JPS60164054A - Electromagnetic brake for speed changer - Google Patents

Abstract

PURPOSE:To eliminate the inability of speed change operation in a speed changer due to the breakage of an electromagnetic coil, by providing at least two or more electromagnetic coils connecting in parallel in an electromagnetic brake. CONSTITUTION:A rotary member 62 arranges on its periphery an armature drum 66, and a V-belt driven type continuously variable transmission case 10 mounts in its internal peripheral position corresponding to the armature drum 66 an electromagnetic core 68 having two parallely connected electromagnetic coils 67 adjusting the magnetic force to the armature drum 66 and braking the rotary member 62. In this way, inability of speed change operation due to breaking of the electromagnetic coil can be eliminated by enabling the armature drum 66 to be actuated by the other electromagnetic coil 67 even if one of the electromagnetic coils 67 is disconnected.

Description

[Detailed description of the invention] [Field] The present invention relates to a transmission using an electromagnetic brake.

[Prior Art] An electromagnetic brake is provided in a transmission, for example, proposed by the applicant, is provided on an input shaft and an output shaft arranged parallel to the input shaft, and is provided on a fixed flange and an axial direction with respect to the fixed flange. an input pulley and an output pulley consisting of a movable flange that is movable and rotates integrally with the fixed flange, a V-belt that transmits power between the manual pulley and the output pulley, and at least one of the movable flanges or the movable It has a first screw formed on a member that interlocks with the flange, and a second screw screwed into the first screw, and the first screw and the second screw rotate relative to each other to move the movable flange in the axial direction. one servo mechanism provided between the driver element and the V-belt type continuously variable transmission case and having an electromagnetic brake for braking one screw member of the driver element; and at least the input shaft. In recent years, in V-belt type continuously variable transmissions, etc., which are provided on one side of the output shaft and have a servo mechanism on the other side that makes the clamping force between a movable flange, a fixed flange, and the V-belt proportional to the transmission torque of the V-belt. As engine output increases, it is desired to increase the braking force of electromagnetic brakes in order to cope with the increase in transmission capacity within the transmission and the rapidly increasing and decreasing transmission torque. However, increasing the number of turns of the electromagnetic coil increases the current resistance and reduces the amount of current flowing through the electromagnetic coil, making it impossible to increase the braking force. Further, if the electromagnetic coil of the electromagnetic brake is disconnected, the transmission becomes unable to shift, which is not desirable from the viewpoint of safe driving, for example, while the vehicle is running.

``Object of the Invention'' The first object of the present invention is to provide an electromagnetic brake for a transmission that easily increases the braking force of the electromagnetic brake provided in the transmission. middle one
To provide an electromagnetic brake for a transmission that performs a shift function equivalent to normal running without becoming unable to shift during running even if two electromagnetic coils are disconnected.

[Structure of the Invention] The electromagnetic brake for a transmission according to the present invention includes a rotating member that rotates in response to an input rotation, a gear ratio, etc., and a rotation receiver that engages with the rotating member and receives the rotation of the rotating member. and an electromagnetic brake having at least two electromagnetic coils connected in parallel to control the rotating member and the rotation receiving member.

[Effects of the Invention] The electromagnetic brake for a transmission of the present invention having the above-mentioned configuration has the following effects.

b) By providing at least two or more electromagnetic coils of the electromagnetic brake connected in parallel, even if one of the electronic coils is disconnected, the gear shifting function can be performed during normal driving without becoming unable to shift.

(Example) For example, if a conventional electromagnetic coil with the same capacity is used as an electromagnetic brake,
By providing two in parallel, the braking capacity of the electromagnetic brake is approximately doubled, and the braking capacity of the electromagnetic brake can be easily increased.

[Example] Next, an electromagnetic brake for a transmission according to the present invention will be described based on an example shown in the drawings.

FIG. 1 shows an embodiment according to the present invention.

1 is an input shaft of a V-belt type continuously variable transmission, 2 is an output shaft of the V-belt type continuously variable transmission which is parallel to the input shaft 1, 3 is an input boule provided on the input shaft 1, 4 is an output pulley provided on the output shaft 2-H, 5 is a V-belt that transmits power between the input pulley 3 and output pulley 4, and 6 is a V-belt provided on the side of the input shaft 1 that changes the effective diameter of the input pulley 3. One servo mechanism, 7, is the other servo mechanism provided on the side of the output shaft 2 that changes the effective diameter of the output pulley 3.

In this embodiment, the input shaft 1 is formed integrally with a sleeve portion of a fixed flange, which will be described later, and is rotatably supported by bearings 11 and 12 in a V-belt type continuously variable transmission case 1o.

In this embodiment, the output shaft 2 is formed integrally with a sleeve portion of a fixed flange to be described later, is rotatably supported by the V-belt type continuously variable transmission case 1o by bearings 21 and 22, and is connected to the output shaft 2. The output member 23 is rotatably supported by the V-belt type continuously variable transmission case 10 by bearings 24, 25, 26 and 27, and is abutted via a sleeve 28 connected to the output member of the other servo mechanism 7, which will be described later. ing.

The input pulley 3 has an outer circumferential thread 16 and a nut 13 formed on one end (on the right side in the figure), and an outer circumferential thread 14 on the outer periphery of the other end.
and a sleeve-shaped portion 3 provided with a nut 15 and a keyway 32.
3 and a flange portion 35 integrally formed with the sleeve-shaped portion 33;
A key groove 3G corresponding to the key groove 32 of the fixed flange 3A is formed on the inner circumferential wall, and a lead angle larger than the friction angle is formed on the outer circumferential wall. A movable flange 3B consisting of a sleeve-shaped hub portion 38 provided with a ball screw 37, which is a first screw (driven screw), and a flange portion 39 formed integrally with the hub portion 38; 36, which allows the fixed flange 3A and the movable flange 3B to be displaced in the axial direction, and also includes a ball key 3o for integrally rotating around the axis.

The output IJ4 has a keyway 41, a screw 42, and a nut 43 formed on the outer periphery, a sleeve-shaped part 44 formed integrally with the output shaft 2, and a flange part formed integrally with the sleeve-shaped part 44. A fixed flange 4A consisting of 45;
The sleeve-shaped portion 44 of the fixed flange 4A is fitted onto the outside so as to be freely displaceable in the axial direction, and a key groove 49 corresponding to the key groove 41 is provided on the inner periphery, and the sleeve-shaped hub portion 47 and the hub portion 4
a movable flange 4B consisting of a flange portion 48 integrally formed with the fixed flange 4A, and a ball key 40 inserted into the key grooves 41 and 49 to integrally rotate the fixed flange 4A and the movable flange 4B. .

The V-belt 5 has a working surface 51 that forms a friction surface by contacting the V-shaped working surfaces formed by the fixed flange 3A and the fixed flange 4A and the movable flange 3B and the movable flange 4B of the input pulley 3 and the output pulley 4, respectively. and 52 are provided on both sides.

The servo mechanism 6 on one side of the input pulley 3 is a second screw (drive screw) that has a lead angle on its inner periphery that is larger than the friction angle for screwing into the ball screw 37 of the movable flange 3B of the input pulley 3. A ball screw 61 is formed, with one end 621
is a rotating member 62 that is a driver of the movable flange 3B that is in contact with the nut 15 via a thrust bearing 65;
An armature drum 6 is arranged around the outer periphery of the rotating member 62.
G is arranged at the inner circumferential position of the V-belt type continuously variable transmission case 10, which is a rotation receiving member corresponding to the armature drum 66, to increase or decrease the magnetic force to the armature drum 66 and brake the rotating member 62. An electromagnetic core 68 having two electromagnetic coils 67 connected in parallel is installed, and the braking force of an eddy current type electromagnetic brake 63 consisting of an armature drum 66, a V-belt type continuously variable transmission case 10, and the electromagnetic core 68 is input. It controls the movable flange 3B of the pulley 3.

Further, when the human cab 93 rotates clockwise, the ball screw 61 is a left-handed screw.

The other servo mechanism 7 on the output pulley 4 is connected to the nut 43 formed at the end of the output shaft 2 via a thrust bearing 71, and serves as an output member and has an annular triangular waveform surface and an operating surface to be described later. One cam race 72 and the movable flange 4 which is the cam race 72 and the other cam race, has an annular triangular waveform surface, and has a rough surface.
It consists of a taper roller 73 interposed between the right end portion 421 of B and a torsion spring 74 inserted between the movable flange 4B and the cam race 72, and the taper roller 73 is movable with the cam race 72. It is sandwiched between the working surfaces 75 and 16 of the flange 4B, and applies a pressing force proportional to the transmitted torque that presses the movable flange 4B to the left in the figure in response to the rotational displacement between the input shaft 1 and the fixed flange 4A. Occur.

The operation of this V-belt type continuously variable transmission is such that the reduction ratio between the input pulley 3 and the output pulley 4 is the minimum reduction ratio running state, and in this state, the servo mechanisms 6 and 7 operate on the operating surface 7.
The tapered roller 73 is positioned between the recesses in the working surfaces 75 and 76 of the cam race 12 so that the width between the cam races 75 and 76 is minimized, and as both cam races 72 rotate relative to each other, the width between the cam races 72 increases until the width reaches the maximum. During speed reduction ratio running, the distance between the cam races 72 widens. Since the torsion spring 74 constantly generates torque, it can generate axial force even when the transmitted torque is small. Determining the gear ratio is
This is done by increasing or decreasing the torque for braking the rotating member 62 using an eddy current type electromagnetic brake 63.

When the input pulley 3 is rotating, applying a brake force generates torque that attempts to stop the rotating member 62.
Generates an axial force that tries to compress B. Furthermore, since the other servo mechanism 7 generates a shaft saw that tries to compress the movable flange 4B of the output pulley 4, the axial force caused by the electromagnetic brake 63 is balanced with the axial force caused by the other servo mechanism 7. By generating a sufficient braking force, both movable flanges 33143 do not move and the gear ratio is maintained. When the braking force of the electromagnetic brake 63 is increased, the rotation of the rotating member 62 becomes slower than the rotation of the output pulley 4, and the transmission side movable flange 3B is compressed and upshifted to the minimum reduction ratio.

When the braking force is reduced, the axial force exerted by the other servo mechanism 7 overcomes and the transmission side movable flange 3B is pushed open and downshifted. Upshifting occurs fastest when the rotating member 62 is completely fixed by the electromagnetic brake 63, and downshifting occurs fastest when the electromagnetic brake 63 is released from the rotating member 62.

FIG. 2 shows another embodiment of the present invention, in which the same reference numerals as in FIG. 1 indicate the same functional parts.

An electromagnetic brake 63 provided between a rotating member 62 which is a driver of one servo mechanism 6 on the input shaft 1 side and a V-belt continuously variable transmission case 10 which is a rotation receiving member is attached to the outer periphery of the rotating member 62. A plurality of input discs 602 are spline-fitted to driver splines 601 provided on the drive element splines 601, and a case-side spline is provided on the inner periphery of the V-belt continuously variable transmission case 10 at a position corresponding to the driver splines 601. 603
Receiving disks 604 are placed alternately overlapping the input disks 602 that receive the torque of the input disks 602 spline-fitted to the input disks 602, and input disks 6 are placed overlappingly.
02 and a receiving disk 604, a backing disk 605 fitted to the driver spline 601 is attached to the input disk 602 by magnetically attracting the backing disk 605. A multi-disc electromagnetic brake is formed by an electromagnetic core 68 having two electromagnetic coils 67 connected in parallel and engaging a retaining plate 604.

The electromagnetic brake for a transmission of the present invention has the V
The present invention is not limited to eddy current type electromagnetic brakes or multi-plate type electromagnetic brakes in belt type continuously variable transmissions, but can be applied to all transmissions that use the electromagnetic coil 67, including powder set brakes. .

[Brief explanation of drawings]

FIG. 1 is a sectional view of a V-belt type continuously variable transmission using an embodiment of the present invention, and FIG. 2 is a sectional view of a V-belt type continuously variable transmission using another embodiment of the invention. In the diagram: 1... Input shaft 2... Output shaft 3... Input pulley 4... Output pulley 5... V-belt 6.
7... Servo mechanism 10... V-belt type continuously variable transmission case 62... Rotating member 63... Electromagnetic brake
67... Electromagnetic coil agent Kenji Ishiguro

Claims (1)

[Scope of Claims] 1) A rotating member that rotates in response to input rotation and a gear ratio, a rotation receiving member that engages with the rotating member and receives the rotation of the rotating member, and the rotating member. An electromagnetic brake for a transmission, comprising an electromagnetic brake having at least two electromagnetic coils connected in parallel to control the rotation receiving member. 2) The electromagnetic brake is provided on the input shaft and the output shaft arranged parallel to the input shaft, and is movable in the axial direction with respect to the fixed flange, and is integrally formed with the fixed flange. An input pulley and an output pulley comprising a rotating movable flange, a V-belt that transmits power between the manual pulley and the output pulley, and a first screw formed on the at least one movable flange or a member interlocking with the movable flange; and a driver, which is the rotating member, having a second screw screwed into the first screw, the first screw and the second screw relatively rotating to displace the movable flange in the axial direction; one servo mechanism provided between the drive element and the fixed member that is the rotation receiving member, and equipped with a brake that increases or decreases the torque for braking one screw member of the drive element; and at least the input shaft or the output shaft. is provided on one side of the movable flange to displace the movable flange in the axial direction and apply a squeezing force between the movable flange, the fixed flange, and the V-belt while following the movement of the movable flange of the input boob due to the operation of the one servo mechanism. The electromagnetic brake for a transmission according to claim 1, wherein the electromagnetic brake is an electromagnetic brake that increases or decreases the torque of a V-belt type continuously variable transmission comprising the other servo mechanism. 3) The electromagnetic brake is an eddy current type electromagnetic brake that electromagnetically brakes the rotating member and the rotation receiving member using an eddy current. An electromagnetic brake for transmissions as described above. 4) The electromagnetic brake is a multi-plate electromagnetic brake that engages an input plate fitted on the rotating member on one side and a receiving plate fitted on the rotation receiving member on the other side. An electromagnetic brake for a transmission according to claim 1 or 2.