JP2519390Y2 - Ball bearings for mast rollers - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION This invention relates to a mast roller bearing for a forklift.

[0002]

2. Description of the Related Art As a mast roller bearing used in a mast of a forklift truck, a deep groove ball bearing is usually used because an axial load is applied in addition to a radial load.

[0003]

However, due to the large size of the forklift truck and the large models of 10 to 15 tons class, deep groove ball bearings have insufficient capacity and damage such as raceway surface indentation, raceway surface separation, and raceway ring cracking. Occurs a lot. On the other hand, although it is necessary to increase the load capacity of the bearing, it is impossible to increase the size of the bearing itself because the size of the mast of the forklift remains limited to a predetermined size. Therefore, it is necessary to increase the load capacity of the mast roller bearing without expanding the bearing mounting space.

The increase in the load capacity of the ball bearing in such a case is considered to increase the number of balls, for example, to the total number of balls, but in the deep groove ball bearing, the number of balls is increased to, for example, the total number of balls. In order to do this, a ball insertion notch groove must be formed in the bearing ring, but this has the problem of reduced load capacity for axial loads. This device is designed to increase the radial load of mast roller bearings without expanding the bearing mounting space.
The load capacity of the mast roller bearing is increased with respect to the axial load.

[0005]

In the mast roller bearing according to the present invention, two angular contact ball bearings are superposed so as to face each other, and the tires of both angular contact ball bearings are connected to the outside of both outer rings. The inward flange is formed on one side surface of the tire, a female screw is formed on the inner peripheral surface on the other side, and a set screw ring having a male screw on the outer peripheral surface is screwed into the female screw. Both outer rings are sandwiched by the flange and the set screw ring, and two angular contact ball bearings are integrally formed. The inner rings of the two angular contact ball bearings may be a common double-row inner ring.

[0006]

The mast roller bearing fixed to both ends of the fork shaft of the forklift truck is fitted into the mast having a U-shaped cross section, and the outer peripheral surface of the tire rolls by being guided by the opposing guide surfaces of the mast. , Which causes the fork to move up and down. By adjusting the screwing of the set screw ring, the degree of clamping of the two angular contact ball bearings with respect to the outer ring between the inward flanges is adjusted, and the preload of the angular contact ball bearings is adjusted.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A mast roller bearing according to an embodiment of the present invention will be described with reference to the drawings. In the mast roller bearing shown in FIG. 1, two angular contact ball bearings 1 and 2 are superposed facing each other, and further the outer ring 11 of both angular contact ball bearings 1 and 2 are
21 tires 3 are fitted on the outer sides of both outer races 11 and 21, and
Two angular contact ball bearings 1 and 2 are integrally formed.

More specifically, the tire 3 is a ring-shaped body having an inward flange 31 formed on one side surface and an internal thread 32 formed on the inner peripheral surface on the other side. Tire 3
Is press-fitted into the outer peripheral surfaces of the two angular total ball bearings 1 and 2 that face each other, and the outer end surface of the outer ring 11 of one angular total ball bearing 1 abuts the inner surface of the inward flange 31. The set screw ring 4 having a male screw formed on the outer peripheral surface thereof is screwed into the female screw 32, and the inner end surface of the set screw ring 4 is
The outer end surface of the outer ring 21 of the other angular contact ball bearing 2 is pressed. By adjusting the screwing of the set screw ring 4, the outer ring 1 of the two angular contact ball bearings with the inward flange 31
The degree of clamping against 1, 21, that is, the angular contact ball bearing 1,
The preload of 2 is adjusted to obtain a proper contact angle.

In the mast roller bearing shown in FIG. 1, the two angular contact ball bearings 1 and 2 are separate bearings, but as shown in FIG. The inner ring may be a common double row inner ring 12. Seals 5 and 6 are fitted on the outer sides of the angular contact ball bearings 1 and 2, respectively.

The mast roller bearing shown in FIG.
Excellent in bearing performance such as performance against oil leakage,
The mast roller bearing shown in FIG. 1 is convenient in manufacturing such as clearance adjustment.

Fork lift truck fork shaft S
The mast roller bearing fixed to both ends of the
As shown in Fig. 5, the fork is fitted into a mast M having a U-shaped cross section, and the outer peripheral surface of the tire 3 rolls by being guided by the opposing guide surface of the mast M so that the fork moves up and down while bearing radial and axial loads. You can

Since the above mast roller bearing is a total number of balls, the number of balls increases, the load capacity also increases accordingly, and the outer ring strength is increased by the addition of the tire 3 against radial load. Since the contact angles of the two angular contact ball bearings 1 and 2 face each other, they oppose the moment load.

[0013]

The mast roller bearing of the present invention does not increase the bearing mounting space, that is, the external dimensions, and the load capacity for radial load / axial load is increased and the load capacity for moment load is also increased. Without expanding the dimensions of the mast,
It is possible to cope with an increase in the weight of the ball. Moreover, by adjusting the preload by adjusting the screwing of the set screw ring, it is possible to obtain an appropriate contact angle required when the angular contact ball bearing is used.

[Brief description of drawings]

FIG. 1 is a sectional view of a mast roller bearing according to an embodiment of the present invention.

FIG. 2 is a sectional view of another mast roller bearing according to an embodiment of the present invention.

FIG. 3 is a configuration diagram of a mast roller bearing according to an embodiment of the present invention mounted on a mast of a forklift.

[Explanation of symbols]

 1 Angular full ball bearing 2 Angular full ball bearing 11 Outer ring 12 Double row inner ring 21 Outer ring 3 Tire 31 Inward flange 32 Female screw 4 Set screw ring 5 Seal 6 Seal

Claims (2)

(57) [Scope of utility model registration request] 1. Two angular contact ball bearings are overlapped facing each other, and tires extending over both outer rings of both angular contact ball bearings are fitted to the outer sides of both outer rings, and are attached to one side surface of the tire.
Has an inward flange, and has an internal thread on the inner peripheral surface on the other side.
Formed, the female screw has a male screw formed on the outer peripheral surface.
A screw ring is screwed in, and both outer rings have the above flange and set screw ring.
A ball bearing for a mast roller of a forklift, which is sandwiched by two and integrated with two angular contact ball bearings. 2. The ball bearing for a mast roller of a forklift according to claim 1, wherein the inner ring is a double-row inner ring.