JP5038208B2 - Lubrication structure in transmission - Google Patents

Description

  The present invention relates to a lubricating structure in a transmission for a four-wheel drive mounted on a snowplow, for example.

The applicant of the present application has devised a lubrication structure for this type of transmission (transmission), and has previously filed a patent application (see, for example, Patent Document 1).
JP 2006-275136 A

  In the transmission described in Patent Document 1, the first input shaft, the intermediate shaft, and the intermediate output shaft are arranged in the main gear case so as to be parallel to each other, and the first input shaft connected to the engine rotates. Is transmitted to the intermediate shaft and the intermediate output shaft through a plurality of multi-plate transmission clutches and a plurality of gears linked thereto, and the rotation of the intermediate output shaft is accommodated in the main gear case through the plurality of gears. The transmission is transmitted to the first output shaft for driving the rear wheels and the second output shaft for driving the front wheels housed in the auxiliary gear case.

In this way, when having two gear cases, a plurality of external pipes for supplying lubricating oil to them must be connected between the main gear case itself and the main gear case and the sub gear case, The number of parts and piping man-hours increase, resulting in high costs and a complicated lubrication system.
In order to cope with this problem, in the one described in Patent Document 1, an oil hole is provided in a positioning pin for the main gear case and the sub gear case, and the sub gear case is lubricated by a hydraulic circuit provided in the main gear case. Oil is supplied.

In addition, if there are two gear cases, the two gear cases must be manufactured individually, and the number of parts and assembly man-hours increase, so the applicant of the present application solves this problem. For this purpose, a transmission has been devised in which a first output shaft and a second output shaft are accommodated in a single gear case so that the second output shaft is aligned with the intermediate shaft.
However, when the first and second output shafts are accommodated in one gear case in this way, the second output shaft and the like protruding from the gear case become an obstacle, and a lubrication path can be easily formed inside the gear case. Since this becomes difficult, there arises a problem that a plurality of lubrication paths must be provided by increasing the number of external pipes.

  The present invention has been made in view of the above-described problems, and the first output shaft and the second output shaft are accommodated in one gear case so that the second output shaft is aligned on the same axis as the intermediate shaft. Regardless, it is an object of the present invention to provide a lubrication structure in a transmission that can easily form a lubrication path for lubricating a speed change clutch and the like inside a gear case, reduce external piping, and reduce costs. Yes.

According to the present invention, the above problem is
A first input shaft, an intermediate shaft, and an intermediate output shaft are arranged in the gear case so as to be parallel to each other, and the rotation of the first input shaft linked to an engine or the like is caused to rotate with a plurality of shift clutches and a plurality of linked gears. A first output shaft that is transmitted to the intermediate shaft and the intermediate output shaft through the gear, and the rotation of the intermediate output shaft is parallel to the intermediate output shaft, and a first output shaft that is aligned on the same axis as the intermediate shaft. A lubricating structure in a transmission that can transmit to two output shafts,
A first servo case is mounted on the outer surface of one end plate in the axial direction of the gear case, and a second servo case is mounted on the outer surface of the other end plate, respectively, and one end portion of the first input shaft and the intermediate shaft is mounted. Each of the first servo case and the second servo case is housed in the first servo case and the second servo case, and both end portions of the intermediate output shaft are housed in the first servo case and the second servo case, respectively. The oil passages provided in the case are communicated with each other via an axial oil passage provided in the intermediate output shaft, and either one of the first servo case and the second servo case is provided. Is supplied to an oil passage facing in the axial direction provided inside the first input shaft and the intermediate shaft so as to communicate with those oil passages, and the lubricating oil is supplied from an opening end of the oil passage. The plurality of shift clutches and By so as to lubricate the various members within Yakesu, it is solved.

According to the present invention, the oil passages of the first servo case and the second servo case attached to the end plate of the gear case are communicated with each other by the oil passage facing the axial direction provided in the intermediate output shaft, Since the lubricating oil introduced into one of the oil passages of the second servo case is supplied to the oil passage facing the axial direction provided inside the first input shaft and the intermediate shaft, Even if the first output shaft and the second output shaft are accommodated so that the second output shaft is aligned on the same axis as the intermediate shaft, a lubricating path for lubricating the speed change clutch or the like is easily formed in the gear case. can do.
As a result, the number of external pipes connected to the gear case is reduced, and costs can be reduced.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a central longitudinal side view in which the present invention is applied to a transmission of a four-wheel drive type snowplow, and includes a gear case 1 and an oil pan 2 attached to the lower end thereof.

  In the upper part of the gear case 1 is a first input shaft 3 that faces in the front-rear direction (the left side in the figure is the front) and has a rear end protruding from the gear case 1 connected to a crankshaft (not shown) of the engine. Both front and rear end portions are supported and accommodated by bearings 4 and 4.

In the gear case 1, the first input gear 5 is fixedly fitted to the rear end portion of the first input shaft 3, and the first input shaft 3 at the front portion can be switched between the third speed and the fourth speed. A high speed transmission clutch 6 comprising a wet multi-plate clutch is provided.
The high speed transmission clutch 6 surrounds the first input shaft 3 and is fitted into a clutch drum 7 fixed to the first input shaft 3 and a front drum 7a opened in front of the clutch drum 7, and is attached to the first input shaft 3 by a bearing 4. A third-speed clutch gear (hereinafter abbreviated as a third-speed gear) 8 having a larger number of teeth than the first input gear 5 and a rear drum that opens to the rear of the clutch drum 7 is supported in a relatively rotatable manner. 4th speed clutch gear (abbreviated as 4th speed gear) having the same number of teeth as the 3rd speed gear 8 and fitted in 7b and rotatably supported by the first input shaft 3 by the bearing 4 It consists of nine.

  In the gear case 1 below the first input shaft 3, an intermediate shaft 10 that is parallel to the first input shaft 3 and shorter than the first input shaft 3 is accommodated with its front and rear ends supported by bearings 4 and 4. ing. The front end portion of the intermediate shaft 10 is supported by the bearing 4 at a position spaced rearward from the front end plate 1 a of the gear case 1.

  A second input gear 11 having a larger number of teeth than the first input gear 3 is fixedly fitted to the rear end portion of the intermediate shaft 10, and the second input gear 11 is engaged with the first input gear 5. A low speed transmission clutch 12 formed of a wet multi-plate clutch capable of switching between the first speed and the second speed is arranged in parallel with the high speed transmission clutch 6 on the intermediate shaft 10 on the front side of the second input gear 11. Is provided. The low-speed transmission clutch 12 and the high-speed transmission clutch 6 constitute a four-speed switching type transmission.

  The low speed transmission clutch 12 surrounds the intermediate shaft 10 and is fitted into a clutch drum 13 fixed to the intermediate shaft 10 and a front drum 13a that opens forward on the front side thereof. A first-speed clutch gear (hereinafter abbreviated as a first-speed gear) 14 that is supported in a relatively rotatable manner and has a smaller number of teeth than the third-speed gear 8, and a rear part on the rear side of the clutch drum 13. The number of teeth is the same as that of the first-speed gear 8 and the number of teeth is smaller than that of the fourth-speed gear 9. The first-speed gear 8 is fitted in the opening rear drum 13 b and is rotatably supported on the intermediate shaft 10 by the bearing 4. A second speed clutch gear (abbreviated as second speed gear) 15 is provided. An intermediate clutch gear 16 having a smaller number of teeth than that is integrally formed with the first speed gear 14.

  In the gear case 1 below the intermediate shaft 10, front and rear end portions of the intermediate output shaft 17 parallel to the intermediate shaft 10 are supported and accommodated by bearings 4 and 4. The intermediate output shaft 17 has an intermediate output gear 18, a first intermediate gear 19 having more teeth than the intermediate clutch gear 16, and fewer teeth than the first intermediate gear 19 in order from the front side. The second intermediate gear 20 is fixedly fitted. The first intermediate gear 19 is engaged with the intermediate clutch gear 16, and the second intermediate gear 20 is engaged with the second speed gear 15 having a smaller number of teeth.

  A first output shaft 21 for driving a rear wheel, which is parallel to the intermediate output shaft 17, is accommodated at the lowermost portion of the gear case 1 with the front and rear ends supported by bearings 4, 4. The fixed rear wheel drive gear 22 is meshed with the intermediate output gear 18 of the intermediate output shaft 17. Note that the number of teeth of the rear wheel drive gear 22 is larger than that of the intermediate output gear 18. The rear end of the first output shaft 21 protruding from the gear case 1 is linked to a drive shaft for driving rear wheels (not shown).

  A support cylinder 23 protruding forward is fixed to the front end plate 1a of the gear case 1 facing the intermediate shaft 10 by press-fitting the rear end portion thereof to the opening 24 of the front end plate 1a. The second output shaft 25 for driving the front wheels is rotatably supported by the front and rear bearings 4 and 4 press-fitted to the inner surface of the support cylinder 23 so as to be aligned on the same axis as the intermediate shaft 10. Yes.

A front wheel drive gear 26 is integrally connected to the rear end of the second output shaft 25, and the front wheel drive gear 26 is meshed with the intermediate output gear 18 of the intermediate output shaft 17. The number of teeth of the front wheel drive gear 26 is slightly larger than that of the intermediate output gear 18.
A concave hole 27 that is recessed forward is formed in the center of the rear surface of the front wheel drive gear 26, and the intermediate shaft 10 and the second output shaft 25 are accommodated in the concave hole 27 by accommodating the front end portion of the intermediate shaft 10. The dimensions in the axial direction are reduced. The front wheel drive gear 26 is supported in a relatively rotatable manner by a bearing 4 whose inner peripheral surface of the concave hole 27 is press-fitted to the outer peripheral surface of the front end portion of the intermediate shaft 10.

  The flange 28 fixed to the front end portion of the front wheel output shaft 25 is linked to a drive shaft for driving front wheels (not shown).

  A control valve (not shown) provided in the hydraulic circuit is switched to supply pressure oil to the low speed transmission clutch 12 or the high speed transmission clutch 6, and the first speed gear 14, the second speed gear 15, When either the third speed gear 8 or the fourth speed gear 9 is selectively connected and rotated, the driving force from any of the gears is applied to the intermediate output gear 18 fixedly fitted to the intermediate output shaft 17. Communicated.

  As a result, the driving force is transmitted to the first output shaft 21 and the second output shaft 25 via the rear wheel drive gear 22 and the front wheel drive gear 26 meshed with the intermediate output gear 18.

  On the front surface of the front end plate 1 a of the gear case 1, a first servo case 29 for supplying lubricating oil having a donut-shaped cross section is mounted so as to surround the second output shaft 25, and upper and lower ends of the first servo case 29. In the bottomed holes 30, 30 that are formed in the rear part and that open to the rear, protruding end portions of the first input shaft 3 and the intermediate output shaft 17 from the front end plate 1 a are rotatable and O-rings (not shown). The sliding contact surfaces of each other are sealed and fitted.

  In the upper part of the first servo case 29, there is a supply oil passage 33 facing in the front-rear direction in which the lubricating oil in the oil pan 2 is supplied by the main external pipe 31 and the external pipe 32 of the lubrication circuit connected in the middle thereof. The front and rear oil passages 34, 34 extending toward the front end of the first input shaft 3 are formed so as to communicate with this. The oil passages 34, 34 are arranged vertically 2 facing the axial direction formed in the first input shaft 3 through front and rear annular oil passages 35, 35 formed on the outer peripheral surface of the front end portion of the first input shaft 3. The oil passages 36, 36 in the row communicate with the front ends of the oil passages 36, 36, respectively. The rear ends of the oil passages 36 and 36 open toward the inside of the front drum 7a and the rear drum 7b in the high speed transmission clutch 6, respectively.

  The lubricating oil supplied from the external pipe 31 to the supply oil passage 32 is, as indicated by arrows, via the oil passages 34 and 34, the annular oil passages 35 and 35, and the oil passages 36 and 36, and the high speed transmission clutch 6. Are fed into the front drum 7a and the rear drum 7b, and their clutch discs are lubricated.

  Before and after the supply oil passage 33 communicates with each other in the direction of the intermediate output shaft 17 formed in the lower portion of the first servo case 29 via an annular oil passage 37 provided in the rear opening surface of the first servo case 29. The two oil passages 38 are also communicated with each other. The oil passages 38, 38 have an axial direction formed over substantially the entire length in the intermediate output shaft 17 through front and rear annular oil passages 39, 39 formed on the outer peripheral surface of the front end portion of the intermediate output shaft 17. The upper and lower two rows of oil passages 40, 40 communicate with the front end portions of the oil passages 40, 40, respectively.

  The rear ends of the intermediate shaft 10 and the intermediate output shaft 17 protrude from the rear end plate 1b of the gear case 1, and these protruding ends open forward in the second servo case 41 mounted on the rear surface of the rear end plate 1b. In the bottomed holes 42 and 42, the sliding contact surfaces are sealed and fitted by an O-ring (not shown).

The second servo case 41 has two rows of front and rear oil passages 43, 43 facing in the vertical direction. The lower ends of the oil passages 43, 43 are front and rear formed on the outer peripheral surface of the rear end portion of the intermediate output shaft 17. Are communicated with the oil passages 40, 40 of the intermediate output shaft 17, respectively.
The upper ends of the oil passages 43, 43 of the second servo case 41 are formed in the intermediate shaft 10 via front and rear annular oil passages 45, 45 formed on the outer peripheral surface of the rear end portion of the intermediate shaft 10, respectively. The upper and lower oil passages 46 and 46 are also communicated with the rear end portions of the upper and lower rows of the oil passages 46 facing the axial direction. The front ends of the oil passages 46 of the intermediate shaft 10 are opened toward the inside of the front drum 13a and the rear drum 13b in the low speed transmission clutch 12, respectively.

  As described above, the lubricating oil supplied from the external pipe 32 to the supply oil passage 33 flows into the oil passage 34 side, and via the annular oil passage 37, the oil passage 38 below the first servo case 29, 38 also flows. The lubricating oil that has flowed into the oil passages 38, 38 is supplied to the second servo via the annular oil passages 39, 39, the oil passages 40, 40, and the annular oil passages 44, 44 of the intermediate output shaft 17 as indicated by arrows. After flowing into the oil passages 43, 43 before and after the case 41, they flow into the upper and lower oil passages 46, 46 via the annular oil passages 45, 45 of the intermediate shaft 10. As a result, the clutch discs in the front drum 13a and the rear drum 13b of the low speed transmission clutch 12 are lubricated.

As explained above, in the transmission lubrication structure of the above embodiment, the oil passages 33, 37, 38 of the first servo case 29 mounted on the front single plate 1a and the rear end plate 1b of the gear case 1 and the second The oil passages 43 of the servo case 41 communicate with each other by an oil passage 40 facing the axial direction provided in the intermediate output shaft 17, and the lubricating oil introduced into the oil passage 33 of the first servo case 29 is supplied to the first input shaft 3. The first output shaft 21 and the second output shaft 25 are connected to one gear case 1 with the second output shaft. Even when 25 is accommodated so as to be aligned on the same axis as the intermediate shaft 10, a lubricating path for lubricating the speed change clutches 6, 12 and the members inside the gear case 1 can be easily formed in the gear case 1. .
As a result, the number of external pipes connected to the gear case 1 is reduced, and the cost can be reduced.

  In the above embodiment, the external servo pipe 32 is attached to the first servo case 29 so that the lubricating oil is supplied to the second servo case 41 side. A pipe may be provided to supply lubricating oil to the first servo case 29 side.

It is a vertical side view of a transmission provided with one embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Gear case 1a Front end plate 1b Rear end plate 2 Oil pan 3 1st input shaft 4 Bearing 5 1st input gear 6 High speed transmission clutch 7 Clutch drum 7a Front drum 7b Rear drum 8 Third speed clutch gear 9 4th Speed clutch gear 10 Intermediate shaft 11 Second input gear 12 Low speed transmission clutch 13 Clutch drum 13a Front drum 13b Rear drum 14 First speed clutch gear 15 Second speed clutch gear 16 Intermediate clutch gear 17 Intermediate output shaft 18 Intermediate output gear 19 First intermediate gear 20 Second intermediate gear 21 First output shaft 22 Rear wheel drive gear 23 Support cylinder 24 Opening 25 Second output shaft 26 Front wheel drive gear 27 Concave hole 28 Flange 29 First servo case 30 Bottomed Hole 31 External piping 32 External piping 33 Supply oil passage 34 Oil passage 35 Annular oil passage 36 Oil passage 37 Annular oil passage 38 oil passage 39 annular oil passage 40 oil passage 41 second servo case 42 bottomed hole 43 oil passage 44 annular oil passage 45 annular oil passage 46 oil passage

Claims (1)

A first input shaft, an intermediate shaft, and an intermediate output shaft are arranged in the gear case so as to be parallel to each other, and the rotation of the first input shaft linked to an engine or the like is caused to rotate with a plurality of shift clutches and a plurality of linked gears A first output shaft that is transmitted to the intermediate shaft and the intermediate output shaft through the gear, and the rotation of the intermediate output shaft is parallel to the intermediate output shaft, and a first output shaft that is aligned on the same axis as the intermediate shaft. A lubricating structure in a transmission that can transmit to two output shafts,
A first servo case is mounted on the outer surface of one end plate in the axial direction of the gear case, and a second servo case is mounted on the outer surface of the other end plate, respectively, and one end portion of the first input shaft and the intermediate shaft is mounted. Each of the first servo case and the second servo case is housed in the first servo case and the second servo case, and both end portions of the intermediate output shaft are housed in the first servo case and the second servo case, respectively. The oil passages provided in the case are communicated with each other via an axial oil passage provided in the intermediate output shaft, and either one of the first servo case and the second servo case is provided. Is supplied to an oil passage facing in the axial direction provided inside the first input shaft and the intermediate shaft so as to communicate with those oil passages, and the lubricating oil is supplied from an opening end of the oil passage. The plurality of shift clutches and Lubrication structure in the transmission, characterized in that the various members in Yakesu was to lubricate.

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