CN110799778A

CN110799778A - Lubricating oil purification device of transmission

Info

Publication number: CN110799778A
Application number: CN201880042962.XA
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: 2020-02-14
Anticipated expiration: 2038-06-18
Also published as: CN110799778B; JP2019007564A; JP6876918B2; WO2019003974A1

Abstract

A lubricating oil purification device for a transmission, which stores lubricating oil in a case, and which has: a lubricating oil introduction portion provided on an upstream side defined by a centrifugal force accompanying rotation of the rotating body; a lubricant oil discharge portion provided on a downstream side defined by a centrifugal force accompanying rotation of the rotating body; and a filter provided in a lubricant oil purification path from the introduction portion to the discharge portion to purify the lubricant oil.

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, in such a transmission, a lubricating oil purifying device that extends the life of lubricating oil and suppresses a failure due to deterioration of the lubricating oil is disposed inside a case (see, for example, patent documents 1 to 3).

Documents of the prior art

Patent document

Patent document 1: japanese patent application laid-open publication No. 2011-112207

Patent document 2: japanese laid-open patent publication No. 63-130964

Patent document 3: japanese Kokai publication Hei 06-012832

Disclosure of Invention

Problems to be solved by the invention

In the lubricating oil purification devices disclosed in patent documents 1 to 3, a collecting casing for collecting a part of the lubricating oil which has been stirred or lifted up outside or inside the casing needs to be provided, and the following problems occur: the structure is complicated by merely disposing the collecting casing integrally with or separately from the casing. Further, in a transmission in which a plurality of gears having different diameters are arranged, the positions at which the lubricating oil is stirred up or bounced up are different for each gear, and therefore, in order to efficiently trap the lubricating oil, the following problems occur: the construction of the trap housing can be further complicated.

In order to solve the above-described problems, an object of the present disclosure is to provide a lubricating oil purification device for a transmission, in which a filter can be efficiently disposed inside a narrow case.

Means for solving the problems

In order to achieve the above object, the disclosed technology is directed to a lubricating oil purification device for a transmission in which lubricating oil is stored in a casing, wherein a filter is disposed at an upper position in a direction opposite to a rotation direction of a lower stage gear disposed at a lower stage in a gear pair disposed in the casing and vertically meshed with each other, so as to collect a part of the lubricating oil stirred up by the lower stage gear.

Preferably, the filter has a tip that enters inside a horizontally outermost periphery of the lower stage gear.

Preferably, the gear pair further includes a bracket extending from an inner peripheral surface of the housing to the gear pair, and the filter is provided on a surface of the bracket facing the lower stage gear.

Preferably, the gear transmission device includes a 1 st bracket and a 2 nd bracket, the 1 st bracket extending from a 1 st inner peripheral surface of the housing to the gear pair, the 2 nd bracket extending from a 2 nd inner peripheral surface of the housing to the gear pair, the 2 nd inner peripheral surface facing the 1 st inner peripheral surface, the filter including a 1 st filter and a 2 nd filter, the 1 st filter being provided on a surface of the 1 st bracket facing the lower gear, and the 2 nd filter being provided on a surface of the 2 nd bracket facing the upper gear disposed on the upper stage of the gear pair.

Further, the present invention provides a lubricating oil purification device for a transmission in which lubricating oil is stored in a casing, wherein a filter is disposed so as to face a lower position in a direction not opposite to a rotation direction of a higher-stage gear disposed in a gear pair vertically meshing with the gear pair disposed in the casing, and a part of the lubricating oil dropping from the higher-stage gear is collected.

Preferably, the filter has a tip that enters inside a horizontally outermost periphery of the upper gear.

Preferably, the gear transmission further includes a 1 st bracket extending from the 1 st inner peripheral surface of the housing to the gear pair, the 1 st bracket has an opening formed therethrough, and the filter is provided on a surface of the 1 st bracket facing the upper gear so as to cover the opening.

Preferably, the filter includes a 1 st filter and a 2 nd filter, and further includes a 2 nd bracket extending from a 2 nd inner peripheral surface of the housing to the gear pair, the 2 nd inner peripheral surface facing the 1 st inner peripheral surface, and the 2 nd filter being provided in the 2 nd bracket on a surface facing the lower gear of the gear pair disposed at the lower stage.

Effects of the invention

According to the technique of the present disclosure, the filter can be efficiently disposed inside the narrow casing.

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 viewed by the driver when the vehicle is traveling 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. On the counter shaft 5, a drive gear set 14 is mounted, and this drive gear set 14 includes a primary drive gear 12 meshing with the primary driven gear 8, and a plurality of change gears 13. 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 that form a housing 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.

The housing space 15 houses various components constituting the driven gear set 11 and the drive gear set 14. The housing space 15 stores the lubricant OL having the vicinity of the axis of the counter shaft 5 as a liquid surface. Thereby, substantially the lower half portions of the counter shaft 5, the primary drive gear 12, and the plurality of change gears 13 are in a state to be soaked in the lubricating oil OL.

As shown in fig. 2, when the primary drive gear 12 and the speed change gear 13 rotate, the lubricant OL is scraped by the rotation, and a part of the scraped lubricant OL1 is supplied to the driven gear set 11 including the primary driven gear 8 and the speed change 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, the partition wall 6b is formed with an opening 6c for supporting the bearing 17. 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 end of the counter shaft 5 and partitions the output side of the housing space 15. The partition wall 7b is provided with a bearing 19 that rotatably supports the output-side end of the counter 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 that houses 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.

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 configured as members having a power transmission function, and a configuration of a known technique 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.

Filters

23 and 24 for purifying the lubricant OL are disposed on both casing wall surfaces facing the transmission gears 9(8) and 13(12) as rotating bodies disposed in the housing space 15 in the radial direction via

brackets

21 and 22, respectively.

As the

filters

23 and 24, those having water-absorbing property and capable of trapping and filtering impurities contained in the lubricating oil OL, for example, foams such as sponge, filter modules in which felt filters are assembled, filter modules covered with a non-reactive material such as Polytetrafluoroethylene (PTFE), and the like can be used. When the foam is used for the filter 23, the foam may be a synthetic foam containing activated carbon or the like having a high impurity trapping (adsorbing) effect.

The

brackets

21, 22 are bent in a substantially L-shaped cross section, one end side thereof is fixed to the clutch case 6 or the transmission case 7, and the other end side thereof supports the

filters

23, 24.

Specifically, the filter 23 is provided directly on the bottom surface of the bracket 21 with an adhesive or the like on the upper surface thereof. The filter 24 is directly provided on the upper surface of the bracket 22 with an adhesive or the like on the bottom surface thereof. Therefore, the opening 22a for recovering the collected and purified (filtered) lubricating oil to the lubricating oil OL stored in the storage space 15 is formed in the bracket 23. The

brackets

21 and 22 and the

filters

23 and 24 are provided at different positions for each gear pair that is disposed in the housing space 15 and vertically meshed with each other, so as to correspond to conditions such as a gear diameter. In this case, it is preferable that the width of the

brackets

21 and 22 and the

filters

23 and 24 is equal to or larger than the gear thickness, and it is preferable that the width of the adjacent gear pair, the

brackets

21 and 22, and the

filters

23 and 24 is set so as not to interfere with each other.

The strainer 23 is disposed to face the transmission gear 13(12) (an example of the lower stage gear) at an upper position in the opposite direction to the rotation direction thereof, and traps the lubricant OL2 which is a part of the lubricant OL1 stirred up by the transmission gear 13(12) of the lower stage, and the transmission gear 13(12) is disposed at the lower stage among the transmission gears 9(8) and 13(12) which are gear pairs disposed in the housing space 15 and vertically meshed with each other. That is, the filter 23 is disposed on the surface of the carrier 21 facing the transmission gear 13(12) disposed on the lower stage. Here, the tip of the filter 23 enters the inside of the horizontally outermost periphery of the transmission gear 13(12) disposed at the lower stage. However, the front end position is determined so as not to trap the lubricant OL1 stirred up by the transmission gears 13 (12). Therefore, the tip position can be appropriately set according to the diameter, thickness, rotation speed, and the like of the gear. The filter 23 is disposed obliquely so that the front end side faces upward.

The filter 24 is disposed at a lower position opposite to the rotation direction of the transmission gear 9(8) (an example of the upper stage gear) so as to collect a part of the lubricant OL3 dropped from the transmission gear 9(8) of the upper stage, and the transmission gear 9(8) is disposed at the upper stage among the transmission gears 9(8) and 13(12) as gear pairs disposed in the housing space 15 and meshing vertically. That is, the filter 24 is disposed on a surface of the carrier 22 facing the transmission gear 9(8) disposed on the upper stage. Here, the tip of the filter 24 enters the inside of the horizontally outermost periphery of the transmission gear 9(8) disposed at the upper stage. The filter 24 may be disposed so as to cover the opening 22a of the bracket 22.

The carrier 21 may be provided to extend from the 1 st inner peripheral surface of the clutch case 6 and/or the transmission case 7, which are examples of the case, to the transmission gears 9(8) and 13(12), which are gear pairs. The carrier 22 may be provided to extend from the 2 nd inner peripheral surface facing the 1 st inner peripheral surface of the clutch case 6 and/or the transmission case 7, which are examples of the case, to the transmission gears 9(8) and 13(12), which are gear pairs.

As described above, the lubricating oil purification device of the transmission 1 according to the present embodiment can be arranged individually according to the size or thickness of each gear pair, and therefore, the lubricating oils OL2 and OL3 can be efficiently replenished to the transmission 1 in which a plurality of gear pairs having different diameters are arranged.

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 speed change gear 9 and the gear teeth 13c of the speed change gear 13 corresponding to the speed change gear 9 rotate 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 gear 13(12) is immersed in the lubricant OL stored in the storage space 15 at substantially the lower half thereof. 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 dropped from the upper stage transmission gear 13(12) is directly dropped to the lubricant OL.

However, since the lubricating oils OL2 and OL3 are disposed with the

filters

23 and 24 facing each other in the direction opposite to the rotation direction, respectively, the lubricating oils OL2 and OL3 stirred up or dropped by the speed change gears 9(8) and 13(12) can be efficiently collected.

The lubricating oils OL2 and OL3 collected by the

filters

23 and 24 can be directly purified (filtered) and reduced to the lubricating oil OL stored in the storage space 15.

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 material of the filter 23 may be different from that of the filter 24.

The present application is based on japanese patent application published on 26/6/2017 (japanese patent application 2017-124455) and the content thereof is incorporated herein by reference.

Industrial applicability

The present invention has an effect that a filter can be efficiently disposed inside a narrow case, 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 case (casing)

8 … Primary driven Gear

9 … speed change gear

12 … Primary drive Gear

13 … speed change gear

15 … storage space (inside of the casing)

23 … Filter

24 … filter

OL … lubricating oil

Claims

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

a filter is disposed at an upper position in a direction opposite to a rotation direction of a lower gear disposed at a lower stage among a gear pair disposed in the housing and vertically engaged with the lower gear, so as to collect a part of the lubricating oil stirred up by the lower gear.

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

the filter has a tip that enters inside a horizontally outermost periphery of the lower gear.

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

further comprising a bracket extending from an inner peripheral surface of the housing to the gear pair;

the filter is provided on a surface of the bracket facing the lower gear.

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

a 1 st bracket extending from a 1 st inner peripheral surface of the housing toward the gear pair, an

A 2 nd bracket extending from a 2 nd inner peripheral surface of the housing toward the gear pair;

the 2 nd inner peripheral surface faces the 1 st inner peripheral surface;

the filter is composed of a 1 st filter and a 2 nd filter;

a 1 st filter provided on a surface of the 1 st bracket facing the lower gear;

in the 2 nd carrier, the 2 nd filter is provided on a surface facing a higher-stage gear disposed on a higher stage of the gear pair.

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

a filter is disposed to face a lower position in a direction not opposite to a rotation direction of the upper stage gear disposed on the upper stage, among the gear pair vertically meshing with the gear pair disposed inside the housing, so as to collect a part of the lubricating oil dropping from the upper stage gear.

6. The lubricating oil purifying apparatus for a transmission according to claim 5,

the filter has a tip that enters inside a horizontally outermost periphery of the upper gear.

7. The lubricating oil purifying apparatus for a transmission according to claim 5 or 6,

further comprising a 1 st bracket extending from a 1 st inner peripheral surface of the housing to the gear pair, and an opening penetrating the 1 st bracket is formed in the 1 st bracket;

the filter is provided on a surface of the 1 st bracket facing the upper gear so as to cover the opening.

8. The lubricating oil purifying apparatus for a transmission according to claim 7,

the filter is composed of a 1 st filter and a 2 nd filter;

further comprising a 2 nd bracket extending from a 2 nd inner peripheral surface of the housing to the gear pair, the 2 nd inner peripheral surface being opposed to the 1 st inner peripheral surface;

the 2 nd filter is provided on a surface of the 2 nd bracket facing the lower gear of the gear pair disposed at the lower stage.