JPH0540093U - Bicycle head parts - Google Patents

Abstract

(57) [Abstract] [Purpose] In a bicycle head part, even if rainwater or muddy water enters the inside of the wheel body mounted on the fork stem or head pipe, the bearing and bearing support surface are not easily scratched or worn. To do so. A bearing supporting surface portion 7b is formed by a ring member 7 on a first wheel body 1 mounted on a fork stem 4, and a bearing supporting surface portion 8b is formed by a ring member 8 on a second wheel body 2 mounted on a head pipe 5. Has been formed. The seal member 9 for the bearing 6 acts as a seal between the ring members 7 and 8 at a position located on the inner peripheral side of the first ring body 1 and the second ring body 2 with respect to the bearing 6, and the first ring body is attached to the bearing 6. The first and second wheels 2 are provided so as to prevent foreign matter from entering from the inner peripheral side.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a first wheel body for bearing support mounted on a fork stem, a second wheel body for bearing support mounted on a head pipe, and an arrangement between the first wheel body and the second wheel body. The present invention relates to a bicycle head part including a bearing that rotatably assembles the first wheel body and the second wheel body.

[0002]

[Prior Art]

 In the bicycle head parts described above, conventionally, there is no means for preventing foreign matter from entering from the inner circumference side of the inner ring between the first wheel and the second wheel.

[0003]

[Problems to be solved by the device]

 Conventionally, if rainwater or muddy water adheres to the handle, it may travel down the fork stem and enter the inner circumference of the wheel body.If the vehicle body is upside down and supported, the body frame may already be supported. The muddy water that has entered the bottom bracket may travel through the down tube and enter the head pipe through the communication hole between the down tube and the head pipe. In such a case, water or mud may enter the side ring of the fork stem. There was a case where the bearing entered between the body and the ring on the head pipe side, and the ring and the bearing were scratched or worn, and the movement of the handle became poor. An object of the present invention is to provide a bicycle head part in which the head portion can be configured in a state where it is easy to avoid a malfunction or a shortened life due to the entry of foreign matter such as water.

[0004]

[Means for Solving the Problems]

 In order to achieve the object, the bicycle head part according to the present invention is the one described at the beginning, and prevents foreign matter from entering the bearing from the inner peripheral side of the first wheel body and the second wheel body. It is characterized in that it is provided with a sealing member. The action and effect are as follows.

[0005]

[Action]

 Even if rainwater or muddy water enters the inside of the 1st or 2nd wheel, it will be difficult for the bearings to enter because of the sealing by the sealing member, and scratches or abrasion due to foreign matter entering the bearings and the bearing contact parts of the wheel Is less likely to occur.

[0006]

[Effect of the device]

 It is now possible to obtain a head section that is excellent in terms of durability and reliability so that it is difficult for the handle to be operated even if foreign matter enters the inside of the first and second wheels, and it is difficult to operate.

[0007]

【Example】

 A pair of upper and lower first wheel bodies 1 and 1, a pair of upper and lower second wheel bodies 2 and 2, a pair of upper and lower bearing units A, and a lock nut 3 formed as shown in FIG. A bicycle head part for constituting a head part in which the fork stem 4 and the head pipe 5 of the vehicle body frame F are rotatably assembled relative to each other is configured, and is described in detail as follows. That is, as shown in FIG. 1, the lower first wheel body 1 is fitted onto the lower end portion of the fork stem 4 and is received and supported by the front wheel supporting fork portion 4 a connected to the fork stem 4. It is configured so that the fork stem 4 is mounted in a predetermined state by assembling it to the fork stem 4. The upper and lower second ring bodies 2 are attached to the head pipe 5 by press-fitting the mounting tube portion 2a formed so as to be fitted into the head pipe 5 into the upper end portion or the lower end portion of the head pipe 5. It is configured as follows. The upper first wheel 1 is screwed to the upper end side of the fork stem 4 by a mounting screw portion 1a formed so as to be externally fitted to the fork stem 4, and either the upper or lower bearing unit A is attached to the upper or lower side. It is configured to be attached to the fork stem 4 by being set to a tightening position where the second wheel 2 is pressed with a predetermined pressure. The lock nut 3 is screwed to the upper end side of the fork stem 4 and attached so as to prevent the upper first ring 1 from loosening, so that the lock nut 3 is brought into a predetermined mounted state.

As shown in FIG. 2, each of the upper and lower bearing units A is provided with a predetermined number of ball bearings 6, ..., A pair of ring members 7 and 8, and a pair of seal members 9 and 10. When the bearing unit A is clamped by the first wheel body 1 and the second wheel body 2 at a predetermined pressure due to the tightening force of the upper first wheel body 1, the ring members 7, 8 are The attachment surface portion 7a or 8a of the first wheel body 1 and the support surface portion 1b of the first wheel body 1 or the support surface portion 2b of the second wheel body 2 come into contact with each other to be supported by the first wheel body 1 or the second wheel body 2, It is a member that forms the bearing support surface portion 7b on the wheel body 1 and enables the ball bearing 6 to be supported by the first wheel body 1, or is a member that forms the bearing support surface portion 8b on the second wheel body 2. The ball bearing 6 can be supported by the second wheel 2. When the bearing unit A is released from the first wheel body 1 and the second wheel body 2, the ring members 7 and 8 can be removed from the first wheel body 1 and the second wheel body 2. In addition, the mounting surface portions 7a and 8a can be separated from the support surface portion 1b or 2b. The stopper ring 11 attached to one of the ring members 8 is configured to contact the ball bearing 6 to regulate the position of the ball bearing 6 with respect to the ring members 7 and 8, and Since the bearing supporting surface portions 7b and 8b of the ring members 7 and 8 have a curved surface shape to perform a bearing holding action, the seal members 9 and 10 are further mounted so as to be supported by the ring member 7 or 8. Therefore, the ball bearings 6, ..., The ring members 7, 8 and the seal members 9, 10 are assembled in one unit. That is, the ball bearing 6 and the ring members 7 and 8 of the bearing unit A are sandwiched by the support surface portion 1a of the first wheel body 1 and the support surface portion 2a of the second wheel body 2 at a predetermined pressure, so that the first wheel By arranging the ball bearing 6 between the body 1 and the second wheel 2, the ball bearing 6 is in a state in which the first wheel 1 and the second wheel 2 are relatively rotatably assembled.

As shown in FIG. 3, the seal members 9 and 10 are composed of a rubber seal main body and a metal ring 9a or 10a for exhibiting the seal strength and retaining the shape, and the ball bearing. 6 is configured to prevent foreign matter from entering from the inner peripheral side or the outer peripheral side of the wheels 1, 2. That is, when the bearing unit A is in a predetermined assembled state, one seal member 9 is located between the ring members 7 and 8 at a position located on the inner peripheral side of the wheel bodies 1 and 2 with respect to the ball bearing 6, and the other The seal member 10 is located between the ring members 7 and 8 on the outer peripheral side of the ring bodies 1 and 2 with respect to the ball bearing 6. Therefore, rainwater or muddy water travels down the fork stem 4 and enters the inner circumferences of the wheels 1 and 2, or rainwater or muddy water that has entered the bottom bracket (not shown) of the vehicle body frame F is turned upside down. Even if it enters the inside of the head pipe 5 through the down tube 12 and the gas vent hole 13 of the head pipe 5 as shown in FIG. 9 prevents. Further, even if rainwater or muddy water enters between the wheels 1 and 2 from the outer peripheral side of the wheels 1 and 2, the seal member 10 prevents the intrusion to the location where the ball bearing 6 is arranged.

As shown in FIG. 3, the contact portions of the ring members 7 and 8 with which the seal members 9 or 10 make contact are formed on the horizontal or substantially horizontal seal contact surfaces 7c or 8c. Due to the fact that the first wheel body 1 and the second wheel body 2 are assembled by being tightened in the direction of the rotation axis core, the first wheel body 1 and the second wheel body 2 are easily displaced in the direction orthogonal to the rotation axis core rather than the direction along the rotation axis core. Therefore, even if the seal member 9 or 10 and the ring member 7 or 8 move relative to each other due to this displacement, the seal member 9 or 10 presses the ring member 7 or 8 with a pressing force. It is designed to maintain the contact action while keeping the contact force as constant as possible. The path between the seal member 10 and the opening 14 or 15 facing the outside of the ring body of the bearing unit housing space between the first ring body 1 and the second ring body 2 is bent, or is relatively long. The orientations of the openings 14 and 15 are set so as to form a path, and the positional relationship between the openings 14 and 15 and the seal member 10 is set. That is, even if rainwater or muddy water enters the ring body through the openings 14 and 15, it is difficult to reach the seal member 10, or even if it reaches, the pressure is reduced and it is difficult to enter the ball bearing 6. ..

The members 16 and 17 shown in FIGS. 2 and 3 are elastic members, and act so that the bearing unit A assembled to the wheel bodies 1 and 2 is less likely to be misaligned in assembly. That is, when the bearing unit A is placed between the wheels 1 and 2 and is not tightened by the wheels 1 and 2, the elastic members 16 and 17 are inelastic as shown in FIG. In the deformed state, the bearing unit A is supported so that the attachment surface portions 7a and 8a of the ring members 7 and 8 do not come into contact with the support surface portions 1b and 2b of the wheels 1 and 2. Then, when the bearing unit A is tightened at a predetermined pressure, the elastic members 16 and 17 are elastically deformed by the tightening force so as to be accommodated inside the member accommodating concave portion of the wheel body 1 or 2. The ring members 7 and 8 are allowed to contact the support surface portions 1b or 2b of the wheels 1 and 2 so that the bearing unit A is supported in a predetermined mounting posture. That is, by preventing the ring members 7 and 8 from coming into contact with the wheels 1 and 2 until the bearing unit A is tightened under a predetermined pressure, the bearing unit A is installed in an abnormal posture. The ring members 7 and 8 come into contact with the wheels 1 and 2, and due to this contact, the wheels 1 and 2 support the unit, preventing the occurrence of improper assembly that is tightened in the abnormal assembly position. To do.

[Other Embodiments] FIG. 5 shows another structure of the seal members 9 and 10, showing a first seal tip portion 9b or 10b which is inserted into the recessed groove 7d of the ring member 7 and comes into contact with the ring member 7. A second seal tip portion 9c or 10c that comes into contact with the ring member 7 outside the recessed groove 7d is provided.

As in the first and second embodiments, by providing the ring member 7 or 8 as a member formed separately from the first wheel body 1 and the second wheel body 2, the first wheel body is provided. 1. In addition to forming a bearing support surface portion 7b or 8b for bearing support on the first and second wheel bodies 2, a bearing support surface portion corresponding to the bearing support surface portion 7b or 8b is directly attached to the first wheel body or the second wheel body. The present invention can also be applied to the case where it is formed in contact. Instead of the ball bearings 6, roller bearings or other bearings having various specific shapes may be adopted for implementation. Therefore, these are simply referred to as the bearing 6.

It should be noted that reference numerals are added to the claims of the utility model for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a bicycle head part in use.

FIG. 2 is a sectional view of the bicycle head parts in a separated state.

FIG. 3 is a sectional view of a bearing unit.

FIG. 4 is a cross-sectional view showing an operating state of an elastic member.

FIG. 5 is a cross-sectional view of another implementation seal member.

[Explanation of symbols]

 1 1st wheel 2 2nd wheel 4 Fork stem 5 Head pipe 6 Bearing 9 Seal member

Claims (1)

[Scope of utility model registration request] 1. A first wheel body (1) for bearing support mounted on a fork stem (4), a second wheel body (2) for bearing support mounted on a head pipe (5), and the first wheel. A bearing (6) which is arranged between a wheel body (1) and the second wheel body (2) and which rotatably assembles the first wheel body (1) and the second wheel body (2). A head part for a bicycle, comprising: the first wheel (1) and the second wheel (6) on the bearing (6).
A bicycle head part provided with a seal member (9) for preventing foreign matter from entering from the inner peripheral side of the wheel body (2).