JPH0317086Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a differential spherical washer detent device.

A differential is a differential gear device for absorbing the difference in rotational speed between the left and right wheels on the drive shaft of a wheeled vehicle, and its general structure is shown in FIG.

In Figure 1, 1 is the differential case (LH), 2
is the differential case (RH), 3 is the spherical washer, 4 is the spider, 5 is the differential pinion, 6 is the differential bevel gear, 7 and 8 are the axle shafts, and 9 is the differential bevel thrust washer.

In the conventional differential mechanism, as shown in FIG.
It was possible to rotate freely around the axis of Spider 4. Therefore, there is a problem that the sliding surfaces of the differential cases 1 and 2 are worn out due to the rotation of the spherical footshield 3. In order to solve this problem, as shown in Fig. 1, a dowel pin 10 is driven into the differential case 1 or 2, and the spherical washer 3 with a drilled hole is fixed to the differential case 1, 2. A detent mechanism is used to prevent relative rotation. This method has disadvantages in that it is difficult to form dowel pin holes in the differential case 1, and assembly is also difficult.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks and to provide an inexpensive and simple spherical washer rotation stopper for a differential that does not use a dowel pin.

The present invention is a differential for a wheeled vehicle that has a spherical washer between a differential case and a differential pinion.The spherical washer is formed on the periphery of the spherical part of the differential case that comes into contact with it, and can be continuously machined with the spherical part. In addition to providing a shoulder portion, the spherical washer is provided with an end surface portion that can be engaged with the shoulder portion, and is assembled with the shoulder portion and the end surface portion engaged to prevent relative rotation between the spherical washer and the differential case. The end of the spherically processed part of the differential case is stepped to convex in the direction of the center axis, and becomes the contact surface of the stopper of the spherical washer.
1 on the outer periphery of the spherical washer for the differential
Chamfers or protrusions are provided at one or more locations to act as a stopper to prevent rotation, so that the surface provided on the spherical washer and the stepped portion provided on the differential case engage, thereby preventing relative rotational movement between the spherical washer and the differential case. This prevents dowel pins, etc.
Since no anti-rotation parts are used, the number of parts is minimized. In addition, the stepped processing for the rotation stopper can be processed in the same process as the processing of the spherical part, and there is no need for a difficult separate process such as drilling the dowel pin holes, and compared to the processing of conventional differential cases without rotation stops.
Since the number of processing steps does not increase, it is much cheaper than using dowel pins.

The present invention is applicable not only to wheeled construction machinery vehicles with differentials such as motor graders and wheel loaders, but also to wheeled vehicles such as automobiles and trucks.

Embodiments of the present invention will be described in detail below with reference to the drawings.

2 to 4 show an embodiment of the present invention,
Figure 2 is a cross-sectional view of a part of the differential gear system (differential), and Figure 3 is the differential case (LH).
FIG. 4 is a front view of the spherical washer.

5 to 7 are front views showing other specific examples of the spherical washer.

In the figure, 11 is the differential case (LH), 12
is differential case (RH), 13 is spherical washer, 1
4 is a spider, and 15 is a differential pinion. The above members are the same as the conventional members. In the differential case 11, 11a is a contact surface with the spherical washer 13, and 11b is a shoulder portion that is connected to the contact surface 11a and protrudes toward the center. The shoulder portion 11b may be processed to be stepped over the entire circumference, but only the portion in contact with the spherical washer 13 may be stepped.

As shown in FIG. 4, the spherical washer 13 is chamfered to form a notch (chamfered part) 13b, and when the spherical washer 13 is rotated around the axis of the spider 14, it touches the shoulder 11b attached to the differential case 11. The notch 13b of the spherical washer 13 abuts to prevent the spherical washer 13 from rotating.

In this apparatus configured in this manner, the differential pinion 15 freely rotates on the spherical washer 13 around the spider shaft 14. Due to the sliding resistance force of the differential pinion 15, rotational force acts on the spherical washer 13 and it tries to rotate, but the shoulder 11b provided on the differential case 11 and the spherical washer 13
It engages with the chamfered portion 13b, and does not rotate relative to the differential cases 11, 12 except for the play caused by the engagement.

According to this embodiment, even when the pinion 15 rotates, the spherical washer 13 does not rotate on the differential cases 11, 12, so the contact surfaces between the differential cases 11, 12 and the spherical washer 13 do not wear out. In addition, it is sufficient to perform rotation prevention processing on the differential case and spherical washers to prevent rotation, and there is no need for extra parts such as dowel pins to prevent rotation. Moreover, the step processing on the spherical part of the differential case can be easily done in the same process as the spherical surface processing, and there is no need for difficult separate processing such as drilling the dowel pin holes.
Attaching the spherical washer or chamfering can be done at the same time as pressing this product.

In the above embodiment, the chamfered portion was formed on the spherical washer, but as shown in FIG.
Alternatively, the shape of the contact surface of the spherical washer with the shoulder of the differential case is the contact surface 3 as shown in Figure 7.
4b may be made larger, or only the protrusion 33b provided on the outer periphery may be used as the contact portion, as shown in FIG.

Also, in Figure 2, the stepped processing is for the differential case (LH).
11 is shown, but the stepped processing is applied to differential case (LH) 11 and differential case (R.
It goes without saying that the same function can be achieved even if it is applied to both sides of H) 12.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing a conventional differential, Fig. 2 is a sectional view of main parts showing an embodiment of the present invention,
Figure 3 is a sectional view of the main parts of the differential case used in this example, Figure 4 is a front view of the spherical washer used in this example, and Figures 5 to 7 show other examples of this spherical washer. FIG. 11... Differential case (LH), 12... Differential case (RH), 13... Spherical washers, 14...
Spider, 15... differential pinion, 11a... contact surface, 11b... shoulder portion, 13b... chamfered portion.

Claims (1)

[Scope of utility model registration request] In a differential for a wheeled vehicle having a spherical washer between a differential case and a differential pinion, a shoulder is formed on the periphery of a spherical part of the differential case that the spherical washer comes into contact with, and is capable of continuous machining with the spherical part. In addition, the spherical washer is provided with an end surface that can be engaged with the shoulder, and relative rotation between the spherical washer and the differential case is prevented by assembling with the shoulder and the end surface engaged. Features a differential spherical washer anti-rotation device.