JP6916417B2 - Lubricating oil purification device for transmission - Google Patents

Description

The present invention relates to a transmission lubricating oil purifying device that purifies the lubricating oil stored inside the transmission.

Conventionally, in a transmission in which a plurality of shafts and gears are arranged inside a case to transmit power, lubricating oil is stored inside the case, and for example, each shaft or gear is lubricated by flipping up a rotating gear. It is known to supply oil.

Further, it is known that such a transmission is provided with a lubricating oil purifying device inside a case, which extends the life of the lubricating oil and suppresses a defect caused by deterioration of the lubricating oil (for example,). See Patent Document 1).

In the lubricating oil purifying device disclosed in Patent Document 1, a filter that collects and purifies (filters) a part of the splashed lubricating oil is arranged inside the case, and among the oils splashed by the gear. The filter is placed on the trajectory of the lubricating oil that is not poured onto the shaft or gear.

Japanese Unexamined Patent Publication No. 2005-003026

However, in such a lubricant purifying device for a transmission disclosed in the prior art document, it is necessary to arrange a filter inside the case on a jumping locus of the lubricating oil that is not poured into the shaft or gear. .. For this reason, it is necessary to secure an arrangement space for arranging the filter inside a narrow case, and it is difficult to efficiently collect the lubricating oil splashed by a plurality of gears. rice field.

In the technique of the present disclosure, in order to solve the above-mentioned problems, the filter can be efficiently arranged inside a narrow case, and the lubricating oil splashed by a plurality of gears can be efficiently collected. It is an object of the present invention to provide a lubricating oil purifying device for a transmission capable of capable of providing a lubricating oil purifying device.

The technique of the present disclosure is a lubricating oil purifying device for a transmission in which lubricating oil is stored inside a case in order to achieve the above object, and is a case facing a rotating body arranged inside the case in the radial direction. A filter that purifies the lubricating oil is placed on the wall surface.

Further, it is preferable that the lower portion of the filter is immersed in the lubricating oil.

Further, it is preferable that the upper edge of the filter arranged on the side facing the counter direction with respect to the rotation direction at the upper end of the rotating body is located above the upper end of the rotating body.

According to the technique of the present disclosure, a filter can be provided on the rotating body, the filter can be efficiently arranged inside a narrow case, and the lubricating oil splashed by a plurality of gears can be efficiently collected. Can be done.

It is sectional drawing of an example of the transmission to which the lubricating oil purification device of the transmission which concerns on this embodiment is applied. It is a schematic cross-sectional view of the transmission along the line AA of FIG. 1 to which the lubricating oil purification device of the transmission according to this embodiment is applied.

Hereinafter, the lubricating oil purifying device for the transmission according to the embodiment of the present invention will be described with reference to the accompanying drawings. The same parts are designated by the same reference numerals, and their names and functions are also the same. Therefore, detailed explanations about them will not be repeated. For convenience of explanation, in FIG. 1, the left side in the drawing is referred to as an input side (one end side) in the power transmission direction, and the right side in the drawing is referred to as an output side (the other end side) in the power transmission direction. Further, in the following description, each direction of the upper and lower parts is the same as the upper and lower parts of the vehicle body when the vehicle body is mounted.

Further, in the following description, each direction of front / rear / left / right / up / down will be described as being the same as front / rear / left / right / up / down as seen from the driver when the vehicle is traveling forward. Therefore, the left-right direction is synonymous with the vehicle width direction. However, the front-back, left-right, up-down directions do not always indicate the front-back, left-right, up-down directions in a strict sense. For example, the front-back and left-right directions are not always based on the horizontal plane, and the vertical directions are not always based on the vertical direction, and include cases where each direction is indicated in a functional sense.

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 housing 6, and a transmission case 7.

The input shaft 2 is a shaft member in which a rotational driving force generated by an engine (not shown) is transmitted via a crankshaft. A primary driven gear 8 that also serves as a bearing that rotatably supports the input side end of the main shaft 3 is mounted on the output side end of the input shaft 2. The input shaft 2 may pivotally support the primary driven gear 8 so as to be relatively non-rotatable by spline coupling, and may pivotally support the main shaft 3 so as to be relatively rotatable via a bearing.

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

The output shaft 4 is arranged coaxially with the main shaft 3 at the output side end of the main shaft 3. A propeller shaft (not shown) is connected to the output side end of the output shaft 4.

The counter shaft 5 is arranged in parallel with the input shaft 2 and the main shaft 3. The counter shaft 5 is equipped with a drive gear group 14 including a primary drive gear 12 that meshes with the primary driven gear 8 and a plurality of transmission gears 13. Each of the transmission gears 13 of the drive gear group 14 is meshed with the transmission gear 9 of the driven gear group 11.

The clutch housing 6 and the transmission case 7 are members that serve as a housing in the transmission 1. The clutch housing 6 is arranged on the input side, and the transmission case 7 is arranged on the output side. The clutch housing 6 and the transmission case 7 form a storage space 15 in a liquid-tight state by joining the flange portion 6a at the output side end portion and the flange portion 7a at the input side end portion so as to abut against each other.

Various parts constituting the driven gear group 11 and the drive gear group 14 are stored in the storage space 15. Lubricating oil OL whose liquid level is near the axis of the counter shaft 5 is stored in the storage space 15. As a result, the counter shaft 5, the primary drive gear 12, and the lower half of the plurality of transmission gears 13 are immersed in the lubricating oil OL.

As shown in FIG. 2, when the primary drive gear 12 and the speed change gear 13 rotate, the rotation causes the lubricating oil OL to be scraped up, and a part of the scraped up lubricating oil OL 1 is used as a driven gear including the primary driven gear 8 and the speed change gear 9. Lubricating oil OL can be supplied to the group 11.

As shown in FIG. 1, the clutch housing 6 rotatably supports the vicinity of the output end of the input shaft 2 and the input side end of the counter shaft 5 on the input side of the flange portion 6a to provide a storage space 15. A partition 6b for partitioning the input side is integrally provided. The partition wall 6b is supported by a bearing 16 that rotatably supports the output end side of the input shaft 2 and a bearing 17 that rotatably supports the input side end of the counter shaft 5.

Specifically, the partition wall 6b is formed with an opening 6c that supports the bearing 17. The opening 6c is covered with a cover 18 from the outside (input side) of the partition wall 6b so as to secure a liquidtight state of the storage space 15. The cover 18 may be integrated with the partition wall 6b.

The transmission case 7 rotatably supports the vicinity of the input side end of the output shaft 4 and the output side end of the counter shaft 5 on the output side of the flange portion 7a to partition the output side of the storage space 15. It has a partition wall 7b integrally. The partition wall 7b is provided with a bearing 19 that rotatably supports the output 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).

As described above, the partition 6b and the partition 7b are power transmission components including a plurality of shafts 2, 3, 4, 5 and gears 8, 9, 12, 13 that realize the power transmission function as the transmission 1. A storage space 15 is formed as the inside of the storage case.

As the components such as the input shaft 2, the main shaft 3, the output shaft 4, the primary driven gear 8, the transmission gear 9, the sleeve 10, and the like, which constitute the driven gear group 11, well-known components can be used. Therefore, these further detailed descriptions will be omitted.

As the counter shaft 5, the primary drive gear 12, and the transmission gear 13 constituting the drive gear group 14, those having a well-known technique can be used as the component configuration for the power transmission function.

The primary driven gear 8 and the transmission gear 9, and the primary drive gear 12 and the transmission gear 13 have substantially the same function of realizing power transmission to the shafts 2, 3, 4, and 5, and have diameters (gears). Gear characteristics such as ratio) and thickness are appropriately different. Therefore, in the following description, the relationship between the transmission gear 9 and the transmission gear 13 will be mainly described, and in the relationship between the primary driven gear 8 and the primary drive gear 12, only the corresponding reference numerals are given in parentheses for details. The explanation will be omitted.

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

The gear teeth 13c (12c) are meshed with the gear teeth 9a (8a) formed on the outer peripheral surface of the transmission gear 9 (and the primary driven gear 8). The meshing of the gear teeth 9a (8a) and the gear teeth 13c (12c) may be by either a spur gear or a helical gear.

As shown in FIG. 2, a filter for purifying the lubricating oil OL is provided on the wall surfaces of both cases facing the transmission gear 9 (8) and the transmission gear 13 (12) as rotating bodies arranged in the storage space 15 in the radial direction. 20 and 21 are arranged respectively.

The lower portions of the filters 20 and 21 are immersed in the lubricating oil OL, and for example, the filters 20 are arranged on the side of the upper end of the transmission gear 9 (8) so as to be in the counter direction with respect to the rotation direction. The upper edge is located above the upper end of the transmission gear 9 (8). Similarly, the upper edge of the filter 21 arranged on the side facing the counter direction with respect to the rotation direction at the upper end of the lower transmission gear 13 (12) is located above the upper end of the transmission gear 13 (12). ing.

The filter 20 is a substance that is provided directly on the wall surface of the case with an adhesive or the like, has water absorption, and can collect and filter impurities contained in the lubricating oil OL. For example, a foam such as a sponge. A filter assembly incorporating a felt-like filter, a filter assembly coated with a non-reactive material containing polytetrafluoroethylene (PTFE) or the like can be used. When a foam is used for the filter 20, it may be a synthetic foam or the like containing activated carbon or the like having a high collection (adsorption) effect of impurities.

As described above, the lubricating oil purifying device of the transmission 1 according to the present embodiment has filters 20 and 21 on the case wall surface facing the transmission gears 9 (8) and the transmission gears 13 (12), which are rotating bodies, in the radial direction. By directly arranging the filters 20, the filter 20 can be efficiently arranged in the narrow storage space 15, and the lubricating oil splashed up by the plurality of gears can be efficiently collected. Specifically, it is a lubricating oil purifying device of the transmission 1 in which the lubricating oil OL is stored in the storage space 15, and has the diameters of the transmission gears 9 (8) and the transmission gears 13 (12) arranged in the storage space 15. Filters 20 and 21 for purifying the lubricating oil OL are arranged on the wall surfaces of the cases facing each other in the direction.

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 the rotational force transmitted from the engine (not shown). The rotational force from the input shaft 2 is transmitted to the counter shaft 5 by meshing between the gear teeth 8a of the primary driven gear 8 and the gear teeth 12c of the primary drive gear 12.

When the counter shaft 5 rotates, the gear teeth 9a of the transmission gear 9 and the gear teeth 13c of the transmission gear 13 corresponding to the transmission gear 9 mesh with each other and rotate with each other. Then, the sleeve 10 is displaced on the shaft of the main shaft 3 according to the number of gears to connect the corresponding transmission gear 9 and the main shaft 3, and the rotational force of the counter shaft 5 is transferred to the output shaft 4 via the main shaft 3. Be transmitted.

Here, about the lower half of the transmission gear 13 (12) is immersed in the lubricating oil OL stored in the storage space 15. Therefore, the speed change gear 13 (12) scrapes up the lubricating oil OL as it is as it rotates, and mainly supplies the scraped up lubricating oil OL1 to the speed change gears 9 (8) that mesh with each other. The lubricating oil OL1 includes one that adheres to the gear teeth 9a (8a) of the transmission gear 9 (8) while being attached to the gear teeth 13c (12c) due to surface tension.

On the other hand, in the transmission gear 9 (8) and the transmission gear 13 (12), for example, a part of the lubricating oil OL2 scraped up by the transmission gear 13 (12) is transferred to the transmission gear 9 (8). May go straight to the opposite case wall surface in the radial direction. Further, on the downstream side in the rotational direction in which the speed change gear 9 (8) and the speed change gear 13 (12) mesh with each other, the lubricating oil OL3 bounced off mainly by the speed change gear 9 (8) goes directly to the case wall surface facing in the radial direction. In some cases. Further, even on the upper end side of the speed change gear 9 (8), the lubricating oil OL4 bounced off by the speed change gear 9 (8) may directly head toward the case wall surface facing in the radial direction.

However, in each of these lubricating oils OL2 to OL4, the filters 20 and 21 are arranged on the case wall surfaces facing each other in the counter direction in the rotation direction, and the upper ends of the transmission gears 9 (8) and the transmission gears 13 (12) are arranged. The upper edges of the filters 20 and 21 arranged on the side facing the counter direction with respect to the rotation direction in the above are located above the upper ends of the transmission gears 9 (8) and the transmission gears 13 (12). That is, the filter 20 is arranged in the counter direction with respect to the rotation direction at the upper end of the transmission gear 9 (8) located in the upper stage, and the upper edge thereof is located above the upper end of the transmission gear 9 (8). .. Similarly, the filter 21 is arranged in the counter direction with respect to the rotation direction at the upper end of the transmission gear 13 (12) located in the lower stage, and the upper edge thereof is located above the upper end of the transmission gear 13 (12). There is.

As a result, the filters 20 and 21 can efficiently collect the lubricating oils OL2 to OL4 that have been bounced up (bounced off) by the transmission gears 9 (8) and the transmission gears 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 reduced to the lubricating oil OL stored in the storage space 15 while being purified (filtered) as they are. .. Further, the filters 20 and 21 in the portion immersed in the lubricating oil OL stored in the storage space 15 generate convection due to the stirring action accompanying the rotation of the transmission gear 13 (12), and the lubricating oil OL is purified by this convection. Can be (filtered).

By the way, the lubricating oil purifying device for the transmission of the present invention is not limited to the above-described embodiment, and the technical scope described in the claims varies within a range that does not deviate from the gist of the invention. , Includes redesigned forms.

For example, the height of the filter 21 may be the same as that of the filter 20. Further, the materials of the filter 20 and the filter 21 may be different.

1 ... Transmission 2 ... Input shaft 3 ... Main shaft 4 ... Output shaft 5 ... Counter shaft 6 ... Clutch housing (case)
7 ... Transmission case (case)
8 ... Primary driven gear (rotating body)
9 ... Transmission gear (rotating body)
12 ... Primary drive gear (rotating body)
13 ... Transmission gear (rotating body)
15 ... Storage space (inside the case)
20 ... Filter 21 ... Filter OL ... Lubricating oil

Claims (3)

It is a lubricating oil purification device for transmissions in which lubricating oil is stored inside the case.
Inside the case, and the lubricating oil, and a plurality of rotating bodies, a pair of filters for purifying the lubricating oil is arranged,
The plurality of rotating bodies include a first rotating body immersed in lubricating oil and a second rotating body that meshes with the first rotating body and is arranged above the first rotating body.
The pair of filters are directly arranged from the upper edge to the lower edge along the case wall surfaces on both sides facing the rotating body in the radial direction, and only the lower portion of the pair of filters is stored in the lubrication. The upper edge of the filter, which is immersed in oil and is in the counter direction with respect to the rotation direction at the upper end of the first rotating body, is located above the first rotating body, and the second rotating body is located above the first rotating body. The upper edge of the filter in the counter direction with respect to the rotation direction at the upper end of the filter is located above the second rotating body.
Lubricating oil purification device for transmissions. The rotating body is a gear
The lubricating oil purification device for a transmission according to claim 1. The filter is composed of a substance having water absorption and capable of collecting and filtering impurities contained in the lubricating oil.
The lubricating oil purification device for a transmission according to claim 1 or 2.

Images