JP2002174326A - Differential limiting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a differential limiting device capable of constituting a pump without necessitating any particular parts, and installing the pump in the device in a compact manner. SOLUTION: In the differential limiting device limiting differential operations of differential members 1, 5 mutually and relatively rotating by pressing a multiple disc clutch 7 comprised of clutch plates 7B, 7A rotating together with respective differential members 1, 5 by a force in the axial direction, the gear pump is constituted by at least a pair of gears 5A, 14 meshing and rotating by the differential operation of the differential members 1, 5 and is stored in a casing 1 to utilize the constituent parts of the differential limiting device as the gear of the gear pump and install the pump in the device in a compact manner without necessitating any particular parts constituting the pump.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention limits the differential movement of a differential member by pressing a multi-plate clutch composed of a clutch plate rotating together with each of the differential members rotating relative to each other by an axial force. The present invention relates to a differential limiting device.

[0002]

2. Description of the Related Art A differential disc which limits the differential of said differential member by pressing a multi-plate clutch composed of a clutch plate which rotates together with each of the differential members rotating relative to each other by an axial force. In the limiting device, it is necessary to constantly supply lubricating oil in order to prevent abrasion due to pressure contact of each clutch plate in the multi-plate clutch. Such a differential limiting device employs a hermetically sealed coupling form in which lubricating oil is sealed, and employs a natural circulation method in which scattering occurs due to centrifugal force accompanying rotation of each member and the weight of the lubricating oil.
For example, there is an electronic control coupling in which a main clutch is connected by an electromagnetic control clutch introduced in "Gaia New Model Manual" published by the service department of Toyota Motor Corporation shown in FIG. When the electromagnetic solenoid 29 is energized by a command from an ECU (not shown) in a state where the driving force is transmitted from the front housing 24 which is an input shaft, the armature 30 is attracted to the electromagnetic control clutch. 28 is tightened and the ball 32
The main clutch 27 is engaged in a magnitude proportional to the exciting force by the thrust force generated by the relative rotation between the control cam 31 and the main cam 33 via the shaft, and is output as a driving torque to the rear differential through the shaft 25.

[0003] In such an electronic control coupling, lubricating oil is sealed to lubricate each clutch, cam mechanism, bearing and the like constituting a power transmission mechanism which is a coupling. Normally, lubricating oil is supplied through oil supply / discharge ports 34 (two pairs are provided, one is used as an oil supply port and the other is used as an exhaust port for venting air) formed in a side wall or the like of the front housing 24. The lubricating oil is supplied and press-fitted with a plug 35 such as a ball to seal the lubricating oil. As described above, the lubricating oil sealed in the casing is scattered and lubricated by centrifugal force accompanying rotation of each member. The lubricating oil is circulated by a natural circulation system in which the oil returns to the vicinity of the rotating shaft by its own weight.

[0004]

However, in such a conventional hermetic coupling, particularly when it is mounted on a vehicle and used as a differential limiting device for a power transmission system, a relative component constituting the device is used. Since the rotating member rotates at high speed, lubrication by the natural circulation method described above may not be able to return to the vicinity of the rotating shaft due to the own weight of the lubricating oil in time, leading to a shortage of lubricating oil and a decrease in durability of the clutch plate. was there. For this reason, a pump having a pump installed for forced circulation of the lubricating oil has been proposed. However, such a pump requires a space for installation and increases the cost.

[0005] Therefore, the present invention solves the above-mentioned problems of the conventional differential limiting device, and allows the pump to be configured without requiring special parts, and allows the pump to be installed compactly in the device. It is intended to provide a motion limiting device.

[0006]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a multi-disc clutch comprising a clutch plate which rotates together with each of differential members which rotate relative to each other by an axial force. In the differential limiting device, a gear pump is constituted by at least a pair of gears which mesh and rotate by the differential of the differential member, and the gear pump is housed in a casing. Further, the present invention is characterized in that the gear pump is configured to forcibly circulate the lubricating oil from the outer peripheral side to the inner peripheral side. Further, the present invention is characterized in that the gear pump is disposed between a multi-plate clutch and a side surface of a casing, and these are used as means for solving the problems.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a differential limiting device according to an embodiment of the present invention. FIG. 1 is an overall sectional view showing an embodiment of a differential limiting apparatus according to the present invention, and FIG.
It is -A sectional drawing. The present invention provides a clutch plate 7 which rotates together with each of the differential members 1 and 5 which rotate relative to each other.
In a differential limiting device that limits the differential between the differential members 1 and 5 by pressing the multi-plate clutch 7 composed of B and 7A by an axial force, the differential members 1 and 5 are engaged and rotated by the differential. A gear pump is constituted by at least a pair of gears 5A and 14 and the gear pump is housed in the casing 1.

This embodiment is an example in which the present invention is applied to an electromagnetic type differential limiting device, and is integrated with an input shaft 4 in a state where a rotational driving force from a transfer (not shown) is transmitted to the input shaft 4. The casing 1 and the rotor 2 rotate. When the armature 10 is attracted by exciting the electromagnet 9 installed on the stator 3 fixed to the stationary portion of the vehicle body and located in the rotating rotor 2, the inner side of the pilot clutch 8 rotating together with the cam ring 11 in the floating state is attracted. The plate group and the outer plate group of the pilot clutch that rotates together with the casing 1 come into contact with and rotate with a predetermined frictional force in accordance with the exciting force of the electromagnet 9.

Accordingly, the thrust force is generated by the cam action by the relative rotation between the cam ring 11 that is braked by the predetermined frictional force and the cam plate 13 that is lug-engaged with the output shaft 5 via the cam ball 12. appear. Due to the thrust force, the main clutch 7 that engages with the lug 1C on the inner periphery of the casing 1B integral with the input shaft 4 and rotates together.
And the inner plates 7A of the main clutch 7, which engage with the lugs (gear teeth) 5A on the outer periphery of the output shaft 5 and rotate together, come into contact with each other with an amplified predetermined frictional force. A predetermined drive torque is differentially distributed and transmitted to the output shaft 5 to a rear differential (not shown). In FIG. 1, reference numeral 17 denotes a bearing provided between the output shaft 5 and the casing 1, and reference numeral 16 denotes a bearing.
Denotes a bearing provided between the rotor 2 and the stator 3 integrated with the casing 1.

In the hermetic type differential limiting device of the present embodiment, at least one pair of gears 5A and 14 meshed and rotated by the differential between the casing 1 integrated with the input shaft 4 and the output shaft 5 as a differential member. A gear pump is formed and the gear pump is housed in a casing 1. As clearly shown in FIG. 2, which is an AA cross section of FIG.
A pair of meshing gears constituting the gear pump are formed with gears by engraving gear teeth 5A (also lugs for locking the inner lugs of the inner plate 7A in the multi-plate clutch 7) on the outer periphery. The output shaft 5 itself constitutes one gear 5A, and is housed and supported by a pocket 19 recessed in the gear pump housing 6 on the inner surface of the casing 1A.
The gear 14 having the teeth 14A meshing with A constitutes the other gear.

As shown in the figure, a gear 15 may be provided at a symmetric position in addition to the gear 14. Further, gears that mesh with the gears 14 and 15 may be added and combined. The gear pump constituted by these gears is configured so that the lubricating oil is forcibly circulated from the outer peripheral side to the inner peripheral side. That is, the lubricating oil is forcibly supplied from the outer peripheral side of the casing 1 to the output shaft 5 side, which is the inner peripheral side, by the pumping operation in the main rotation direction of the gear pump. As a pair of gears constituting the gear pump, teeth 1C (which are also lugs for engaging the outer peripheral lug of the outer plate 7A in the multi-plate clutch 7) formed on the inner periphery of the casing 1B are one of the gears. The other gear can be formed by meshing the gear 1C supported in a pocket recessed in a disk-shaped member integrally formed with the output shaft 5 with the teeth 1C. Further, only the portion forming the gear pump portion in the teeth 5A of the output shaft 5 or the lug 1C of the casing 1B is formed as a helical tooth, so that the lubricating oil by the gear pump is not only provided on the inner peripheral side, but also in the axial direction. It can also be forced to flow to the side.

With this configuration, the components of the differential limiter can be used as gears of the gear pump.
The pump can be installed in the apparatus to make it compact without requiring any special parts constituting the pump, and scattered around the outer peripheral side of the casing 1 due to centrifugal force due to the rotation of the apparatus. The lubricating oil that is
When a relative rotation, that is, a differential occurs between the input shaft 4 and the output shaft 5, a gear formed on the output shaft 5 itself and the casing 1 are formed.
The lubricating oil is forcibly recirculated to the inner peripheral side as shown by arrow 18 in FIG. 1 by the pumping action due to the meshing rotation between the gears accommodated in the side surfaces of the gears, and passes through a large number of holes formed in each plate. It also flows in the axial direction, effectively lubricating the friction surface when the plates of the multi-plate clutch 7 are pressed against each other when the differential limiting operation is performed, and does not cause a decrease in the durability of the clutch plate.

Although the embodiment of the present invention has been described above, the type, shape, and type of the differential limiting device as the hermetically-coupled coupling (independent of the electromagnetic piston clutch) are within the scope of the present invention. About the shape of the gear pump including the shape of the casing, the shape of the input shaft and the output shaft and their related configurations, the number of gears, the type, including the number and type of gears, the type and the arrangement position, etc. Can be selected as appropriate.

[0014]

As described above in detail, according to the present invention, a multi-plate clutch composed of a clutch plate that rotates together with each of the differential members that rotate relative to each other is pressed by an axial force so as to make the differential. In a differential limiting device for limiting the differential of a moving member, a gear pump is constituted by at least a pair of gears which mesh and rotate by the differential of the differential member, and the gear pump is housed in a casing, thereby limiting the differential. The components of the device can be used as the gears of the gear pump, and the pump can be installed in the device and made compact without the need for special components that make up the pump.

Further, the lubricating oil is forcibly circulated from the outer peripheral side to the inner peripheral side by the gear pump, so that the lubricating oil scattered and retained on the outer peripheral side by centrifugal force due to the rotation of the apparatus can be removed. Due to the operation of the gear pump, the fluid is forcibly recirculated to the inner peripheral side to effectively lubricate the friction surface when the plates of the multi-plate clutch are pressed against each other, so that the durability of the clutch plate is not reduced. Further, when the gear pump is disposed between the multi-plate clutch and the casing side, the gear pump can be easily assembled and constructed simply by forming a pocket on the casing side and disposing the gear. Can be used as a pressure side wall of the pump. Thus, according to the present invention, there is provided a differential limiting device capable of configuring a pump without requiring special parts and installing the pump compactly in the device.

[Brief description of the drawings]

FIG. 1 is an overall sectional view showing one embodiment of a differential limiting device according to the present invention.

FIG. 2 is a sectional view taken along the line AA in FIG.

FIG. 3 is an overall sectional view showing a conventional hermetic coupling.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Casing 1A Left casing 1B Right casing 1C Inner lug 2 Rotor 3 Stator 4 Input shaft 5 Output shaft 5A Output shaft lug 6 Gear pump housing 7 Multi-plate clutch 7A Inner plate 7B Outer plate 8 Pilot clutch 9 Electromagnet 10 Armature 11 Cam ring 12 Cam ball 13 Cam plate 14 First gear 15 Second gear 16 First bearing 17 Second bearing 18 Lubricating oil flow 19 Pocket

Claims (3)

[Claims] 1. A differential limiting device for limiting a differential of a differential member by pressing a multi-plate clutch composed of a clutch plate rotating together with each of differential members rotating relative to each other by an axial force, A differential limiting device, wherein a gear pump is constituted by at least a pair of gears that mesh and rotate by the differential of the differential member, and the gear pump is housed in a casing. 2. The differential limiting device according to claim 1, wherein the gear pump is configured to forcibly circulate the lubricating oil from an outer peripheral side to an inner peripheral side. 3. The differential limiting device according to claim 1, wherein the gear pump is disposed between a multi-plate clutch and a side surface of the casing.