JP2012117565A - Wheel support structure for motorcycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wheel support structure for a motorcycle, which includes a ball bearing with a magnetic encoder accurately detecting rotation speed without impairing assemblability.SOLUTION: In the wheel support structure for a motorcycle, a surface where a magnetic encoder of a ball bearing 21a with the magnetic encoder, which is one of two single row ball bearings 4 and 21a, is detected in provided not in a surface perpendicular to the shaft limited in dimension but in the inner peripheral surface of a cylinder extended in the axial direction, so that a large axial length and large area per pole can be thereby secured. Alternatively, the magnetic encoder can be provided inside a space surrounded by the two rows of bearings 4 and 21a and a hub 6, not on a fork 2 side limited in axial dimension, enough space between both the bearings can be used, and the area per pole can be secured larger.

Description

  The present invention relates to a wheel support structure for a motorcycle including a ball bearing with a magnetic encoder used for detecting the rotational speed of a wheel of a motorcycle such as a motorcycle or a scooter.

  An anti-lock brake system (ABS) is widely used as a device for stabilizing the running state of an automobile. Conventionally, such ABS has been widely used mainly for four-wheeled vehicles, but in recent years, it has begun to be adopted for motorcycles. As is well known, since it is necessary to determine the rotational speed of the wheel in order to control the ABS, it is possible to incorporate a rotational speed detection device into the wheel bearing ball bearing unit for rotatably supporting the wheel on the suspension device. It has been widely practiced.

However, the structure of the rotational speed detection device for a four-wheeled vehicle cannot be applied to a motorcycle as it is. There are two main reasons for this (1) and (2).
(1) Wheel support ball bearings for motorcycles are considerably smaller than wheel support ball bearings for automobiles.
(2) While many of the wheel bearing ball bearings for four-wheeled vehicles are of the inner ring rotating type, most of the wheel supporting ball bearings for motorcycles are of the outer ring rotating type.

FIG. 5 shows a structure of a part that rotatably supports a front wheel of a relatively small motorcycle such as a scooter as an example of a wheel support structure of the motorcycle.
The wheel support structure 1 of this motorcycle is fitted into two rows of single-row ball bearings 4 and 4 and inner rings of the two rows of single-row ball bearings 4 and 4, and both ends of the forks 2 and 2 A support shaft 3 coupled to the vehicle body side via a hub, and a hub 6 that is fitted to the outer ring of two rows of single-row ball bearings 4 and 4 and rotatably supports a tire via a wheel 7. Yes.
Inner ring spacers 5a and 5c are provided between the inner rings of the two rows of single row ball bearings 4 and 4 and the forks 2 and 2, and an inner ring spacer 5b is provided between the inner rings of the two rows of single row ball bearings 4 and 4. So that an excessive axial load is not applied to the two rows of single-row ball bearings 4, 4 even if the support shaft 3 is fastened and fixed from both ends via nuts 8.

  On the other hand, a rotational speed detection device using a ball bearing with a magnetic encoder as described in Patent Document 1, for example, has been known as a rotational speed detection device for obtaining the rotational speed of a wheel in order to incorporate ABS in a motorcycle. It has been.

  FIG. 6 shows an example of a ball bearing with a magnetic encoder described in Patent Document 1. This ball bearing 10 with a magnetic encoder includes an outer ring 11 that is a rotating wheel, an inner ring 12 that is a fixed ring, and a plurality of balls 13 that are rolling elements provided between the outer ring 11 and the inner ring 12 so as to be freely rollable. A retainer 14 that rotatably holds the plurality of balls 13 at substantially equal intervals, a sealing plate 15 that is attached to an end portion in the axial direction of the outer ring 11 and that is in sliding contact with the inner ring 12, and magnetically outward in the axial direction. An encoder 9 is attached and fixed, and includes a sealing plate 16 with a magnetic encoder that is attached to the other end portion in the axial direction of the outer ring 11 and that is in sliding contact with the inner ring 12.

  Such a ball bearing with magnetic encoder 10 is replaced with, for example, one of the ball bearings 4 of the pair of ball bearings 4 and 4 incorporated in the structure shown in FIG. Can be detected, that is, the rotational speed of the wheel of the motorcycle.

  An example of a wheel support structure for a motorcycle including such a ball bearing with a magnetic encoder is shown in FIG. FIG. 7 shows a simplified shape, but the basic structure is the same as FIG. 5, and the same or equivalent components are denoted by the same reference numerals. The difference from FIG. 5 is that one of the pair of ball bearings 4 and 4 is replaced with a ball bearing 10 with a magnetic encoder. And the magnetic sensor 18 is being fixed to the inner ring spacer 5b which does not rotate so that a magnetic detection surface may oppose the magnetic encoder detected surface of the ball bearing 10 with a magnetic encoder. The output of the magnetic sensor 18 is transmitted to an external arithmetic unit (not shown) via the harness 19, and is appropriately used for, for example, brake control performed by calculating a deviation from rotation speed information determined in advance in the ABS device. Used.

JP 2007-321894 A

  However, as described above, wheel support ball bearings for motorcycles are considerably smaller than wheel support ball bearings for four-wheeled vehicles, and the size of usable magnetic encoders is limited. As a result, the magnetic flux density per pole is smaller than that of a magnetic encoder for a four-wheeled vehicle. Therefore, in order to detect the number of rotations with high accuracy, air that is a gap between the sensor and the magnetic encoder is sacrificed at the expense of assembly. It was necessary to reduce the gap or reduce the number of poles in the circumferential direction of the magnetic encoder at the expense of resolution.

  The present invention has been made to solve the above problems, and the wheel support structure for a motorcycle according to the present invention is fitted to two rows of single row ball bearings and an inner ring of the two rows of single row ball bearings. And a hub that is fitted to the outer ring of the two rows of single row ball bearings and that supports both ends of the tire rotatably via the wheels. A wheel support structure for a motorcycle comprising: a single-row ball bearing of the two rows of single-row ball bearings: an outer ring that is a rotating wheel; an inner ring that is a fixed ring; the outer ring and the inner ring; A ball which is a plurality of rolling elements arranged to be freely rollable in the circumferential direction, a cage which holds the plurality of balls rotatably at substantially equal intervals, and one end in the axial direction of the outer ring A sealing plate that is attached to the inner ring and is in sliding contact with the inner ring; and And a cylindrical encoder mounting plate having a magnetic encoder attached thereto and extending outwardly of the bearing. The magnetic encoder mounting plate is on the other side of the single row ball bearing in the axial direction. As described above, the sealing plate is arranged to be opposite to the other single-row ball bearing in the axial direction, and is fixed to a non-rotating member so that the sensor detection surface faces the detection surface of the magnetic encoder The magnetic sensor is provided.

In the wheel support structure for a motorcycle of the present invention, the detected surface of the magnetic encoder of the ball bearing with a magnetic encoder, which is one of the two rows of single row ball bearings, does not face the shaft with a limited dimension, but extends in the axial direction. Since the axial length can be increased by providing it on the inner circumferential surface of the cylinder, it is possible to increase the area per pole.
In addition, by providing the magnetic encoder on the inner side surrounded by the two rows of bearings and the hub instead of the fork side, which is dimensionally limited in the axial direction, it is possible to use the space between the two bearings. Therefore, it is possible to provide a wheel support structure for a motorcycle including a ball bearing with a magnetic encoder capable of accurately detecting the rotation speed without sacrificing assembling performance.

1 is a cross-sectional view of a main part for explaining a wheel support structure of a motorcycle capable of detecting a rotation speed of a wheel according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of a main part for explaining a ball bearing with a magnetic encoder used in the wheel support structure of the motorcycle shown in FIG. 1. FIG. 6 is a cross-sectional view of a main part for explaining another example of a ball bearing with a magnetic encoder used in a wheel support structure for a motorcycle. FIG. 6 is a cross-sectional view of a main part for explaining another example of a ball bearing with a magnetic encoder used in a wheel support structure for a motorcycle. It is sectional drawing which shows an example of the wheel support structure of the conventional motorcycle. It is sectional drawing which shows an example of the conventional ball bearing with a magnetic encoder. It is sectional drawing which shows an example of the wheel support structure of the motorcycle provided with the conventional ball bearing with a magnetic encoder.

  A motorcycle wheel support structure 20 capable of detecting the rotational speed of a wheel shown in FIG. 1 according to an embodiment of the present invention is, for example, a pair of motorcycle wheel support structures 1 incorporated in the motorcycle shown in FIG. Instead of one of the ball bearings 4, 4, a ball bearing 21 a with a magnetic encoder as shown in FIG. 2 is incorporated between the outer peripheral surface of the support shaft 3 and the inner peripheral surface of the hub 6, and the magnetic The sensor 18 is fixed to the inner ring spacer 5 b that does not rotate so that the sensor detection surface faces the detection surface of the magnetic encoder 34.

  Although FIG. 1 shows a simplified shape, the basic structure is the same as FIG. 5, and the same or equivalent components are denoted by the same reference numerals.

  As shown in FIG. 1 and FIG. 2, the ball bearing 21 a with a magnetic encoder is fixed to the support shaft 3 and the outer ring 22 that is a rotating wheel that rotates together with the wheel 7 by being fitted inside the hub 6. An inner ring 24 that is a fixed ring that does not rotate, balls 26 that are a plurality of rolling elements that are rotatably arranged in the circumferential direction between the outer ring 22 and the inner ring 24, and the plurality of balls 26 that are arranged at substantially equal intervals. A retainer 27 that is rotatably held, a sealing plate 28 that is attached to one end of the outer ring 22 in the axial direction and slidably contacts the inner ring 24, and is attached to the other end of the outer ring 22 in the axial direction. And a cylindrical encoder mounting plate 35a attached to the magnetic encoder 34 and extending outward from the bearing.

  The sealing plate 28 is formed in an annular shape by covering a core metal 29 as a reinforcing member with an elastic member 30. A seal fixing groove 23 is formed on the inner peripheral surface of one end of the outer ring 22 in the axial direction. By fitting the outer peripheral portion of the sealing plate 28 into the seal fixing groove 23 using the elasticity of the elastic member, The sealing plate 28 is fixed to the outer ring 22. A seal groove 25 is formed on the outer peripheral surface of one end in the axial direction of the inner ring 24 facing the seal fixing groove 23, and a seal lip provided on the inner peripheral portion of the sealing plate 28 in the seal groove 25. 31 is in sliding contact.

  The magnetic encoder 34 is a cylindrical member in which N poles and S poles are alternately and continuously arranged in the circumferential direction, and is fixedly attached to the inner peripheral surface of the cylindrical encoder mounting plate 35a. The encoder mounting plate 35a is fixed to the inner peripheral surface 32 of the other end surface in the axial direction of the outer ring 22 so as to rotate integrally with the outer ring 22 by means such as press fitting, and is fixed so as to extend outward of the bearing of the outer ring 22. ing.

  As shown in FIG. 1, such a ball bearing with magnetic encoder 21 a has an outer peripheral surface of the support shaft 3 and an inner periphery of the hub 6 so that the magnetic encoder 34 is on the side of the ball bearing 4 that is the other ball bearing. Built in between the faces.

The magnetic sensor 18 detects the rotation of the outer ring 22 by detecting, as a magnetic pulse, a change in magnetic flux density generated on the detected surface of the magnetic encoder 36 that rotates integrally with the outer ring 22.
The inner ring spacer 5b to which the magnetic sensor 18 is attached and the support shaft 3 are provided with a hole or groove through which the harness 19 is passed, and the harness 19 is drawn out without passing through the rotating part. . Then, the rotational speed information detected by the magnetic sensor 18 is transmitted to an external arithmetic unit (not shown) by the harness 19 and, for example, a deviation from rotational speed information predetermined in the ABS device is calculated. Is suitably used for brake control or the like performed by.

  In FIG. 1, the magnetic sensor 18 is fixed to the inner ring spacer 5 b that does not rotate. However, if the sensor detection surface can be arranged with an appropriate gap so as to face the detection surface of the magnetic encoder 36, the support shaft If it is a member which does not rotate, such as fixing directly to 3, it may be fixed anywhere.

  FIG. 3 and FIG. 4 are main part sectional views for explaining another example of a ball bearing with a magnetic encoder used in a wheel support structure of a motorcycle. The ball bearings 21b and 21c with a magnetic encoder shown in FIGS. 3 and 4 are similar to the ball bearing 21a with a magnetic encoder shown in FIG. 2, and the wheel support structure of the motorcycle can detect the rotational speed of the wheel as shown in FIG. 20 can be used.

  The encoder mounting plate 35b of the ball bearing with magnetic encoder 21b shown in FIG. 3 is folded back radially inward at one end in the axial direction of the cylindrical portion 36a and the cylindrical portion 36a. It consists of the disk part 37a which a side end surface adjoins. Since a labyrinth seal can be formed between the disk portion 37a and the outer peripheral surface of the inner ring 24 to prevent the outflow of lubricant such as grease inside the bearing 21b, it is necessary to add a separate seal for suppressing the outflow of grease. No.

The encoder mounting plate 35c of the ball bearing with magnetic encoder 21c shown in FIG. 4 includes a cylindrical part 36b, a disk part 37b folded back radially inward at one axial end of the cylindrical part 36b, and a disk part. It consists of a seal lip 38 provided on the inner periphery of 37b.
A seal groove 33 similar to the seal groove 25 on the other end surface is formed on the outer peripheral surface of the inner ring 24a of the inner ring 24a of the ball bearing with magnetic encoder 21c on the axial direction side, and the seal lip 38 is formed in the seal groove 33. It is in sliding contact. With this configuration, the sealing performance can be further improved as compared with the ball bearing with magnetic encoder 21c shown in FIG.

As described above, according to the present invention, the detected surface of the magnetic encoder of the ball bearing with a magnetic encoder, which is one of the two rows of single row ball bearings, does not face the shaft with limited dimensions, but extends in the axial direction. Since the axial length can be increased by providing it on the inner circumferential surface of the cylinder, it is possible to increase the area per pole.
In addition, by providing the magnetic encoder on the inner side surrounded by the two rows of bearings and the hub instead of the fork side, which is dimensionally limited in the axial direction, it is possible to use the space between the two bearings. Can be used as a wheel support structure for a motorcycle including a ball bearing with a magnetic encoder capable of accurately detecting the number of rotations without sacrificing assembly.

1 Wheel support structure for motorcycles
2 forks
3 Support shaft
4 Single row ball bearing
5a, 5b, 5c Inner ring spacer
6 Hub
7 wheel
8 Nut
9 Magnetic encoder
10 Ball bearing with magnetic encoder
11 Outer ring
12 Inner ring
13 balls
14 Cage
15 Sealing plate
16 Sealing plate with magnetic encoder
17 Wheel support structure for motorcycles
18 Magnetic sensor
19 Magnetic sensor harness
20 Motorcycle wheel support structure
21a, 21b, 21c Ball bearing with magnetic encoder
22 Outer ring
23 Seal fixing groove
24 inner ring
25 Seal groove
26 balls
27 Cage
28 Sealing plate
29 Core
30 Elastic member
31 Seal lip
32 Inner surface of outer ring
33 Seal groove
34 Magnetic encoder
35a, 35b, 35c Encoder mounting plate
36a, 36b Cylindrical part
37a, 37b Disc
38 Seal lip

Claims (3)

Two rows of single row ball bearings, a support shaft that is fitted to the inner ring of the two rows of single row ball bearings and whose both ends are coupled to the vehicle body via forks, and the two rows of single row balls A wheel support structure for a motorcycle comprising a hub fitted to an outer ring of a bearing and rotatably supporting a tire via a wheel,
One of the two rows of single row ball bearings is:
An outer ring that is a rotating wheel;
An inner ring that is a fixed ring,
Balls that are a plurality of rolling elements arranged to be freely rollable in the circumferential direction between the outer ring and the inner ring,
A holder for rotatably holding the plurality of balls at substantially equal intervals;
A sealing plate attached to one end in the axial direction of the outer ring and in sliding contact with the inner ring;
A cylindrical encoder mounting plate that is attached to the other end in the axial direction of the outer ring and has a magnetic encoder attached and fixed to the inner peripheral surface, and extends outwardly from the bearing;
A ball bearing with a magnetic encoder with
The sealing plate is arranged so as to be opposite to the other single row ball bearing in the axial direction so that the magnetic encoder mounting plate is on the other side of the single row ball bearing in the axial direction,
A wheel support structure for a motorcycle, comprising: a magnetic sensor fixed to a non-rotating member so that the sensor detection surface faces the detection surface of the magnetic encoder.   The encoder mounting plate is composed of a cylindrical portion and a disk portion which is folded back radially inward at one axial end of the cylindrical portion and has an inner diameter side end surface close to the outer peripheral surface of the inner ring. The wheel support structure for a motorcycle according to claim 1.   The encoder mounting plate is provided on a cylindrical portion, a disk portion folded inward in the radial direction at one axial end of the cylindrical portion, and a seal that is slidably contacted with the inner ring. The wheel support structure for a motorcycle according to claim 1, comprising a lip.

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