JPS6021891B2 - front wheel drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a front wheel drive device for wheels of a tractor or the like.

In front wheel drive devices for four-wheel drive vehicles such as tractors,
A bevel gear mechanism is provided at both ends of the front axle case to move the defyoke shaft and king pin, and the front axle case, which supports the front wheel and has a built-in deceleration bevel gear mechanism, is rotatably attached to this bevel gear case. are doing.

However, in the past, the cylindrical part of the front axle case and the bevel gear case were separated, the bevel gear mechanism was installed from the closed part on the divided part side, and the bevel gear case and the cylindrical part were connected by bolts in the center direction. Since the bolts are fastened together by screws, a large load is applied to the bolts, resulting in breakage, loosening, etc. Furthermore, since the front axle case side and the bevel gear case are machined separately and then integrally joined during assembly, misalignment is likely to occur, making it difficult to ensure accuracy. The purpose of the present invention is to solve these conventional problems, and its feature is that a bevel gear is provided at both ends of the front axle case to interlock the defyoke shaft and the king pin. In a front wheel drive system, a bevel gear case with a built-in mechanism is provided, and a front wheel case supporting the front wheels is provided in the bevel gear case so as to be rotatable around a king pin. and a diagonal opening for inserting the bevel gear of the bevel gear mechanism in the upper part of the bevel gear case on the side opposite to the front axle case so as to face the defoke shaft and the king pin and close diagonally upward. At the same time, a case lid is provided which also serves as a support for the front wheel case so as to close the front wheel case. Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments. In FIGS. 1 and 2, reference numeral 1 denotes a tractor body, and the structure includes an engine 2, a transmission case 3, etc. Front axle frame 4 to protrude
is installed.

Reference numeral 5 designates a front axle case, which includes a differential storage portion 7 that accommodates the differential device 6, a pair of left and right cylindrical portions 9 surrounding each of the differential fork shafts 8 of the differential device 6, and an exterior shape of the cylindrical portions 9. The front axle case 5 is integrally formed with a bevel gear case 11 that houses a bell gear mechanism 10 by casting or the like, and this front axle case 5 has a support shaft 12 and a differential holding shaft arranged on the same center in front and behind the differential housing part 7. The body 13 is supported on the front vehicle scale frame 4 by a pair of front and rear bearing stands 14 and 15.

The differential housing part 7 of the front axle case 5 is formed to have a larger diameter than the cylindrical part 9, as shown in FIGS. 3 and 4, and the differential housing part 7 has a circular shape that opens rearward. A gateway section 16 is provided.

The differential holding body 13 includes a lid part 17 that closes the closing part 16, a boss part 18 that projects rearward from the rear center part of the lid part 17,
It is formed integrally with a pair of left and right bearing arms 19 that protrude into the differential housing part 7 from the lid part 17, and can be detachably attached to the differential housing part 7 by a plurality of bolts 20 in the circumferential direction through the lid part 17. It will be worn. A bevel pinion shaft 2 is attached to the boss portion 18.
1 is rotatably inserted and supported via bearings 22 and 23, and its bevel pinion shaft 21 is connected to a power take-off device attached to the lower abdomen of the mission case 3 via a propulsion shaft in a propulsion shaft cover 24. 25. The differential device 6 has a bevel gear 27 that fits into a bevel pinion 26 of a bevel pinion shaft 21, and a pair of left and right ball bearings 28.
It is rotatably supported by a bearing arm 19 via.
The bevel gear mechanism 101 consists of a bevel gear 29 provided at the outer end of the differential fork shaft 8, as shown in FIG. 5, and a bevel gear 31 provided with a king pin 30' for engagement with the bevel gear 29. Become.

The bevel gear 29 is mounted on a spline shaft portion formed at the outer end of the defogger shaft 8, and is rotatably held by the bevel gear case 11 via a pawl bearing 32. The bevel gear 31 is spline-coupled to the upper end of the king pin 30 and is rotatably held by the bevel gear case 11 via roller bearings 33. As shown in FIGS. 5 to 7, the bevel gear case 11 is formed with a forehead diagonal opening 34 that opens diagonally outward and upward facing the various parts of the differential fork shaft 8 and the king pin 30. The mirror slanted mounting surface 35 around the slanted closing portion 34 is closed.
The case lid 36 is detachably attached by a plurality of bolts 37. The neck diagonal opening □ part 34 is large enough to roughly attach the bevel gears 29, 31 to the defyoke shaft 8 and king pin 30, and the front and rear mounting seats 38 are located between the bevel gears 29, 31 and It is formed to protrude to the side. The bevel gear case 11 has sleeve parts 39 and 40 at the lower end and the case lid 36 at the upper end, respectively, and the cylinder shaft parts 39 and 40 are formed on the same axis with respect to the king pin 30. , from each barrel portion 39, 40',
A front wheel case 42 supporting a front wheel 41 is pivotally mounted around the king pin 30 so as to be freely rotatable. The front wheel case 42 has a substantially L-shape when viewed from the rear, integrally comprising a lower case 43 and a side case 44, and houses a reduction bevel gear mechanism 47 comprising a bevel pinion 45 and a bevel gear 46.

The lower case 43 is the cylindrical shaft portion 39 of the bevel gear case 11.
It has a mantle saddle part 48 that is rotatably mounted on the sleeve, and a step part 49 located below the saddle part 48, and a thrust ball bearing 50 is interposed between the cylinder shaft part 39 and the step part 49. Also lower case 4
A bevel pinion 45 is rotatably supported at the lower end of the king pin 30 via a pawl bearing 51, and this bevel pinion 45 is spline-coupled to the lower end of the king pin 30. The side case 44 has a sekiguchi and a bevel gear 46 laterally outward.
It has a large-diameter closed portion 52 for insertion and removal, and is integrally formed with an axle 64 that protrudes outward from the inner wall 53. The bell gear 46 is rotated freely. Note that the axle 54 is formed in a hollow shape to reduce weight.

The front wheel 41 includes a wheel disc 57, which is detachably attached to the outer end surface of the bevel gear 46 by a plurality of bolts 58. 59 is an oil seal, and 6 is a blind cover.

A steering arm 62 is attached to the upper end of the side case 44 of the front wheel case 42 with a bolt 61. The steering arm 62 has a bottomed drum part 63 in the middle part that opens downward.
The bracing portion 63 is the cylinder shaft portion 40 that protrudes from the case diamond 36.
'He can freely rotate around. Note that the steering arm 62 is operatively connected to a handle 64. 64 is the rear wheel.

Next, the operation of the above configuration will be explained.

During running, the power extracted from the power extraction device 25 is
Propulsion shaft, bevel pinion shaft 21, bevel pinion 26,
It is transmitted to the differential gear 6 via the bevel gear 27. Then, the differential device 6 operates according to the load on each front wheel 41, and the bevel gear 29 and bevel gear 3 are connected to the differential gear 6 from the differential fork shaft 8.
1. It is transmitted to the bevel gear 46 via the king pin 30 and the bevel pinion 45, and the axle 5 of this bevel gear 46
The front wheels 41 are driven by four rotations. Of course, at this time, the rear wheels 64 are also being driven, and the tractor travels in four-wheel drive. However, in the above-mentioned Yokosei, the bevel gear case 11 is provided with the oblique closing part 34, so when assembling, the deferoke is inserted from this inclined closing part 34 through the cylindrical part 9 to the differential device 6 of the differential housing part 7. Koji 8 can be inserted, therefore,
The differential accommodating portion 7, the cylindrical portion 9, and the bevel gear case 11 of the front axle case 5 can be integrated by casting or the like as shown, and the strength is significantly improved.

Furthermore, since the opening 34 is oblique, a sufficient opening area can be secured, and the bevel gears 29 and 31 can be easily assembled.
The forehead diagonal opening part 34 is closed with a case lid 36 bolted to the mirror diagonal mounting surface 35, but since it is the forehead diagonal mounting surface 35, even if a sufficient area of the mounting surface is secured, the mounting part itself cannot be closed. There is no need for a flange-like extension along the surrounding green part, and in particular, the front and rear mounting seats 38 are located on the bevel gears 29, 31 and provided on the inside, so the front wheel 41 can be rotated around the king pin 30. Even when the front wheel case 42 is tilted, the front wheel case 42 can be prevented from interfering with the side case 44, and the turning angle of the front wheel 41 can be increased. Furthermore, no heavy load is applied to the bolt 37 itself, and there is no chance of loosening or breaking. When assembling the bevel gear 46 into the front wheel case 42, the ball bearing 5 is attached to the axle 54.
5 and 56, an oil seal 59 is attached to the entrance part 52 of the leg case 44,
Just attach a protective ring.

In the present invention, since the front axle case and the bevel gear case are integrally formed, there is no possibility of bolt breakage or loosening, and the strength is significantly improved, compared to the conventional case where they are bolted together as separate bodies. It is easy to ensure machining accuracy.

In addition, the bevel gear case is provided with a diagonal opening that opens diagonally upwards, facing the differential fork shaft and king pin, on the upper part of the opposite side of the front axle case, and the bevel gear of the bevel gear mechanism is inserted through this closed opening. Therefore, even though the front axle case and the bevel gear case are integrated, they can be easily assembled. Moreover, since the opening has an inclined shape that opens diagonally upward □, the size of the slanted opening □ relative to the bevel gear case can be made larger compared to an opening □ that opens on the top surface. Bevel gear can be easily incorporated. In addition, since the oblique opening closes diagonally outward and upward, even when attaching the case lid to this, the attachment portion does not protrude outward, and the turning angle of the front wheel becomes large. Furthermore, the case lid also serves as a support for the front wheel case, but since the opening part is mirror-slanted and the area can be increased, the number of mounting bolts used to attach the case lid to the bevel gear case can be increased. , so a large load is not applied to a single bolt,
Breakage, loosening, etc. can be prevented.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, the first being a side view and the second being a side view.
The figure is a rear view of the front wheel support section, FIG. 3 is a partially cutaway side view, FIG. 4 is a view along the W-W arrow in FIG. 3, FIG. 5 is a sectional view of the front wheel drive section, and FIG. FIG. 7 is a partially cutaway plan view of the obliquely closed portion, and FIG. 7 is a partially cutaway rear view of the front wheel drive portion. 1...Tractor body, 5...Front axle case, 8...Def fork ball, 10...Bevel gear mechanism, 11...Bevel gear case ,
34...Forehead diagonal opening, 36...Case lid, 41...Front wheel, 42...Front wheel case,
47...Deceleration bevel gear mechanism. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7

Claims (1)

[Claims] 1. A bevel gear case 11 incorporating a bevel gear mechanism 10 that interlocks the differential yoke shaft 8 and the king pin 30 is provided at both ends of the front axle case 5, and a front wheel case 42 that supports the front wheels 41 is attached to the bevel gear case 11 by the king pin. 30, the front axle case 5 and the bevel gear case 11 are integrally formed, and the bevel gear mechanism 10 is mounted on the upper part of the bevel gear case 11 on the side opposite to the front axle case 5. An inclined opening 34 for inserting the bevel gears 29 and 31 is provided to open obliquely upward facing the differential yoke shaft 8 and the king pin 30, and is also used for supporting the front wheel case 42 so as to close the inclined opening 34. A front wheel drive device characterized in that a case lid 36 is provided.