JP2864444B2 - Lubricating device for tandem drive shaft - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tandem drive shaft lubrication device for a vehicle.

[0002]

2. Description of the Related Art In a tandem drive shaft such as a rear two-shaft drive truck, a driving force from an engine is transmitted to two rear shafts, a front front shaft and a rear rear shaft, so that a rotational difference between the two shafts is absorbed. An interaxle differential is used for this. Conventionally, an interaxle differential and a transfer are arranged in a transfer case and a differential carrier case of a tandem drive shaft, and in order to improve lubrication of an interaxle differential portion, an oil pump, a drive shaft for the oil pump, piping, and a strainer. Such components are additionally provided, and forced oil lubrication is performed to forcibly send oil to an interaxle differential portion and the like. (For example, see Japanese Utility Model Application Laid-Open No. 3-1146663.) In the forced oil lubrication of the tandem drive shaft, components for forced lubrication are provided, so that the structure is complicated and the cost is greatly increased. is there.

Further, an interaxle differential and a transfer are provided in a transfer case of a tandem drive shaft, and an oil connecting between a surface of the drive gear and an inner peripheral surface is provided to improve lubrication of the interaxle differential portion and the like. Form a path,
The lubricating oil in the axle housing is scraped up by a ring gear (reduction gear), and the lubricating oil is dropped from above the interaxle differential through the oil passage. (See, for example, Japanese Utility Model Application Laid-Open No. Hei 3-11163.) This device for scraping lubricating oil onto a tandem drive shaft by a ring gear and having a simple structure is inexpensive. The amount of lubricating oil supplied was not sufficient, and there was a risk of seizure damage.

[0004]

SUMMARY OF THE INVENTION The present invention relates to a lubricating device for a tandem drive shaft, which does not use an oil pump as in the conventional forced lubrication, but lubricates a conventional lubricating oil which is lifted up by a ring gear and fed. It is an object of the present invention to improve performance and perform forced lubrication of lubricating oil with a relatively simple structure.

[0005]

According to the present invention, an interaxle differential and a transfer are provided in a transfer case, a drive gear of the transfer is rotatably supported on an outer peripheral surface of an input shaft, and a front of the interaxle differential is provided. In a lubricating device for a tandem drive shaft in which an inter differential gear is formed integrally with a drive gear, a through shaft is connected to a rear inter differential gear of an inter axle differential, and the through shaft is disposed so as to cross in the axle housing in the front-rear direction. An impeller is disposed between the outer peripheral surface of the cylindrical portion of the rear inter differential gear and the inner peripheral surface of the lubricating oil receiving portion, and a gap between the rear end surface of the input shaft and the front end surface of the through shaft is formed in the cylindrical portion. The communication passage communicates with the front portion of the impeller, and the outer peripheral surface of the cylindrical portion and the inner periphery of the lubricating oil receiving portion are provided in front of the communication passage. Between is sealed, the gap is a technical means that communicates with the sliding portion of the inter axle differential via the oil passage.

[0006]

When the input shaft is driven and a rotation difference occurs between the input shaft and the through shaft, relative rotation occurs between the input shaft and the drive gear / rear differential gear. Then, the impeller on the outer periphery of the cylindrical portion of the rear differential gear rotates, and the lubricating oil is fed by the impeller into the gap between the rear end surface of the input shaft and the front end surface of the through shaft through the communication passage of the cylindrical portion. , And further fed into the sliding portion of the interaxle differential through an oil passage.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. The front transfer case 11, the middle differential carrier case 13, and the rear axle housing 12 are sequentially connected to each other, and a bearing 30 at the upper front end of the transfer case 11 is connected.
A front portion of an input shaft (drive shaft) 1 is pivotally supported. The spider 15 of the interaxle differential 3 is connected near the rear end of the input shaft 1, and the drive gear 2 of the transfer is supported on the outer peripheral surface of the input shaft 1 in front of the interaxle differential 3. The spider 15 of the interaxle differential 3 has an inter differential pinion 16
Are supported, and the inter differential pinion 16 is
Meshes with a front inter-differ gear 17 and a rear inter-diff gear 18 integrally formed on the rear surface. Thus, the interaxle differential 3 is composed of the spider 15 and the inter differential pinion 1.
6, front inter differential gear 17 and rear inter differential gear 1
8 etc. A partition wall 20, a lubricating oil receiving portion 29, an oil reservoir 33, a bearing support portion 56, and the like are formed in the differential carrier case 13, and a bearing 21 above the partition wall 20 is provided with a cylindrical portion 19 of the rear inter differential gear 18. The outer periphery is pivotally supported, and the rear end of the input shaft 1 is rotatably supported on the inner peripheral surface of the cylindrical portion 19. The driven shaft 23 is provided by the bearing 22 at the lower portion of the partition wall 20 and the pilot bearing 25 of the bearing support portion 56 at the rear thereof.
, And a driven gear 24 connected to the front end of the driven shaft 23 meshes with the drive gear 2. Ring gear 4 in axle housing 12 and differential carrier case
The hypoid pinion 26 connected to the rear end of the driven shaft 23 meshes with the ring gear 4, and the ring gear 4 is connected to the rear front shaft via a mechanism (not shown). Transfer case 11, differential carrier case 13
A lubricating oil 28 is stored in a lower portion of the axle housing 12. The shifter sleeve 27 is engaged with a gear formed integrally with the outer periphery of the input shaft 1 at the front side of the drive gear 2, and the shifter sleeve 27 is moved toward the drive gear 2, whereby the input shaft 1 and the drive gear 2 are moved. And can be directly connected.

A front end of a through shaft 31 is connected to the inner peripheral surface of the rear half (side gear) of the cylindrical portion 19 of the rear differential gear 18 via a spline or the like so as to be capable of transmitting power. The rear end of the through shaft 31 is supported by a bearing 32 at the upper rear end of the axle housing 12. The lubricating oil receiving portion 29 is provided outside the cylindrical portion 19 of the rear differential gear 18, and the oil reservoir 33 is provided below the cylindrical portion 19,
The lubricating oil 28 scooped up by the ring gear 4 flows into the oil reservoir 33 from above the lubricating oil receiving portion 29 and the right end opening of the oil reservoir 33. As shown in FIG. 2, the rear end surface of the input shaft 1 in the cylindrical portion 19 of the rear differential gear 18.
A gap 34 is provided between 39 and the front end face 40 of the through shaft 31. A plurality of communication passages (oil holes) 41 communicating the gap 34 in the cylindrical portion 19 and the outside of the cylindrical portion 19 are formed in the cylindrical portion 19,
At a position on the outer periphery of the cylindrical portion 19 and immediately in front of the communication passage 41,
The inner periphery of the annular support member 57 is fixed. An annular oil seal 58 is fixed to the outer peripheral portion of the support fitting 57, and a front portion of the tip of the oil seal 58 is in contact with the inner peripheral surface of the lubricating oil receiving portion 29, and the cylindrical portion is formed by the support fitting 57 and the oil seal 58. The space between 19 and the lubricating oil receiving portion 29 is sealed. At the position on the outer periphery of the cylindrical portion 19 and slightly behind the communication passage 41, the inside of a mounting bracket 59 having an annular L-shaped cross section is fixed, and a number of impellers 60 are fixed outside the mounting bracket 59. You. With the impeller 60, the space between the cylindrical portion 19 and the lubricating oil receiving portion 29 is divided into a room 61 behind the impeller 60 and a room 62 ahead of the impeller 60.
The rear of the chamber a reaches the opening at the right end of the lubricating oil receiving portion 29 and the oil reservoir 33, and the chamber b communicates with the gap through the communication passage 41. In the center of the input shaft 1, a longitudinal oil passage 8 in the front-rear direction communicating with a rear end surface 39 is formed.
The inlet hole 63 is opened at the rear end, and the rear half of the inlet hole 63 has a large-diameter cylindrical shape, and the front half has a frusto-conical shape with a diameter decreasing toward the front. An annular recess 35 is formed on the inner peripheral surface of the drive gear 2, and a plurality of first horizontal oil passages 64 in the radial direction connecting the annular recess 35 and the front end of the vertical oil passage 8 are formed. A plurality of second horizontal oil passages 65 in the radial direction are formed connecting the rear portion of the input shaft 1 and the outer peripheral surface of the input shaft 1.

The operation of the embodiment of the present invention will be described.
The driving force from the engine is transmitted to the input shaft 1 via a transmission, a front propeller shaft (not shown), and a flange coupling 10, and the input shaft 1 rotates. The rotation of the input shaft 1 is transmitted to the front differential gear 17 and the rear differential gear 18 via the spider 15 and the differential pinion 16 of the interaxle differential 3. The rotation of the front differential gear 17 includes the drive gear 2, the driven gear 24, the driven shaft 23, the hypoid pinion 26, and the ring gear 4.
And transmitted to the rear front axle via a transmission mechanism (not shown).
The rotation of the rear differential gear 18 is transmitted to the rear rear axle via the cylindrical portion 19, the through shaft 31, and a tandem propeller shaft (not shown). When a difference in rotation occurs between the rear front axle and the rear rear axle during cornering or the like, the inter differential pinion 16 rotates to absorb this rotation difference.

The rotation of the input shaft 1 causes the ring gear 4 to rotate, and the lubricating oil scooped up by the ring gear 4 flows from above the lubricating oil receiving portion 29 and the right end opening of the oil reservoir 33 into the a chamber 61 and the oil reservoir. It flows into 33. The lubricating oil that has flowed into and filled the chamber 61 and the oil reservoir 33 is rotated by the rotation of the impeller 60 and the chamber 62 is rotated.
Sent to. Since the space between the cylindrical portion 19 and the lubricating oil receiving portion 29 is sealed by the support fitting 57 and the oil seal 58, the lubricating oil sent to the b chamber 62 passes through the communication passage 41 and passes through the inlet of the input shaft 1. Hole 63, vertical oil passage 8, first horizontal oil passage
64, and flows into the second horizontal oil passage 65. And the vertical oil passage 8, the first
The pressure of the lubricating oil flowing into the horizontal oil passage 64, the second horizontal oil passage 65, and the like increases according to the rotation speed of the input shaft 1. Accordingly, lubricating oil having a desired pressure is fed from the first horizontal oil passage 64 into the annular recess 35 and supplied to the sliding portion between the inner peripheral surface of the drive gear 2 and the outer peripheral surface of the input shaft 1, In addition, the oil is supplied from the second horizontal oil passage 65 to sliding portions between the inner peripheral surface of the rear differential gear 18 and the cylindrical portion 19 and the outer peripheral surface of the input shaft 1 to ensure lubricity of these sliding portions. Since the supply amount of the lubricating oil supplied to the sliding portion increases according to the rotation speed of the input shaft 1, the lubrication oil is sufficiently lubricated even when the input shaft 1 rotates at a high speed.

[0011]

According to the present invention, in a lubricating device for a tandem drive shaft, an impeller is disposed between an outer peripheral surface of a cylindrical portion of a rear inter differential gear and an inner peripheral surface of a lubricating oil receiving portion, and a rear end surface of an input shaft is provided. And a gap between the through shaft front end face is communicated with the impeller front part by the communication passage of the cylindrical part,
The space between the outer peripheral surface of the cylindrical portion and the inner peripheral surface of the lubricating oil receiving portion is sealed in front of the communication passage, and the gap communicates with the sliding portion of the interaxle differential via an oil passage. The impeller on the outer periphery of the cylindrical portion rotates, and lubricating oil is sent by the impeller through the communication passage of the cylindrical portion to the gap between the rear end surface of the input shaft and the front end surface of the through shaft, and further passes through the oil passage. Into the sliding part of the interaxle differential. Since the space between the outer peripheral surface of the cylindrical portion and the inner peripheral surface of the lubricating oil receiving portion is sealed in front of the communication passage, the pressure of the lubricating oil sent by the impeller increases, and the sliding portion of the interaxle differential Is forcibly lubricated.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention.

FIG. 2A is an enlarged view of a main part of FIG. 1, and FIG.
FIG. 3 is a view of the impeller as viewed from the direction of arrow A.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Input shaft 2 Drive gear 3 Inter axle differential 8 Vertical oil path 11 Transfer case 12 Axle housing 13 Differential carrier case 17 Front inter differential gear 18 Rear inter differential gear 19 Cylindrical part 29 Lubricating oil receiving part 31 Through shaft 34 Gap 41 Communication passage 60 Blade Car 64 1st horizontal oilway 65 2nd horizontal oilway

──────────────────────────────────────────────────続 き Continued on the front page (56) References Japanese Utility Model 3-114663 (JP, U) Japanese Utility Model 3-11163 (JP, U) Japanese Utility Model 55-92523 (JP, U) Japanese Utility Model 62 194242 (JP, U) Japanese Utility Model Hei 4-32354 (JP, U) Japanese Utility Model Application 57-33357 (JP, U) Japanese Utility Model Utility Model 52-51945 (JP, U) Japanese Utility Model Utility Model 53-20620 (JP, Y1) (58) Field surveyed (Int.Cl. ⁶ , DB name) F16H 57/04 B60K 17/36

Claims (1)

(57) [Claims] An interaxle differential and a transfer are provided in a transfer case, a drive gear of the transfer is rotatably supported on an outer peripheral surface of an input shaft, and a front inter differential gear of the interaxle differential is integrated with the drive gear. A through shaft is formed and connected to a rear inter differential gear of the inter axle differential, and in a tandem drive shaft arranged so that the through shaft traverses in the axle housing in the front-rear direction, the outer peripheral surface of the cylindrical portion of the rear inter differential gear is formed. An impeller is arranged between the inner peripheral surface of the lubricating oil receiving portion and a gap between the rear end surface of the input shaft and the front end surface of the through shaft is communicated with the front portion of the impeller through a communication passage of the cylindrical portion. The space between the outer peripheral surface of the cylindrical portion and the inner peripheral surface of the lubricating oil receiving portion is sealed in front of the communication passage, and the gap forms an oil passage. A lubricating device for a tandem-type drive shaft, wherein the lubricating device is connected to a sliding portion of an interaxle differential through a shaft.