JP2515170Y2 - Center bearing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> This invention is, for example, a center that rotatably supports a drive force transmission shaft provided in the middle of a drive shaft of a four-wheel steering vehicle or a truck. Regarding bearings.

<Prior Art> Generally, in a vehicle such as a truck where the distance from the front wheel to the rear wheel is long, a drive shaft is installed in order to prevent an adverse effect such as an increase in vibration when a single drive shaft is adopted. It is provided in two parts. In such a divided drive shaft, a shaft provided in the middle of the drive shaft is rotatably supported by a center bearing to transmit a driving force.

Conventionally, the center bearing is attached to the frame via an elastic body such as a cushion rubber, and an exhaust pipe as a heating element, for example, is installed in parallel with the shaft near the center bearing. And
In order to protect the center bearing by the heat from the heating element, between the heating element and the center bearing,
The heat shield plate was disposed while being fixed to the frame.

<Problems to be solved by the invention> However, in the above-mentioned center bearing, a heat shield plate must be specially provided, and the number of parts increases, and an extra man-hour for assembling the heat shield plate is required. Therefore, there is a problem that the cost becomes high.

This invention has been made in view of the above problems,
An object of the present invention is to provide a center bearing capable of shielding radiant heat from a heating element by making some improvements to conventional center bearing parts without increasing the number of parts and the number of assembly steps.

<Means for Solving the Problems> A center bearing according to the present invention for achieving the above object is a center bearing that is arranged near a heating element and rotatably supports a shaft that transmits a driving force. It has an outer ring fixed to the housing and a pair of dust covers fixed to both ends of the outer ring, and at least one of the dust covers has a radiant heat receiving portion for receiving heat rays emitted from the heating element on the outer periphery of the outer ring. It is characterized in that a heat shield portion that surrounds and shields radiant heat from the heating element is formed.

<Operation> According to the center bearing having the above structure, since the heat shield is formed on at least one of the pair of dust covers provided on both end sides of the outer ring, the dust cover also serves as a conventional heat shield plate. can do. Therefore, it is not necessary to provide a heat shield plate between the heating element and the center bearing.

<Examples> Detailed description will be given below with reference to the accompanying drawings showing examples.

FIG. 1 is a sectional view showing an embodiment of a center bearing A according to the present invention. In FIG. 1, the center bearing A is provided in the middle of a pair of drive shafts (not shown), The large diameter portion 10 at the center of the transmission connecting shaft 1 is rotatably supported.

The connecting shaft 1 has splines 11 and 12 respectively formed on both sides of the large-diameter portion 10 and connected to the drive shaft.

The center bearing A is the large diameter part of the connecting shaft 1.
An inner ring 2 fitted to the inner ring 10, an outer ring 3 fixed to a housing 7 via an elastic body 6 such as rubber, a ball 4 rotatably provided between the inner ring 2 and the outer ring 3, A cage 40 that holds the balls 4 at a predetermined interval, and a pair of dust covers that are provided on both ends of the outer ring 3 to prevent foreign matter from entering.
It has 5,50 and.

The housing 7 is a frame of a vehicle (not shown)
It is fixed to.

Circumferential grooves 13a are formed on both sides of the inner diameter 2 of the large-diameter portion 10, and retaining rings 13 for preventing the inner race 2 from shifting to the left and right are attached to the peripheral grooves 13a. . Further, on the outer side of the retaining ring 13, a pair of rubber or plastic oil seals 14 having a lip portion 14a slidably contacting the large diameter portion 10 are fixed to the inner peripheral surface of the outer ring 3,
A space between the outer ring 3 including the ball 4 and the large-diameter portion 10 is sealed by the oil seal 14 so that a lubricant such as grease can be contained therein.

One of the dust covers 5 is a dust cover
The outer ring 3 is integrally rotatably attached to the connecting shaft 1 in a state where the outer periphery of the outer ring 3 is surrounded. In addition, the dust cover 50 on the other side is rotatable relative to the connecting shaft 1 so that the outer ring 3 can rotate.
It is fitted and fixed on the inner peripheral side of. Further, on the outer side of the dust cover 50, a heat shield portion that surrounds the outer ring 3 over a predetermined range to shield radiant heat from a heating element (not shown).
51 is integrally formed.

FIG. 2 is a side view showing the heat shield portion 51. The heat shield portion 51 covers heat rays emitted from a heating element, which is the entire one end face side of the outer ring 3 and a substantially half circumference on the outer peripheral side of the outer ring 3. It is provided in a state of surrounding the received radiant heat and the heat receiving portion B. It should be noted that the dust cover 50 and the heat shield 51 are provided with holes 52 for drain discharge.

According to this embodiment, the radiant heat receiving portion B on the outer periphery of the outer ring 3 is surrounded by the heat shield 51 integrally formed on the outer side of the dust cover 50, and the dust cover 50 is also provided.
Since 50 is fixedly fixed to the outer ring 3, it is possible to shield the radiant heat from the heating element and protect the center bearing A.

Also, since the dust cover 50 also serves as the conventional heat shield plate, it is only necessary to make some modifications to the conventional dust cover, and the heat that was previously installed between the center bearing and the heat generating element The shield plate is not required, the number of parts can be reduced, and the number of steps for assembling the heat shield plate to the frame can be omitted.

Furthermore, the heat shield 51 is integrated with the dust cover 50 fixed to the outer ring 3, does not follow the rotation of the connecting shaft 1, and only needs to cover the minimum necessary range. Compared with the heat shield plate that is conventionally fixed to the frame, the shield area for radiant heat is smaller, so that the heat shield plate can be downsized.

In this embodiment, the heat shield 51 is formed only on one side 50 of the dust cover, but the present invention is not limited to this, and the dust covers 5 on both ends of the outer ring 3 are not limited thereto. The heat shield 51 may be formed on the terminals 50 and 50. In addition, various design changes can be made without changing the gist of the present invention.

<Effects of the Invention> As described above, according to the center bearing of the present invention, the heat shield formed integrally with the dust cover enables
Since the radiant heat from the heating element can be shielded, the heat shielding plate conventionally installed between the center bearing and the heating element becomes unnecessary. Therefore, it is possible to reduce the number of parts, and it is possible to omit the man-hours for assembling the heat shield plate, and it is possible to reduce the cost.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a center bearing according to the present invention, and FIG. 2 is a side view of a heat shield section as viewed from the direction of the line II-II in FIG. A ... Center bearing, 1 ... Connection shaft, 3 ... Outer ring,
5,50 ... Dust cover, 7 ... Housing, 51 ... Heat shield,
B ... Radiant heat receiving part.

Claims (1)

(57) [Scope of utility model registration request] 1. A center bearing which is arranged near a heating element and rotatably supports a connecting shaft for transmitting a driving force, the outer ring being fixed to a housing, and a pair fixed to both ends of the outer ring. And a dust cover, and at least one of the dust covers surrounds a radiant heat receiving portion that receives heat rays emitted from the heating element on the outer periphery of the outer ring, and a heat shield portion that shields radiant heat from the heating element. A center bearing characterized by being formed.