JPH0541054Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a vehicle axle speed detection device for detecting the respective rotational speeds of two axles that are differentially controlled by a differential device.

[Description of Prior Art] Conventionally, for differential limiting control, etc.
When detecting the respective rotational speeds of two wheels that are differentially controlled by a differential device, for example, Japanese Patent Laid-Open No. 61
- As shown in Publication No. 67631, a rotational speed sensor is provided on each of one and the other axle or wheel to be differentially controlled, and the rotational speed of each axle or wheel is detected. It was configured to recognize the rotational speed of each wheel.

[Problem to be solved by the invention] In such conventional technology, since a rotational speed sensor is disposed on each of two axles or wheels that are differentially controlled, the rotational speed sensors are distributed at two locations separated from each other. Therefore, it is necessary to prepare space for installing the rotational speed sensor in two locations, and the wiring for each rotational speed sensor must be routed separately. There were problems such as troublesome maintenance due to the sensors being dispersed.

This invention was made based on the above viewpoint,
The purpose is to provide a vehicle axle speed detection device in which rotational speed sensors can be disposed at one location without being dispersed.

[Means for Solving the Problems] The present invention provides a device for detecting the respective rotational speeds of one and the other axle that are differentially controlled by a differential device, a first rotation speed sensor that detects a rotation speed; and a second rotation speed sensor that detects a rotation speed of a differential gear case of the differential device; The above object is achieved by vehicle axle speed detection devices disposed adjacent to each other on the one axle side.

[Function] The first rotational speed sensor and the second rotational speed sensor are arranged adjacent to each other on one axle side, and the first rotational speed sensor and the second rotational speed sensor are distributed. It is designed so that it can be installed in one place without any problems.

[Embodiment of the invention] The accompanying drawing is a configuration diagram showing an embodiment of the invention.

In the figure, reference numeral 1 denotes a differential device, and a differential mechanism 4 including a differential gear case 3 is housed in an external case 2 that does not rotate. The differential gear case 3 is rotatably supported at its ear portions 5 and 6 by the outer case 2 via bearing mechanisms 7 and 8. A ring gear 1 is attached to the flange portion 9 of the differential gear case 3.
0 is fixed, and driving force is applied to the differential device 1 through engagement between the ring gear 10 and the pinion gear 12 of the drive shaft 11.
Axles 13 and 14, which are differentially controlled by the differential mechanism 4, protrude from the ear parts 5 and 6 of the differential gear case 3, and drive wheels (not shown) are coupled to these axles 13 and 14, respectively. ing. If the load on one axle 13 and the load on the other axle 14 are equal, both will rotate at the same speed as the differential gear case 3, and there will be a difference between the load on one axle 13 and the load on the other axle 14. If this occurs, both axles rotate differentially according to the difference. That is, if the rotational speed of the differential gear case 3 is N _H , the rotational speed of one axle 13 is N _R , and the rotational speed of the other axle 14 is N _L , then N _H = ( _NR + N _L )/2. There is a relationship. Therefore, by detecting the rotational speed N _H of the differential gear case 3 and the rotational speed N _R or N _L of one of the axles 13 or 14, the rotational speed N L or N _L of the axle 14 or 13 that is not detected is detected.
N _R can be found.

15 is a first rotational speed sensor that detects the rotational speed N _R of one axle 13; 16 is a second rotational speed sensor that detects the rotational speed N _H of the differential gear case 3; It is composed of pulsar 15b and 16b, and pulsar 15
The electromagnetic pickups 15a and 16a generate a detection signal every time b and 16b rotate by a predetermined angle. The first rotational speed sensor 15 is connected to the axle shaft 13 in the vicinity of one of the breech parts 5 of the differential gear case 3.
An electromagnetic pickup 15a is fixed to the outer case 2 so as to detect the rotational speed N _R of the pulser 1.
5b is fixed to the axle 13. The second rotational speed sensor 16 is configured to detect the rotational speed N _H of the differential gear case 3 at a position adjacent to the first rotational speed sensor 15 on one of the breech portions 5 of the differential gear case 3. An electromagnetic pickup 16a is fixed to the outer case 2, and a pulser 16b is fixed to the gun ear 5. Furthermore, first and second rotational speed sensors 1
5 and 16 are provided inside the external case 2,
It is designed to be protected from stones, sand, water, etc.
The detection signal of the first rotational speed sensor 15 is F/V
The signal is applied to the converter 17, where it is waveform-shaped and converted into a voltage level, and the rotational speed of one axle 13 N _R
It is input to the calculator 19 as a rotational speed N _R of one axle 13 . The detection signal of the second rotational speed sensor 16 is given to the F/V converter 18 and converted into a voltage level after being waveform-shaped and inputted to the calculator 19 as the rotational speed N _H of the differential gear case 3. Ru. The calculator 19 calculates the rotational speed N _L of the other axle 14 from 2N _H -N _R =N _L and outputs this.

According to the above configuration, the first rotational speed sensor 15
and the second rotational speed sensor 16 are connected to one axle 13.
Since the first and second rotational speed sensors 15, 16 are arranged adjacent to each other on the sides and are provided in the outer case 2 of the differential gear 1, stones, sand, water, etc. can damage the rotational speed sensors. Damage and malfunctions are prevented.

In the above embodiment, electromagnetic pickups are used as the first and second rotational speed sensors, but it is of course possible to use other well-known sensors capable of detecting rotational speed, such as optical sensors and magnetic sensors. . Furthermore, although two single pickups are used in the above embodiment, an integrated two-sensor pickup in which two pickups are integrated may be used, which contributes to space saving. Further, in the above embodiment, the rotational speed of one axle 13 and differential gear case 3 is detected, but the rotational speed of the other axle 14 and differential gear case 3 may also be detected. Of course it's a good thing.

[Effects of the invention] As explained above, according to the invention, the first rotational speed sensor detects the rotational speed of one axle and the second rotational speed sensor detects the rotational speed of the differential gear case. Since they are arranged adjacent to each other on the one axle side, the rotational speed sensors can be arranged in one place without being distributed, and there is no need to prepare multiple spaces for installing the rotational speed sensors. , it is possible to provide a vehicle axle speed detection device that allows the wiring of each rotational speed sensor to be routed together and also contributes to ease of maintenance.

[Brief explanation of the drawing]

The accompanying drawings are block diagrams showing one embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Differential device, 2... External case, 3... Differential gear case, 5, 6... Gun ear part, 13, 14...
...Axle, 15...First rotational speed sensor, 16...
...Second rotational speed sensor, 17, 18...F/V
Converter, 19... Arithmetic unit.

Claims (1)

[Scope of utility model registration request] A device for detecting the respective rotational speeds of one and the other axle that are differentially controlled by a differential device, the device comprising: a first rotational speed sensor that detects the rotational speed of the one axle; a second rotational speed sensor that detects the rotational speed of a differential gear case of the differential device, and the first and second rotational speed sensors are arranged adjacent to each other on the one axle side. Vehicle axle speed detection device.