JPH086569Y2 - Axle bearing seal structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a seal structure of a bearing inserted between an axle that rotates integrally with a wheel and a knuckle that covers the axle.

[Conventional technology]

As a conventional technique of this type, for example, there is one shown in FIG. 4, which is a partially cutaway front view in the vicinity of an axle of a vehicle.

That is, the axle 1 that rotates integrally with the wheels (not shown)
This axle 1 has a knuckle 3 through a hub 2.
And a bearing 4 is interposed between the outer circumference of the hub 2 and the inner circumference of the knuckle 3. The rotational force of a drive shaft (not shown) can be transmitted to the axle 1 via the constant velocity joint 5, and when the axle 1 rotates, the rotational force is transmitted to the wheels via the hub 2 and the like. ing.

Further, between the axle 1 and the constant velocity joint 5, a large number of irregularities are formed at equal intervals on the peripheral surface in a portion that rotates integrally with the axle 1, and a known rotation speed sensor that detects the rotation speed of the wheel. The sensor rotor 6 is fixed.

In the vicinity of the bearing 4, the bearing 4
The contact seals 4a, 4b and the non-contact seal 4c for protecting the pebbles and water from the non-contact seal 4c are provided.
It has a thin cylindrical shape with a step, the small diameter portion is fixed to the inner peripheral portion of the knuckle 3, and the large diameter portion covers the vehicle body inner side portion of the axle 1 with a slight gap.

[Problems to be solved by the device]

However, in the above-mentioned conventional technique, since the non-contact seal 4c and the sensor rotor 6 are arranged at different positions, the degree of freedom of layout in the vicinity of the axle 1 is small,
In addition, as a result, the number of parts is large and the assembling work becomes complicated. Further, since there is no member for protecting the sensor rotor 6, the sensor rotor 6 is directly exposed to water or the like, and its surface is easily rusted. There was a problem.

The present invention has been made in view of the unsolved problems of the above-mentioned prior art, and provides an axle bearing seal structure capable of increasing the degree of freedom of layout near the axle and protecting the sensor rotor from the external environment. The purpose is to

[Means for solving the problem]

In order to achieve the above object, the present invention is a seal structure of a bearing inserted between an axle that rotates integrally with a wheel and a knuckle that covers the axle, and that is closer to the vehicle body center side than the bearing. , While rotating integrally with the axle and fixing a ring-shaped member continuous in the circumferential direction on the outer periphery of a portion whose entire circumference is covered with the knuckle,
A sensor rotor having irregularities on its peripheral surface was fixed to the bearing side of this ring-shaped member, and a sensor was embedded in the knuckle so as to face the peripheral surface of the sensor rotor.

[Action]

The ring-shaped member fixed closer to the center of the vehicle body than the bearing serves as a conventional non-contact seal, which makes it difficult for pebbles, water, and the like to enter the bearing from the outside. Further, since the sensor rotor is arranged inside the ring-shaped member and at the position where the entire circumference is covered with the knuckle, it is possible to prevent water or the like from directly splashing on the surface of the sensor rotor. Then, the rotation speed of the sensor rotor is detected based on the output signal of the sensor embedded in the knuckle.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

1 and 2 show a first embodiment of the present invention.

First, the configuration will be described. In FIG. 1, reference numeral 1 denotes an axle, and the axle 1 includes a shaft portion 1a having a spline formed on a peripheral surface thereof, a bolt portion 1b integrally formed at a right end of FIG. 1 of the shaft portion 1a, and a shaft. Large diameter portion 1c formed on the other end of the portion 1a
The exterior portion 5a for outputting the rotational force of the constant velocity joint 5 described later is coupled to the left side of the large diameter portion 1c. Then, the shaft portion 1a is splined to the hole of the hub 2 and the bolt portion 1b is fastened with a nut so that the large diameter portion 1c abuts on the end surface of the hub 2, whereby the axle 1 and the hub 2
Are integrated in the rotational and axial directions.

The outer periphery of the hub 2 is covered with a knuckle 3 via a bearing 4, and an upper portion and a lower portion (not shown) of the knuckle 3 are connected to a vehicle body via an upper arm and a lower arm, respectively.

In addition, the flange portion 2a of the hub 2 has a plurality of hub bolts.
The disc 7 of the disc brake is fixed by 2b, and further to the right side of FIG. 1 of this disc 7, a rim (not shown) for supporting a wheel is integrally formed with the hub 2 and the disc 7 by the hub bolt 2b. It is fixed.

A plate 3a is fixed on the disc 7 side of the knuckle 3 to prevent the scraps of the disc brake scraped by the disc 7 from entering between the knuckle 3 and the hub 2, and the center side of the plate 3a is fixed. On the disk 7
The cylindrical portion 3b is formed so as to be close to the inner peripheral surface of the.

On the other hand, a drive shaft 8 is connected to the left end of FIG. 1 of the axle 1 through a constant velocity joint 5,
The rotational force of the drive shaft 8 is converted into a rotational force coaxial with the axle 1 by the constant velocity joint 5 and transmitted to the axle 1, and the rotational force of the axle 1 is further transmitted to the wheel (via a hub 2 and a rim (not shown)). (Not shown).

Further, the bearing 4 on the right side in FIG. 1 (outside the vehicle)
Is provided with a rubber contact seal 4a having an outer peripheral portion in contact with the knuckle 3 and an inner peripheral portion in contact with the hub 2;
On the left side (inside the vehicle) of the figure, a rubber contact seal 4b is provided, the outer peripheral portion of which is in contact with the knuckle 3 and the inner peripheral portion of which is in contact with the large diameter portion 1c of the axle 1.

The sensor rotor 10 is fixed coaxially with the axle 1 at the outer peripheral portion of the exterior portion 5a of the constant velocity joint 5 at a position where the entire periphery of the vehicle body center side of the contact seal 4b is covered with the knuckle 3. . As shown in FIG. 2 which is an enlarged perspective view of the sensor rotor 10, a large number of irregularities 10a at equal intervals are formed on the outer peripheral surface, and the sensor rotor 10 is embedded in the knuckle 3 so as to face the irregularities 10a. The sensor electromagnetically senses the proximity of the irregularities 10a when the wheel rotates, and outputs a pulse signal having a frequency proportional to the rotational speed of the wheel, and detects the rotational speed of the wheel based on this pulse signal. The anti-skid control is executed based on the rotation speed of the wheels.

Further, a thin ring-shaped member 11 is fixed to the inside of the vehicle body with respect to the unevenness 10a of the sensor rotor 10, and a slight gap 12 is provided between the outer peripheral surface of the ring-shaped member 11 and the knuckle 3. Are in a non-contact state.

 Next, the operation of the above embodiment will be described.

Since the bearing 4 is in a state of being shielded from the outside by the contact seals 4a and 4b, water etc.
The contact seal 4a is protected by the plate 3a and the cylindrical portion 3b, so that there is no possibility that pebbles or the like will fly in from the outside and be damaged, so the durability is improved. To do.

On the other hand, the contact seal 4b includes the knuckle 3 and the ring-shaped member 11
Since they communicate with the outside only through a small gap 12 between them and the like, like the contact seal 4a, there is no possibility that pebbles or the like will fly in and be damaged, thus improving the durability. That is, the ring-shaped member 11 plays the role of the non-contact seal of the conventional example.

Since the sensor rotor 10 is protected by the ring-shaped member 11 and the knuckle 3, there is no possibility of direct splashing of water or collision of small stones.
The surface of the is hardly rusted or the teeth of the unevenness 10a are not chipped, so that its durability is improved.

Further, since the sensor rotor 10 and the conventional ring-shaped member 11 which plays the role of a non-contact seal are arranged at one place, the configuration between the axle 1 and the drive shaft 8 becomes compact, and the degree of freedom of layout during this period is increased. Grows larger.

FIG. 3 is a sensor rotor according to a second embodiment of the present invention.
FIG. 11 is a perspective view of 10.

That is, in this embodiment, the sensor rotor 10 and the ring-shaped member 11 are integrally molded from the same member. The other structure is the same as that of the first embodiment.

When the sensor rotor 10 and the ring-shaped member 11 are integrally molded in this way, the strength of the sensor rotor 10 is increased and tooth breakage is less likely to occur, and the number of parts is reduced, which facilitates the mounting work.

In addition, in the above embodiment, the case where the present invention is applied to the axle of the drive wheel including the drive shaft has been described, but the present invention is not limited to this, and may be applied to the axle of the driven wheel that does not include the drive shaft. it can.

[Effect of device]

As described above, the axle bearing seal structure of the present invention rotates integrally with the axle and covers the entire knuckle on the vehicle body center side of the bearing interposed between the axle and the knuckle. A ring-shaped member that is continuous in the circumferential direction is fixed to the outer periphery of the broken portion, and a sensor rotor having irregularities on the peripheral surface is fixed to the bearing side of the ring-shaped member, and the sensor rotor of the sensor rotor is further provided inside the knuckle. Since the sensor is embedded so as to face the peripheral surface, the ring-shaped member plays a role of a non-contact seal and thus does not impair the durability of the bearing or the like, and the ring-shaped member and the sensor rotor can be arranged at one place. The structure near the axle can be made compact and the degree of freedom in layout is increased, and the number of parts is also reduced, so mounting work is easy. That we, furthermore, the various effects can be obtained that since the sensor rotor is also protected by the knuckle and the ring-shaped member is improved durability.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing an overall view of a first embodiment of the present invention, FIG. 2 is a perspective view of a ring-shaped member and a sensor rotor of the first embodiment, and FIG. 3 is a second embodiment. FIG. 4 is a perspective view showing a ring-shaped member and a sensor rotor, and FIG. 1 ... Axle, 2 ... Hub, 3 ... Knuckle, 4 ... Bearing, 4a, 4b ... Contact seal, 5 ... Constant velocity joint, 7 ... Disk, 8 ... Drive shaft, 10 ... Sensor rotor, 10
a ... unevenness, 11 ... ring-shaped member.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-62-242130 (JP, A) Japanese Patent Application No. 59-38620 (Japanese Utility Model Application No. 60-150104) A microfilm (JP, U) of which the contents were photographed (JP, U) A microfilm (JP, U) of which the description and drawings attached to the application for Japanese Utility Model No. 61-83561 (Japanese Utility Model No. 62-195772) were photographed

Claims (1)

[Scope of utility model registration request] 1. A seal structure of a bearing interposed between an axle that rotates integrally with a wheel and a knuckle that covers the axle, wherein the axle rotates integrally with the axle on the vehicle body center side of the bearing. And, while fixing the ring-shaped member continuous in the circumferential direction to the outer periphery of the region where the entire circumference is covered with the knuckle, and fixing the sensor rotor having unevenness on the peripheral surface on the bearing side of this ring-shaped member, Further, an axle bearing seal structure in which a sensor is embedded in the knuckle so as to face the peripheral surface of the sensor rotor.