JPS5894634A - Seal covering device of universal joint - Google Patents

Abstract

PURPOSE:To obtain a positive sealing effect by constituting the titled device so that circular peripheral edges of a pair of bowl-shaped covers rotate while constantly coupling together to prevent the external part of the circular peripheral edges from being exposed and also from being exposed to muddy water or the like. CONSTITUTION:Upon steering operation, bowl-shaped covers 18 and 21 rotate in the opposite directions around the axial cores of a driving shaft 10 and a driven shaft 12, and circular peripheral edges 17 and 20 rotate in opposite directions in a state where they are fitted. By this operation, the arm 15, the driven shaft 11 and the bowl-shaped cover 21 are bent around the core of a king pin 16, and thus the steering is carried out. Upon the occasion, the circular peripheral edges 17 and 20 of the bowl-shaped covers 18 and 21 are constantly coupled to the seal ring 23. Therefore, even when the steering operation is carried out in any direction, it is prevented that the circular peripheral edge 5 are exposed to the external part and also exposed to muddy water or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a seal cover device for a universal joint.

Conventionally, in four-wheel drive vehicles, universal joints have been used to steer the front wheels while transmitting rotational force to the front wheels. Universal joints are covered with a cover to protect them from muddy water and sand, as well as to retain lubricating oil and prevent oil leakage.One way to do this is to bend the joint part with rubber bellows, which has a simple structure. However, because rubber lacks strength and durability, it is unsuitable for agricultural tractors used in wet fields. Therefore, as a conventional device for covering the universal joint of an agricultural tractor, there is a device shown in FIG. 1. That is, the engine (
A hemispherical bowl-shaped portion (3) is integrally formed at the outer end of a drive shaft case (2) that rotatably stores and holds a drive shaft (1) connected to a drive shaft (not shown) around its axis; A hemispherical bowl-shaped portion (6) is also integrated at the inner end of the driven shaft case (5) that houses and holds the driven shaft (4) to which the front wheel (not shown) is connected rotatably around its axis. formed, one bowl-shaped part (6) is superposed on the other bowl-shaped part (3), and these bowl-shaped parts (
3) (6) The members are rotatably supported by a kingpin (not shown). Further, the outer end of the drive shaft (1) and the inner end of the driven shaft (4) form the bowl-shaped portion (3).
(6) and connected by a universal joint (7). A seal member (8) that slides in close contact with the outer peripheral surface of the bowl-shaped portion (3) is fixed to the peripheral edge of the bowl-shaped portion (6). In such a configuration, when performing a steering operation, the driven shaft case (5) and the bowl-shaped portion (6) rotate around the axis of the kingpin, and the universal joint (7) also rotates on the kingpin's axis. The sealing member (8) is bent into a bowl-shaped portion (
3) Slides while being in close contact with the outer peripheral surface. In this way, the universal joint (7) is protected from muddy water and sand and dust, and lubricant oil leakage from inside the bowl-shaped parts (3) and (6) is prevented.
There is a part of the outer peripheral surface of the bowl-shaped part (3) that the seal member (8) is in close contact with that is exposed to the outside and exposed to muddy water, etc., and during steering, the seal member slides on the outer peripheral surface covered with muddy water. Due to this movement, the durability of the seal member (8) is impaired. Furthermore, precision is required for the spherical finish of the outer circumferential surface of the bowl-shaped portion (3), and chrome plating, etc., is required, which increases the cost. Also, when the steering angle is increased during steering, the seal member (8) joins to the drive shaft case (2), or the peripheral edge of the bowl-shaped part (3) joins to the driven shaft (4), so that the steering angle increases. The direction angle is restricted and the steering angle cannot be increased.

The present invention was created in view of these points, and maintains a reliable sealing effect even under harsh usage conditions such as wet rice fields.
The object of the present invention is to obtain a seal cover device for a hinge universal joint that allows a large steering angle and improves the durability of the seal member.

The present invention connects a drive shaft stored and held in a drive shaft case and a driven shaft stored and held in a driven shaft case in a bendable manner using a universal joint, and connects the drive shaft case and the driven shaft case to the shaft of a kingpin. The circular periphery of the first bowl-shaped cover, which is bendably connected to the central rotation shaft and is held rotatably around the axis of the drive shaft while covering the universal joint at one end of the drive shaft case, and one end of the driven shaft case. The circular periphery of the second bowl-shaped cover, which is held behind the universal joint so as to be rotatable around the axis of the drive shaft, is tilted diagonally to the axis of the king pin and rotated around the bending center of the universal joint. By fitting freely and tightly, during steering operation, the first bowl-shaped cover rotates around the axis of the drive shaft, and the second bowl-shaped cover rotates around the axis of the driven shaft. It rotates in the opposite direction to the cover, and at the same time, the circular peripheries of each bowl-shaped cover rotate in the opposite direction while closely fitting each other, so that the circular peripheries that are tightly fitted to each other are exposed to the outside and exposed to muddy water, etc. A reliable sealing effect can be obtained without any problems.
In addition, since the circular edges that fit tightly together are flat, it is easy to manufacture the bowl-shaped cover, and the steering angle can be set large by eliminating restrictions on the operating angle of the universal joint due to the bowl-shaped cover. It's something.

A first embodiment of the present invention will be described based on FIGS. 2 to 5. Drive shaft cases (9) are connected to both left and right sides of a transmission case (not shown) that houses a differential gear device (not shown) to which power from an engine (not shown) is transmitted. A drive shaft α0 whose inner end is connected to the differential gear device is housed and held in these drive shaft cases (9) so as to be rotatable about the axis υ. A driven shaft (6) to which a front wheel (not shown) is connected to the outer end is housed and held in the driven shaft case α located on the outer end side of the drive shaft α0 so as to be rotatable about the shaft center. , the inner end of the driven shaft α and the drive shaft Q0
and the outer end thereof are refractably connected via a universal joint (2). An arm α→ is fixed to the outer periphery of the outer end of the drive shaft case (9), and an arm α is fixed to the outer periphery of the inner end of the driven shaft case α, and these arms α4
The tips at α are rotatably connected by a pair of upper and lower king pins θ. The bending center of the universal joint (1→) is located on the axis of the king pin α. The outer end of the drive shaft case (9) has a bowl-shaped cover α having a circular periphery α″I. The mark is rotatably held around the axis of the drive shaft αQ via a bushing field that serves as both a bearing and a seal, and the inner end of the driven shaft case α■ has a circular periphery (E). A bowl-shaped cover Q■ is rotatably held around the axis of the driven shaft (6) via a bushing that also serves as a bearing and a seal.
The circular edge α7 covers the universal joint α7.
The two wires are rotatably fitted together through a seal ring (C), and the fitting surfaces of the two wires on the circular periphery a are inclined downwardly inward with respect to the axis of the kingpin αQ. Note that the center of rotation of the circular peripheral edge αnO coincides with the center of refraction of the universal joint 03. and the bowl-shaped cover oe
A C-shaped nup ring (c) which faces the circular edge α in the direction in which the two halves join together has both ends engaged with the depressions (c) on the outer circumferential surface of the bowl-shaped cover (c) and is removed. I can hear you. Note that the straight line connecting the depressions (c) passes through the center of the universal joint α.

In such a configuration, is the bowl-shaped cover marked ○ during steering operation? (2) rotates in opposite directions around the axes of the drive shaft (07) and driven shaft (6), respectively, and rotates in opposite directions with the circular peripheral edges (07) fitted together, thereby causing the arm ( 10
The driven shaft case <11) and the force of the bowl-shaped cover Q are refracted around the axis of the king pin αQ, thereby performing steering. At this time, the circular periphery α? of the bowl-shaped cover (18191)? ) is always connected to the seal ring (), so that the circular periphery αη (e) is not exposed to the outside and exposed to muddy water, etc. even when steering is performed in any direction, increasing the durability of the seal ring. As well as improving the sealing effect. In addition, since the circular peripheral edge α that joins with the seal ring (c) is flat, it is easy to manufacture the bowl-shaped cover CF mark a◇, and costs can be reduced. Furthermore, the bowl-shaped cover 〇Fj91) does not restrict the operating angle of the universal joint 01, and allows the steering angle to be determined largely.

Next, a second embodiment of the present invention will be explained based on FIG. 6. Note that the same parts as those explained in FIGS. 2 to 4 are designated by the same reference numerals, and explanations thereof will be omitted. Drive shaft α
0 and the driven shaft (6) are connected via a constant velocity ball joint (C) which is a universal joint, and the front axle (E) is connected to the driven shaft CI'4 via a reduction gear @ (C). A front wheel (G) is fixed to the outer end of the front axle. The portion of the outer peripheral surface of the bowl-shaped cover cta oe that covers the constant velocity ball joint (g) that faces the king pin αQ is the king pin α・
It is formed flat to avoid interference with the Also,
Since the bowl-shaped cover 〇 core 02 is attached so that it can rotate freely around the axis of the drive shaft α0 and the driven shaft (1 pin) and does not bear any load, the king pin 0 is worn and play occurs. The sealing effect will not deteriorate even if

As described above, the circular edges of the pair of bowl-shaped covers are not exposed to the outside and exposed to muddy water, etc., and a reliable sealing effect can be obtained, and the circular edges that fit tightly together are flat. Therefore, the bowl-shaped cover can be manufactured easily, and since the operating angle of the universal joint is not restricted, the steering angle can be set large.

[Brief explanation of the drawing]

Figure 1 shows a conventional example; a partially sectional plan view;
FIG. 2 shows a partially sectional front view of the first embodiment of the present invention, and FIG. 3 is an exploded perspective view of the bowl-shaped cover.
Figure 4 is a bottom view showing the connected state of the bowl-shaped cover, Figure 5
This figure is a bottom view of a state in which a steering operation has been performed from the state shown in FIG. 4, and FIG. 6 is a partially sectional front view showing a second embodiment of the present invention. 9... Drive shaft case, 10... Drive shaft, 11...
Driven shaft case, 12... Driven shaft, 13... Universal joint, 16... King pin, 17... Circular periphery, 18...
... Bowl-shaped cover, 20... Circular periphery, 21... Bowl-shaped cover, 26... Constant velocity pole joint (universal joint)
, 31-32... Bowl-shaped cover applicant Ishikawajima Shibaura Machinery Co., Ltd." Z diagram

Claims (1)

[Claims] A drive shaft that is housed and held in a drive shaft case and is rotatable around the axis 9 and a driven shaft that is housed and held in the driven shaft case and can be freely rotated around the axis 9 are refractably connected via a universal joint. The drive shaft case and the driven shaft case are connected so as to be bendable about the axis of a king pin, and a first bowl-shaped cover having a circular periphery is rotated about the axis of the drive shaft while covering the universal joint. A second bowl-shaped cover having a circular periphery is held at one end of the driven shaft case so as to be freely rotatable about the axis of the driven shaft while covering the universal joint. , a universal joint characterized in that the circular peripheral edges of the first and second bowl-shaped covers are tilted obliquely with respect to the axis of the king pin and are tightly fitted so as to be rotatable about the bending center of the universal joint. Seal cover device.