JPH0567526U - Drive axle device - Google Patents

Abstract

(57) [Summary] [Structure] The first gear case 4 is fixed to the end of the axle case 3, and the king pin 7 to which power is transmitted from the differential yoke shaft 2 via the bevel gears 5 and 6 is fixed to the first gear case 4. A second gear case 8 supporting below the shaft 2 and supporting a lower portion of the king pin 7 is attached to the first gear case 4 so as to be rotatable around the king pin 7. First gear case 4
A bearing hole 13 concentric with the kingpin 7 is formed on the upper part of the bearing, a support body 14 is attached to the upper part of the second gear case 8, and a shaft portion 16 inserted into the bearing hole 13 via a bearing 15 is attached to the support body 14. The shaft portion 16 is provided so as to project downward.
Is arranged at a position where oil from the bevel gear 5 of the differential yoke shaft 2 is scattered. [Effects] The upper portion of the second gear case 8 can be rotatably supported on the upper portion of the first gear case 4 without causing the upper portions of the gear cases 4 and 8 to largely project upward, and the bearing 1
It is possible to reliably supply the lubricating oil to the shaft 5 and the shaft portion 16.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a drive axle device that is used, for example, for steering front wheels of a four-wheel drive tractor.

[0002]

[Prior Art]

 For example, in a front-wheel drive axle device for a small four-wheel drive tractor, a first gear case is fixed to an end of an axle case that surrounds the differential yoke shaft, and power is transmitted to the first gear case from the differential yoke shaft via a bevel gear. The king pin to be transmitted is supported below the differential yoke shaft, the second gear case that supports the lower part of the king pin is attached to the first gear case so as to be rotatable around the king pin, and the axle flange is fixed to this second gear case. The two gear cases and the axle flanges support the axle to which power is transmitted from the king pin through the bevel gear, and the upper portion of the second gear case is closed.

[0003]

[Problems to be solved by the device]

 In the above-mentioned prior art, the second gear case is supported only by the lower half of the first gear case, and the upper part is not supported, so the support strength is low. Therefore, it is required that the upper part of the second gear case is supported by the first gear case as in the case of a large one.

However, a large front-wheel drive axle device has a hole in the first gear case into which the kingpin is inserted from above, and the bearing and bevel gear above the kingpin are located above the differential yoke shaft and above it. Since a shaft member concentric with the king pin is provided on the upper side of the shaft member and a support body connected to the second gear case is fitted to the shaft member, the shape is such that the support member protrudes largely above the axle case. As the bevel gear above the kingpin interferes, it is difficult to lubricate the bearings, and it is also difficult to lubricate the shaft members.

According to the present invention, a bearing hole is formed in an upper part of the first gear case of the small-sized one, and a shaft portion protruding downward from a support body attached to the second gear case is inserted into the bearing hole. It is an object of the present invention to provide a drive axle device that can solve various problems.

[0006]

[Means for Solving the Problems]

 The concrete means for solving the problem in the present invention is to fix the first gear case 4 to the end of the axle case 3 surrounding the differential yoke shaft 2, and to the first gear case 4 from the differential yoke shaft 2 to the bevel gear 5. A king pin 7 to which power is transmitted via 6 is supported below the differential shaft 2, and a second gear case 8 supporting the lower part of the king pin 7 is attached to the first gear case 4 so as to be rotatable around the king pin 7. A drive axle device in which an axle flange 9 is fixed to a second gear case 8 and an axle 12 to which power is transmitted from the king pin 7 via the bevel gears 10 and 11 is supported by the second gear case 8 and the axle flange 9, A bearing hole 13 concentric with the king pin 7 is formed in the upper part of the first gear case 4, and a support body 14 is attached to the upper part of the second gear case 8. To via the bearing 15 is provided a shaft portion 16 which is inserted into the bearing hole 13 on the lower side protrude, it is that the oil of the shaft portion 16 from the bevel gear 5 of differential yoke shaft 2 is positioned so as to scatter.

[0007]

[Action]

 The middle part of the second gear case 8 is supported by the lower part of the first gear case 4 so as to be rotatable around the kingpin 7, and the upper part thereof is supported by the upper part of the first gear case 4 via the support body 14. The support body 14 has a shaft portion 16 projecting downward, is inserted through a bearing 15 into a bearing hole 13 formed in the upper portion of the first gear case 4, and protrudes too much upward from the first gear case 4. However, the bevel gear 5 of the differential yoke shaft 2 is located below the bearing 15, and the oil scattered by the rotation of the bevel gear 5 is applied to the shaft portion 16.

[0008]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. 1 and 2, reference numeral 1 denotes a drive axle device for front steering wheels of a small four-wheel drive tractor. The differential yoke shaft 2 to which power is transmitted from the engine is surrounded by an axle case 3 pivotally supported by a front axle frame via a center pin.

A first gear case 4 is fixed to an outer end portion of the axle case 3, and an upper portion of a king pin 7 is supported by the first gear case 4 via a bearing, and a bevel gear 5 extends from the differential yoke shaft 2 to the king pin 7. The power is transmitted via The king pin 7 is located below the differential yoke shaft 2, and the bevel gear 6 meshes with the lower side of the bevel gear 5.

The lower half of the first gear case 4 is formed in a cylindrical shape, and the second gear case 8 is attached rotatably around the king pin 7 via two bearings. A bevel gear 10 is attached to the lower portion of the king pin 7, and the lower portion of the king pin 7 is supported by the second gear case 8 via the bevel gear 10 and a bearing. An axle flange 9 is fixed to the second gear case 8, and the axle 12 is supported by the second gear case 8 and the axle flange 9 via a bearing. A bevel gear 11 that meshes with the bevel gear 10 is provided on the axle 12, and power is transmitted from the kingpin 7. Further, front wheels 18 are attached to the axle 12.

The upper portion of the first gear case 4 has conventionally been closed, but here, a cylindrical rising portion 19 is formed, and a bearing hole 13 concentric with the kingpin 7 is formed on the inner periphery thereof. On the other hand, a support body 14 is attached to the upper part of the second gear case 8 via bolts 20, and a shaft portion 16 is provided on the support body 14 so as to project downward.

The shaft portion 16 is inserted into the bearing hole 13 via a bearing 15 such as a bush or a needle bearing. Since the bevel gear 6 is below the bevel gear 5, the bearing 15 and the shaft portion 16 are arranged close to and above the bevel gear 5, and the lubricating oil scattered from the bevel gear 5 can be supplied to the grease nipple. No special lubrication oil supply means such as. Reference numeral 21 denotes a seal member provided on the inner circumference of the upper portion of the rising portion 19.

FIG. 3 shows a structure of a sheet metal axle case 3 applicable to the drive axle device, and the axle case 3 is divided into four in the axial direction. The central first case 30 that houses the diff device 29 is formed into a tubular shape by welding the front and rear halves, and front and rear center pin cylinders 31 and 32 are provided in front of and behind the rear center pin. A bevel pin-on shaft 33 is inserted through the cylinder 32.

Enlarged diameter fitting portions 34A and 34B are formed at both ends of the first case 30, and a second case 35 having a larger diameter is externally fitted and fixed to one fitting portion 34A. A third case 36 and a fourth case 37 are internally fitted and fixed to the outer end of the second case 35 and the other fitting portion 34B. The third case 36 and the fourth case 37 are formed to have the same diameter, and these and the second case 35 are formed of a tubular material.

As shown in FIG. 5, the conventional axle case 40 is divided into three parts in the axial direction, the second case 35 is not provided, and the inner end of the third case 36 is directly connected to the first case 30. Has been done. The distance from the outer end of the third case 36 to the first case 30 is longer than the distance from the outer end of the fourth case 37 to the first case 30, and in the conventional axle case 40, the third case of the first case 30. Since the end portion on the side of 36 is subjected to a larger stress than the end portion on the side of the fourth case 37, there is a problem in durability of the end portion. This problem can be solved by forming the first case 30 long so that the distance from the center pin to the left and right ends is the same, but the first case 30 is processed by using a large press die. Therefore, it is not preferable to change the design of the press die because it causes an increase in cost.

Therefore, as shown in FIG. 3, by making the third case 36 short and providing the second case 35 which can be formed of an inexpensive large-diameter cylindrical material, the same large stress acts. However, since the inner end of the second case 35 is formed to have a large diameter, it is possible to have a strength that can sufficiently withstand the stress. Moreover, the first case 30 can be used as it is.

[0017]

[Effect of the device]

 According to the present invention described in detail above, the bearing hole 13 concentric with the king pin 7 is formed in the upper portion of the first gear case 4, the support body 14 is attached to the upper portion of the second gear case 8, and the bearing 15 is attached to the support body 14. Since the shaft portion 16 inserted into the bearing hole 13 through the above is provided so as to project downward, and the shaft portion 16 is arranged at a position where the oil from the bevel gear 5 of the differential yoke shaft 2 is scattered, the first gear case 4 Also, the upper portion of the second gear case 8 can be rotatably supported on the upper portion of the first gear case 4 without causing the upper portion of the second gear case 8 to largely project upward, and the lubricating oil for the bearing 15 and the shaft portion 16 can be further supported. The supply can be performed reliably.

[Brief description of drawings]

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

FIG. 2 is a view on arrow X in FIG.

FIG. 3 is a cross-sectional plan view showing an example of an axle case.

FIG. 4 is a sectional view taken along line YY of FIG.

FIG. 5 is a cross-sectional plan view showing an example of an axle case.

[Explanation of symbols]

 1 Drive Axle Device 2 Diff Yoke Shaft 3 Axle Case 4 First Gear Case 5 Bevel Gear 6 Bevel Gear 7 King Pin 8 Second Gear Case 9 Axle Flange 10 Bevel Gear 11 Bevel Gear 12 Axle 13 Bearing Hole 14 Support Body 15 Bearing 16 Shaft Part

Claims (1)

[Scope of utility model registration request] 1. A first gear case (4) is fixed to an end of an axle case (3) surrounding the differential yoke shaft (2), and the bevel gear (5) extends from the differential yoke shaft (2) to the first gear case (4). The king pin (7), to which power is transmitted via (6), is supported below the differential yoke shaft (2), and the first gear case (4) includes the second gear case (8) that supports the lower part of the king pin (7). It is attached so as to be rotatable around the king pin (7), the axle flange (9) is fixed to this second gear case (8), and the bevel gear (from the king pin (7) to the bevel gear (8) 1
0) A drive axle device supporting an axle (12) to which power is transmitted via (11), wherein a bearing hole (13) concentric with the kingpin (7) is formed in the upper part of the first gear case (4). , 2nd gear case (8)
A support body (14) is attached to the upper part of the support body, and the bearing hole (13) is attached to the support body (14) through a bearing (15).
A drive axle having a shaft portion (16) inserted in the lower part provided in a downward protruding shape, and the shaft portion (16) is arranged at a position where oil from the bevel gear (5) of the differential yoke shaft (2) is scattered. apparatus.