JPH09164802A - Axle structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To exchange a hub bolt without making an axle hub large in a radial direction by providing a cutout which does not interfere with the removing locus of the hub bolt at the outer periphery of the flange side of an axle hub of a knuckle. SOLUTION: A cutout 58 is formed at the front side of a vehicle in the outer periphery of an annular part 30A of a knuckle 30 and it is curvedly cut away so that it does not interfere with a removing locus when hub bolts 20 are removed. Moreover, the cutout 58 is made also in the middle of a pair of knuckle flanges. Since the cutout 58 is formed at the front side of the vehicle in the outer periphery of the annular part 30A of the knuckle 30, if the cutout is used, the hub bolts 20 can be removed from bolt inserted holes 18 along the removing locus without interfering with the annular part 30A of the hub bolts 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an axle structure in which a disc wheel is fixed to a flange portion of an axle hub supported by a knuckle via bearings by a hub bolt inserted from the knuckle side.

[0002]

2. Description of the Related Art Generally, a tire is mounted on an axle hub, and in addition to a disc wheel that holds the tire, a disc rotor that is a component of a disc brake device includes a hub bolt and a hub nut. Are fastened together. As an example of disclosure of this type of configuration, Japanese Utility Model Laid-Open No. 62-137801 can be cited, which will be briefly described below.

As shown in FIG. 5, a shaft portion 104A of an axle hub 104 is axially supported by a shaft center portion of the knuckle 100 via an angular ball bearing 102. A bolt insertion hole 106 is formed in the vicinity of the outer peripheral edge of the flange portion 104B of the axle hub 104, and a hub bolt 108 is inserted into the bolt insertion hole 106. Further, the mounting portion 110A of the disc rotor 110 is arranged in contact with the outside of the flange portion 104B of the axle hub 104. The mounting portion 110A is formed into a cylindrical shape with a bottom, and the hub bolt 1 is attached to the outer periphery of the bottom portion.
A bolt insertion hole 112 for inserting 08 is formed. Further, the mounting portion 110 of the disc rotor 110
On the outside of A, a disc portion 114A of a disc wheel 114 to which a tire (not shown) is attached is arranged in a contact state. This disk portion 114A is also formed in a flat bottomed cylindrical shape, and a bolt insertion hole 116 for inserting the hub bolt 108 is formed on the outer periphery of the bottom portion thereof.

In assembly, the hub bolt 108 protruding from the flange portion 104B of the axle hub 104 is inserted through the bolt insertion hole 112 of the disc rotor 110 and the bolt insertion hole 116 of the disc wheel 114 in this order, and then the hub nut 118 is attached to the hub bolt 108. Screw it on. As a result, the disc rotor 110 and the disc wheel 114 are attached to the flange portion 104 of the axle hub 104.
It is tightened together with B.

By the way, the hub bolt 108 described above is
It may break due to excessive axial force or seizure of bolts. In this case, it may be possible to replace the entire axle hub 104 and the like, but from the viewpoint of the burden on the user and the request for resource saving, it is desirable to replace only the hub bolt 108.

Therefore, in view of this point, in the above-described conventional structure, the outer diameter of the flange portion 104B of the axle hub 104 is increased to set the formation position of the bolt insertion hole 106 to the outer side in the radial direction, whereby the hub bolt 108 is formed. Has a space for removal. That is, the bolt insertion hole 106
By setting the forming position of the outer side in the radial direction, when the hub bolt 108 is detached from the bolt insertion hole 106, the head portion of the hub bolt 108 interferes with the knuckle 100 and becomes unremovable. . As a result, when the hub bolt 108 is broken, the hub bolt 108
Only the replacement work should be performed.

However, in this way, the axle hub 1
When the diameter of the flange portion 104B of 04 is increased, the axle hub 104 itself is also increased in size.
The mounting portion 110A of 10 also has a large diameter and becomes large. Therefore, the design space of the disc brake device is narrowed,
For example, the friction area of the brake pad may be reduced, or the heat radiation area of the disc rotor 110 may be reduced.

In view of the above facts, it is an object of the present invention to obtain an axle structure capable of exchanging hub bolts without increasing the size of the axle hub or the like in the radial direction.

[0009]

According to a first aspect of the present invention, a bolt insertion hole is provided in a flange portion of an axle hub supported by a knuckle via a bearing, and the bolt is inserted into the bolt insertion hole from the knuckle side. It is an axle structure for fixing a disc wheel to a flange portion of an axle hub by a hub bolt, and a notch portion for avoiding interference with a removal trajectory of the hub bolt is provided on an outer peripheral portion of the knuckle on a flange portion side of the axle hub. There is.

According to a second aspect of the present invention, in the first aspect of the invention, the notch is provided on at least one of a vehicle front side and a vehicle rear side in an outer peripheral portion of the knuckle. .

According to a third aspect of the present invention, in the second aspect of the invention, the cutout portion is provided between a pair of knuckle flange portions that are integrally provided on the knuckle and that are connected to a caliper mounting bracket. , Is characterized.

According to the first aspect of the present invention, when the hub bolt is broken and needs to be replaced, the hub bolt is removed to the knuckle side. Here, in the present invention, since the notch is provided in the outer peripheral portion of the knuckle on the flange portion side of the axle hub to avoid interference with the removal trajectory of the hub bolt, the hub bolt can be removed and pulled out using this notch. . Therefore, according to the present invention, it is not necessary to increase the diameter of the flange portion of the axle hub so that the hub bolt can be replaced.

According to the second aspect of the present invention, first aspect is provided.
In the invention described above, since the aforementioned notch is provided on at least one of the vehicle front side and the vehicle rear side in the outer peripheral portion of the knuckle, it is possible to considerably suppress the influence of the local decrease in the rigidity of the knuckle on the bearing creep performance and the like. . That is, if a notch is provided on the outer periphery of the knuckle,
The rigidity of the cutout forming portion is reduced. Here, since the load input to the axle hub is based on the road surface input, the load basically acts in the vehicle vertical direction. Therefore, if a notch is provided on the outer peripheral portion of the knuckle in the vehicle up-down direction, the above-mentioned decrease in rigidity may lead to a decrease in bearing creep performance and may cause a problem of noise generation between the bearing and the knuckle. There is. However, such a problem does not occur if the notch is provided in at least one of the vehicle front side and the vehicle rear side in the outer peripheral portion of the knuckle as in the present invention.

According to the third aspect of the present invention, a second aspect is provided.
In the invention described, since the notch described above is provided between the pair of knuckle flanges that are integrally provided on the knuckle and that are connected to the caliper mounting bracket,
It is possible to minimize the influence of the local decrease in the rigidity of the knuckle. That is, the pair of knuckle flange portions of the knuckle is connected to the caliper mounting bracket to increase the rigidity. And by providing the notch between the pair of knuckle flanges that have been made highly rigid,
The influence of the local decrease in rigidity due to the formation of the notch on the above-mentioned bearing creep performance and the like can be minimized.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 shows a horizontal sectional structure of an axle structure according to this embodiment. As shown in this figure, the outer end of the axle 10 has a shaft portion 1 with a small diameter shaft.
2 is formed to project, and an axle hub 14 is arranged on the outer peripheral portion of the shaft portion 12. Axle hub 1
4 is configured to include a cylindrical shaft portion 14A and a disc-shaped flange portion 14B that is integrally provided on the outer end side of the shaft portion 14A and that extends outward in the radial direction. An annular recess 14C is formed so as to project from the axial center of the flange 14B. The shaft portion 14A of the axle hub 14 is spline-fitted to the outer peripheral portion of the shaft portion 12, and the nut 16 is screwed onto the tip portion of the shaft portion 12 in this state, whereby the axle hub 14 is fixed to the shaft portion 12. . Also, the flange portion 14B of the axle hub 14
A plurality of bolt insertion holes 18 are formed near the outer peripheral edge of the. The bolt insertion hole 18 has a flange portion 14B.
Are formed at predetermined intervals in the circumferential direction. Hub bolts 20 are inserted into the bolt insertion holes 18 from the knuckle 30 side described later.

Further, a bearing mounting recess 22 is formed on the outer peripheral portion of the shaft portion 14A of the axle hub 14, and an inner race 26 of an angular ball bearing 24 is relatively press-fitted into the recess 22. Also, the outer race 28 of the angular ball bearing 24 is
It is relatively press-fitted into the annular portion 30A of the knuckle 30. Thereby, the axle 10 and the axle hub 14
Are rotatably supported with respect to the knuckle 30.

The flange portion 1 of the axle hub 14 described above.
A disk rotor 32 is arranged outside 4B. The disc rotor 32 has a bottomed cylindrical mounting portion 32.
A and a disc-shaped flange portion 32B extending outward in the radial direction from the open end of the mounting portion 32A. A through hole 34 for inserting the recessed portion 14C of the axle hub 14 is formed in the axial center portion of the mounting portion 32A of the disc rotor 32. Further, the axle hub 1 is attached to the bottom of the mounting portion 32A of the disc rotor 32.
4 is in contact with the flange portion 14B, and the bolt insertion hole 3 is provided at a position coaxial with the bolt insertion hole 18 described above.
6 are formed.

Outside the disk rotor 32 described above,
A disc wheel 38 is arranged. The disc wheel 38 is composed of a disc portion 38A which is a mounting portion to the axle hub 14, and a rim portion 38B on which a tire is mounted and which holds the tire. At the axial center of the disc portion 38A of the disc wheel 38, the axle hub 1
A cylindrical portion 40 for inserting the recessed portion 14C of No. 4 is formed. Further, in the disc portion 38A of the disc wheel 38, a bolt insertion hole 42 is formed at a position coaxial with the above-described bolt insertion holes 18 and 36. Then, after the hub bolt 20 protruding from the flange portion 14B of the axle hub 14 is relatively penetrated through the bolt insertion hole 36 of the disc rotor 32 and the bolt insertion hole 42 of the disc wheel 38, the hub nut 44 is attached to the hub bolt 20.
The disc wheel 38 together with the disc rotor 32 are screwed together with the flange portion 1 of the axle hub 14.
It is fastened together with 4B.

In the above-mentioned structure, the disk rotor 32
Constitutes a main part of the disc brake device together with the caliper 46, and the structure of the caliper 46 will be briefly described below. As shown in FIG. 2, the caliper 46 includes a caliper mounting bracket 48 formed in a substantially U shape, a caliper body 50 formed so as to straddle the flange portion 32B of the disc rotor 32,
It has. A pair of knuckle flange portions 30B and 30C are extended outward in the radial direction from the annular portion 30A of the knuckle 30 at predetermined intervals, and both side portions of the caliper mounting bracket 48 are attached to the knuckle flange portions 30B and 30C. The lower end of is fixed by bolts 52. The caliper body 50 is slidably supported by the pair of slide pins 54 on the upper ends of both sides of the caliper mounting bracket 48. Inside the caliper body 50, the inner pad and the outer pad are provided with the flange portion 3 of the disc rotor 32.
It is arranged to face 2B. At the time of braking, the inner pad is pressed by the piston housed in the cylinder portion 56 of the caliper body 50, so that the flange portion 32 is pressed.
The caliper body 50 is slid by the reaction force generated by being pressed against one surface of B and the outer pad is flanged by the flange portion 32.
It is adapted to be pressed against the other surface of B.

Here, in the present embodiment, the notch 58 is formed at a portion on the vehicle front side in the outer peripheral portion of the annular portion 30A of the knuckle 30 described above. This notch 58
Has a curved notch in order to avoid interference with the removal locus when the hub bolt 20 is removed (see FIG. 3). Further, as shown in FIG. 2, the cutout portion 58 has a pair of knuckle flange portions 30B and 30C described above.
It is provided in the middle of.

Next, the operation and effect of this embodiment will be described. If the hub bolt 20 breaks, it needs to be replaced. Here, the flange portion 14B of the axle hub 14 in the present embodiment is not made large in diameter unlike the conventional structure, and the bolt insertion hole 18 of the hub bolt 20 is also formed at a position close to the annular portion 30A of the knuckle 30. Therefore, when the hub bolt 20 is simply removed, the head portion of the hub bolt 20 interferes with the annular portion 30A and cannot be removed (see the hub bolt 20 shown on the lower side in FIG. 1). . However, in the present embodiment, since the cutout portion 58 is formed in the vehicle front side portion of the outer peripheral portion of the annular portion 30A of the knuckle 30,
By using this cutout portion 58, the hub bolt 20 can be removed from the bolt insertion hole 18 along the removal locus shown in FIG. 3 without interfering with the hub bolt 20 with the annular portion 30A.

As described above, in this embodiment, the knuckle 30 is used.
Since the notch 58 for avoiding the interference with the removal locus of the hub bolt 20 is provided on the outer peripheral portion of the annular portion 30A, the replacement work of the hub bolt 20 without increasing the diameter of the flange portion 14B of the axle hub 14 and increasing the size thereof. It can be performed.

Further, in the present embodiment, the axle hub 14
Therefore, it is not necessary to increase the diameter of the mounting portion 32A of the disc rotor 32. Therefore, the design space of the disc brake device can be sufficiently secured, and the friction areas of the inner pad and the outer pad and the heat radiation area of the disc rotor 32 can be sufficiently secured. Therefore, the braking performance of the disc brake device can be favorably maintained.

Further, in this embodiment, since the above-mentioned cutout portion 58 is provided at the portion on the vehicle front side in the outer peripheral portion of the annular portion 30A of the knuckle 30, the local decrease in the rigidity of the knuckle 30 causes the bearing creep performance and the like. Can be significantly suppressed. That is, axle hub 1
Since the load input to 4 is based on the road surface input, the load basically acts in the vertical direction of the vehicle, and it is the load in this direction that affects the bearing creep performance. Here, touching on the mechanism of occurrence of the bearing creep phenomenon, focusing on the upward load F as an input load in FIG. 4, the surface pressure decreases at the arrow P portion on the opposite side, and slip due to load loss occurs. With
It is considered that the bearing creep phenomenon occurs due to a slight elastic deformation at the portion of the arrow Q which is the fitting surface with the inner race 26 immediately below the ball on the input load F side, and the fitting load decreases in the vicinity of this. Therefore, the annular portion 30A
The rigidity of the vehicle in the vertical direction is important, and it is preferable that the rigidity is not reduced. In view of this point, in the present embodiment, the cutout portion 5 that causes a local decrease in rigidity.
Since 8 is provided at the portion on the vehicle front side in the outer peripheral portion of the annular portion 30A of the knuckle 30, it is possible to considerably suppress the influence on the bearing creep performance. Further, by this, it is possible to prevent generation of abnormal noise between the bearing 24 and the knuckle 30 due to the local decrease in rigidity.

Further, in this embodiment, a pair of knuckle flange portions 30B, 3B provided integrally with the knuckle 30 and connected to the caliper mounting bracket 48.
Since the cutout portion 58 is provided between the 0C portions, it is possible to minimize the influence of the local decrease in the rigidity of the knuckle 30. That is, the pair of knuckle flange portions 30B and 30C of the knuckle 30 are connected to the caliper mounting bracket 48 to form a closed loop around the notch portion 58. Therefore, the rigidity of this portion is increased, and the pair of knuckle flange portions 30 having the high rigidity is provided.
By providing the notch 58 between B and 30C, it is possible to minimize the influence of the local decrease in rigidity due to the notch formation on the above-described bearing creep performance and the like.

Further, as described above, in the present embodiment, since it is not necessary to increase the diameter of the flange portion 14B of the axle hub 14 to increase the size, it is possible to reduce the weight of the axle hub 14 and the like. Therefore, the unsprung load can be reduced, which is advantageous in vehicle performance. Further, in the conventional structure, as shown in FIG. 5, the flange portion 104B of the axle hub 104 is made larger in diameter so that the hub bolt 108 can be removed, but at the same time, the flange portion 104B of the axle hub 104 is removed. A method of increasing the offset amount A between the end surface of the bearing 102 and the bearing 102 is often adopted. In this case, the longitudinal dimension of the shaft portion 104A of the axle hub 104 becomes long, and the axle hub 1
Although the rigidity of No. 04 is deteriorated, there is a risk that the steering stability of the vehicle is deteriorated due to this. However, according to the present embodiment, since the offset amount between the flange portion 14B of the axle hub 14 and the bearing 24 can be shortened, there is also an advantage that such a disadvantage is not brought about.

In the present embodiment, the notch portion 58 is provided at the portion on the vehicle front side in the outer peripheral portion of the annular portion 30A of the knuckle 30, but the invention is not limited to this, and the vehicle in the outer peripheral portion of the annular portion 30A is provided. It may be provided on the rear side,
It may be provided on both the vehicle front side and the vehicle rear side of the annular portion 30A.

Further, in this embodiment, the axle hub 14
Although the description has been given by taking as an example the axle structure in which the disk rotor 32 and the disk rotor 32 are formed separately, the present invention is not limited to this and the present invention is applied to an axle structure in which the axle hub 14 and the disk rotor 32 are integrally formed. You may apply.

[0030]

As described above, in the axle structure according to the present invention as set forth in claim 1, the outer peripheral portion of the knuckle on the flange portion side of the axle hub is provided with a notch portion for avoiding interference with the removal locus of the hub bolt. Therefore, it is possible to remove the hub bolt by utilizing the cutout portion, which has an excellent effect that the hub bolt can be replaced without increasing the size of the axle hub or the like in the radial direction.

In the axle structure according to the present invention described in claim 2, in the invention described in claim 1, since the notch is provided on at least one of the vehicle front side and the vehicle rear side in the outer peripheral portion of the knuckle, It has an excellent effect that the influence of the local decrease in rigidity on the bearing creep performance can be considerably suppressed.

According to a third aspect of the present invention, in the invention of the second aspect, the notch portion is provided between the pair of knuckle flange portions integrally provided on the knuckle and connected to the caliper mounting bracket. Since it is provided, it has an excellent effect that the influence of the local decrease in the rigidity of the knuckle can be minimized.

[Brief description of the drawings]

FIG. 1 is a horizontal sectional view showing an axle structure according to the present embodiment.

FIG. 2 is an overall configuration diagram of the axle structure shown in FIG. 1 viewed from the inside.

FIG. 3 is a cross-sectional view of relevant parts showing a state in which a hub bolt is removed using the cutout portion shown in FIG. 1.

FIG. 4 is an explanatory diagram for explaining the effect of the axle structure according to the present embodiment.

FIG. 5 is a cross-sectional view showing an axle structure according to a conventional example.

[Explanation of symbols]

 10 Axle 14 Axle hub 14B Flange part 18 Bolt insertion hole 20 Hub bolt 24 Angular ball bearing 30 Knuckle 30B Knuckle flange part 30C Knuckle flange part 38 Disc wheel 48 Caliper mounting bracket 58 Notch part

Claims (3)

[Claims] 1. An axle in which a bolt insertion hole is provided in a flange portion of an axle hub supported by a knuckle via a bearing, and a disc wheel is fixed to the flange portion of the axle hub by a hub bolt inserted from the knuckle side into the bolt insertion hole. The structure of the axle is characterized in that a notch is provided on the outer periphery of the knuckle on the flange side of the axle hub to avoid interference with the hub bolt removal trajectory. 2. The axle structure according to claim 1, wherein the cutout portion is provided on at least one of a vehicle front side and a vehicle rear side in an outer peripheral portion of the knuckle. 3. The axle structure according to claim 2, wherein the cutout portion is provided between a pair of knuckle flange portions that are integrally provided on the knuckle and that are connected to a caliper mounting bracket.