JPH07167255A - Differential limiting device - Google Patents

Abstract

PURPOSE:To improve the differential limiting performance of a differential limiting device while avoiding the capacity increase of an outer differential case having been limited in improving the differential limiting performance in the limited capacity. CONSTITUTION:This differential limiting device is provided with an inner differential case 2 with a drive gear, outer clutch plates 3a, 3b supported on the inner differential case 2 side, and inner clutch plates 5a, 5b supported on side gear bosses of drive shafts 4a, 4b in an outer differential case 1. A sensor 6 is provided in the outer differential case 1, and the rotation of the inner differential case 2 side can be directly sensed to detect the revolving speed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a vehicle differential limiting device.

[0002]

2. Description of the Related Art An automobile has a diff differential between left and right driving wheels so that even when a difference in rotation occurs between the left and right driving wheels when turning, an appropriate rotation is transmitted right and left. hand,
You can turn without any trouble. However, in the case of a general diff differential installed in a general vehicle, for example, in an extreme case, when the right wheel gets muddy,
The load on the right wheel becomes zero, the wheel spins idle, and the left wheel does not rotate because it is under load. There are advantages and disadvantages in providing the differential differential device in this manner.

As a method of preventing such a difficulty due to the provision of the differential differential device, a differential lock device is provided so that the differential device of the differential gear does not work if it is locked by switching, and the left and right wheels are evenly distributed. It is known to transmit rotation and allow escape.

Further, in the case of a race car, a diff differential device with a diff differential limitation is provided so that the power can be distributed to the left and right drive wheels evenly even when turning in a small radius with a large left / right rotation difference. Has been adopted. In the case of a race car, the development of the race may be greatly affected by the performance of this differential differential limiting device, and thus the size of the differential case is larger than that of a general car.

A conventional example of the differential differential limiting device is shown in a sectional view of FIG. 5 and a sectional view taken along the line AA in FIG. Inner diff case 32 with drive gear 36 inside outer diff case 31
The left and right outer clutch plates 33a, 33b supported by the inner differential case 32 on the inner differential case 32 side, and the side gear bosses 37a, 37b of the left and right drive shafts 34a, 34b.
The inner clutch plates 35a and 35b supported by the gears are provided to limit the differential operation. Then, to detect the speed, move the speedometer drive gear to the inner differential case 32.
38, and further, a speedometer driven gear 39 is provided in the bulging portion provided in the outer differential case 31, and the speedometer driven gear 39 is meshed with the speedometer drive gear 38 so that its shaft
The magnetic field sensor 42 detects the rotation of the magnet 41 provided at the end of 40.

[0006]

According to such a conventional structure, the inner clutch plates 35a, 35b and the outer clutch plate 33 are provided to improve the differential limiting performance.
When the diameters of a and 33b are increased, the volume of the outer differential case 31 including the speedometer driven gear 39 and the like increases as the volume of the inner differential case 32 increases. Therefore, conventionally, there has been a limit in improving the differential limiting performance within a limited volume. The present invention has considered improving the differential limiting performance while avoiding an increase in the volume of the outer differential case 31.

[0007]

[Means for Solving the Problems] As a result of examining the above problems,
According to the present invention, an inner differential case 2 with a drive gear, an outer clutch plate 3 supported on the inner differential case 2 side, an inner clutch plate 5 supported by a boss 9 of a side gear 8 of a drive shaft 4 are provided in an outer differential case 1. In the differential differential limiting device having and, the sensor 6 is provided in the outer differential case 1, and the rotation speed can be detected by directly sensing the rotation on the inner differential case 2 side.

The sensor 6 of the outer differential case 1 referred to here is
A proximity sensor is preferable, for example, a high-frequency oscillation type sensor that stops oscillation by detecting impedance change of the oscillation coil in the high-frequency oscillation circuit for detection, or a magnetic flux due to an eddy current generated in a detection object is detected by the difference between the detection coil and the comparison coil. It uses a magnetic field, such as a differential coil type or a magnetic type that drives the reed switch using the attractive force of a permanent magnet, or an oscillation circuit that starts or stops oscillation in response to changes in capacitance. For example, a capacitance type for detecting. It should be noted that the sensor is a non-contact type, and does not exclude a sensor having an optical structure or using an electromagnetic wave without departing from the object of the present invention.

The detection point of the sensor is preferably set on the fixing bolt 7 existing on the inner differential case 2 side or on the uneven portion of the inner differential case. Directly sensing the rotation on the inner differential case 2 side means sensing (sensing) the movement of the inner differential case 2 or a fixing bolt or the like attached to the inner differential case 2 with almost no intervening mechanical structure. The present invention includes means for providing a protrusion or the like on the inner differential case 2 side in order to detect the rotation of the inner differential case 2 with a sensor, and providing various means on the inner differential case 2 side for enhancing the sensing ability of the sensor. Be done. The position where the sensor 6 of the outer differential case 1 is installed is not particularly limited as long as the rotation of the inner differential case 2 can be sensed.

[0010]

Since the sensor 6 is provided on the outer differential case 1 to directly detect the rotation of the inner differential case 2 to detect the rotational speed, the gears for the speedometer drive and the driven gear can be omitted. Become. Therefore, the diameter of the inner differential case 2 can be increased to be close to the inner diameter of the outer differential case 1, and accordingly, the effective contact diameter of the outer clutch plate 3 and the inner clutch plate 5 can be increased. As a result, the contact area of the clutch plate is expanded, and effective differential differential limiting can be performed, so that the differential limiting performance of the device can be improved and the turning performance can be improved.

Since it is possible to omit the speedometer drive and driven gears, the driven gear shaft, the bearings that hold the gears, and the like, it is possible to reduce the number of members and to prevent malfunctions due to wear of the gears and bearings. It becomes possible. In addition, the accuracy of speed measurement is also improved.

[0012]

【Example】

Embodiment 1 FIG. 1 is a sectional view showing the inside of the differential differential limiting device of the present invention. The drive gear 10 in which the propeller shaft that transmits the propulsive force from the engine through the transmission meshes,
It is provided on the outer periphery of an inner differential case 2 which is rotatably provided in the outer differential case 1. Through the inner differential case 2 and the outer differential case 1, there are left drive shaft 4a and right drive shaft 4b on both sides in a direction substantially perpendicular to the propeller shaft, respectively, and both have inner gear side gears 8a, 8b in the inner differential case 2. ing. In the center of the inner differential case 2,
Cross-shaped pinion shaft 11 with a cam surface at the tip 11
Is provided, and pinions 12a, 12b having inner bevel gears on both left and right sides are mounted therein.

Further, pressure rings 13a and 13b containing the side gears 8a and 8b and the pinions 12a and 12b are externally inserted to the bosses of the left and right side gears 8a and 8b, respectively, and the contact surfaces of the pinion 12a and 12b with the spherical rear surface are spherical. Has become. In addition, a concave cam surface that matches the cam surface 11a of the pinion shaft 11 is provided on the circumferential end surface. With such a structure, when the left and right drive shafts 4a, 4b have a rotational difference during traveling and turning, a differential is generated, and a force for rotating the pinion shaft 11 in a direction opposite to the rotational direction of the drive shaft is generated. The shaft 11 and the concave cam surface of the pressure ring ride up, and the left and right pressure rings 13a and 13b are moved left and right (outward).
It will be pressed against.

Between the pressure rings 13a, 13b and the inner wall of the inner differential case 2, the inner clutch plates 5a, 5b supported by the side gear bosses 9a, 9b of the drive shafts 4a, 4b from the pressure ring side and the drive gear are attached. Outer clutch plate supported on the inner differential case 2 side
3a and 3b are provided first, and then inner disc springs 14a and 14b and outer disc springs 15a and 15b are loosely fitted to the left and right side gears 9a and 9b bosses. The pressing force of the above-mentioned pressure rings 13a, 13b presses the respective clutch plates, and a kind of braking action is caused by friction, which makes it difficult for the left and right drive shafts 4a, 4b to have a rotational difference. As a result, the rotational force of the propeller shaft is evenly transmitted to the left and right wheels even when turning a small radius, and the turning drive force is improved. A description of this differential actuation limiting mechanism can be found in Japanese Patent Application No. 5-59308, which is a prior application.

In such a differential differential limiting device, comparing the one shown in FIG. 1 of the present invention with the conventional structure shown in FIG. 5, the effective contact diameters of the outer clutch plate and the inner clutch plate are compared. You can see that there is a big difference. Let d be the contact effective diameter of the conventional outer clutch plate and inner clutch plate shown in FIG. 5 and D be the contact effective diameter of the present invention.
<D relationship. This is possible because the sensor 6 is provided in the outer differential case 1 described below so that the rotation speed can be detected by directly sensing the rotation of the inner differential case 2.

That is, in the present invention, the sensor 6 is attached to the outer differential case 1 by providing a mounting hole so as to face the fixing bolt 7 fixing the drive gear 10 on the inner differential case 2 side. As the inner differential case 2 rotates, it is detected that the fixing bolt 7 has passed in front of the sensor 6, and the signal is displayed on the speedometer 30 via the signal converter 20. The sensor 6 is a proximity sensor that senses the passage of metal. The signal conversion device can also be used as a type incorporated in the sensor body.

Embodiment 2 FIG. 2 is a sectional view of the essential parts of the second embodiment. 3 is P in FIG.
FIG. In this example, the sensor 6 is mounted on the outer differential case 1 near the fixing bolt 7 fixing the drive gear 10 on the inner differential case 2 side, and the fixing bolt 7 is used to adjust the detection sensitivity of the fixing bolt 7. The drive gear 10 as well as the ring holding the detection metal section 16 are fixed by. Inner differential case 2 also in this example
It is designed to detect that the detection metal piece 16 passes in front of the sensor 6 in accordance with the rotation of, and display it on the speedometer through the signal conversion device.

Embodiment 3 FIG. 4 is a sectional view of a third embodiment of the present invention. In this example, the sensor 6 is provided almost in the middle of the outer differential case 1. The sensor 6 senses the convex portion 17 on the inner differential case 2.

The sensor 6 can be provided even in a portion where the inner differential case 2 is close to the inner wall of the outer differential case 1. In this case, the sensor may be one that senses a change in current value due to eddy current loss or a sensor type that senses a change in capacitor capacitance, and may detect passage through a recess provided in the inner differential case 2.

[0020]

With the above-described structure, the present invention can improve the accuracy of speed measurement and the performance of the differential differential limiting device. As a result, the turning performance of the vehicle is improved, and it becomes possible to turn like a sports type even when mounted on an ordinary vehicle.

Since it is possible to omit the speedometer drive and driven gears, the driven gear shaft, the bearings that hold the gears, and the like, it is possible to reduce the number of members and eliminate any troubles due to wear of each gear or bearing. . In addition, the contact area between the outer clutch plate and the inner clutch plate has increased, resulting in greater durability.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing the inside of a differential differential limiting device according to the present invention.

FIG. 2 is a cross-sectional view of essential parts of a second embodiment.

3 is an overall view of the vicinity of a fixing bolt as viewed in the direction of arrow P in FIG.

FIG. 4 is a sectional view of a third embodiment of the present invention.

FIG. 5 is a cross-sectional view showing the inside of a conventional differential differential limiting device.

6 is a cross-sectional view taken along the line AA in FIG.

[Explanation of symbols]

 1 Outer differential case 2 Inner differential case 3 Outer clutch plate 4 Drive shaft 5 Inner clutch plate 6 Sensor 7 Fixing bolt 8 Side gear 9 Boss 10 Drive gear

Claims (2)

[Claims] 1. An inner differential case 2 with a drive gear, an outer clutch plate 3 supported on the inner differential case 2 side, and an inner clutch supported by a boss 9 of a side gear 8 of a drive shaft 4 in an outer differential case 1. A differential differential limiting device having a plate 5, wherein a sensor 6 is provided on the outer differential case 1 to directly detect rotation of the inner differential case 2 and detect a rotational speed. 2. A differential differential limiting device, wherein the sensor 6 according to claim 1 is a proximity sensor, and a detection point by the sensor is a fixing bolt 7 or an uneven portion existing on the inner differential case 2 side.