JPH06229449A - Planetary mechanism-type power transmitting device - Google Patents

Abstract

PURPOSE:To enable a power transmitting device to be miniaturized by integrating the stator of a speed controlling motor with a housing and also integrating the rotor of the motor with the internal gear or the bearing ring of a planetary mechanism, and enable the rotational speed of an output shaft to be made a desired value only by controlling the speed electrically. CONSTITUTION:A planetary mechanism-type power transmitting device is composed of a hollow rotary body 6 housed in a housing 1, an input shaft 2, an output shaft 11 protruded from the direction opposite to that of the input shaft 2, an internal gear 10 formed on the inner peripheral surface of the hollow rotary body 6, a mechanism composed of a sun gear 9 fixedly attached to the input shaft 2 and a plurality of planetary gears 13 arranged in a carrier fixedly attached to the output shaft 11, and to be simultaneously engaged with both the sun gear 9 and the internal gear 10, a motor composed of a rotor 14 attached on the outer peripheral surface of the hollow rotating body 6 and a stator 15 for surrounding the rotor 14 attached on the inner peripheral surface of the housing 1 and a rotation control unit. The rotation control unit is composed of a rotational speed detector 21 provided on the output shaft 11, a rotational speed command means 22 and a motor driver 23 to be connected to the coil of the stator 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power transmission device, for example, a drive speed reducer for an auxiliary machine or the like in an automobile.

[0002]

2. Description of the Related Art In the prior art, when an auxiliary machine or the like is driven by an automobile engine, the auxiliary machine or the like is connected to the output shaft of the speed reducer via the speed reducer. And, in general, the reduction ratio of the reduction gear is fixed, and in the case of variable speed, a speed change belt mechanism is used.

[0003]

In the speed reducer according to the above-mentioned prior art, since the reduction ratio is fixed,
It is difficult to drive auxiliaries and the like at a speed at which optimum transmission efficiency is obtained, and the performance is poor. Further, the structure using the variable speed transmission belt mechanism has a complicated structure, and it is difficult to downsize the structure. The present invention provides a power transmission device that is easy to shift and is downsized.

[0004]

A planetary mechanism type power transmission device according to the present invention includes a housing, a hollow rotating body rotatably housed in the housing, and a hollow rotating body concentric with the hollow rotating body in the housing. An input shaft that protrudes, penetrates the hollow rotating body, and is rotatable with respect to the housing and the hollow rotating body, and an output shaft that projects into the housing from a direction opposite to the input shaft and is coaxial with the input shaft. Inner peripheral surface track member formed on the inner peripheral surface of the body, solar rotor fixed to the input shaft and concentric with the inner peripheral surface track member, carrier fixed to the output shaft and the circumference of the carrier Mounted on the outer peripheral surface of the hollow rotating body, and a planetary mechanism composed of a plurality of planetary rotating bodies which are arranged in a circular shape and are rotatably supported, and which are simultaneously engaged with both the sun rotating body and the inner peripheral surface orbit member. Rotor and housing A motor comprising a stator which surrounds the mounted rotor on the inner peripheral surface, and a rotational speed control section.

The rotation speed control section comprises a rotation speed detector provided on the output shaft, a rotation speed command means, and a motor driver connected to both of them and connected to the motor. , The detection signal from the rotation speed detector and the command signal from the rotation speed command means are input,
The number of revolutions of the motor is controlled based on the difference between the two signals.

[0006]

Since the hollow rotor, that is, the inner peripheral surface track member, is rotationally driven by the motor, the rotation speed of the carrier, that is, the rotation speed of the output shaft, is the same as the rotation speed of the sun rotor, that is, the rotation speed of the input shaft. It is an average value with the rotation speed of the motor. Therefore, the rotation speed of the output shaft can be controlled by changing the rotation speed of the motor.

When the input shaft is rotationally driven and the motor is rotationally driven at an appropriate rotational speed, the output shaft is rotationally driven at a rotational speed based on the planetary mechanism. At that time, the rotation speed of the output shaft is detected by the rotation speed detector, and the detected rotation speed signal is input to the motor driver. On the other hand, the command rotation speed signal, which is the desired rotation speed of the output shaft, is also input to the motor driver from the rotation speed command means.

In the motor driver, the detected rotation speed is compared with the command rotation speed, the rotation speed of the motor is controlled according to the difference, the motor is accelerated / decelerated, and the detected rotation speed becomes equal to the command rotation speed. There will be no difference between the two. That is, the rotation speed of the output shaft is always maintained at the desired command value.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A planetary mechanism type power transmission device having a rotation speed control unit according to an embodiment of the present invention will be described with reference to the drawings. In FIG. 1, an input shaft 2 located on the central axis of a cylindrical cup-shaped housing 1 penetrates an end wall 1a of the housing 1 and projects into the housing 1, and is rotatably supported by a bearing 3 on the end wall 1a. . Inside the housing 1, a rotating body 6 including a large-diameter cylindrical portion 4 and a small-diameter cylindrical portion 5 is housed.

The outer end surface of the large-diameter cylindrical portion 4 of the rotating body 6 is substantially flush with the housing opening end surface, and the large-diameter cylindrical portion 4 is formed.
The outer peripheral surface of the outer end of the rotor is rotatably supported by the bearing 7 on the inner peripheral surface of the open end of the housing 1, and the inner end surface of the small-diameter cylindrical portion 5 of the rotating body 6 is the end wall 1a of the housing 1. , And the inner peripheral surface of the small-diameter cylindrical portion 5 is rotatably supported on the input shaft 2 by bearings 8, 8.

The tip of the input shaft 2 projects into the large-diameter cylindrical portion 4, and a sun gear 9 is fixed to the tip thereof. The sun gear 9 is the inner circumference of the outer end of the large-diameter cylindrical portion 4. It is concentric with the internal gear 10 formed on the surface.

An output shaft 11 extending from a direction opposite to the input shaft 2 toward the open end of the housing 1 is in a coaxial relationship with the input shaft 2, and a gear carrier 12 is attached to the tip of the output shaft 11. A plurality of (for example, three in the illustrated example) planetary gears 1 which are rotatably supported on the circumference 12 at equal intervals.
Each of 3, 13, 13 meshes with both the sun gear 9 and the internal gear 10 at the same time. That is, they constitute a so-called planetary gear mechanism. A so-called traction drive mechanism may be configured by using a friction roller and an annular bearing ring instead of the sun gear 9, the internal gear 10, and the planetary gears 13, 13, 13.

A rotor 14 made of a magnet is attached to the outer peripheral surface of the small-diameter cylindrical portion 4 of the rotating body 5, and a stator 15 made of a motor coil surrounding the rotor 13 is attached to the inner peripheral surface of the housing 1. The motor M is constituted by the stator 15 and the stator 15. As the motor M, there are a DC motor, an AC motor, an induction motor and the like.

The rotation speed control unit 20 includes a rotation speed detector 21 provided on the output shaft 11, a rotation speed command means 22, and a motor driver 23 connected to both of them and to a motor coil of the stator 15. It consists of and.

The motor driver 23 receives a detection signal from the rotation speed detector 21 and a command signal from the rotation speed command means 22, and controls an exciting current to the motor coil based on a comparison difference between these signals. Then, the rotation speed is controlled. As a practical example, an engine is connected to the input shaft of the power transmission device, and an auxiliary machine or the like is connected to the output shaft for use.

The number of teeth of each gear of the planetary gear mechanism is proportional to the radius of each gear, and is considered in the same manner as the traction drive mechanism. Radius ri of the input shaft 2, that is, the sun gear 9, rotational speed ni, peripheral speed vi; radius rs of planetary gear 13, rotational speed n
s, peripheral speed vs; radius ro of internal gear 10, rotational speed no, peripheral speed vo; radius rp of gear carrier 12, rotational speed np, peripheral speed vp, ri + ro = 2rp

When the gear carrier 12 is fixed (vp =
0, np = 0) vi = -vo = vs (1) Generally, since v = nr, from the formula (1), ni x
ri = -no x ro = ns xrs ∴ no =-(ri / ro) xni (2) ns = (ri / rs) xni (3)

When the entire system is rotated at np, the rotation speed of the sun gear 9 is Ni = ni-np (4) The rotation speed of the planetary gear 13 is Ns = ns + np. 5) Rotational speed of the internal gear 10 No = no + np =-(ri + ro) ni + np (6) Rotational speed of the gear carrier 12 Np = np (7)

From equations (4) and (7), ni = Ni-Np (8) Equation (8) is substituted into equation (6) to obtain No =-(ri / ro) (Ni -Np) + Np =-(ri / ro) Ni + {1+ (ri / ro)} Np Np = [1 / {1+ (ri / ro)}] * {No + (ri / ro) Ni} = {ro / (Ro + ri)} × No + {ri / (ro + ri)} × Ni} ... (9)

From (ro + ri) Np = ro.multidot.No + ri.multidot.Ni ro + ri = 2rp, 2rp.multidot.Np = ro.multidot.No + ri.multidot.Ni v = n.times.r, 2Vp = Vo + Vi ∴Vp = (Vo + Vi) /

Therefore, the peripheral speed of the gear carrier 12 is an average value of the peripheral speed of the sun gear 9 and the peripheral speed of the internal gear 10. Therefore, in FIG. 1, since the internal gear 10 is rotationally driven by the motor M, the rotation speed of the gear carrier 12, that is, the rotation speed of the output shaft 11, is the rotation speed of the sun gear 9, that is, the rotation of the input shaft 2. It is the average value of the speed and the rotation speed of the motor.
Therefore, the rotation speed of the output shaft 11 can be controlled by changing the rotation speed of the motor M.

Engine rotation speed (rotation speed / unit time)
When the input shaft 2 is rotationally driven by and the motor M is rotationally driven at an appropriate rotational speed (rotational speed / unit time), the output shaft 11 is rotated at the rotational speed (rotational speed / unit time) based on the above formula. That is, the auxiliary machine is driven to rotate. At that time, output shaft 1
1, that is, the rotation speed of the auxiliary machine or the like is detected by the rotation speed detector 21, and the detected rotation speed signal is input to the motor driver 23. On the other hand, a command rotation speed signal, which is a desired rotation speed of an auxiliary machine or the like, is also input from the rotation speed command means 22 to the motor driver 23.

In the motor driver 23, the detected rotation speed is compared with the command rotation speed, and the motor M is compared according to the difference.
The exciting current to the motor coil of is controlled, the motor M is accelerated and decelerated, and the detected rotation speed becomes equal to the command rotation speed,
There will be no difference between the two. That is, the rotation speed of the auxiliary machine is
The desired command value is always maintained.

[0024]

In the planetary mechanism type power transmission device of the present invention, the stator of the speed control motor is integrally formed in the housing, and the internal gear or the race ring of the planetary mechanism is provided with the rotor of the motor. Since it is integrally configured, its structure is simple and extremely miniaturized. Only by electrically controlling the rotation speed of the speed control motor, the rotation of the output shaft can be performed regardless of the rotation speed of the input shaft. It is possible to easily bring the speed to the desired value.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a planetary mechanism type power transmission device power transmission device according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

[Explanation of symbols]

1 Housing 1a End Wall 2 Input Shaft 3, 7, 8 Bearing 4 Large Diameter Cylindrical Part 5 Small Diameter Cylindrical Part 6 Rotating Body 9 Sun Gear 10 Internal Gear 11 Output Shaft 12 Gear Carrier 13 Planetary Gear 14 Rotor 15 Stator 20 Speed Control Part 21 Rotational speed detector 22 Rotational speed command means 23 Motor driver

Claims (1)

[Claims] 1. A housing, a hollow rotary member rotatably housed in the housing, and a hollow rotary member that is concentric with the hollow rotary member and protrudes into the housing to penetrate the hollow rotary member to form a housing and a hollow rotary member. An input shaft that is rotatable with respect to the input shaft, an output shaft that projects into the housing from a direction opposite to the input shaft, and has a coaxial relationship with the input shaft; and an inner peripheral surface race member formed on the inner peripheral surface of the hollow rotating body. A sun rotor fixed to the input shaft and concentric with the inner circumferential surface track member, a carrier fixed to the output shaft, and a carrier circularly arranged on the carrier and rotatably supported to rotate the sun. A planetary mechanism composed of a plurality of planetary rotating bodies that are simultaneously engaged with both the body and the inner peripheral surface race member, and a rotor attached to the outer peripheral surface of the hollow rotating body and attached to the inner peripheral surface of the housing to surround the rotor. Made of stator Motor and a rotation speed control unit, and the rotation speed control unit is connected to both the rotation speed detector provided on the output shaft and the rotation speed commanding means, and to the motor. The motor driver receives a detection signal from the rotation speed detector and a command signal from the rotation speed command means, and controls the rotation speed of the motor based on a comparison difference between the both signals. Planetary mechanism type power transmission device.