JPH0721956Y2 - Lubrication device for transfer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a transfer lubricating device.

[Conventional technology]

Generally, a transfer of a four-wheel drive vehicle includes a center differential (hereinafter referred to as a center differential) that absorbs a difference in rotation between front and rear wheels that occurs during turning, and a two- and four-wheel switching device that switches between two-wheel drive and four-wheel drive. Etc. are provided.

By the way, the transfer case is fixed to the rear part of the transmission case, and the transfer case and the transmission case form an independent chamber. Therefore, it is necessary to lubricate the center differential and the 2/4 wheel switching device with the oil accumulated in the transfer case. In this case, even if the lubricating oil is sprinkled from the outside of the center differential, the lubricating oil only scatters due to the centrifugal force, and the side gears and pinions provided inside cannot be efficiently lubricated. So, for example, Jitsuko Sho 63-14134
As described in the publication, there is a method in which a scooping plate is attached to the transfer shaft, the oil scooped up by the scooping plate is guided to the shaft center hole of the transfer shaft, and the center differential is lubricated from the inside.

[Problems to be solved by the device]

However, with the above-described lubrication method, the amount of hot water that can be supplied by the lift plate is limited, and therefore the risk of seizure of the center differential cannot be completely eliminated.

Therefore, an oil pump is provided in the transfer, and the oil is forcibly supplied from the oil pump to the lubrication site through the shaft hole. In this case, there is an advantage that a sufficient amount of oil can be supplied to the lubricated part, but if the oil level in the transfer changes while traveling on a steep slope or a steep slope, air will be drawn from the suction port of the oil pump. It may be sucked and cause problems such as poor lubrication, abnormal noise, seizure and wear of the oil pump. Particularly, in the case of a chain drive type transfer, there is a problem that the performance of the oil pump is deteriorated because the chain easily agitates the oil accumulated in the transfer to cause bubbling and increase in oil temperature.

Therefore, an object of the present invention is to provide a transfer lubrication device that can solve the above-mentioned problems.

[Means for Solving the Problems]

To achieve the above object, the present invention transmits the driving force of an output shaft of a transmission to one of front wheels or rear wheels via a transfer shaft and to the other of front wheels or rear wheels via a chain. In the transfer, an oil pump driven by the output shaft of the transmission is provided, and the oil located at the bottom of the transfer case is partitioned by the chain arrangement part and the partition plate and is located above the bottom surface of the chain arrangement part. A reservoir is formed, the suction port of the oil pump is connected to a strainer arranged at the bottom of the oil reservoir, and the discharge port of the oil pump is routed through the shaft center hole of the output shaft and the shaft center hole of the transfer shaft. The oil sump is placed below the lubrication part so that most of the oil supplied to the lubrication part falls into the oil sump. It is intended.

[Action]

The oil pump sucks oil from an oil reservoir provided at the bottom of the transfer case, and supplies the oil to the lubricated portion through the shaft center hole of the output shaft and the shaft center hole of the transfer shaft.
Since the oil reservoir is partitioned by the chain arrangement part and the partition plate, the effect of oil bubbling due to the stirring of the chain can be reduced and the performance of the oil pump is not deteriorated.

Further, since the oil sump is located above the bottom of the chain arrangement, the lift of the oil pump can be reduced, and even a small oil pump can sufficiently suck up oil.

Furthermore, since most of the oil dropped from the lubrication area is received by the oil sump, the oil surface of the oil sump can be secured, air intake can be prevented, and the bottom of the chain arrangement part Only a comparatively small amount of oil accumulates, and the resistance to stirring the oil by the chain can be reduced.

〔Example〕

 The drawing shows an example of a transfer to which the present invention is applied.

An output shaft 4 is rotatably supported on the rear transmission case 1 via bearings 2 and 3. Incidentally, 5 is an oil seal for sealing the inside and outside of the transmission case 1, and 6 is a fifth speed gear.

A hub 7 is spline-fitted to the rear end of the output shaft 4, and is fixed by tightening a nut 8. Transmission case 1
A pump body 10 is fixed to a rear end surface of the pump body 10 via a plate 9, and an internal gear type oil pump 11 is housed inside the pump body 10. This oil pump 11
Is driven by the hub 7, the suction port 11a is connected via a pipe 13 to a strainer 12 arranged at the bottom of an oil reservoir 26a described later, and the discharge port 11b is connected to the shaft center hole 4a of the output shaft 4. It is in communication.

The hub 7 is connected to the case 16 of the center differential 15 by a spline, and the center differential case 16 rotates integrally with the output shaft 4. In the center differential case 16, a pinion 18 is rotatably supported via a pinion shaft 17, and one side gear 19 meshing with the pinion 18 is a center differential 15.
It is spline-fitted with the transfer shaft 20 that penetrates through. The other side gear 21 is spline-fitted with a hub 22 arranged on the right side of the center differential 15, and the center differential case 16 and the hub 22 can be selectively coupled by a differential lock switching sleeve 23. A drive side sprocket 24 is rotatably arranged on the right side portion of the hub 22, and the hub 22 and the drive side sprocket 24 can be selectively connected by a sleeve 25 for switching between 2 and 4 wheels.

The center differential case 16 and the transfer shaft 20 are rotatably supported by the transfer cases 26, 27, 28 via bearings 29, 30. The rear end of the transfer shaft 20 is connected to the rear wheel via a transmission shaft (not shown). A front wheel drive shaft 33, which is parallel to the transfer shaft 20, is rotatably supported under the transfer cases 26 and 27 via bearings 31 and 32, and the shaft 33 is connected to the front wheels.
A driven side sprocket 34 is integrally formed on the front wheel drive shaft 33, and a chain 35 is formed on the drive side sprocket 24.
And the driven side sprocket 34. The chain 35 is housed in a chain arrangement portion 40 formed between the transfer cases 26 and 27.

The oil discharged from the oil pump 11 is discharged to the shaft center hole 4a of the output shaft 4 as described above, and further transferred to the transfer shaft.
It is supplied to the inside of the center differential 15, the inner diameter portion of the hub 22, the inner diameter portion of the drive side sprocket 24 and the like through the shaft center hole 20a of 20. In addition, the plate 9 that supports the side surface of the oil pump 11
A small-diameter oil hole 9a is formed in the oil pump 11
A part of the discharged oil is leaked from the oil hole 9a to lubricate the adjacent bearing 3 and oil seal 5. In order to lubricate the bearing 3 and the oil seal 5, a lubricating hole 4b continuous with the shaft center hole 4a of the output shaft 4 may be formed as shown by the broken line.

A partition plate 36 is fixed to the bottom of the transfer case 26 to partition the chain arrangement portion 40 and the oil sump portion 26a. The oil sump portion 26a is positioned substantially below the lubrication portion so that the oil that has fallen from the lubrication portion on the transfer shaft 20 (the inside of the center differential 15, the inner diameter portion of the hub 22, etc.) can be received. When traveling on a horizontal road, the oil level L is secured inside the transfer cases 26, 27. However, when traveling on a steep slope or a steep slope, the oil level changes like L'and the strainer May inhale air from 12. Also, if the chain 35 is deeply immersed in oil,
The drive loss is large, and there is a possibility that foaming or oil temperature rise due to oil agitation may occur. Therefore, strainer 12
Is arranged in the oil sump 26a which is partitioned from the chain arrangement part 40, and the partition plate 36 is arranged in the oil sump 26a.
By fixing it to the rear side, the oil surface of a certain depth is secured in the strainer 12 part even when traveling on a steep slope or a steep slope, and the oil level of the chain arrangement part 40 is lowered, and the chain 35 The influence on the oil pump 11 by the stirring of is reduced. The partition plate 36 also functions as a support plate that supports the strainer 12 via the bracket 37.

Further, since the oil sump 26a is located above the bottom of the chain disposition part 40 and the strainer 12 is disposed in this oil sump 26a, the lift of the oil pump 11 can be reduced, and even a small oil pump can be used. Can absorb enough oil.

The transfer of the present invention is not limited to the one in which the center differential is provided on the transfer shaft, and other mechanism such as high
It can also be applied to those provided with a low speed switching mechanism or the like.

[Effect of device]

As is apparent from the above description, according to the present invention, the oil pump sucks oil from the oil sump portion provided at the bottom of the transfer case, and the oil sump portion includes the chain arrangement portion and the partition plate. Since it is partitioned by, the oil reservoir is unlikely to be affected by the foaming of oil by the chain.

Further, since the oil sump portion is located above the chain arrangement portion, the lift of the oil pump can be reduced, and even a small oil pump can sufficiently suck up oil.

Furthermore, since most of the oil supplied to the lubricated part falls into the oil sump, the oil level in the oil sump can always be secured, problems due to air suction can be eliminated, and the chain layout can be improved. Only a relatively small amount of oil accumulates at the bottom of the section, and the oil agitation resistance due to the chain can be reduced.

[Brief description of drawings]

The drawing is a cross-sectional view of an example of a transfer to which the present invention is applied. 1 ... Transmission case, 4 ... Output shaft, 4a ... Shaft center hole, 10
...... Pump body, 11 …… Oil pump, 11a …… Suction port, 11b …… Discharge port, 12 …… Strainer, 13 …… Piping, 15 …… Center differential, 20 …… Transfer shaft, 20a…
… Axial hole, 26,27,28 …… Transfer case, 26a ……
Oil sump, 35 …… Chain, 40 …… Chain arrangement part.

Claims (1)

[Scope of utility model registration request] 1. A transfer in which a driving force of an output shaft of a transmission is transmitted to one of front wheels or rear wheels via a transfer shaft and to the other of the front wheels or rear wheels via a chain. An oil pump driven by the output shaft is provided, and an oil sump portion is formed at the bottom of the transfer case, the oil sump portion being partitioned by the chain arrangement portion and the partition plate and located above the bottom surface of the chain arrangement portion. The suction port of the oil pump is connected to the strainer arranged at the bottom of the oil reservoir, and the discharge port of the oil pump is connected to the lubricated portion through the shaft hole of the output shaft and the shaft hole of the transfer shaft, A transfer lubrication device in which an oil sump is disposed below the lubrication part so that most of the oil supplied to the lubrication part falls into the oil sump. .