JPH09166155A - Clutch device and constant speed running device using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the generation of noise due to collision during engagement and to improve durability of a clutch tooth by a method wherein the cover gear-form clutch teeth of a clutch device are brought into engagement between a metallic tooth and a resin tooth. SOLUTION: A function is provided to transmit and disconnect a power through shaft movement of one power transmission member 19 of power mission members 18 and 19 and transmission of a power is practicable through engagement between cover gear-form clutch teeth 180 and 190. The clutch tooth 180 forms a metallic tooth and the clutch tooth 190 forms a resin tooth. The generation of noise due to collision between clutch teeth during engagement is reduced through sound absorbing ability which the resin tooth 190 has and further, wear of the two clutch teeth 180 and 190 is reduced through self lubricity which the resin teeth 190 has, resulting improvement of durability.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clutch device and a constant speed traveling device using the clutch device.

[0002]

2. Description of the Related Art Conventionally, for example, a throttle valve opening is adjusted by engaging and disengaging an electromagnetic clutch and actuating a control member by forward / reverse rotation of a drive motor in response to a signal from a vehicle engine electronic control unit. As the high speed traveling device, there is an electric drive device disclosed in Japanese Patent Laid-Open No. 64-47628. In this electric drive device, the clutch device of the electromagnetic clutch is a friction clutch. In such a friction clutch, when it is attempted to reduce the diameter of the clutch disc, it is predicted that the transmission torque will be insufficient, which is an obstacle to downsizing of the constant speed traveling device. There is also a pin clutch as a clutch device, but it is structurally difficult to miniaturize, and because the contact area of the pin is small, the meshing part is likely to wear and wear powder generated by that wear accumulates in the meshing part and the clutch It may cause cutting failure. Further, the same problem as above is expected in other clutch devices.

From the above reasons, as a clutch device advantageous for downsizing of the constant speed traveling device, one of the drive side power transmitting member and the driven side power transmitting member provided on substantially the same axis is used. A clutch device having a function of transmitting and blocking power by axial movement of the transmission member, and capable of transmitting power by meshing of crown gear-shaped clutch teeth provided on opposite end surfaces of the both power transmission members. It is possible. In such an engagement type clutch device (also referred to as a crown gear engagement type) with crown gear-shaped clutch teeth, a metal material is mainly used for both power transmission members, mainly iron-based sintering in order to reduce machining and reduce cost. It is common to use metal.

[0004]

In the above-described crown gear meshing type clutch device, when both power transmission members are made of ferrous sintered metal, the clutch teeth are meshed with each other, so that when the clutch teeth are meshed with each other. Not only is the noise caused by the collision of the above, but also the clutch teeth are easily worn, and the durability remains a problem.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to solve the problem that the clutch teeth in the crown gear meshing type clutch device are formed of metal teeth and resin teeth. An object of the present invention is to provide a clutch device that can reduce noise due to collision at the time of meshing of clutch teeth and can improve durability of the clutch teeth, and a constant speed traveling device using the clutch device.

[0006]

[Means for Solving the Problems]
The invention of Item 1 is a driving-side power provided on substantially the same axis.
The power of either the transmission member or the driven power transmission member
Function to transmit and cut off power by axial movement of transmission member
And provided on opposite end surfaces of the power transmission members, respectively.
The power transmission is achieved by the meshing of the toothed clutch gear teeth.
A clutch device that enables the
Metal teeth, and the other mesh that meshes with the metal teeth.
With a clutch device characterized by using plastic teeth
is there. According to the clutch device of the first aspect, the clutch device
Since the teeth are the mesh of metal teeth and resin teeth,
Compared with the case of meshing of metal teeth, resin teeth have
Noise caused by collision of clutch teeth during meshing due to noise
Is reduced, and due to the self-lubricating property of resin teeth, both
Durability of the clutch teeth because less wear is required on the latch teeth
Is improved. The invention of claim 2 is the crack of claim 1.
H device, pressure angle θ of metal teeth _RAnd resin tooth pressure angle
θ_AAnd θ_R> Θ_AIt is characterized by setting to the relationship of
It is a clutch device. The clutch device according to claim 2.
According to the above, the metal teeth and the resin teeth come into line contact with each other.
Due to the meshing due to
Disengage the clutch compared to meshing by surface contact
Sometimes metal teeth and resin teeth are easily separated, which may cause clutch disengagement.
Will be better. Also, the pressure angle θ of the metal tooth_RThan resin teeth
Pressure angle θ_ABy reducing the
Even if the resin tooth contact part is deformed, the resin tooth contact part
The part is deformed so that it fits in the relevant part of the metal tooth, and its contact
The surface pressure decreases as the area gradually increases.
Therefore, it is effective in preventing wear and improves durability.
You. The invention according to claim 3 is an electronic control device for a vehicle engine.
Discontinuity of electromagnetic clutch and drive motor by signal from
Actuating the control member by forward / reverse rotation of
Constant speed running equipment that adjusts the opening of the throttle valve by
And a clutch device for the electromagnetic clutch.
Constant speed characterized by being configured with the clutch device described in 1.
It is a traveling device. According to the constant speed traveling device of claim 3,
Then, the function and effect of the clutch device according to claim 1 are obtained.
And low noise and excellent durability can be obtained.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION A constant speed traveling device showing an embodiment of the present invention will be described with reference to the drawings. 1 shows a cross-sectional view of a constant speed traveling device, FIG. 2 shows a bottom view of the device with an under cover removed, and FIG. 3 shows a partially cutaway bottom view of the device with a wiring plate removed. Is shown. As described above, the constant-speed traveling device operates by opening and closing the throttle valve by engaging and disengaging the electromagnetic clutch and operating the control member by forward and reverse rotation of the drive motor in response to a signal from the electronic control device of the vehicle engine. It is to adjust the degree.

In FIG. 1, the housing 2 of the constant speed traveling device 1 is made of, for example, aluminum die casting (may be made of resin).
The bottom cover 3 has an opening on the lower surface and covers the opening. The driving motor 4 is housed in the right part of the housing 2 and the electromagnetic clutch 5 is installed in the left part of the housing 2.
And a reduction gear mechanism 7 for transmitting power from the drive motor 4 to the electromagnetic clutch 5 is further housed in the upper part. The drive motor 4 is composed of a DC motor capable of rotating in the forward and reverse directions, and is fixed by an iron plate motor fixing plate 9 attached to the housing 2 with screws 8 as shown in FIG.

As shown in FIG. 1, the output shaft 10 penetrating the axial center of the electromagnetic clutch 5 is rotatable at the upper end thereof to the housing 2 and at the lower end thereof to a stator 16 (described later) of the electromagnetic clutch 5. It is supported. The upper end of the output shaft 10 projects from the upper surface of the housing 2, and the control link 11 is fastened to the projecting end by a fixing nut 13. The control link 11 corresponds to a control member in the present invention, and is connected to a link member of a slot valve of a throttle valve (not shown) through a connecting member such as a control wire 14 as well known in the art. By rotating the link 11 in the opening direction, the control wire 14 is wound up and the throttle valve is rotated in the opening direction.

A back spring 15 is mounted between the control link 11 and the housing 2. The back spring 15 has a weaker urging force than the throttle valve back spring for urging the throttle valve in the closing direction, so that the control link 11 is always provided.
Open direction (direction interlocking with the opening direction of the throttle valve)
The control wire 14 is prevented from being loosened by being biased to.

Next, the electromagnetic clutch 5 will be described with reference to the enlarged sectional view of FIG. The electromagnetic clutch 5 includes a stator 16 fixed to the lower surface side of the housing 2, a clutch coil 17 provided in the stator 16, and a rotor 18 fixed to the output shaft 10 on the same axis.
And an armature 19 rotatably and axially movable on the output shaft 10 on the rotor 18, and the armature 19 is interposed between the armature 19 and the rotor 18 to urge the armature 19 upward. And a wave washer 20.

A bearing bush 21 having a flange 22 is inserted into the portion of the output shaft 10 on the rotor 18. The flange 22 of the bearing bush 21 restricts the rising position of the armature 19. Further, the bearing bush 21 rotatably supports a final gear 23 of the reduction gear mechanism 7 described later on the flange 22. A connection hole 24 is opened in the final gear 23, and a connection pin 25 provided on the armature 19 is engaged with the connection hole 24 so as to be axially movable and synchronously rotatable. The armature 19 and the rotor 18 are
In the clutch device according to the present invention, the armature 19 corresponds to a drive-side power transmission member, the rotor 18 corresponds to a driven-side power transmission member, and its opposing end surface is shown in a perspective view in FIG. 7. As described above, the clutch teeth 190 and 180 in the form of crown gears are respectively provided.

The electromagnetic clutch 5 includes a clutch coil 1
7 is not energized, the armature 19 is in the raised position with the urging of the wave washer 20 as shown by the solid line in FIG. 4, and the clutch teeth 180 of the rotor 18 as shown in the left half of the operation explanatory view of FIG. Since there is an air gap G between the clutch teeth 190 of the armature 19 and the clutch teeth 180 of the armature 19, the clutch teeth 180 and 190 are not meshed with each other.
The rotor 18 and the armature 19 are in a freely rotatable state, that is, a power transmission cutoff state (also referred to as a clutch release state).

When the clutch coil 17 is energized in this power transmission cutoff state, the magnetic flux generated thereby attracts the armature 19 to the rotor 18 side against the bias of the wave washer 20. As shown in the right half of FIG. 3, the armature 19 moves by the stroke S and the clutch teeth 190 are engaged with the clutch teeth 180, so that the rotor 18 and the armature 19 are connected, and the rotor 18 and the armature 19 can be rotated integrally (clutch engagement state). It is also called a state). When the energization of the clutch coil 17 is cut off in the power transmission state, the armature 19 is returned to the raised position by the urging of the wave washer 20 to enter the power transmission cutoff state (clutch release state).

By the way, the rotor 18 having the clutch teeth 180 is formed of a metal material such as an iron-based sintered metal. As a result, the clutch teeth 180 are metal teeth (identical to the clutch teeth 180). On the other hand, as shown in FIG. 4, the armature 19 has clutch teeth 190 on the outer periphery of an annular plate main plate 19a made of metal, for example, an iron plate, which is a main body to which the connecting pin 25 is attached.
A resin portion 19b made of resin, for example, 66 nylon, which forms the (resin tooth), is integrally formed. The resin portion 19b is made of a resin material excellent in noise characteristics, self-lubricating property, mechanical strength and wear resistance, such as nylon resin such as 6 nylon and 12 nylon, and mineral reinforced resin in addition to 66 nylon. Can be adopted. It was confirmed by experiments that the glass fiber-containing nylon resin is more easily worn than the glass fiber-free nylon resin. As a result, the clutch teeth 190 become resin teeth (clutch teeth 190
The same reference numerals are used).

Further, as shown in the explanatory view of FIG. 6, the pressure angle θ of the clutch teeth (metal teeth) 180 of the rotor 18 is increased.
_R and clutch tooth (resin tooth) 190 of armature 19
The pressure angle θ _A is set to the relationship of θ _R > θ _A.
In the present embodiment, for example, the pressure angle θ _R is set to 20 ° and the pressure angle θ _A is set to 18 °.

Next, the reduction gear mechanism 7 including the final gear 23 will be described with reference to the explanatory view of FIG. 5A is a plan view and FIG. 5B is a side view. A worm gear 27 is attached to the output shaft (denoted by reference numeral 4a) of the drive motor 4.
Is attached. A first reduction gear 28 and a second reduction gear 29 having large and small gears are arranged between the worm gear 27 and the final gear 23. The reduction gears 28 and 29 are rotatably supported by respective support shafts (not shown) fixed to the housing 2. The worm gear 27 and the large gear 28a of the first reduction gear 28 mesh with each other. The small gear 28b of the first reduction gear 28
And the large gear 29a of the second reduction gear 29 mesh with each other. The small gear 29b of the second reduction gear 29 and the final gear 23 mesh with each other. Therefore, the driving force of the drive motor 4 is decelerated and transmitted to the final gear 23 via the reduction gear mechanism 7.

1 and 2, the output shaft 1 protruding from the lower surface of the stator 16 of the electromagnetic clutch 5
A limit lever 30 made of an iron plate is fastened to a protruding end portion of the lower end of 0 by a fixing nut 31. A fully closed contact portion 32 is formed by bending at the front end portion of the limit lever 30 in the closing direction. When the output shaft 10 rotates to the fully closed position, the fully closed contact portion 32 comes into contact with the rubber stopper 33 as shown by the solid line in FIG. 2 to rotate the output shaft 10 in the closing direction. Regulate. The rubber stopper 33 is fixed to a predetermined portion of the housing 2. Further, in FIG. 2, the rear end portion of the limit lever 30 in the closing direction is a fully open contact portion (denoted by reference numeral 34),
When the output shaft 10 is rotated to the fully open position, it abuts on the stopper portion 35 of the housing 2 as shown by the chain double-dashed line in FIG. 2 to restrict the rotation of the output shaft 10 in the opening direction.

A limit arm 36 made of a leaf spring is attached to the limit lever 30. The limit arm 36 is provided with folded-back working ends 37 and 38 at both ends, and when the output shaft 10 is rotated to the fully open position, one working end 37 of the limit arm 36 is provided.
2 pushes the operating lever 40a of the limit switch 40 for fully open position detection as shown by the chain double-dashed line in FIG. 2, and when the output shaft 10 is rotated to the fully closed position, the other working end of the limit arm 36 is 38 pushes the operation lever 41a of the limit switch 41 for fully closed position detection as shown by the solid line in FIG.

The limit switches 40 and 41 output detection signals to the electronic control unit when the operating levers 40a and 41a are pressed, and the housing 2
Is mounted on the lower surface of the wiring plate 42 fixed with screws 42a so as to cover almost half of the lower surface of the opening (almost right half of FIG. 2). The wiring plate 42 constitutes a resin printed circuit board, and as shown in FIG. 2, on the lower surface thereof, in addition to the limit switches 40 and 41, two drive motor rotation direction switching diodes 43 and four A terminal 44 is mounted. Further, each connection terminal (reference numeral omitted) of the drive motor 4 and the clutch coil 17 is connected to the conductor portion of the wiring plate 42. Further, as shown in FIG. 1, a connector terminal 47 of a connector 45 attached to the housing 2 and provided with a clutch coil diode 46 is connected to the terminal 44.

In the above-described constant speed traveling device 1, when the drive motor 4 is driven based on the signal from the electronic control unit, the motor driving force is the worm gear 27 of the output shaft 4a.
Is transmitted to the final gear 23 via the reduction gear mechanism 7. When the electromagnetic clutch 5 is in the power transmission cutoff state as shown in FIG. 1, the armature 19 connected to the final gear 23 by the connecting pin 25 idles with respect to the rotor 18, and therefore the output shaft 10 is driven by the motor. No power is transmitted.

Next, when the clutch coil 17 of the electromagnetic clutch 5 is energized based on the signal from the electronic control unit,
The armature 19 is attracted to the rotor 18, and the clutch teeth 190 of the armature 19 mesh with the clutch teeth 180 of the rotor 18. As a result, the motor driving force can be transmitted to the output shaft 10 via the rotor 18. The rotation of the output shaft 10 adjusts the opening of the throttle valve so that the vehicle runs at a constant speed.

When the traveling control is canceled during traveling at a constant speed, for example, when the brake is depressed, the electronic control unit cuts off the power supply to the clutch coil 17 of the electromagnetic clutch 5 based on the detection signal, while the drive motor is driven. A signal for rotating 4 to the initial position is output. When the power supply to the clutch coil 17 of the electromagnetic clutch 5 is cut off, the control link 11 is turned to the fully closed position via the control wire 14 as the throttle valve is returned to the fully closed position by its back spring. Be moved. Further, during traveling at a constant speed, the limit lever 30 is operated by the control levers 40a, 41a of the limit switches 40, 41.
When is pressed, the electronic control unit controls the drive motor 4 based on the detection signals from the limit switches 40 and 41.
Cut off the power supply to.

In the above-described constant speed traveling device 1, the clutch device of the electromagnetic clutch 5 has the metal teeth 180 of the clutch teeth.
And the resin teeth 190 are meshed with each other, the noise due to the collision of the clutch teeth 180, 190 during meshing is reduced due to the sound absorbing property of the resin teeth 190 as compared with the meshing of the metal teeth. Due to the self-lubricating property of 190, both clutch teeth 180, 190 are less worn, and the durability of the clutch teeth 180, 190 is improved.

The pressure angle θ _R of the metal tooth 180 and the resin tooth 1
By setting the pressure angle θ _{A of} 90 in the relation of θ _R > θ _A , as shown in the explanatory view of FIG.
0 and the resin teeth 190 are in mesh with each other by a line contact type contact (a contact part is designated by a symbol M), so compared with a surface contact type contact with each other at the same pressure angle. Metal teeth 180 and resin teeth 190 when disengaging the clutch
And are easy to separate, and the clutch is released easily. Incidentally, when the drive motor 4 is driven in the reverse direction, the other side is engaged by the linear contact like the above. The pressure angle of the resin teeth 190 than the pressure angle theta _R of the metal teeth 180 theta _A
By reducing the size, resin teeth 1
Even if the abutting portion M of the resin 90 is deformed, the abutting portion M of the resin tooth 190 is changed to the metal tooth 18 as shown in the explanatory view of FIG. 8B.
It deforms so as to fit in the portion of 0, and the surface pressure decreases as the contact area gradually increases, which is effective in preventing wear and improves durability.

Further, it is possible to obtain the constant speed traveling device 1 which is low in noise and excellent in durability by the action and effect of the above-mentioned clutch device.

The present invention is not limited to the above embodiment, but can be modified without departing from the scope of the present invention. For example, the clutch teeth 180 of the rotor 18 may be resin teeth and the clutch teeth 190 of the armature 19 may be metal teeth. Further, the clutch device is not limited to the electromagnetic clutch 5 of the constant speed traveling device 1 and other electromagnetic clutches 5
Alternatively, it can be applied to a mechanical clutch.

[0028]

According to the present invention, the following effects can be obtained. According to the clutch device of the first aspect, it is possible to reduce noise due to collision when the clutch teeth are engaged with each other and improve durability of the clutch teeth. According to the clutch device of the second aspect, it is effective in preventing wear and further improved in durability. According to the constant speed traveling device of the third aspect, it is possible to obtain a device with low noise and excellent durability.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a constant speed traveling device showing an embodiment.

FIG. 2 is a bottom view of the identification speed traveling device with an undercover removed.

FIG. 3 is a partially cutaway bottom view of the identified speed running device with a wiring plate removed.

FIG. 4 is a sectional view showing a peripheral portion of an electromagnetic clutch.

FIG. 5 is an explanatory view showing a reduction gear mechanism.

FIG. 6 is an operation explanatory view of an electromagnetic clutch.

FIG. 7 is a perspective view of clutch teeth.

FIG. 8 is an explanatory diagram of resin teeth.

[Explanation of symbols]

 1 Constant Speed Travel Device 4 Drive Motor 5 Electromagnetic Clutch 11 Control Link (Control Member) 18 Rotor (Drive Power Transmission Member) 180 Clutch Teeth (Metal Teeth) 19 Armature (Drive Power Transmission Member) 190 Clutch Teeth (Resin Teeth)

Claims (3)

[Claims] 1. A function of transmitting and shutting off power by axial movement of either one of a drive-side power transmission member and a driven-side power transmission member provided on substantially the same axis. A clutch device capable of transmitting power by meshing of crown gear-shaped clutch teeth provided on opposite end surfaces of a power transmission member, wherein the one clutch tooth is a metal tooth and the other clutch meshes with the metal tooth. A clutch device in which the teeth are resin teeth. 2. The clutch device according to claim 1, wherein:
Set the metal tooth pressure angle θ _R and the resin tooth pressure angle θ _A as θ _R > θ
_A clutch device characterized by being set to the relationship of _A. 3. An electromagnetic clutch is connected / disconnected and a drive motor is normally rotated by a signal from an electronic control unit of a vehicle engine.
A constant-speed traveling device that adjusts the opening of a throttle valve by operating a control member by reverse rotation, wherein the clutch device of the electromagnetic clutch comprises the clutch device according to claim 1. .