CN110832229A

CN110832229A - Lubricating oil purification device of transmission

Info

Publication number: CN110832229A
Application number: CN201880042961.5A
Authority: CN
Inventors: 寺岛幸士
Original assignee: Isuzu Motors Ltd
Current assignee: Isuzu Motors Ltd
Priority date: 2017-06-26
Filing date: 2018-06-18
Publication date: 2020-02-21
Anticipated expiration: 2038-06-18
Also published as: JP6916417B2; JP2019007565A; WO2019003976A1; CN110832229B

Abstract

A lubricating oil purifying device for a transmission in which lubricating oil is stored in a casing, wherein a filter for purifying the lubricating oil is disposed on a casing wall surface facing a rotating body disposed in the casing in a radial direction.

Description

Lubricating oil purification device of transmission

Technical Field

The present disclosure relates to a lubricating oil purification apparatus for a transmission that purifies lubricating oil stored inside the transmission.

Background

Conventionally, in a transmission in which a plurality of shafts and gears are disposed inside a case to transmit power, there is known a transmission in which lubricating oil is stored inside the case and supplied to the shafts and gears by, for example, stirring up the rotating gears.

Further, as for such a transmission, there is known one in which a lubricant purifying device that suppresses a failure due to deterioration of lubricant while extending the life of the lubricant is disposed inside a case (for example, see patent document 1).

In the lubricating oil purification apparatus disclosed in patent document 1, a filter for trapping and purifying (filtering) a part of the stirred lubricating oil is disposed inside the casing, and the filter is disposed on a stirring path of the lubricating oil that is not injected into the shaft or the gear among the oil stirred up by the gear.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2005-003026

Disclosure of Invention

Problems to be solved by the invention

However, in the transmission lubricating oil purification device disclosed in the prior art document, it is necessary to dispose a filter in the casing on a path where lubricating oil is stirred up, the lubricating oil not being injected into the shaft or the gear. Therefore, it is necessary to secure an arrangement space for arranging the filter in the narrow case, and it is difficult to efficiently collect the lubricating oil and the like stirred up by the plurality of gears.

In order to solve the above-described problems, an object of the present disclosure is to provide a transmission lubricating oil purifying apparatus capable of efficiently collecting lubricating oil stirred up by a plurality of gears while efficiently disposing a filter inside a narrow case.

Means for solving the problems

In order to achieve the above object, the technique of the present disclosure is directed to a lubricating oil purification device for a transmission in which lubricating oil is stored in a casing, wherein a filter for purifying the lubricating oil is disposed on a casing wall surface facing a rotating body disposed in the casing in a radial direction.

Further, it is preferable that, with respect to the filter, a lower portion thereof is immersed in the lubricating oil.

Preferably, an upper edge of the filter disposed on the opposite side of the upper end of the rotating body with respect to the rotation direction is located above the upper end of the rotating body.

Preferably, the rotating body includes a lower gear disposed at a lower stage, and an upper gear disposed at an upper stage, the filter includes a 1 st filter and a 2 nd filter, the 1 st filter is disposed on a side opposite to a rotation direction of an upper end of the lower gear, the 2 nd filter is disposed to face the 1 st filter, an upper edge of the 2 nd filter is located above the upper end of the lower gear, and an upper edge of the 1 st filter is located above the upper edge of the 2 nd filter and the upper end of the upper gear.

Effects of the invention

According to the technique of the present disclosure, the filter can be provided in the rotating body, and the filter can be efficiently disposed in the narrow casing, and the lubricating oil stirred up by the plurality of gears can be efficiently collected.

Brief description of the drawings

Fig. 1 is a sectional view of an example of a transmission to which a lubricating oil purifying device for a transmission according to the present embodiment is applied.

Fig. 2 is a schematic cross-sectional view of the transmission along the line a-a in fig. 1 to which the lubricating oil purifying apparatus of the transmission according to the present embodiment is applied.

Detailed Description

Hereinafter, a lubricating oil purification device for a transmission according to an embodiment of the present disclosure will be described with reference to the drawings. The same components are denoted by the same reference numerals, and the names and functions thereof are also the same. Therefore, detailed description thereof will not be repeated. For convenience of explanation, in fig. 1, the left side is referred to as an input side (one end side) in the power transmission direction, and the right side is referred to as an output side (the other end side) in the power transmission direction. In the following description, the vertical directions are the same as the vertical directions of the vehicle body when the vehicle body is mounted.

In the following description, the front, rear, left, right, up and down directions are the same as the front, rear, left, right, up and down directions observed by the driver when the vehicle travels forward. Therefore, the left-right direction is synonymous with the vehicle width direction. However, the front, rear, left, right, and up-down directions are not limited to the front, rear, left, right, and up-down directions in a strict sense. For example, the front, rear, left, and right directions are not limited to the horizontal plane, and the up-down directions are not limited to the vertical direction, and include the cases where each direction is expressed in terms of functionality.

The transmission 1 shown in fig. 1 includes an input shaft 2, a main shaft 3, an output shaft 4, a counter shaft 5, a clutch case 6, and a transmission case 7.

The input shaft 2 is a shaft member to which a rotational driving force generated by an engine, not shown, is transmitted via a crankshaft. A primary driven gear 8 is attached to an output-side end portion of the input shaft 2, and the primary driven gear 8 also has a bearing that rotatably supports an input-side end portion of the main shaft 3. The input shaft 2 may be configured to support the primary driven gear 8 in a relatively non-rotatable manner by spline coupling, and to support the main shaft 3 in a relatively rotatable manner by a bearing.

The main shaft 3 is arranged coaxially with the input shaft 2, and a driven gear set 11 including a plurality of speed change gears 9 and a sleeve 10 is mounted in addition to the primary driven gear 8.

The output shaft 4 is disposed coaxially with the main shaft 3 at an output-side end of the main shaft 3. An output-side end portion of the output shaft 4 is connected to an automobile propeller shaft, not shown.

The counter shaft 5 is arranged in parallel with the input shaft 2 and the main shaft 3. A drive gear group 14 including a primary drive gear 12 meshing with the primary driven gear 8 and a plurality of speed change gears 13 is mounted on the counter shaft 5. The speed gears 13 of the drive gear set 14 mesh with the speed gear 9 of the driven gear set 11.

The clutch case 6 and the transmission case 7 are members as housings in the transmission 1. The clutch case 6 is disposed on the input side, and the transmission case 7 is disposed on the output side. The clutch case 6 and the transmission case 7 are joined to each other so that the flange portion 6a of the output side end portion and the flange portion 7a of the input side end portion are aligned, and thereby the housing space 15 is formed in a liquid-tight state.

Various members constituting the driven gear group 11 and the drive gear group 14 are accommodated in the accommodation space 15. The storage space 15 stores the lubricating oil OL having the vicinity of the axis of the counter shaft 5 as a liquid surface. As a result, the counter shaft 5, the primary drive gear 12, and substantially the lower half portions of the plurality of speed change gears 13 are immersed in the lubricating oil OL.

As shown in fig. 2, when the primary drive gear 12 and the transmission gear 13 rotate, the lubricant OL is scraped by the rotation, and a part of the scraped lubricant OL is supplied to the driven gear group 11 including the primary driven gear 8 and the transmission gear 9.

As shown in fig. 1, the clutch case 6 integrally includes a partition wall 6b on the input side of the flange portion 6a, the partition wall 6b rotatably supporting the vicinity of the output end portion of the input shaft 2 and the input side end portion of the counter shaft 5 and dividing the input side of the housing space 15. Supported on the partition wall 6b are: a bearing 16 that rotatably supports the output end side of the input shaft 2; and a bearing 17 that rotatably supports an input-side end portion of the counter shaft 5.

Specifically, an opening 6c for supporting the bearing 17 is formed in the partition wall 6 b. The opening 6c is covered with a cover 18 from the outside (input side) of the partition wall 6b to ensure a liquid-tight state of the housing space 15. The cover 18 may be integrated with the partition wall 6 b.

The transmission case 7 integrally has a partition wall 7b on the output side of the flange portion 7a, and the partition wall 7b rotatably supports the vicinity of the input side end portion of the output shaft 4 and the output side end portion of the counter shaft 5 and partitions the output side of the housing space 15. In the partition wall 7b, a bearing 19 is provided that rotatably supports the output end of the secondary shaft 5. The output-side end of the main shaft 3 (or the input-side end of the output shaft 4) is also rotatably supported by the partition wall 7b via a bearing (not shown).

In this way, the partition wall 6b and the partition wall 7b form the housing space 15 as the interior of the case in which the plurality of power transmission members including the

shafts

2, 3, 4, 5 and the

gears

8, 9, 12, 13 that realize the power transmission function as the transmission 1 are housed.

The components of the driven gear set 11, such as the input shaft 2, the main shaft 3, the output shaft 4, the primary driven gear 8, the speed change gear 9, and the sleeve 10, can be of known configurations. Therefore, further detailed description thereof is omitted.

The counter shaft 5, the primary drive gear 12, and the change gear 13 that constitute the drive gear group 14 are components having a power transmission function, and a configuration known in the art can be used.

The primary driven gear 8 and the speed change gear 9, and the primary drive gear 12 and the speed change gear 13 have substantially the same function of transmitting power to the

shafts

2, 3, 4, and 5, and have gear characteristics such as diameter (gear ratio) and thickness that are appropriately different. Therefore, in the following description, the relationship between the speed change gear 9 and the speed change gear 13 will be mainly described, and only corresponding reference numerals are given in parentheses in the relationship between the primary driven gear 8 and the primary drive gear 12, and detailed description thereof will be omitted.

As shown in fig. 2, a through hole 13b (12b) through which the counter shaft 5 passes is formed in the transmission gear 13 (and the primary drive gear 12), for example, at the center of a substantially disk-shaped gear body 13a (12 a). Further, gear teeth 13c (12c) are formed on the outer peripheral surface of the gear body 13a (12 a).

The gear teeth 13c (12c) mesh with gear teeth 9a (8a) formed on the outer peripheral surface of the speed change gear 9 (and the primary driven gear 8). Further, the gear teeth 9a (8a) and the gear teeth 13c (12c) may be engaged with each other by either a spur gear or a helical gear.

As shown in fig. 2, filters 20 and 21 for purifying lubricant OL are disposed on both casing wall surfaces facing in the radial direction with respect to transmission gears 9(8) and 13(12) as rotating bodies disposed in the housing space 15, respectively.

The lower portions of the

filters

20 and 21 are immersed in the lubricating oil OL, and the upper edge of the filter 20 on the side opposite to the rotation direction, for example, of the upper ends of the transmission gears 9(8) disposed on the upper side is located above the upper ends of the transmission gears 9 (8). Similarly, the upper edge of the filter 21 on the side opposite to the rotation direction among the upper edges of the speed change gears 13 and 12 disposed on the lower side is positioned above the upper edges of the speed change gears 13 and 12. As shown in fig. 2, the upper edge of the filter 20 may be located above the upper edge of the filter 21.

The filter 20 may be, for example, a foam such as a sponge, a filter assembly in which a felt filter is assembled, a filter assembly covered with a non-reactive material such as Polytetrafluoroethylene (PTFE), or the like, and the like, which is directly provided on the wall surface of the casing with an adhesive or the like, and which has water-absorbing properties and can trap and filter impurities contained in the lubricating oil OL. In addition, when the foam is used for the filter 20, the foam may be a synthetic foam containing activated carbon or the like having a high impurity trapping (adsorbing) effect.

In this way, in the lubricating oil purification device of the transmission 1 according to the present embodiment, the

filters

20 and 21 are directly disposed on the casing wall surface facing the transmission gears 9(8) and 13(12) as the rotating bodies in the radial direction, so that the filter 20 can be efficiently disposed in the narrow accommodation space 15, and the lubricating oil stirred up by the plurality of gears can be efficiently collected. Specifically, in a lubricating oil purification device for a transmission 1 in which a lubricating oil OL is stored in a storage space 15, filters 20 and 21 for purifying the lubricating oil OL are disposed on casing wall surfaces facing in the radial direction to a transmission gear 9(8) and a transmission gear 13(12) disposed in the storage space 15.

Next, the operation of the lubricating oil purification device of the transmission 1 will be described. In the above configuration, the input shaft 2 is rotated by a rotational force transmitted from an engine, not shown. The rotational force from the input shaft 2 is transmitted to the counter shaft 5 by the meshing of the gear teeth 8a of the primary driven gear 8 with the gear teeth 12c of the primary drive gear 12.

When the counter shaft 5 rotates, the gear teeth 9a of the change gear 9 and the gear teeth 13c of the change gear 13 corresponding to the change gear 9 rotate with each other in mesh with each other. The sleeve 10 is displaced on the shaft of the main shaft 3 in accordance with the number of gear stages, and the corresponding change gear 9 is connected to the main shaft 3, and the rotational force of the sub shaft 5 is transmitted to the output shaft 4 via the main shaft 3.

Here, the transmission gears 13 and 12 are left and right in the lower half portions thereof immersed in the lubricant OL stored in the storage space 15. Therefore, the speed change gear 13(12) scrapes the lubricating oil OL directly along with the rotation thereof, and mainly supplies the scraped lubricating oil OL1 to the speed change gear 9(8) which meshes with each other. The lubricating oil OL1 includes lubricating oil adhering to the gear teeth 13c (12c) and adhering to the gear teeth 9a (8a) of the speed change gear 9(8) due to surface tension.

On the other hand, with regard to the speed change gears 9(8) and 13(12), for example, there are cases where: a part of the lubricant OL2 in the lubricant OL1 scraped off by the speed change gear 13(12) directly flies toward the radially opposed casing wall surface without reaching the speed change gear 9 (8). Further, on the downstream side in the rotational direction in which the ratio gear 9(8) meshes with the ratio gear 13(12), there are cases where: the lubricant OL3 mainly stirred by the speed change gears 9(8) directly flies toward the radially opposite casing wall surface. Further, the upper end side of the speed change gears 9(8) may be as follows: the lubricant OL4 stirred by the speed change gear 9(8) directly flies toward the radially opposite casing wall surface.

However, in the lubricating oils OL2 to OL4, the

filters

20 and 21 are disposed on the casing wall surfaces facing each other in the opposite direction to the rotation direction, and the upper edges of the

filters

20 and 21 disposed on the opposite side to the rotation direction among the upper ends of the speed change gears 9(8) and 13(12) are located above the upper ends of the speed change gears 9(8) and 13 (12). That is, the filter 20 is disposed at the upper end of the transmission gear 9(8) at the upper stage in the direction opposite to the rotation direction, and the upper edge thereof is located above the upper end of the transmission gear 9 (8). Similarly, a filter 21 is disposed at the upper end of the transmission gear 13(12) located at the lower stage in the direction opposite to the rotation direction, and the upper edge thereof is located above the upper end of the transmission gear 13 (12).

Thus, the

filters

20 and 21 can efficiently collect the lubricating oils OL2 to OL4 stirred (churned) up by the transmission gears 9(8) and 13 (12).

Further, since the lower ends of the

filters

20 and 21 are immersed in the lubricating oil OL, the collected lubricating oils OL2 to OL4 can be directly purified (filtered) and reduced to the lubricating oil OL stored in the storage space 15. In addition, the

filters

20 and 21 immersed in the lubricant OL stored in the storage space 15 are capable of generating convection due to the stirring action accompanying the rotation of the transmission gears 13 and 12, and purifying (filtering) the lubricant OL by the convection.

The transmission oil purification apparatus according to the present disclosure is not limited to the above-described embodiments, and various modifications of design are included within the scope of the invention described in the claims.

For example, the height of the filter 21 may be the same as that of the filter 20. The material and the like of the filter 20 and the filter 21 may be different.

The present application is based on japanese patent application published on 26/6/2017 (japanese patent application 2017-124456), the contents of which are incorporated herein by reference.

Industrial applicability

The present invention has an effect that a filter can be provided in a rotating body, and the filter can be efficiently disposed in the narrow casing, and that the lubricating oil stirred up by a plurality of gears can be efficiently collected, and is useful for a lubricating oil purification device for a transmission, and the like.

Description of the reference numerals

1 … speed variator

2 … input shaft

3 … Main shaft

4 … output shaft

5 … auxiliary shaft

6 … Clutch case (casing)

7 … speed variator box (casing)

8 … Primary driven gear (rotator)

9 … speed-changing gear (rotator)

12 … Primary Driving Gear (rotating body)

13 … speed-changing gear (rotator)

15 … storage space (inside of the casing)

20 … filter

21 … filter

OL … lubricating oil

Claims

1. A lubricating oil purifying device for a transmission, which stores lubricating oil in a casing,

a filter for purifying the lubricating oil is disposed on a casing wall surface facing a rotating body disposed inside the casing in a radial direction.

2. The lubricating oil purifying apparatus for a transmission according to claim 1,

the filter is immersed in the lubricating oil at a lower portion thereof.

3. The lubricating oil purifying apparatus for a transmission according to claim 1 or 2,

an upper edge of the filter disposed on a side opposite to the rotation direction of the upper end of the rotating body is located above the upper end of the rotating body.

4. The lubricating oil purifying apparatus for a transmission according to any one of claims 1 to 3,

the rotating body includes:

a lower gear disposed at a lower stage, an

An upper gear disposed at an upper stage;

the above-mentioned filter includes:

a 1 st filter disposed on one side of an upper end of the lower stage gear which is opposite to the rotation direction, and

a 2 nd filter disposed to face the 1 st filter;

the upper edge of the 2 nd filter is positioned above the upper end of the lower gear;

the upper edge of the 1 st strainer is located above the upper edge of the 2 nd strainer and the upper end of the upper gear.