JPH11101251A - Rolling bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lengthen the service life by installing a pair of shields composed of a cylinder part which has a longitudinal section L shape and is fitted to an inner ring inner peripheral surface on an outer peripheral surface and a flange part extending in the radial direction from its outside end, on an inner ring from both the axial directional ends. SOLUTION: A shield 20 is a press-molded steel plate of cross-sectional L-shaped member, and is composed of a cylinder part 22 fitted to an inner peripheral surface 12a of an inner ring 12 on an outer peripheral surface and a flange part 24 extending in the radial direction from one end, and a length of the cylinder part 22 is set so as to form a proper clearance between mutually facing end surfaces 23 when a pair of shields 20 are installed on a bearing 10. The inner ring 12 is set smaller in a width than an outer ring 14, and a dimension between outside end surface at shield 20 installing time is set almost equal to the width of the outer ring 14. A pair of shields 20 are installed on the inner ring 12 from the axial directional both sides, and this is installed on a shaft. Therefore, the flange part 24 extends up to the vicinity of an inner peripheral surface of the outer ring 14, and almost completely shields both end opening parts of the bearing 10, and blocks snow, ice or gravel, and prevents the deformation and damage of a seal 18, and the service life of the bearing 10 can be lengthened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling bearing, and more particularly, to a structure in which openings between inner and outer rings at both ends of a bearing are shielded by shields to prevent intrusion of dust, snow, ice blocks and other foreign matters. The present invention can be applied to snowmobile bogie wheel bearings, pulleys for automobile engine accessories, and the like.

[0002]

2. Description of the Related Art As shown in FIG. 4, a snowmobile travels on snow by a crawler or track (3) circulating between a driving sprocket (1) and a driven sprocket (2). A plurality of idler wheels (4) for guiding the truck (3) are arranged between the driving sprocket (1) and the driven sprocket (2). The driven sprocket (2) and the idler wheel (4) are generically called a bogie wheel (5).

[0003] The bogie wheel (5) is provided with a rolling bearing (1).
It is rotatably supported via 0). That is, as shown in FIGS. 5 and 6, the outer ring (14) is press-fitted into the hole (5a) of the bogie wheel (5) and positioned by the retaining ring (5b), and the outer peripheral surface (6a) of the shaft (6) is formed. The inner ring (12) is press-fitted and the bolt (7) is tightened, so that the shaft (6) and the inner ring (1) are located between the washer (8) and the frame (9).
2) has been concluded. Reference numeral 7a indicates a head of the bolt 7, and reference numeral 7b indicates a nut. Reference numeral 16 denotes a bearing (1
The rolling element incorporated between the inner and outer rings (12, 14) of (0), here refers to a steel ball, reference numeral 17 is a retainer, and reference numeral 18 is mounted between the inner and outer rings (12, 14). Refers to a normal seal.

[0004]

Since snowmobiles are designed to run on snow, bogie wheels (5)
Is in a harsh environment constantly exposed to snow and ice, deforming the seal (18) due to the collision of ice blocks and gravel, deteriorating the encapsulated grease due to the intrusion of moisture into the bearing, causing spillage and rust inside the bearing. Troubles such as poor rotation due to rust easily occur.

An object of the present invention is to extend the life of a rolling bearing in which a short life due to foreign matter intrusion becomes a problem.

[0006]

A rolling bearing according to the present invention comprises a pair of shields mounted on an inner ring from both sides in the axial direction. Each shield has an L-shaped vertical cross section, and has an outer peripheral surface on the inner peripheral surface of the inner ring. And a flange portion extending in the radial direction from the outer end of the cylindrical portion.

As in the second aspect of the present invention, the end surfaces of the cylindrical portions of the pair of shields may be brought into contact with each other.
In order to make the width (axial dimension) of the bearing integrated with the shield as accurate as possible, the length of the cylindrical part of the shield is set so that a gap is formed between the facing end faces of the pair of shields. Is preferred. Further, it is preferable that the outer diameter edge of the flange portion of the shield is located near the inner peripheral surface of the outer ring. Thereby, a kind of labyrinth is formed between the outer diameter edge of the shield and the inner peripheral surface of the outer ring, and the shielding effect of the shield is enhanced.

As in the invention of claim 3, it is preferable that the outer end face of the shield coincides with the end face of the outer ring or is located inside the end face of the outer ring. The width of the inner and outer rings can be made equal, but in that case, since the shield will be located outside the end surface of the outer ring, when the outer ring is stopped, water dripping from the end surface of the outer ring etc. This is because it easily enters the inside of the bearing. In addition, by reducing the thickness of the inner ring by an amount corresponding to the thickness of the shield, the increase in weight accompanying the addition of the shield is offset.

Further, the present invention integrates a shield into a snowmobile bogie wheel bearing, deforms the seal due to ice blocks, gravel or collisions, deteriorates and leaks the enclosed grease due to intrusion of moisture into the bearing, and causes the inside of the bearing to degrade. By preventing the occurrence of rust and the like, the life of the bearing is extended.

[0010] That is, according to a fourth aspect of the present invention, the inner ring is fixed to the shaft, the outer ring is fixed to the wheel, and seals are attached to both ends of the opening between the inner and outer rings, and a shield for shielding the opening is provided. It is characterized by having. The shield completely blocks the openings at both ends of the bearing, making it difficult for snow and ice to enter the inside of the bearing.Also, ice blocks and gravel flying near the bearing are shielded by the shield, so Deformation and damage are prevented.

According to a fifth aspect of the present invention, a pair of shields are mounted on the inner ring of the bearing from both sides in the axial direction. Each shield has an L-shaped vertical section, and the outer peripheral surface is fitted to the inner peripheral surface of the inner ring. It is characterized by comprising a cylindrical portion and a flange portion extending in a radial direction from an outer end of the cylindrical portion.

According to a sixth aspect of the present invention, the length of the cylindrical portion of the shield is set to such an extent that an appropriate clearance is formed between the opposed end surfaces of the pair of shields, and the outer diameter edge of the flange portion of the shield is formed. It is located near the inner peripheral surface of the outer ring.

According to a seventh aspect of the present invention, one of the pair of shields is disposed between the shoulder of the shaft and the end face of the inner ring, and the other shield is disposed between the washer and the head of the bolt. It is assumed that.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a pair of rolling bearings (20) for shielding both sides of a rolling bearing (10).
0) is shown as an integrated embodiment. This rolling bearing (10) fixes an inner ring (12) and fixes an outer ring (14).
Is used as an outer ring rotating type that rotates the outer ring.

The rolling bearing (10) includes an inner ring (12),
Outer ring (14), rolling element (16), cage (17)
And a seal (18). Inner ring (1
2) The width (axial dimension) of the outer ring (14) is smaller than that of the outer ring (14).
The dimension between the outer end faces of 0) is set to be substantially equal to the width of the outer ring (14). The width of the inner and outer rings (12, 14) can be made equal, but in that case, the shield (2
0) is located outside the end face of the outer ring (14), so that when the outer ring (14) is stopped, the outer ring (1)
Water or the like dripping from the end face of 4) easily enters the inside of the bearing. The inner peripheral surfaces at both ends of the outer ring (14) are gradually increased in diameter from the inside to the outside in the axial direction. The outer peripheral edge of the seal (18) is attached to an annular recess formed on the inner peripheral surface of the outer race (14), and the annular seal lip formed on the inner peripheral end is slidably contacted with the inner race (12).

Each shield (20) is a member formed by pressing a steel plate and having an L-shaped cross section, and a cylindrical portion (22) having an outer peripheral surface fitted to an inner peripheral surface (12a) of the inner race (12).
And a flange portion (24) extending radially from one end of the cylindrical portion (22). The length of the cylindrical part (22) is
When the pair of shields (20) are mounted on the bearing (10), the distance is set so that a suitable clearance is formed between the end faces (23) facing each other. Shield (20)
The outer end (25) of the flange portion (24) of the
0) is mounted on the bearing (10), and the outer ring (1) is
4) is located near the inner peripheral surface.

A pair of shields (20) are mounted on the inner ring (12) of the bearing (10) from both sides in the axial direction.
The bearing (10) integrated with 0) is mounted on the shaft (6). Therefore, the inner peripheral surface of the cylindrical portion (22) of the shield (20) becomes a fitting surface with the outer peripheral surface of the shaft. Cylindrical part (22)
May be brought into contact with each other,
By setting the length of the cylindrical portion (22) so as to leave a gap between the end faces (23), the width (axial dimension) of the bearing (10) integrated with the shield (20) can be accurately determined without variation. It can be.

The flange portion (24) of the shield (20) extends to the vicinity of the inner peripheral surface of the outer ring (14) to substantially completely cover the openings at both ends of the bearing (10). Ice is less likely to enter the inside of the bearing, and ice blocks and gravel flying near the bearing are also blocked by the shield (20), so that the seal (18) is prevented from being deformed or damaged. Longer life is achieved. Further, since the inner peripheral surfaces at both ends of the outer ring (14) increase in diameter from the inner side to the outer side in the axial direction, centrifugal force accompanying the rotation of the outer ring (14) causes the outer ring (1).
4) Water and other foreign matter near the end face are scattered.

The embodiment shown in FIG. 2 employs two shields (30a, 30b). One shield (30a) has a shoulder (6b) of the shaft (6) and an end face of the inner ring (12). And the other shield (30b) is disposed between the washer (8) and the head (7a) of the bolt (7). The shield (30b) may be arranged between the washer (8) and the end face of the inner ring (12).

As shown in FIG. 3, the shield (2
An iron plate pulley (40) can be attached to the outer ring (14) of the rolling bearing (10) with the 0). As already described with reference to FIG. 1, the double sealing action of the seal (18) and the shield (20) can surely prevent foreign matter from entering from outside, so that the field where short life due to dust intrusion becomes a problem. For example, it can be applied to an automobile engine auxiliary pulley and the like.

[0021]

According to the present invention, deformation and damage due to ice blocks and gravel colliding with the seal of the bearing, deterioration of the sealed grease due to intrusion of moisture into the bearing, outflow, and generation of rust inside the bearing are prevented. Thus, the life of the rolling bearing can be extended.

[Brief description of the drawings]

FIG. 1A is a longitudinal sectional view of a rolling bearing with a shield,
(B) is a longitudinal sectional view in a state where a shield is removed.

FIG. 2 is a longitudinal sectional view showing another embodiment.

FIG. 3 is a longitudinal sectional view showing another embodiment.

FIG. 4 is a perspective view of a snowmobile.

FIG. 5 is a longitudinal sectional view of a bearing portion of the bogie wheel.

FIG. 6 is an enlarged view of a bearing portion.

[Explanation of symbols]

 Reference Signs List 5 bogie wheel 6 shaft 6a outer peripheral surface 6b shoulder 7 bolt 7a head 7b nut 8 washer 9 frame 10 bearing 12 inner ring 14 outer ring 16 rolling element 17 retainer 18 seal 20 shield 22 cylindrical part 23 inner end 24 flange part 25 outer diameter Edge 30a, 30b Shield 40 Pulley

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Marcus August Wickert Canada, Ontario, Mississauga, Canada 6595 NTN Bearing Corporation of Canada Limited (72) Inventor Takahiro Kanemoto Mie (2) Inventor Tsutomu Mizutani 183-1 Oyama, Tado-cho, Kuwana-gun, Mie Prefecture

Claims (7)

[Claims] 1. A pair of shields are attached to an inner ring from both sides in the axial direction. Each shield has an L-shaped longitudinal section, and a cylindrical portion fitted on the outer peripheral surface to the inner peripheral surface of the inner ring; A rolling bearing comprising a flange portion extending radially from an outer end. 2. The length of the cylindrical portion of the shield is set to such a degree that a gap is formed between the opposed end surfaces of the pair of shields, and the outer peripheral edge of the flange portion of the shield is set near the inner peripheral surface of the outer ring. The rolling bearing according to claim 1, wherein the rolling bearing is located. 3. The rolling bearing according to claim 1, wherein an outer end surface of the shield is made to coincide with an end surface of the outer ring or located inside the end surface of the outer ring. 4. An inner ring is fixed to a shaft, an outer ring is fixed to a wheel, and a seal is provided at both ends of the opening between the inner and outer rings, wherein a shield for shielding the opening is provided. Rolling bearings for snowmobile bogie wheels. 5. A pair of shields are attached to the inner ring of the bearing from both sides in the axial direction, and each shield has an L-shaped vertical cross section.
5. The rolling bearing for a snowmobile bogie wheel according to claim 4, comprising a cylindrical portion fitted on the inner peripheral surface of the inner ring at an outer peripheral surface, and a flange portion extending radially from an outer end of the cylindrical portion. 6. The length of the cylindrical portion of the shield is set to such a degree that a gap is formed between opposed end surfaces of the pair of shields, and the outer diameter edge of the flange portion of the shield is located near the inner peripheral surface of the outer ring. The rolling bearing for a bogie wheel of a snowmobile according to claim 5, which is located. 7. The bogie of a snowmobile according to claim 4, wherein one of the pair of shields is disposed between the shoulder of the shaft and the end surface of the inner race, and the other shield is disposed between the washer and the head of the bolt. Rolling bearing for wheels.