanded sectional view of the important section showing the modification of the transmission of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a side view of a transmission of a vehicle such as a forklift to which the present invention is applied, and FIG. 2 is a longitudinal front view taken along line II-II in FIG. In the following description, the left and right are referred to in FIG. This transmission is formed adjacent to the main gear case 2 whose left end opening is closed by the housing 1a on the right side of the torque converter unit 1, and the upper right side surface of the main gear case 2, and has an opening at the outer end. And an auxiliary gear case 4 whose surface is closed by a cover-like end plate 3. The housing 1a also serves as the left side wall of the main gear case 2.

The torque converter unit 1 is connected to a crankshaft of an engine (not shown), and when the driving force of the engine is transmitted to an internal turbine (not shown), the input shaft 5 that faces the left and right directions with the left end linked to the turbine. Can be rotated.
The input shaft 5 extends into the main gear case 2, and its right end is freely rotatable via a bearing 6 on the right side wall of the main gear case 2, that is, the partition wall 2 a that partitions the main gear case 2 and the sub gear case 4. It is supported by.

  Inside the main gear case 2, a hydraulic multi-plate first speed clutch 7 and a hydraulic multi-plate second speed clutch 8 are attached to the input shaft 5.

On the left side of the first speed clutch 7, a first speed clutch gear 9 located in the housing 1 a is rotatably fitted to the input shaft 5 via a bearing 10. A second speed clutch gear 11 having a diameter larger than that of the first speed clutch gear 9 is rotatably fitted to the input shaft 5 on the right side of the second speed clutch 8 via a bearing 10. ing. The first speed clutch gear 9 and the second speed clutch gear 11 rotate together with the input shaft 5 when the first speed clutch 7 and the second speed clutch 8 are selectively connected, respectively.
A reverse input gear 12 is fixedly fitted to the input shaft 5 on the right side of the second speed clutch gear 11.

  The sub-gear case 4 accommodates an output shaft 13 that is arranged on the same axis line as the input shaft 5 and whose right side portion protrudes outward from the end plate 3. The output shaft 13 is a partition wall via bearings 14, 14. 2a and the end plate 3 are rotatably supported. In the auxiliary gear case 4, an output gear 15 is fixedly fitted to the output shaft 13.

  Below the input shaft 5, an intermediate shaft 16 that is parallel to the input shaft 5 is accommodated in the main gear case 2 with the right end portion protruding into the auxiliary gear case 4. The left and right ends of the intermediate shaft 16 are rotatably supported by the housing 1a and the end plate 3 of the auxiliary gear case 4 via bearings 17 and 17, respectively.

A first intermediate gear 18 and a second intermediate gear 19 are fixedly fitted to the left end portion and the intermediate portion of the intermediate shaft 16, respectively. The first intermediate gear 18 and the second intermediate gear 19 are respectively used for the first speed. The clutch gear 9 meshes with the second speed clutch gear 11.
An input gear 20 that meshes with the output gear 15 is fixed to the right end of the intermediate shaft 16.

  By the first and second speed clutches 7 and 8, the first and second speed clutch gears 9 and 11, the intermediate shaft 16, the first and second intermediate gears 18 and 19, the input gear 20, and the output gear 15, etc. A power transmission means for forward movement is configured.

  A counter shaft 21 is accommodated in the main gear case 2 so as to be parallel to the intermediate shaft 16 below the input shaft 5 and slightly obliquely in front of the intermediate shaft 16. (The left one is not shown) and are rotatably supported by the housing 1a and the partition wall 2a, respectively.

  An intermediate portion of the counter shaft 21 is provided with a hydraulic multi-plate reverse clutch 23 and a reverse clutch gear 24, and the reverse clutch gear 24 meshes with the reverse input gear 12. The input shaft 5, the intermediate shaft 16, and the counter shaft 21 are arranged as shown in FIG. 1 in a side view, and FIG. 2 is a sectional view taken along the line II-II in FIG. In the figure, the reverse clutch gear 24 and the reverse gear 12 are illustrated as being separated from each other, but actually they are meshed with each other.

A reverse output gear 25 is fixedly fitted to the left end portion of the counter shaft 21, and the reverse output gear 25 meshes with the first intermediate gear 18.
The reverse input gear 12, counter shaft 21, reverse clutch 23, reverse clutch gear 24, reverse output gear 25, and the like constitute reverse power transmission means.

  When pressure oil is selectively supplied to the first speed clutch 7 and the second speed clutch 8 and any one of them is connected, the first speed clutch gear 9 and the second speed clutch gear 11 Any one of the first intermediate gear 18 and the second intermediate gear 19 engaged therewith is rotated. As a result, the intermediate shaft 16 and the input gear 20 and the output gear 15 meshing with the input gear 20 are rotated, and the driving force of the torque converter unit 1 is transmitted to the output shaft 13.

  On the other hand, when pressure oil is supplied to the reverse clutch 23 and connected thereto, the counter shaft 21 and the reverse output gear 25 are rotated via the reverse clutch gear 24 meshed with the reverse input gear 12. The first intermediate gear 18 and the intermediate shaft 16 meshing with the reverse output gear 25 rotate in the opposite direction. As a result, the output gear 15 and the output shaft 13 meshing with the input gear 20 rotate in the reverse direction, and the vehicle moves backward.

Inside the input shaft 5 described above, an oil passage (not shown) for supplying high pressure hydraulic oil to the first speed clutch 7 and the second speed clutch 8, and pressure oil is supplied to these clutch disks. And an oil passage 26 for lubricating the oil passage 26 is formed along the axial direction. The oil passage 26 is formed up to the vicinity of the first speed clutch 7 so as to open to the right side of the input shaft 5. Yes.
As shown in an enlarged view in FIG. 3, an oil chamber 27 that is coaxial with the input shaft 5 is provided in the partition wall 2 a that supports the right end of the input shaft 5 in the main gear case 2. The oil chamber 27 is formed so as to communicate with the oil chamber 27 so that pressure oil (lubricating oil) is supplied from a hydraulic circuit outside the transmission (not shown) via a hydraulic circuit 28 provided in the partition wall 2a. It has become.

As shown in FIG. 2, an oil chamber 29 is also formed in the partition wall 2a at a position facing the shaft end of the counter shaft 21, and the oil chamber 29 is interposed via an oil passage 30 in the vertical direction provided in the partition wall 2a. The oil chamber 27 communicates with the oil chamber 27.
The counter shaft 21 is formed with an oil passage 31 that opens to the right and faces the axial direction so as to communicate with the oil chamber 29. Pressure oil introduced from the oil chamber 27 into the oil chamber 29 is supplied to the counter shaft 21. As a result, the clutch disk of the reverse clutch 23 is lubricated.

In the central portion of the output shaft 13, the left end facing the input shaft 5 is open, and the first oil passage 32 whose diameter is enlarged is opposed to the oil chamber 27 in the axial direction. It is formed to the middle part.
Further, an end plate is provided at the intermediate portion of the output shaft 13 so that the second oil passage 33 that opens in the outer peripheral surface of the output shaft 13 in the radial direction communicates with the right end portion of the first oil passage 32. 3 is formed so as to open into the sub-gear case 4 through a gap 34 formed between the opposed surfaces of the outer bearing 15 and the output gear 15 at a position close to the inner side surface. The inner diameter of the second oil passage 33 is smaller than that of the first oil passage 32.

  An oil guide hole 35 that is coaxial with the input shaft 5, the output shaft 13, and the first oil passage 32 of the output shaft 13 is formed at the opposite portion of the partition wall 2 a between the oil chamber 27 and the first oil passage 32. The opening end of the outer surface of the partition wall 2 a is drilled so as to be close to the opening end of the first oil passage 32. The diameter of the oil guide hole 35 is considerably smaller than that of the first oil passage 32 (for example, about 1/3), and the lubricating oil (pressure oil) supplied to the oil chamber 27 is supplied to the oil guide hole 35. Further, the fuel is reliably and vigorously injected toward the first oil passage 32.

  The lubricating oil pressurized and supplied to the oil chamber 27 is introduced into the oil passage 26 of the input shaft 5 as shown by the arrow in FIG. 3, and the clutch disks of the first and second speed clutches 7 and 8 are used. While being lubricated, the oil is injected vigorously from the oil guide hole 35 toward the first oil passage 32 of the output shaft 13. At this time, since the first oil passage 32 and the oil guide hole 35 are coaxial with each other, the lubricating oil is injected straight into the first oil passage 32 through the oil guide hole 35 without resistance.

  Lubricating oil injected into the first oil passage 32 is discharged into the auxiliary gear case 4 through the second oil passage 33 in the radial direction and the gap 34 between the opposing surfaces of the outer bearing 15 and the output gear 15. To do. Thereby, without connecting external piping to the sub gear case 4, the bearings 14 and 17 in them, the meshing part of the output gear 15 and the input gear 20, etc. are lubricated.

Since the second oil passage 33 is opened in the sub gear case 4 through a gap 34 between the opposed surfaces of the outer bearing 15 and the output gear 15 at a position close to the inner surface of the end plate 3. The outer bearings 14 and 17 that are difficult to lubricate are also effectively lubricated.
Further, since the output shaft 13 is always rotating when the vehicle is traveling, the lubricating oil discharged from the second oil passage 33 is diffused in a wide range around the output shaft 13 like a rotary sprinkler. . Therefore, the lubricating oil is sufficiently distributed to each member in the auxiliary gear case 4 and is effectively lubricated. The lubricating oil supplied into the sub gear case 4 is integrally formed at the lower end of the main gear case 2 and the housing 1a of the torque converter unit 1 via a return oil passage (not shown) provided in the lower part of the partition wall 2a. The oil pan 36 flows down and is stored and recirculated.

As shown in FIG. 1, a filter housing chamber 37 is formed in the lower portion of the housing 1 a of the torque converter unit 1 so as to face the vertical direction with the lower end opened. The filter housing chamber 37 has a cylindrical oil filter 38. Is stored vertically from below. The lower open end of the filter housing chamber 37 is closed by a closing plate 39 that is detachably screwed.
Above the oil filter 38, the housing 1 a has a first suction oil passage 40 facing in the vertical direction and a second suction oil passage 41 facing in the front-rear direction communicating with the upper end thereof inside the oil filter 38. It is formed so as to communicate with the flow path. The second intake oil passage 41 is also connected to an external hydraulic circuit via an oil pump (not shown) provided outside the main gear case 2.

  At the left end of the main gear case 2 and the oil pan 36, a vertically extending partition plate 42 that divides the lower half of the main gear case 2 and the internal space in the oil pan 36 left and right is provided at the left end of the counter shaft 21. It is accommodated so as to be close to the right side surface of the fixed output gear 25 for retraction, and to be inserted into the intermediate shaft 16 and the counter shaft 21 or straddle from below, and the partition plate 42 has a plurality of outer peripheral portions. Is fixed to the left opening end of the main gear case 2 with a screw 43.

  A left and right oil absorbing hole 44 communicating with the oil pan 36 is provided at the lower end portion of the inner partition wall 1b of the filter housing chamber 37 in the housing 1a of the torque converter unit 1, and the oil absorbing hole 44 has a left and right direction. The left end portion of the oil absorption pipe 45 facing is press-fitted. The right end portion of the oil absorption pipe 45 extends through the partition plate 42 to the vicinity of the center portion of the oil pan 36 and is always immersed in the lubricating oil O stored in the oil pan 36. The inner suction port 45a of the oil suction pipe 45 is separated from the reverse gear 25 by the partition plate.

  When the oil pump is operated, the lubricating oil O in the oil pan 36 is sucked through the oil suction pipe 45 and flows into the oil filter 38 of the filter housing chamber 37, and the lubricating oil filtered by the oil filter 38 is first suctioned. The oil is sent to an external hydraulic circuit through the oil passage 40 and the second suction oil passage 41, and is sent to the first and second speed clutches 7 and 8, the reverse clutch 23, the auxiliary gear case 4, and the like described above. .

  When a vehicle equipped with a transmission tilts on a slope or the like, the oil level of the lubricating oil O in the oil pan 36 rises and is agitated by the reverse clutch gear 24 and the reverse output gear 25, and bubbles are mixed into the lubricating oil O. There are things to do. In this case, in particular, the lubricating oil O mixed with bubbles and agitated by the reverse output gear 25 disposed near the oil filter 38 and the oil suction hole 44 is sucked into the oil pump, and the suction efficiency thereof is increased. And durability may be reduced.

  However, as in the above-described embodiment, the partition plate 42 is provided on the inner side close to the right side surface of the reverse output gear 25, and the oil absorption pipe 45 is connected to the oil absorption hole 44 in the left-right direction. If the suction port 45 a for the lubricating oil O and the reverse output gear 25 are separated by the partition plate 42, even if the lubricating oil O is agitated by the reverse output gear 25, the lubricating oil O in which bubbles are mixed is absorbed by the oil absorption pipe 45. The risk of inhalation is very small. Therefore, the suction efficiency and durability of the oil pump are not reduced. Since the reverse clutch gear 24 is separated from the suction port 45a of the oil suction pipe 45, even if the lubricating oil O is agitated by the reverse clutch gear 24 and bubbles are mixed, the lubricating oil mixed with bubbles is sucked. The fear of being done is small.

  Further, since the filter accommodating chamber 37 is formed so as to face in the vertical direction, and the oil filter 38 is accommodated in the vertical direction in the filter accommodating chamber 37, the axial dimension of the housing 1a of the main gear case 2 or the torque converter unit 1 is reduced. This can reduce the overall size of the transmission.

  FIG. 4 is an enlarged cross-sectional view of the main part showing a modification of the transmission of the present invention. In this embodiment, the filter housing chamber 37 is placed below the housing 1a of the torque converter unit 1 with the input shaft 5 and intermediate shaft. The oil filter 38 is accommodated substantially horizontally in the filter housing chamber 37 so as to face in the front-rear direction. Even in this case, the axial dimensions of the main gear case 2 and the housing 1a of the torque converter unit 1 can be reduced as in the above embodiment, and the entire transmission can be downsized.

  In the above embodiment, the oil absorption pipe 45 is a straight pipe that faces in the left-right direction. However, as shown by a two-dot chain line in FIG. 4, the right end of the oil absorption pipe 45 is bent downward so that the suction port 45a You may make it oppose in the position near the bottom part of the oil pan 36. FIG. In this way, the risk of inhaling the lubricating oil O mixed with bubbles is further reduced.

DESCRIPTION OF SYMBOLS 1 Torque converter unit 1a housing 1b Partition 2 Main gear case 2a Partition 3 End plate 4 Sub gear case 5 Input shaft 6 Bearing 7 First speed clutch 8 Second speed clutch 9 First speed clutch gear 10 Bearing 11 Second speed Clutch gear 12 Reverse input gear 13 Output shaft 14 Bearing 15 Output gear 16 Intermediate shaft 17 Bearing 18 First intermediate gear 19 Second intermediate gear 20 Input gear 21 Counter shaft 22 Bearing 23 Reverse clutch 24 Reverse clutch gear 25 Reverse Output gear 26 Oil passage 27 Oil chamber 28 Hydraulic circuit 29 Oil chamber 30 Oil passage 31 Oil passage 32 First oil passage 33 Second oil passage 34 Gap 35 Oil guide hole 36 Oil pan 37 Filter housing chamber 38 Oil filter 39 Closing plate 40 First suction oil passage 41 Second suction oil passage 42 Partition plate 43 Screw 44 Oil absorption hole 45 Oil absorption pipe 45a suction port

Claims (5)

The rotation of the input shaft housed in a gear case having an oil pan at the lower portion and driven by being linked to an engine or the like is transmitted to the output shaft via a plurality of power transmission means including gears, etc., and In the transmission configured to suck the lubricating oil in the oil pan with an oil pump through an oil filter, and to recirculate the sucked lubricating oil after lubricating each member in the gear case.
A filter housing chamber is provided in a side wall of the gear case at a side of the oil pan so as to communicate with the oil pan through an oil absorption pipe, the oil filter is housed in the filter housing chamber, and the oil pan Characterized in that a partition plate is provided in an inner space below the gear case for separating the gear in the power transmission means disposed directly above the oil pan and the lubricating oil suction port of the oil suction pipe. .   The transmission according to claim 1, wherein the oil absorption pipe extends through the partition plate to an intermediate portion of the oil pan.   The transmission according to claim 1 or 2, wherein the filter storage chamber is provided so as to face in the vertical direction, and the oil filter is stored in the filter storage chamber in a vertical direction.   The transmission according to claim 1 or 2, wherein the filter housing chamber is provided so as to face a direction orthogonal to the input shaft, and the oil filter is housed substantially horizontally in the filter housing chamber.   The transmission according to any one of claims 1 to 4, wherein the suction hole of the oil suction pipe faces downward so as to face the bottom of the oil pan.

Images