JP3840665B2 - Counter gear shaft mounting device for tractor - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a shaft mounting device for mounting a counter gear in a gear transmission such as a tractor, a combiner, or a seedling transplanter.
[0002]
[Background Art and Problems to be Solved by the Invention]
In general, a counter gear is integrally formed with a pair of front and rear gear portions in the axial direction as a part of the gear transmission, but the counter gear diameter is reduced to reduce the length of the gear cylinder shaft. The transmission case is to be made small.
[0003]
[Means for Solving the Problems]
According to the present invention, a bearing fitting portion (4, 5) having a diameter larger than the inner diameter of the gear cylinder (3) is provided at both front and rear ends in a gear cylinder (3) having gears (1, 2) formed at both front and rear ends. ) Are formed, and the outer ring portions (10, 11) of the tapered bearings (8, 9) are fitted to each other, and both the tapered bearings (8, 9) and the inner ring portion ( 12 and 13), the support shaft (15) is inserted through the collar (14) interposed between them , and the diameter of the support shaft (15) is made different between the front and rear bearing cases (16, 17). The formed shaft holes (18, 19) are inserted from the rear end shaft hole ( 19 ) side having a larger diameter toward the front end shaft hole ( 18 ) side, and the front and rear end portions of the support shaft (15) are inserted. supported around the bearing case (16, 17), and the supporting the inner ring portion (12, 13) end faces of the tapered bearings (8,9) Axis (15) so as to be sandwiched between the jaws of the end portion (20) and an end face around the shaft hole (18) of the front side of the bearing casing (16) (21), the support shaft (15) front end The shaft of the counter gear in the tractor is configured such that the jaw portion (20) is drawn toward the front end bearing case (16) side by tightening and fixing the portion to the front end bearing case (16) with a fastener (22). The configuration of the equipment.
[0004]
[Operation and effect of the invention]
The gear cylinder (3) having the gears (1, 2) is pivotally supported by the taper bearings (8, 9) with respect to the support shaft (15) and is transmitted and rotated as a counter gear. Both ends of the support shaft (15) are fitted in the shaft holes (18, 19) of the bearing case (16, 17), and are fastened and fixed to the bearing case (16) at the front end by a fastener (22). By doing so, the jaw part (20) is pulled to the bearing case (16) side of the front end to be fastened and fixed by the inner ring part (12, 13) and the collar (14) of each tapered bearing (8, 9). Therefore, stable support transmission of the gear cylinder (3) can be performed. The tapered bearings (8, 9) are fitted to the bearing fitting portions (4, 5) formed on the inner periphery of the gear (1, 2) of the gear cylinder (3). Therefore, it is difficult to limit the diameter of the taper bearing diameter, and the inner ring portions (12, 13) are positioned between the front and rear bearing cases (16, 17). Therefore, the length of the gear cylinder (3) is shortened. Thus, the bearing configuration can be simplified.
[0005]
【Example】
The counter gear of the illustrated example illustrates a case where it is used as a tractor reverser. The tractor vehicle body is configured by connecting the clutch housing 23, the front / middle / rear transmission case 24, and the like from the front engine E to the rear side. A front axle housing 27 for mounting a pair of front wheels 26 is provided, a rear axle housing 29 for mounting a rear wheel 28 is provided on the left and right sides of the rear mission case 24, and a lift arm 30 is moved up and down. A hydraulic case 31 for accommodating a rotating hydraulic cylinder or the like is provided, and the front wheel 26 and the rear wheel 28 can be driven by the engine E to travel.
[0006]
32 is a cockpit provided on the floor between the left and right fenders 33, 34 is a main transmission lever, and 35 is an auxiliary transmission lever. Reference numeral 36 denotes a power take-out shaft. The clutch housing 23 has a double clutch configuration including a traveling clutch shaft 37 that is transmitted via the main clutch and a power take-off transmission shaft 38 that is directly driven from the engine E. The clutch housing 23 is provided from the transmission case 24 to the rear side of the traveling clutch shaft 37. A main transmission shaft 39 is provided in the transmission case 24 and the auxiliary transmission shaft 40 is provided on the rear side. Provided as a double shaft.
[0007]
The reverser 41 is provided between the front and rear bearing cases 16 and 17 at the rear of the clutch housing 23, and is synchronized between the rear end of the clutch shaft 37 and the front end of the main transmission shaft 39. By shifting the reverser clutch 42 in the axial direction, the rotation of the clutch shaft 37 can be switched to normal rotation or reverse rotation and transmitted to the main transmission shaft 39. The reverser clutch 42 is provided on a clutch shaft 37. A reverse gear 43 is rotatably provided on the front side, and a gear 44 integral with the main transmission shaft 39 is provided on the rear side. By engaging the reverser clutch 42 with the gears 45 and 46, it is possible to transmit to the reverse gear 43 (R) or to transmit to the gear 44 (F).
[0008]
The support shaft 15 and the gear cylinder 3 are provided so as to face the reverser clutch 42. The front gear 1 is engaged with the reverse gear 43 through an idle gear 47, and the rear end gear 2 is a gear 44. Mesh with. For this reason, when the reverser clutch 42 is shifted from the neutral position N to the reverse position R, the main transmission shaft 39 is reversely transmitted through the clutch shaft 37 → the reverse gear 43 → the idle gear 47 → the gear 1 → the gear 2 → the gear 44. Further, when the reverser clutch 42 is shifted from the neutral position N to the forward position F, it is transmitted directly from the clutch shaft 37 to the main transmission shaft 39.
[0009]
The support shaft 15 is formed with a jaw portion 20 having a large diameter at the rear end, and is rotatably fitted in a shaft hole 19 formed in the bearing case 17. The front end portion is rotatably inserted into the shaft hole 18 of the bearing case 16, protrudes to the front side of the bearing case 16, and a tightening tool 22 such as a nut is screwed to the screw portion. Tighten and fix. The gear cylinder 3 is formed with large-diameter bearing fitting portions 4 and 5 at portions facing the gears 1 and 2 at the front and rear end portions to fit the outer ring portions 10 and 11 of the taper bearings 8 and 9. It is possible to lock the axial position of the fitting with the inner steps 6 and 7. The taper bearings 8 and 9 are fitted to the gear cylinder 3 within the length range, and the end surfaces of the inner ring portions 12 and 13 are connected to the end surface 21 of the shaft hole 18 of the bearing case 16 and the support shaft 15. The rear end jaw portion 20 is brought into contact with the rear end jaw portion 20. A collar 14 is interposed between the inner rings 12 and 13 of the front and rear taper bearings 8 and 9.
[0010]
By rotating and tightening the fastening tool 22 from the front side of the bearing case 16, the jaw portion 20 is drawn toward the bearing case 16, and the inner ring portions 12, 13 and the collar 14 are brought into pressure contact with each other. The case 16 can be fixed. The main transmission 48 has synchro-type transmission clutches 49 and 50, transmission gears 51 to 54, etc. disposed on the main transmission shaft 39, and the gears 56 to 59 on the counter shaft 55 mesh with the transmission gears 51 to 54. Thus, the rotation of the main transmission shaft 39 can be transmitted to the transmission gear 54.
[0011]
The sub-transmission device is engaged with the gears 60, 61 on the sub-transmission shaft 40 and the gears 64, 65 on the bevel pinion gear shaft 63 that transmits the differential device 62 linked to the rear wheel 28. By shifting the intermediate transmission clutch 66 from the neutral position N to the gear 60 side, the auxiliary transmission shaft 40 is moved to the bevel pinion gear shaft 63 at a high speed H. Further, by shifting the shift clutch 66 from the neutral position N to the gear 61 side, a medium speed M is obtained.
[0012]
The low speed L of the sub-shift is between the gear 71 on the sub-transmission shaft 40, the gear 69 on the gear cylinder 68 having the gear 61, and the reverse gear 70 meshing with the gear 60. The switching gear 73 and the like are provided, and the switching gear 73 is engaged with the gear 69 from the neutral position N to obtain the low speed L. Further, the reverse gear R is obtained by meshing with the reverse gear 70.
[0013]
A sub-transmission gear 74 is provided between the main transmission gear 54 at the rear end of the main transmission shaft 39 and the sub-transmission shaft 40. When the sub-transmission gear 74 is shifted to the front side, the sub-transmission gear 54 is directly connected to the sub-transmission gear 54. The shaft 40 is interlocked, but when shifted to the rear side and meshed with the gear 76 on the shaft 75, the gear 78 meshed with the gear 77 at the rear end of the main transmission gear 54, the gear 76, the secondary transmission gear 74, etc. After that, the auxiliary transmission shaft 40 is interlocked.
[0014]
A front wheel transmission shaft 79 that transmits power to the front wheels 26 is provided at a lower portion of the mission case 23. The front wheel transmission shaft 79 is connected to a clutch shaft 82 that is mounted on a constant speed clutch 80 and a speed increasing clutch 81, and Since the front wheel transmission shaft 97 is not driven at the neutral position N, the two-wheel drive traveling is performed in which only the rear wheel 28 is driven. When the constant speed clutch 80 is engaged, the bevel pinion gear shaft 63 → the gear 65 → the clutch gear 83 → the constant speed. Through the clutch 80 → the clutch shaft 82 → the front wheel transmission shaft 79 →, the front wheel 26 is driven in four WDs at substantially the same speed as the rear wheel 28.
[0015]
When the speed increasing clutch 81 is turned on, the speed of the clutch gear 83 is increased between the gear 83 and the gear 84 on the speed increasing clutch 81 side. After this, the clutch shaft 82 is transmitted at an increased speed, so that the speed-up four-WD traveling is performed with the front wheel 26 rotating at a high speed with respect to the rear wheel 28. The power take-off transmission shaft 38 is switched from the neutral position N to the motor PTOM and the ground PTOG by a coupling clutch 89 between the transmission shaft 88 passing through the upper portion of the differential device 62. A rear end of the transmission shaft 88 is provided with a wet multi-plate type PTO clutch, and a transmission is provided to drive the power take-out shaft 36.
[0016]
The coupling clutch 89 includes a gear 91 that meshes with the gear 90 at the rear end of the gear cylinder 68, a gear 93 that meshes with the gear 92 at the rear end of the power transmission shaft 38, and a gear 94 at the front end of the transmission shaft 88. By forming the gear 95 and the like that are always meshed with each other and shifting the clutch 89 back and forth, the neutral position N where neither of the gears 91 and 93 mesh can be achieved. The gear 91 can be meshed with the gear 90 by shifting to the front side, and the transmission shaft 88 can be linked to the gear 61 side of the sub-shift to be the ground PTOG. Further, the gear 93 is engaged with the gear 92 by shifting to the rear side, so that the transmission shaft 88 can be switched to the motor PTOM that transmits directly from the power take-off transmission shaft 38. As a result, the configuration is simple, the size can be reduced without taking up space, and the configuration of a bearing wall or the like is also unnecessary.
[Brief description of the drawings]
[Fig. 1] Partial side view [Fig. 2] Side view [Fig. 3] Partial enlarged side view [Fig. 4] Side view [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Gear 2 Gear 3 Gear cylinder 4 Bearing fitting part 5 Bearing fitting part 6 Step part 7 Step part 8 Tape bearing 9 Tape bearing 10 Outer ring part 11 Outer ring part 12 Inner ring part 13 Inner ring part 14 Color
15 Support shaft 16 Bearing case 17 Bearing case 18 Shaft hole 19 Shaft hole 20 Jaw portion 21 End face 22 Fastening tool

Claims (1)

A stage having a bearing fitting portion (4, 5) having a diameter larger than the inner diameter of the gear cylinder (3) at both the front and rear ends in the gear cylinder (3) formed with gears (1, 2) at the front and rear ends. Parts (6, 7) are formed, and the outer ring portions (10, 11) of the taper bearings (8, 9) are fitted to each other, and both the taper bearings (8, 9) and the inner ring portions (12, 13) are fitted. A shaft formed by inserting the support shaft (15) over the collar (14) interposed between the support shaft (15) and the front and rear bearing cases (16, 17). The hole (18, 19) is inserted from the shaft hole ( 19 ) at the rear end having a large diameter toward the shaft hole ( 18 ) at the front end, and the front and rear end portions of the support shaft (15) are inserted into the front and rear bearing cases. supported on a (16, 17), and said support shaft (15) end of the inner ring portion (12, 13) end faces of the tapered bearings (8,9) Jaws parts (20) and so as to be sandwiched between the shaft hole of the front side of the bearing casing (16) (18) end face around (21), the support shaft (15) a front end portion of the fastener A counter gear shaft mounting device in a tractor configured to draw the jaw (20) toward the front end bearing case (16) side by tightening and fixing to the front end bearing case (16) in (22).

Images