JP4183481B2 - Transmission - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a transmission used for a machine tool, a construction machine, an agricultural machine, a vehicle machine, and the like.
[0002]
[Prior art]
Although publicly known documents cannot be specifically mentioned, as this type of conventional transmission, there is known an electronically controlled transmission such as an inverter or a servo motor.
[0003]
[Problems to be solved by the invention]
In the above-mentioned transmission by electric control, the torque drops and the output becomes insufficient in the low speed range, and the efficiency is very poor. SUMMARY OF THE INVENTION An object of the present invention is to provide a transmission that can output torque without dropping even in a low speed region, has a simple structure, has a small number of parts, and is easy to manufacture.
[0004]
[Means for Solving the Problems]
The invention according to claim 1 is a transmission having an input shaft 1 and an output shaft 2 that are rotatably supported on the same axis L, and has an internal gear 4 on an inner peripheral surface and rotates integrally with the input shaft 1. The input shaft side rotating body 3 is provided at the output shaft side end portion of the input shaft 1, and the tip end inner peripheral surface has an eccentric inner peripheral surface 6 in a state of enclosing the input shaft side rotating body 3. An output shaft side rotating body 5 that rotates integrally is provided at the input shaft side end portion of the output shaft 2, and a variable speed rotating cylinder 7 having an outer peripheral surface on one end side as an eccentric outer peripheral surface 8 is rotatably attached to the input shaft 1. Fitted to the one end side eccentric outer peripheral surface 8 of the transmission rotating cylinder 7, the one end side outer peripheral surface is formed in the concentric inner side of the transmission gear 11 with the external teeth 10 meshing with the internal gear 4 of the input shaft side rotating body 3. The peripheral surface 12 is rotatably fitted, and the concentric outer peripheral surface 13 of the other end side of the transmission gear 11 is rotatably fitted to the eccentric inner peripheral surface 6 of the output shaft side rotating body 5. Is allowed, further characterized by comprising providing a transmission means 15 for changing the rotational speed to rotate the output shaft side rotation body 5.
[0005]
According to a second aspect of the present invention, in the transmission according to the first aspect, the case 20 enclosing the output shaft side rotating body 5 is connected to the input shaft side end portion of the output shaft 2 and the base end portion of the transmission rotating cylinder 7. It is characterized by being externally fitted to be rotatable.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
1 is a longitudinal sectional view showing an embodiment of a transmission according to the present invention, FIG. 2 is a sectional view taken along line XX of FIG. 1, and FIG. 3 is a sectional view taken along line YY of FIG. The transmission includes a rotatable input shaft 1 and an output shaft 2 rotatable around the same axis L as the input shaft 1. As shown in FIG. 1, the input shaft 1 is connected to a motor whose base end is connected to a motor M such as a prime mover, and the output shaft 2 is connected to a machine whose tip is driven at a variable speed. Yes.
[0007]
The input shaft 1 is provided with an input shaft-side rotating body 3 that rotates integrally with the input shaft 1 at the end on the output shaft 2 side. The input shaft side rotator 3 includes a disc portion 3a concentrically fixed to the input shaft 1 and a short cylindrical portion 3b that protrudes concentrically from the outer periphery of the disc portion 3a. An internal gear 4 is formed on the inner peripheral surface of the cylindrical portion 3b.
[0008]
The output shaft 2 is provided with an output shaft side rotating body 5 that rotates integrally with the output shaft 2 at the end of the input shaft 1 side. The output shaft-side rotator 5 is provided concentrically and integrally with the output shaft 2, and has a disc portion 5a having a diameter larger than that of the disc portion 3a of the input shaft-side rotator 3, and the disc portion 5a. A short cylindrical portion 5b that protrudes concentrically from the outer peripheral portion of the input shaft side and extends longer than the short cylindrical portion 3b of the input shaft side rotating body 3, and an eccentric flange that protrudes inward from the tip of the short cylindrical portion 5b. The inner peripheral surface 6 of the eccentric flange portion 5c is an eccentric inner peripheral surface formed around an axis Le that is eccentric with respect to the axis L of the input shaft 1 and the output shaft 2.
[0009]
Further, a variable speed rotating cylinder 7 is rotatably fitted on the input shaft 1 adjacent to the front side of the input shaft side rotating body 3. The outer peripheral surface 8 on one end side of the transmission rotating cylinder 7 is an eccentric outer peripheral surface formed with an axis Le eccentric with respect to the axis L of the input shaft 1 and the output shaft 2, and the other outer peripheral surface 9 is These are concentric outer peripheral surfaces formed around the axis L of the input shaft 1 and the output shaft 2. Accordingly, the eccentric outer peripheral surface 8 of the transmission rotating cylinder 7 has a concentric inner periphery of the transmission gear 11 formed on the outer peripheral surface on one end side with external teeth 10 that mesh with the internal gear 4 of the input shaft side rotating body 3. The surface 12 is rotatably fitted, and the other end side concentric outer circumferential surface 13 of the transmission gear 11 is rotatably fitted to the eccentric inner circumferential surface 6 of the output shaft side rotating body 5. At this time, as can be seen from FIG. 1, the output shaft side rotating body 5 is arranged in a state of enclosing the input shaft side rotating body 3.
[0010]
Between the outer peripheral surface of the input shaft 1 and the concentric inner peripheral surface 14 of the transmission rotating cylinder 7 fitted thereto, the one end eccentric outer peripheral surface 8 of the transmission rotating cylinder 7 and the concentric inner peripheral surface of the transmission gear 11. 12, and between the other end side concentric outer peripheral surface 13 of the speed change gear 11 and the eccentric inner peripheral surface 6 of the output shaft side rotating body 5, needle bearings n are respectively interposed. A ball bearing m is interposed between the distal end portion of the input shaft 1 and the output shaft side rotating body 5.
[0011]
In FIG. 1, reference numeral 15 denotes a transmission means for changing the rotational speed of the transmission rotating cylinder 7, which slides on the flange member 16 fixed to the other end (base end) of the transmission rotating cylinder 7 and the input shaft 1. The flange member 17 is attached so as to be axially slidable via a key 21, and the magnet 18 is provided with a pair or a plurality of pairs of S and N poles attached to both flange members 16 and 17.
[0012]
In FIG. 1 to FIG. 3, reference numeral 20 denotes a case that encloses the output shaft-side rotator 5, with respect to the input shaft-side end portion of the output shaft 1 and the base-end-side concentric outer peripheral surface 9 of the transmission rotating cylinder 7. It is fitted externally for rotation. As shown in FIG. 1, the case 20 includes a hollow disk-shaped output shaft side end plate portion a covering the disk portion 5 a side of the output shaft side rotating body 5, and a short cylinder of the output shaft side rotating body 5. The output shaft side end plate portion a includes a short cylindrical tube portion b that covers the side of the portion 5b, and a transmission rotary tube side end plate portion c that covers the eccentric flange portion 5c side of the output shaft side rotating body 5. Is inserted into and supported by the output shaft 2 via the ball bearing u, and the shift rotary cylinder side end plate portion c is inserted and supported by the shift rotary cylinder 7 via the ball bearing u. The case 20 can be fixed to a fixing part such as a base when installing the transmission.
[0013]
Next, the operation of the transmission configured as described above will be described. In a state where the pair of flange members 16 and 17 of the transmission means 15 are sufficiently separated from each other, the transmission rotating cylinder 7 does not rotate even when the input shaft 1 rotates. Accordingly, at this time, when the input shaft 1 is rotated at a constant speed by the motor M and the input shaft side rotating body 3 integrated therewith rotates around the axis L, the speed change gear 11 rotates around the eccentric axis Le. As a result, it does not revolve around the axis L, so that the output shaft side rotating body 5 does not rotate and remains stationary.
[0014]
When the input shaft side flange member 17 of the speed change means 15 that rotates together with the input shaft 1 is gradually approached from the above state toward the speed change rotation tube side flange member 16, the speed change rotation tube side flange member is obtained. 16 starts rotating in the same direction as the input shaft 1 due to the magnetic force, and thereby the speed-change rotating cylinder 7 starts rotating. By the rotation of the transmission rotating cylinder 7, the transmission gear 11 revolves around the axis L of the input shaft 1 and the output shaft 2 while rotating around the eccentric axis Le.
[0015]
When the speed change gear 11 revolves around the axis L while rotating around the eccentric axis Le, the output shaft side rotator 5 rotates around the axis L of the input shaft 1 and the output shaft 2, thereby shifting the output shaft 2. It rotates in the same direction as the rotary cylinder 7 and the input shaft 1 and at the same rotational speed as the rotary cylinder 7 for shifting.
[0016]
Thus, when the transmission rotating cylinder 7 is rotated integrally with the input shaft 1 with the flange members 16 and 17 of the transmission means 15 being in close contact with each other, the output shaft 2 is rotated at the same rotational speed as the input shaft 1. Will rotate. Further, when the two flange members 16 and 17 of the speed change means 15 are separated from each other, the rotational speed of the output shaft 2 becomes slower. Therefore, the output shaft 2 can be steplessly changed to the desired number of revolutions by changing the rotational speed of the speed change rotating cylinder 7 by the speed change means 15.
[0017]
According to this transmission, since the structure is simple and the number of component parts is small, it is possible to reduce the size and size of the apparatus, and it is easy to manufacture and to reduce the cost. Further, the output shaft side rotator 5 located on the outermost peripheral side from the axis L and the input shaft side rotator 3 located on the inner periphery side of the rotator 5 only revolve around the axis L, respectively, that is, rotate eccentrically. Instead, only the transmission gear 11 that is eccentrically rotated on the inner peripheral side of the input shaft side rotating body 3 and fitted to the one end side eccentric outer peripheral surface 8 of the transmission rotating cylinder 7 is used. During the rotation of the rotating bodies 3, 4, the rotating cylinder 7 and the speed change gear 11, the input shaft 1 and the output shaft 2 do not run out or vibrate.
[0018]
A case 20 that encloses the output shaft side rotating body 5 is rotatably fitted to the input shaft 1 side end portion of the output shaft 2 and the base end portion outer peripheral surface 19 of the transmission rotating cylinder 7. Therefore, the output shaft side rotating body 5 located on the outermost peripheral side of the transmission is protected by the case 20 to ensure work safety. Further, since the output shaft side rotator 5 at the outermost periphery of the transmission does not rotate eccentrically, the inner peripheral surface of the case 20 enclosing it is brought as close as possible to the outer peripheral surface of the output shaft side rotator 5. As a result, the case 20 can be made as small in diameter and small as possible.
[0019]
FIG. 4 shows another embodiment of the transmission according to the present invention, and the configuration of the transmission means 15 is different from the transmission of FIG. That is, the speed change means 15 has a pulley 22 that is externally fitted to the speed change rotary cylinder 7 via a sliding key 21, and is different from the pulley 22 and the motor M to which the input shaft 1 is interlocked. The belt 23 is hung on a pulley (not shown) attached to a rotating shaft (not shown) such as an electric motor. The pulley 22 is composed of a pair of halves 22a and 22b. One of the halves 22a is fixed to the transmission rotating cylinder 7, and the other half 22b is integrated with the transmission rotating cylinder 7. It is attached so as to be rotatable and slidable in the axial direction, and is biased in a direction approaching the half body 22a by a resilient member (not shown) such as a spring.
[0020]
Therefore, when the rotating shaft of the motor (not shown) rotates, the pulley 22 and the transmission rotating cylinder 7 rotate together, and the half 22b approaches and separates from the half 22a. 23 can be slid in the radial direction of the pulley 22, thereby changing the rotational speed of the pulley 22 and the transmission rotating cylinder 7. The transmission shown in FIG. 4 is the same as the transmission shown in FIG.
[0021]
Accordingly, in this transmission, when the transmission rotating cylinder 7 is rotated at a desired speed by the transmission means 15 while the input shaft 1 is rotated at a constant speed by the motor M, the rotation of the transmission rotating cylinder 7 causes the rotation. The transmission gear 11 revolves around the axis L of the input shaft 1 and the output shaft 2 while rotating around the eccentric axis Le. When the transmission gear 11 rotates around the axis L while rotating around the eccentric axis Le in this way, the output shaft side rotating body 5 rotates around the axis L of the input shaft 1 and the output shaft 2, thereby shifting the output shaft 2. It rotates in the same direction as the rotary cylinder 7 and the input shaft 1 and at the same rotational speed as the rotary cylinder 7 for shifting. Therefore, the output shaft 2 can be shifted to a desired number of revolutions by changing the rotational speed of the transmission rotating cylinder 7 by the transmission means 15.
[0022]
In the transmission described with reference to FIGS. 1 to 4, the eccentric amount of the eccentric axis Le with respect to the axis L can be arbitrarily set.
[0023]
【The invention's effect】
According to the transmission of the first aspect of the invention, the output shaft can be shifted to the desired number of rotations only by changing the rotational speed of the speed change rotating cylinder by the speed change means, and the torque is reduced even in the low speed range. And can output efficiently. Further, according to this transmission, since the structure is simple and the number of component parts is small, it is possible to reduce the size and size of the apparatus, and it is easy to manufacture and to reduce the cost.
[0024]
Further, according to the transmission of the present invention, the output shaft side rotating body located on the outermost side from the input shaft and the output shaft axis and the input shaft side rotating body located on the inner peripheral side of the rotating body are respectively arranged around the axis line. The only thing that revolves is that it is on the inner peripheral side of the input shaft side rotating body and is fitted on the one end side eccentric outer peripheral surface of the transmission rotating cylinder. During the rotation of the rotating body, the rotating cylinder and the transmission gear, the input shaft and the output shaft do not run out or vibrate, and the rotation is stabilized.
[0025]
According to the transmission of the second aspect of the invention, the case that encloses the output shaft side rotating body is rotatably fitted to the end portion of the output shaft and the base end portion of the transmission rotating cylinder. The output shaft side rotor on the outermost peripheral side of the transmission is protected by this case, so that safety in operation is ensured. Further, since the output shaft side rotator on the outermost peripheral side does not rotate eccentrically, the inner peripheral surface of the case enclosing it can be brought as close as possible to the outer peripheral surface of the output shaft side rotator. The case can be made as small as possible with a small diameter.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an embodiment of a transmission according to the present invention.
FIG. 2 is a cross-sectional view taken along line XX in FIG.
3 is a cross-sectional view taken along line YY in FIG.
FIG. 4 is a longitudinal sectional view showing another embodiment of the transmission according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Input shaft 2 Output shaft 3 Input shaft side rotary body 4 Internal gear 5 Output shaft side rotary body 6 Eccentric inner peripheral surface 7 of the output shaft side rotary body Shifting rotary cylinder 8 One end side eccentric outer peripheral face 10 of the transmission rotary cylinder Gear external teeth 11 Gear 15 for transmission 15 Transmission means 20 Case

Claims (2)

In a transmission having an input shaft and an output shaft that are rotatably supported on the same axis, an input shaft-side rotating body that has an internal gear on its inner peripheral surface and rotates integrally with the input shaft is provided on the output shaft side of the input shaft. An output shaft-side rotating body that is provided at the end and has an eccentric inner peripheral surface on the tip-side inner peripheral surface in a state of enveloping the input shaft-side rotating body and rotates integrally with the output shaft is connected to the input shaft-side end of the output shaft. The transmission shaft is rotatably fitted on the input shaft with the outer peripheral surface on one end side as an eccentric outer peripheral surface, and the one end side outer peripheral surface is input to the one end side eccentric outer peripheral surface of the transmission rotary tube. The concentric inner peripheral surface of the speed change gear formed with external teeth meshing with the internal gear of the shaft side rotating body is rotatably fitted, and the other end side concentric outer peripheral surface of the speed change gear is connected to the output shaft side rotating body. A transmission comprising a transmission means that is rotatably fitted to an eccentric inner peripheral surface, and further changes a rotational speed of a transmission rotating cylinder. The transmission according to claim 1, wherein a case enclosing the output shaft side rotating body is rotatably fitted to an input shaft side end portion of the output shaft and a base end portion of the transmission rotating cylinder.

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