JPS62297530A - Axle bearing device with pulser - Google Patents

Abstract

PURPOSE:To prevent the recess and projection section of a pulser from blinding and a captioned device from malfunctioning for a smooth rotation by providing seals on both axial sides of a pulser fitting section and a rolling element arranging section respectively, by forming two closed spaces, and by filling lubricant only into a rolling element arranging space. CONSTITUTION:Seals 13 are provided on both axial sides of the wheel bearing 3 of a double row ball bearing to form a closed rolling element arranging space B with inner and outer rings 9 and 10 to be filled with lubricant grease, and a pulser 7 is also provided on the extention section 14 of the inner ring 9. And a seal 5 is fitted to the inner peripheral section of the suspension section 4 on the axial outside of the wheel bearing 3 forming a closed space A by a seal lip 5a and the outer periphery of the shaft section of a hub 2. A sensor 6 for detecting revolving speed is formed by the proximity switch 8 mounted on the suspension section 4 and the pulser 7. Since the recess and projection section of the pulser 7 is, therefore, prevented from blinding caused by rusty fragment, and lubricant is not stirred by the pulser 7, a smooth rotation without mulfanction can be obtained.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention (Field of Industrial Application) This invention is an axle bearing device with a pulser, that is, a rotation speed that detects the rotation speed of a wheel and enables anti-skid brake control i+111. The present invention relates to an axle bearing device equipped with a detection sensor.

(Prior art) An axle bearing equipped with this type of rotation speed detection sensor is commonly used, for example, in the hub unit of the axle on the front wheel side of front-wheel drive vehicles (front-engine, front-drive vehicles). There are things that have been done.

That is, the rotation speed detection sensor has a structure in which the pulsar is provided on the drive shaft side of the front wheel on the rotating side, and the proximity switch is provided on a part of the vehicle body on the stationary side facing the pulsar. The above-mentioned pulser is arranged in an axially outer portion of the wheel bearing in a state in which -1 is exposed to the outside. Further, as the above-mentioned pulser, for example, a magnetic material having concavo-convex portions in the shape of a spur gear is used, and as the above-mentioned proximity switch, for example, a coil wound around a magnetized iron core is used.

When the uneven portion of the pulser rotates in front of the proximity switch due to the rotation of the front wheel, a voltage is generated in the coil of the proximity switch each time the uneven portion is passed, due to electromagnetic induction.
The number of revolutions per minute (rotational speed) of the wheel is measured based on the generation cycle (pulse signal) of this induced voltage.

(Problems to be Solved by the Invention) However, such a structure has the following problems, and improvements have been desired.

(]) Since the pulser of the rotation speed detection sensor is exposed to the outside, rust, dirt, etc. from the external atmosphere may enter the part where the pulser is located and cause clogging between the protrusions on the uneven part of the pulser. There is a problem that the protrusions may be broken or broken by small stones or the like. This causes the sensor to malfunction, making it impossible to accurately measure the rotational speed.

(2) Therefore, it has been considered to arrange the pulser inside the bearing, but in this case, it is enclosed inside the bearing. There is a problem in that the pulser stirs the fI'/% grease, and the stirring resistance at this time is large, leading to an increase in the rotational torque of the bearing.

(Means for Solving the Problems) The present invention has been made in view of the above conventional problems, and the axle bearing device with a pulser of the present invention has a proximity switch attached to the vehicle body and a proximity switch attached to the wheel. The axle bearing device is equipped with a rotation speed detection sensor formed by a pulser and a pulsar, wherein seals are provided on both axial sides of the mounting part of the pulsar and on both axial sides of the arrangement part of the rolling elements. Two sealed spaces, a mounting space and a rolling element arrangement space, are formed, and a lubricant is sealed only in the rolling element arrangement space.

(Function) The rotational speed detection sensor includes a pulser attached to the wheel side, which is the rotating side, and a proximity switch, which is attached to the vehicle body side, which is the stationary side, facing the pulser. Thereby, the pulse from the pulser is detected by the proximity switch, and the number of rotations on the rotation side is measured.

The space in which the Pulsar is installed is a sealed space formed by a seal, and rust, dirt, pebbles, etc. (2 people) are effectively prevented from entering the Pulsar installation space from the external atmosphere.

Further, the space in which the rolling elements are arranged is a sealed space formed by a seal, and a lubricant is sealed only in this space, so that the lubricant does not leak into the pulser mounting space.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

The structure of an axle bearing device with a pulser according to the present invention is shown in FIG. 1, and the bearing device is specifically for a hub unit of a front wheel side axle portion of a front-wheel drive vehicle.
A hub 2 is fitted and fixed to the oBAH portion 1a of the drive shaft 1, and a front wheel (not shown) is attached to the hub 2, while the shaft portion 2a of the hub 2 is attached to a part of the vehicle body via a wheel bearing 3. It has a structure in which it is supported by a suspension part 4 which is attached to the suspension part 4.

A seal 5 is attached to the inner peripheral part of the suspension part 4 at the axially outer +111 (left side in FIG. 1) of the wheel bearing 3, and its seal lip 5a is in sliding contact with the outer peripheral surface of the shaft part 2a of the hub 2. Abutted on and above! ! , and a ring bearing 3 to form a sealed space A.

Further, the bearing device is equipped with a rotation speed detection sensor 6 for measuring the rotation speed of the front wheel, and the rotation speed detection sensor 6 is connected to the pulser 7 attached to the wheel example and the rotation speed detection sensor 6 attached to the vehicle body side. A proximity switch 8 is provided.

The wheel bearing 3 is an angular contact type double-row ball bearing, and as shown in FIG. The balls 11 are arranged in two rows so that the inner and outer rings 9, 10 can rotate relative to each other, and the contact angle of the balls 11 is set at a predetermined angle with respect to the axis of the bearing. Further, seals 13.13 are provided on both sides of the bearing 3 in the axial direction, and both seals 13.13 and the inner and outer rings 9
．． A sealed rolling element arrangement space B is formed by 10, and a wet grease as a mixture is sealed in the rolling element arrangement space.

The inner ring 9 is press-fitted and fixed to the shaft part 2a of the hub 2, and serves as a rotating side that rotates together with the front wheel (hub 2), while the outer ring 10 is press-fitted and fixed to the inner peripheral part of the suspension part 4. It is considered to be a fixed side.

The same axial side of the inner ring 9, that is, the axially outer side facing into the closed space A sealed by the seal 5, extends outward to form an extension 14, as shown in FIG. The outer diameter surface 14a of the outer ring 10 is positioned so as to protrude further axially outward than the corresponding axial side portion 15 of the outer ring 10. Further, the above-mentioned pulser 7 is provided on the outer diameter surface 14a of the extension portion 14.

The rotational speed detection sensor 6 is for detecting the rotational speed of the front wheels to enable anti-skin brake control, and as described above, includes the pulser 7 and the proximity switch 8 as main parts.

The pulsar 7 is an annular plate made of a magnetic material, and as shown in FIG. 3, a spur gear-shaped uneven portion 16 is provided on the outer periphery. The uneven portion 16 has a large number of protrusions 16a and recesses 16b each having a rectangular cross section and are alternately formed at equal intervals over the entire circumference. The pulsar 7 is fixed to the extension portion 14 of the inner ring 9 by press fitting or spot welding. Further, the shapes of the protrusion 16a and the recess 16b are not limited to the illustrated example, and can be modified in various ways as long as they have the same function.

The proximity switch 8 uses a coil wound around a magnetized iron core. As shown in FIG. 1, the proximity switch 8 is installed at a portion of the suspension portion 4 on the outer diameter side of the pulser 7 so as to face the uneven portion 6 of the pulser 7. 17 is a lead wire.

Therefore, in the axle bearing device with a pulsar configured as described above, the pulsar 7 provided on the inner ring 9 of the wheel bearing 3 on the wheel side (rotating side) is opposed to the pulsar 7 on the vehicle body side (fixed side). The suspension part 4 is provided with a proximity switch.

When the uneven portion 16 of the pulser 7 rotates in front of the proximity switch 8 as the front wheel (hub 2) rotates, a voltage is generated in the coil of the proximity switch 8 each time the uneven portion 16 passes. do.

The number of revolutions per minute (rotational speed) of the front wheels is measured based on the generation cycle (pulse signal) of this induced voltage, and anti-skid brake control is performed based on this measurement result.

In this case, the above-mentioned pulser 7 and proximity switch 8 are structured to be installed inside a sealed space (pulsar installation space) A formed between the wheel bearing 3 and the seal 5, so that the above-mentioned anti-skid brake control is performed. is performed with extremely high precision.

That is, the seal 13 of the wheel bearing 3 prevents the lubricating grease inside the wheel bearing 3 (rolling element arrangement space) B from leaking into the pulser 7, and the seal 5 prevents external dirt, water (rust, etc.) from leaking. ) etc. is prevented. Therefore, in particular, in the uneven portion 16 of the pulser 7, the concave portions 16b between the protrusions 16a do not become clogged due to the attachment of the lubricating grease or the intrusion of the rust, dirt, etc. This also prevents the protrusions 16a from breaking due to this. As a result, malfunction of the rotation speed detection sensor 6 is effectively prevented, and accurate measurement of the rotation speed of the front wheels can be stably performed on the seat.

Furthermore, as a result of preventing the lubricating grease inside the wheel bearing 3 from leaking, there is no resistance to agitation of the lubricating grease by the pulser 7, the rotational torque of the wheel bearing 3 is low, and smooth bearing rotation is ensured.

Although the above-mentioned embodiment is for a hub unit on the front wheel side axle of a front-wheel drive vehicle, the rotation speed detection sensor 6 is also attached to a hub unit on the rear wheel side axle (not shown). omission).

Further, the present invention is not limited to the above-described embodiments, and various design changes can be made. For example, in the illustrated example, the pulser 7 is attached to the extension part 14 of the inner ring 9,
Although it has a unit structure integrated with the wheel bearing 3 to reduce the installation space and cost as much as possible, it may be formed separately from the wheel bearing 3.

Further, in the illustrated example, the inner ring 9 is on the rotating side and the outer ring 10 is on the fixed side, but depending on the location and purpose, the configuration may be reversed, and the wheel bearing 3 is also double-row angular. In addition to ball bearings, other bearings such as double-row angular roller bearings and single-row angular contact ball bearings may be used depending on the general purpose and purpose.

Further, the rotation speed detection sensor 6 including the pulser 7 can also have other conventionally known configurations.

Furthermore, the present invention can be applied to parts other than the hub unit of the axle of a front-wheel-drive vehicle having a similar structure.

(Effects of the Invention) As detailed above, according to the present invention, various excellent effects as listed below can be obtained, and anti-skin brake control can be performed by detecting the rotation speed of the wheel. This is extremely advantageous as an axle bearing device applied to a location where a rotational speed detection sensor is mounted.

(1) Since the space where the pulser of the rotation speed detection sensor is installed is a sealed space formed by a seal, there is no penetration of rust, dirt, pebbles, etc. from the external atmosphere into this part, and therefore, This prevents clogging of the concavo-convex portions of the pulser or damage to the protrusions of the concavo-convex portions due to these. This effectively prevents the sensor from malfunctioning and allows accurate measurement of the rotational speed.

(2) The space in which the rolling elements are arranged is a sealed space formed by a seal, and since the lubricant is sealed only in this space, there is no leakage of the lubricant into the above-mentioned pulser installation space, and therefore, Clogging of the concavo-convex portion of the pulser is prevented, and malfunction of the sensor is also effectively prevented in this respect.

(3) Furthermore, since there is no leakage of lubricating grease into the pulsar installation space, there is no agitation of the lubricating grease by the pulsar (and the rotational torque of the bearing is minimized, ensuring smooth rotation).

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing an axle bearing device with a pulser which is an embodiment of the present invention, Fig. 2 is an enlarged longitudinal sectional view showing the bearing of the same device, and Fig. 3 is an arrow mark in Fig. 2. It is the same front view seen from the direction. 3... Wheel bearing, 5... Seal, 6... Rotation speed detection sensor, 7... Pulsar, 8... Proximity switch, 9... Inner ring, 10... Outer ring, 11... ··ball(
(Rolling element), 13...Seal, A...Pulser mounting space, B...Rolling element arrangement space Figure 1 Figure 2 Figure fR3

Claims (1)

[Claims] (1) An axle bearing device equipped with a rotation speed detection sensor formed by a proximity switch mounted on the vehicle body side and a pulser mounted on the wheel side, the arrangement of rolling elements on both sides in the axial direction of the mounting portion of the pulser. Seals are provided on both sides of the part in the axial direction to form two sealed spaces, a pulser mounting space and a rolling element arrangement space, and a lubricant is sealed only in the rolling element arrangement space. Axle bearing device with pulser.