JP3267132B2 - Axle structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an axle structure for fixing a disk wheel by a hub bolt inserted from a knuckle side into a flange portion of an axle hub supported on a knuckle via a bearing.

[0002]

2. Description of the Related Art In general, a tire is mounted on an axle hub, and in addition to a disk wheel for holding the tire, a disk rotor, which is one component of a disk brake device, includes a hub bolt and a hub nut. Has been tightened together. An example of this type of configuration is disclosed in Japanese Utility Model Application Laid-Open No. Sho 62-137801, which will be briefly described below.

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

In assembling, a bolt bolt 108 protruding from a flange portion 104B of an axle hub 104 is sequentially inserted through a bolt insertion hole 112 of a disk rotor 110 and a bolt insertion hole 116 of a disk wheel 114, and then a hub nut 118 is connected to the hub bolt 108. Screw. As a result, the disk rotor 110 and the disk wheel 114 are connected to the flange 104 of the axle hub 104.
B is fastened together.

The hub bolt 108 described above is
When an excessive axial force is applied or the bolt is seized, it may be broken. In this case, it is conceivable to replace the entire axle hub 104 and the like. However, from the viewpoint of the burden on the user and the demand for resource saving, it is desirable that only the replacement of the hub bolt 108 be performed.

In view of this point, in the conventional structure described above, the outer diameter of the flange portion 104B of the axle hub 104 is increased so that the position where the bolt insertion hole 106 is formed is set radially outward. The space for removing is secured. That is, the bolt insertion hole 106
By setting the formation position to the outside in the radial direction, when the hub bolt 108 is removed from the bolt insertion hole 106, it is possible to prevent the head of the hub bolt 108 from interfering with the knuckle 100 and making it impossible to remove. . Thereby, when the hub bolt 108 is broken,
Only the replacement work has to be performed.

However, as described above, the axle hub 1
When the diameter of the flange portion 104B of the axle hub 104 increases, the axle hub 104 itself also increases in size.
The ten mounting portions 110A also have a large diameter and a large size. For this reason, the design space of the disc brake device is reduced,
For example, it is conceivable that the friction area of the brake pad is reduced or the heat radiation area of the disk rotor 110 is reduced.

The present invention has been made in view of the above circumstances, and has as its object to provide an axle structure that allows replacement of hub bolts without increasing the size of an axle hub or the like in the radial direction.

[0009]

According to the first aspect of the present invention, a bolt insertion hole is provided in a flange portion of an axle hub supported on a knuckle via a bearing, and the bolt insertion hole is inserted into the bolt insertion hole from the knuckle side. An axle structure in which a disc wheel is fixed to a flange portion of an axle hub by a hub bolt, wherein a notch portion is provided on an outer peripheral portion of the knuckle on the flange portion side of the axle hub to avoid interference with a removal locus of the hub bolt. I have.

According to a second aspect of the present invention, in the first aspect of the present 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 notch is provided between a pair of knuckle flanges provided integrally with the knuckle and connected to a caliper mounting bracket. , Is characterized.

According to the first aspect of the present invention, when the hub bolt is broken and replaced, the hub bolt is removed to the knuckle side. Here, in the present invention, the notch is provided on the outer peripheral portion of the knuckle on the flange portion side of the axle hub to avoid interference with the removal locus of the hub bolt, so that the hub bolt can be removed and removed using the 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, the notch described above is provided on at least one of the vehicle front side and the vehicle rear side in the outer peripheral portion of the knuckle, so that the influence of a local decrease in the rigidity of the knuckle on the bearing creep performance and the like can be considerably suppressed. . That is, if a notch is provided on the outer periphery of the knuckle,
The rigidity of the notch forming portion decreases. Here, since the load input to the axle hub is based on the road surface input, the load basically acts in the vertical direction of the vehicle. Therefore, if a notch is provided on the outer peripheral portion of the knuckle on the vehicle vertical direction side, the aforementioned decrease in rigidity may cause a decrease in bearing creep performance or cause a problem of generation of abnormal noise between the bearing and the knuckle. There is. However, such a problem does not occur if a 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 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 a pair of knuckle flange portions provided integrally with the knuckle and connected to the caliper mounting bracket,
The effect of a local decrease in the knuckle stiffness can be minimized. That is, the pair of knuckle flange portions of the knuckle is connected to the caliper mounting bracket, thereby increasing rigidity. And by providing a notch between a pair of stiffened knuckle flange,
The influence of the local decrease in rigidity due to the formation of the notch on the bearing creep performance and the like described above is 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, a small-diameter shaft-shaped shaft portion 1 is provided at the outer end of the axle 10.
An axle hub 14 is arranged on the outer periphery of the shaft portion 12. Axle hub 1
Numeral 4 includes a cylindrical shaft portion 14A and a disk-shaped flange portion 14B integrally provided on the outer end side of the shaft portion 14A and extending outward in the radial direction. In addition, an annular concave portion 14C is formed to protrude from the axial center portion of the flange portion 14B. The shaft portion 14A of the axle hub 14 is spline-fitted to the outer peripheral portion of the shaft portion 12, and in this state, the axle hub 14 is fixed to the shaft portion 12 by screwing the nut 16 to the tip of 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 bolt. Note that the bolt insertion hole 18 is formed in the flange portion 14B.
Are formed at predetermined intervals in the circumferential direction. Hub bolts 20 are inserted into these bolt insertion holes 18 from the knuckle 30 side described later.

A recess 22 for mounting a bearing is formed in the outer periphery of the shaft portion 14A of the axle hub 14. The inner race 26 of the angular ball bearing 24 is press-fitted into the recess 22 relatively. The outer race 28 of the angular ball bearing 24 is
The knuckle 30 is press-fitted relatively into the annular portion 30A. Thereby, the axle 10 and the axle hub 14
Are rotatably supported by the knuckle 30.

The above-described flange portion 1 of the axle hub 14
A disk rotor 32 is arranged outside 4B. The disk rotor 32 has a bottomed cylindrical mounting portion 32.
A and a disk-shaped flange portion 32B extending radially outward from the open end of the mounting portion 32A. A through hole 34 is formed in the shaft center of the mounting portion 32A of the disk rotor 32 to allow the recess 14C of the axle hub 14 to pass therethrough. Further, an axle hub 1 is provided at the bottom of the mounting portion 32A of the disk rotor 32.
4 is in contact with the flange portion 14B, and is located coaxially with the bolt insertion hole 18 described above.
6 are formed.

Outside the above-described disk rotor 32,
A disc wheel 38 is arranged. The disc wheel 38 includes a disc portion 38A serving as a mounting portion to the axle hub 14, and a rim portion 38B on which a tire is mounted and which holds the tire. An axle hub 1 is provided at the axis of the disc portion 38A of the disc wheel 38.
A cylindrical portion 40 for inserting the four concave portions 14C is formed. Further, a bolt insertion hole 42 is formed in the disk portion 38A of the disk wheel 38 at a position that is coaxial with the above-described bolt insertion holes 18 and 36. Then, after the bolt insertion hole 36 of the disk rotor 32 and the bolt insertion hole 42 of the disk wheel 38 relatively penetrate the hub bolt 20 protruding from the flange portion 14B of the axle hub 14, the hub nut 44 is connected to the hub bolt 20.
Is screwed into the flange portion 1 of the axle hub 14 together with the disk rotor 32.
4B.

In the above configuration, the disk rotor 32
Constitutes the 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 32 </ b> B of the disk rotor 32,
It has. A pair of knuckle flange portions 30B and 30C extend radially outward from the annular portion 30A of the knuckle 30 at a predetermined interval, and the knuckle flange portions 30B and 30C are provided on both sides of the caliper mounting bracket 48. Is fixed at its lower end by bolts 52. The caliper body 50 is slidably supported by a pair of slide pins 54 at respective upper ends on 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 disk rotor 32.
2B. At the time of braking, the inner pad is pressed by the piston accommodated in the cylinder portion 56 of the caliper body 50, so that the flange portion 32 is pressed.
B, and the caliper body 50 slides due to the reaction force at that time, and the outer pad is
B is pressed against the other surface.

Here, in the present embodiment, the notch 58 is formed in the outer peripheral portion of the annular portion 30A of the knuckle 30 on the vehicle front side. This notch 58
Is cut out in a curved surface to avoid interference with the removal trajectory when the hub bolt 20 is removed (see FIG. 3). Further, as can be seen from FIG. 2, the notch 58 is formed with the pair of knuckle flange portions 30B and 30C described above.
Is provided in the middle.

Next, the operation and effect of this embodiment will be described. If the hub bolt 20 is broken, it must be replaced. Here, the flange portion 14B of the axle hub 14 in the present embodiment is not increased in diameter as in 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 of the hub bolt 20 interferes with the annular portion 30A and cannot be removed (see the hub bolt 20 shown in the lower side of FIG. 1). . However, in the present embodiment, the notch 58 is formed at a position on the outer side of the annular portion 30A of the knuckle 30 on the vehicle front side.
By using the notch 58, the hub bolt 20 can be removed from the bolt insertion hole 18 along the removal locus shown in FIG. 3 without causing the hub bolt 20 to interfere with the annular portion 30A.

As described above, in the present embodiment, the knuckle 30
The outer peripheral portion of the annular portion 30A is provided with a cutout portion 58 for avoiding interference with the removal locus of the hub bolt 20, so that the hub bolt 20 can be replaced without increasing the diameter of the flange portion 14B of the axle hub 14 and increasing the size. It can be performed.

In this embodiment, the axle hub 14
It is not necessary to increase the diameter of the mounting portion 32A of the disk rotor 32 because it is not necessary to increase the diameter. For this reason, a sufficient design space for the disc brake device can be secured, and a friction area between the inner pad and the outer pad and a heat radiation area of the disc rotor 32 can be sufficiently secured. Therefore, the brake performance of the disc brake device can be maintained satisfactorily.

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

Further, in the present embodiment, a pair of knuckle flange portions 30B, 3B, 3B are provided integrally with the knuckle 30 and connected to the caliper mounting bracket 48.
Since the notch 58 described above is provided between the 0C portions, it is possible to minimize the influence of a 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 58. Therefore, the rigidity of this portion is increased, and the pair of knuckle flange portions 30 having the increased 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 formation of the notch on the aforementioned bearing creep performance and the like.

Further, as described above, in this embodiment, it is not necessary to increase the diameter of the flange portion 14B of the axle hub 14, so that the weight of the axle hub 14 and the like can be reduced. Therefore, it is possible to reduce the unsprung load, which is advantageous in vehicle performance. Further, in the conventional structure, as shown in FIG. 5, a method of increasing the diameter of the flange portion 104B of the axle hub 104 is adopted in order to allow the hub bolt 108 to be removed. Of increasing the offset amount A between the end face 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 longer, and the axle hub 1
Although the rigidity of the vehicle 04 decreases, the vehicle operation stability may also decrease. However, according to the present embodiment, the offset amount between the flange portion 14B of the axle hub 14 and the bearing 24 can be shortened, so that there is an advantage that such a disadvantage is not caused.

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

In this embodiment, the axle hub 14
The invention has been described with respect to an axle structure in which the axle hub 14 and the disk rotor 32 are integrally formed. May be applied.

[0030]

As described above, in the axle structure according to the first aspect of the present invention, the notch is provided on the outer peripheral portion of the knuckle on the flange side of the axle hub to avoid interference with the removal locus of the hub bolt. Therefore, the hub bolt can be removed by using 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 second aspect of the present invention, in the invention according to the first aspect, the notch portion is provided on at least one of the vehicle front side and the vehicle rear side in the outer peripheral portion of the knuckle. This has an excellent effect that the influence of a local decrease in rigidity on bearing creep performance and the like can be considerably suppressed.

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

[Brief description of the drawings]

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

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

FIG. 3 is a cross-sectional view of a main part showing a state where a hub bolt is removed using the cutout shown in FIG. 1;

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

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

[Explanation of symbols]

 DESCRIPTION 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

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B60B 3/16 B60B 27/00 B60B 35/00 B62D 7/18

Claims (3)

(57) [Claims] An axle for fixing a disk wheel to a flange portion of an axle hub with a bolt insertion hole provided in a flange portion of an axle hub supported on a knuckle via a bearing, and a hub bolt inserted from the knuckle side into the bolt insertion hole. An axle structure, comprising: a notch provided on an outer peripheral portion of a knuckle on a flange portion side of an axle hub to avoid interference with a removal locus of a hub bolt. 2. The axle structure according to claim 1, wherein 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. 3. The axle structure according to claim 2, wherein the notch is provided between a pair of knuckle flanges provided integrally with the knuckle and connected to a caliper mounting bracket.