JP2007071248A - Power transmission device for forklift - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce vibration and noise enough to satisfy environmental regulations in a forklift taking an electric motor as a drive source. <P>SOLUTION: In the power transmission device for a forklift, a speed reducer is composed of a first stage reduction gear in which a planetary roller supported by a carrier with circumferential equal intervals is arranged between an inner periphery of an inner roller and an outer periphery of a sum roller fixed to an input shaft and which consists of a planetary roller reduction gear for decelerating rotational force from the driving source at a prescribed reduction ratio to be output to the carrier or an output shaft coupled to the inner roller, and of a second stage reduction gear in which an input shaft is coupled to the output shaft of the planetary roller reduction gear and which decelerates rotational force from the planetary roller reduction gear at a prescribed reduction ratio to be output to the output shaft coupled to the wheel side. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a power transmission device for a forklift configured to decelerate a rotational force from a driving source such as an engine and a motor by a reduction device at a predetermined reduction ratio and to drive a wheel connected to an output shaft of the reduction device. About.

The forklift drive system is a forklift that uses an engine as a drive source. For example, as in the technique of Patent Document 1 (Japanese Patent Laid-Open No. 11-255142), a hydraulic pump is driven by the engine, and the hydraulic pressure from the hydraulic pump is increased. A hydraulic drive system is mainly employed that supplies a hydraulic motor directly connected to the left and right axles and drives the left and right wheels by the hydraulic motor.
On the other hand, in a battery-type forklift that uses an electric motor as a drive source, the hydraulic drive system is a large-scale device. Therefore, the rotation of the battery-driven electric motor is decelerated by a gear reducer, and the gear reducer is used as an output shaft. It drives the left and right wheels that are directly connected.

JP 11-255142 A

Forklifts, particularly small battery-type forklifts, are mainly used indoors. In recent years, there has been a great need for noise reduction in terms of environmental regulations.
Such a battery-type forklift is conventionally a drive system in which the rotation of a battery-driven electric motor is decelerated by a gear reducer and the left and right wheels directly connected to the output shaft are driven by the gear reducer as described above. Is generally used.

However, in a drive system configured to decelerate the rotational force from such a motor (drive source) with a reduction gear using a gear reducer and drive a wheel connected to the output shaft of the reduction gear, The vibration and noise caused by the meshing of the gears of the reduction gear are large, and it becomes difficult to satisfy the environmental regulations as described above.
In particular, when the gear reduction device is provided at a high-speed rotating portion directly connected to a motor (drive source) that increases vibration and noise, the above-described problem becomes prominent.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems of the prior art, and particularly aims at providing a power transmission device for a forklift that can sufficiently reduce vibration and noise to a level that satisfies environmental regulations, particularly in a forklift that uses an electric motor as a drive source. To do.

  The present invention achieves such an object, and is configured to decelerate a rotational force from a driving source such as an engine or a motor at a predetermined reduction ratio by a reduction gear, and to drive a wheel connected to an output shaft of the reduction gear. A power transmission device for a forklift, wherein the speed reducer is arranged on a carrier between an outer periphery of a sun roller fixed to an input shaft connected to the drive source side and an inner periphery of an annular inner roller. Planetary rollers supported at equal intervals in the circumferential direction through pins and bearings are disposed, and the output from the drive source is reduced by a predetermined reduction ratio and connected to the carrier or the inner roller. A first-stage speed reducer comprising an output planetary roller speed reducer, and an input shaft connected to the output shaft of the planetary roller speed reducer to reduce the rotational force from the planetary roller speed reducer at a predetermined speed reduction ratio; Output concatenated to the side Characterized by comprising a second stage reduction gear output to.

According to this invention, the input shaft is connected to the drive source side of the engine, motor, etc., and rotates at a high speed to tend to generate vibration and noise. Since the planetary roller reducer is configured to transmit the rotational force by pressure contact, the planetary roller reducer transmits the rotational force by the surface contact of the roller without meshing of the gear as in the prior art, so even at high speed rotation Operation is quiet and even under high-speed rotation directly connected to a drive source such as an engine or motor, operation can be performed with greatly reduced vibration and noise compared to a gear-type speed reducer as in the prior art.
The planetary roller speed reducer is a speed reducer that combines a roller consisting of a sun roller, a planetary roller, and an inner roller, which eliminates the need for gear processing like the conventional gear type speed reducer, simplifies assembly, and reduces costs. It is.

In this invention, it is preferable that the second stage speed reducer is specifically configured as follows.
(1) The second stage speed reducer is a gear train having a small gear fixed to an input shaft connected to the planetary roller speed reducer and a large gear fixed to an output shaft connected to the wheel side. (Claim 2).
Further, the second stage speed reducer is connected between the outer periphery of the sun gear fixed to the input shaft connected to the planetary roller speed reducer and the inner periphery of the annular internal gear via a planetary pin and a bearing. Planetary gears that are supported at equal intervals in the circumferential direction and that reduce the rotational force from the input shaft at a predetermined reduction ratio and output it to the output shaft connected to the carrier or the internal gear. (Claim 3).

  If comprised in this way, the 1st stage speed reducer which has the tendency for a high rotation, a low torque, and a vibration and noise to become large will comprise a planetary roller speed reducer, and the suppression effect of a vibration and noise will be raised, low rotation, By configuring the second stage speed reducer with high torque and vibration and noise smaller than those of the first stage speed reducer as a gear speed reducer, large torque can be transmitted while suppressing vibration and noise.

(2) A planetary pin and a bearing are mounted on the carrier between the outer periphery of the sun roller fixed to the input shaft connected to the planetary roller reducer and the inner periphery of the annular inner roller. Planetary rollers supported at equal intervals in the circumferential direction through the planetary roller, and the rotational force from the input shaft is decelerated at a predetermined reduction ratio and output to the output shaft connected to the carrier or the inner roller. It comprises a reduction gear (claim 4).
If comprised in this way, since the planetary roller speed reducer is connected in two stages in series, it becomes possible to use two planetary roller speed reducers of the same specification, which can reduce the device cost of the speed reducer, Only a planetary roller speed reducer with a large noise suppression effect can be used for two-stage deceleration, and a reduction gear with low vibration and noise at each stage can be obtained.

Moreover, in this invention, Preferably the transmission force adjustment means shown to following (1)-(3) is provided.
(1) In the planetary roller speed reducer, the sun roller and the plurality of planetary rollers are configured as a truncated cone-shaped roller, and the inner surface of the inner roller is formed into a conical inner surface that can come into contact with the conical outer surface of the planetary roller. The conical roller planetary roller speed reducer is formed, and the transmission force acting on the contact surface between the sun roller, the planetary roller, and the inner roller is changed on the input shaft to which the sun roller is fixed. And a torque cam mechanism for changing the rotational force transmitted from the carrier to the carrier.

  (2) In the planetary roller speed reducer, the sun roller and the plurality of planetary rollers are configured as a truncated cone-shaped roller, and the inner surface of the inner roller is formed into a conical inner surface that can come into contact with the conical outer surface of the planetary roller. A conical roller planetary roller speed reducer that is formed, and a bearing that supports an input shaft to which the sun roller is fixed is configured as a bearing having a thrust capacity, and a thrust load is applied to the bearing and the thrust A hydraulic cylinder device for adjusting the load is provided, and the thrust load of the input shaft and the sun roller is changed via the bearing by the hydraulic cylinder device, thereby acting on the contact surfaces of the sun roller, the planetary roller, and the inner roller. The transmission force to be changed is changed, and the rotational force transmitted from the sun roller side to the carrier is changed (claim 6).

  (3) The planetary roller speed reducer connects an output shaft to the carrier, and deforms the inner roller in a radial direction by a change in axial load to change a pressure contact force with the planetary roller. The rotational force transmitted from the sun roller side to the carrier can be changed by changing the axial load (Claim 7).

  When configured as in the above (1) to (3), since the rotational force is transmitted by the surface contact of the roller, a planetary roller speed reducer that is quiet in operation even at high speed rotation can be used to reduce vibration and noise. A hydraulic cylinder device that enables a controlled operation and that combines a conical roller planetary roller reducer and a torque cam mechanism (Claim 5), a conical roller planetary roller reducer, a thrust load load, and a thrust load. (Claim 6), and an elastic ring that changes the pressure contact force with the planetary roller by deforming the inner roller in the radial direction by changing the axial load (Claim 7). As a result, the rotational force transmitted from the sun roller side to the carrier side can be controlled to the target rotational force, and the life of the apparatus can be extended.

  In this invention, it is preferable that the planetary roller speed reducer has an output shaft connected to the carrier, and the outer diameter side of the inner roller is configured as a worm wheel so that the worm wheel can rotate and the worm wheel meshes with the worm wheel. And a worm rotation control device that controls the rotation of the worm, the rotation of the worm is changed by the worm rotation control device, and the rotation of the inner roller is adjusted via the worm wheel, The rotation ratio with the output shaft side is changed.

With this configuration, the rotation of the worm is changed by the worm rotation control device, and the rotation of the inner roller formed on the worm wheel on the outer diameter side is changed, so that the inner roller and the carrier on the output shaft side are changed. It is possible to configure a continuously variable transmission that can change the relative rotational speed and thereby freely change the rotational speed ratio between the input shaft side and the output shaft side, that is, the reduction ratio.
Therefore, the engine or motor constituting the drive source is operated at a constant rotational speed, and the planetary roller speed reducer is used to change the relative rotational speed of the inner roller and the carrier on the output shaft side by the worm rotation control device as described above. By using a continuously variable transmission, the engine or motor can be operated at a constant rotational speed at the highest efficiency point.

According to the present invention, the first stage speed reducer which is connected to the drive source side of the engine, motor, etc. and rotates at a high speed and tends to increase vibration and noise is constituted by the planetary roller speed reducer. The roller speed reducer does not engage with the gear like the conventional gear speed reducer and transmits the rotational force by the roller surface contact. Therefore, the operation is quiet even at high speed rotation, and the high speed rotation is directly connected to the drive source. Even underneath, it can be operated with greatly reduced vibration and noise.
The planetary roller speed reducer is a speed reducer that combines a roller consisting of a sun roller, a planetary roller, and an inner roller, which eliminates the need for gear processing like the conventional gear type speed reducer, simplifies assembly, and reduces costs. The speed reducer can be obtained.

  Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the component parts described in this example are not intended to limit the scope of the present invention only to specific examples unless otherwise specified. Only.

FIG. 1 is a plan view of a forklift speed reducing device according to a first embodiment of the present invention.
In FIG. 1, reference numeral 31 denotes a drive source including an engine, a motor, etc., 26 denotes left and right wheels, 25 denotes an axle, and 30 denotes a differential device that freely rotates the left and right wheels. Reference numeral 100 denotes a rotation axis of the drive source 31. It is also possible to use a separate drive source directly without using a differential.
1 is a planetary roller speed reducer constituting the first stage speed reducer, 2 is a gear speed reducer constituting the second stage speed reducer, and the input rotational speed from the drive source 31 through the differential device is changed to the planetary roller speed reducer ( A two-stage reduction of a first speed reducer 1 and a gear speed reducer (second speed reducer) 2 is performed to drive the axle 25 and the wheels 26.

The planetary roller speed reducer 1 constituting the first stage speed reducer is configured as shown in FIG. 3. In FIG. 3, 14 is an input shaft connected to the output side of the differential device 30, and 11 is the input. A sun roller fixed to the shaft 14, an annular inner roller 13 fixed to the case 13 z, 16 an output shaft, and 15 a carrier fixed to the output shaft 16.
17 is a plurality of planet pins fixed to the carrier 15 at equal intervals in the circumferential direction (four in this example), 12 is a planetary roller rotatably supported on each planet pin 17 via a bearing 18, and 20 is This is a retaining ring for the planetary roller 12 fixed to the shaft end of the input shaft 14.

  In the planetary roller speed reducer 1, the planetary roller 12 is pressed between the outer peripheral surface of the sun roller 11 and the inner peripheral surface of the inner roller 13, and the sun roller 11 is rotated by the input shaft 14. The planetary roller 12 pressed between the sun roller 11 and the inner roller 13 revolves around the center of the sun roller 11 while rotating around the planet pin 17, and the carrier 15 rotates at this revolution speed, and the output shaft 16 rotates at a rotational speed reduced by a rotational speed ratio (reduction ratio) between the rotational speed of the input shaft 14 and the sun roller 11 and the rotational speed of the carrier 15.

  In the gear reducer 2 constituting the second stage reducer, 21 is a small gear (pinion gear), 22 is a large gear, and the small gear 21 is fixed to the output shaft 16 of the planetary roller reducer 1, The large gear 22 is fixed to the axle 25. In such a gear reducer 2, the rotational force that has been reduced in the first stage by the planetary roller reducer 1 is transmitted from the output shaft 16 of the planetary roller reducer 1 to the small gear 21, and The gear 22 is decelerated at a gear ratio and transmitted to the axle 25. An intermediate gear may be interposed between the small gear 21 and the large gear 22.

Although not shown, a known planetary gear reducer may be provided as the second stage reducer instead of the gear reducer 2. This planetary gear speed reducer is arranged in a circumferential direction between the outer circumference of the sun gear fixed to the output shaft 16 of the planetary roller speed reducer 1 and the inner circumference of the annular inner gear via a planet pin and a bearing. A plurality of planetary gears rotatably supported at equal intervals are disposed, the rotational force transmitted from the output shaft 16 to the sun gear is decelerated at a gear ratio between the sun gear and the internal gear, and the carrier It is comprised so that it may output to the axle shaft 25 connected with.

  According to the first embodiment, the input shaft 14 is connected to the drive source 31 side of the engine, motor, etc., and rotates at a high speed so that vibration and noise tend to increase. Since the planetary roller speed reducer 1 is configured to transmit the rotational force by the pressure contact between the roller 12 and the inner roller 13, the planetary roller speed reducer 1 has no gear meshing as in the conventional gear speed reducer, and is in contact with the roller surface. Since the rotational force is transmitted, operation is quiet even at high speed rotation, and vibration and noise are greatly reduced compared to the conventional gear type speed reducer even under high speed rotation directly connected to the drive source 31. You can drive with restraint.

  Further, as described above, the first-stage speed reducer that tends to increase vibration and noise with high rotation and low torque is constituted by the planetary roller speed reducer 1 that transmits the rotational force by the surface contact of the rollers. In addition to improving the effect of suppressing vibration and noise, the rotation of the planetary roller speed reducer 1 results in low rotation and high torque, and vibration and noise are smaller than those on the first stage speed reducer (planet roller speed reducer 1) side. By configuring the second stage reduction gear as the gear reduction gear 2 or the planetary gear reduction gear, a large torque can be transmitted while suppressing vibration and noise.

  The planetary roller speed reducer 1 is a speed reducer that combines a roller composed of a sun roller 11, a planetary roller 12, and an inner roller 13, and does not require gear processing like a conventional gear type speed reducer, and can be assembled. It becomes simple and low cost.

FIG. 2 is a plan view of the forklift speed reducing device according to the second embodiment of the present invention (showing the left half of the rotational axis of the drive source).
In the second embodiment, the first-stage speed reducer and the second-stage speed reducer are configured by connecting two planetary roller speed reducers 1 similar to the first embodiment in series. That is, in the second embodiment, the sun roller 11 of the planetary roller speed reducer 1 constituting the second stage speed reducer is fixed to the output shaft 16 of the planetary roller speed reducer 1 constituting the first stage speed reducer. The carrier 15 is connected to the axle to constitute a two-stage reduction gear in which two planetary roller reduction gears 1 are connected.

According to the second embodiment, since the planetary roller speed reducer 1 is connected in two stages in series, two planetary roller speed reducers 1 having the same specification can be used, and the cost of the forklift speed reducing device can be reduced. It is possible to reduce the speed and the two-stage speed reduction with only the planetary roller speed reducer 1 having a large effect of suppressing vibration and noise, and a reduction gear with small vibration and noise at each stage can be obtained.
Since the second stage speed reducer side has a lower rotation and higher torque than the first stage speed reducer side, the planetary roller speed reducer 1 on the second stage speed reducer side is replaced with the planetary roller on the first stage speed reducer side. It is also possible to increase the transmission torque capacity by making it larger than the reduction gear 1.
Other configurations are the same as those of the first embodiment, and the same members are denoted by the same reference numerals.

FIG. 4 is a sectional view taken along the input axis of the planetary roller speed reducer according to the third embodiment of the present invention. FIG. 5 shows the configuration of the torque cam mechanism in the third embodiment, wherein (A) is a schematic side view, and (B) is a sectional view taken along line BB in (A).
In the third embodiment shown in FIGS. 4 to 5, the planetary roller speed reducer 1 includes a sun roller 31 and a plurality of planetary rollers 32 in a truncated cone shape, and the inner surface of the inner roller 33 is formed on the planetary planetary roller. A conical roller planetary roller speed reducer formed on a conical inner surface that can come into contact with the conical outer surface of the roller 32 is configured.
That is, 3 is a conical roller planetary roller speed reducer, 14 is an input shaft, 31 is a conical sun roller fixed to the input shaft 14, and 13 is an annular shape having a conical inner surface fixed to a case 13 z. An inner roller 16 is an output shaft, and 15 is a carrier fixed to the output shaft 16. 17 is a plurality of planet pins fixed to the carrier 15 at equal intervals in the circumferential direction (four in this example), and 12 is a conical shape rotatably supported on each planet pin 17 via a bearing (not shown). Is a planetary roller.

Reference numeral 5 denotes a known torque cam mechanism interposed on the input shaft 14, and reference numeral 4 denotes a bearing for supporting the input shaft 14 on the case 13z. The bearing 4 is a bearing capable of supporting a thrust load such as a tapered roller bearing as in this embodiment. Reference numeral 140 denotes an input axis.
The torque cam mechanism 5 is interposed between a loading cam 51 and a support case 54 via a cam roller 52 supported by a cage 53 so as to be able to roll along the circumferential direction with a radius Rm (four in this example). In addition, by changing the rotation angle of the loading cam 51, a thrust load F is generated in the axial direction of the input shaft 14, and the magnitude of the thrust load F is controlled.

Returning to FIG. 4, the thrust load F generated by the torque cam mechanism 5 acts on the sun roller 31 of the conical roller planetary roller speed reducer 3 as indicated by the arrow in the figure, and the sun roller 31 to the planetary roller. A pressure contact force presses the rollers between the inner rollers 33 and the inner rollers 33, and the bearing 4 takes charge of the reaction force of the pressure contact force.
Therefore, by changing the rotation angle of the loading cam 51, the pressure contact force that presses the rollers can be adjusted, and the rotational force transmitted from the sun roller 31 side to the carrier 35 side can be controlled.

FIG. 6 is a cross-sectional view along the input axis of the planetary roller speed reducer according to the fourth embodiment of the present invention.
In the fourth embodiment shown in FIG. 6, the planetary roller speed reducer 1 includes a sun roller 31 and a plurality of planetary rollers 32 in the shape of a truncated cone as in the third embodiment (FIG. 4). In addition, the inner surface of the inner roller 33 is formed as a conical roller type planetary roller speed reducer 3 formed on a conical inner surface that can come into contact with the conical outer surface of the planetary roller 32, and the torque cam mechanism 5 in the third embodiment is formed. Instead of this, a hydraulic cylinder device 6 for applying a thrust load F to the bearing 4 is provided.
That is, in FIG. 6, 6 is a hydraulic cylinder device, and a piston is fitted in a cylinder 61 so as to be able to reciprocate. A connecting tool connected to the bearing 4 is fixed to the end of the piston 62. 65 is a hydraulic drive device, and the hydraulic pressure applied to the piston 62 of the hydraulic cylinder device 6 is changed by the hydraulic drive device 65. The hydraulic cylinder device 6 is provided at a plurality of locations in the circumferential direction of the bearing 4 and applies a thrust load F to the bearing 4.

In such a fourth embodiment, when hydraulic pressure is applied to the piston 62 by the hydraulic drive device 65, the thrust load F applied to the bearing 4 by the hydraulic pressure is reduced by the conical roller planetary roller as indicated by the arrow in the figure. Acting on the sun roller 31 of the machine 3, it becomes a pressure contact force that presses each roller between the sun roller 31 to the planetary roller 32 to the inner roller 33.
By changing the hydraulic pressure acting on the piston 62 by the hydraulic drive device 65, the thrust load F and the pressure contact force that presses each roller are adjusted, and the rotational force transmitted from the sun roller 31 side to the carrier 35 side. Can be controlled.
Other configurations are the same as those of the third embodiment, and the same members are denoted by the same reference numerals.

FIG. 7 is a side view of an essential part of a planetary roller speed reducer according to a fifth embodiment of the present invention.
In the fifth embodiment shown in FIG. 7, the inner roller 13 of the planetary roller speed reducer 1 in the first embodiment (FIG. 1) is configured as an elastic inner roller 130 made of an elastic material such as spring steel, and the elasticity An axial load F is applied to the side portion of the inner roller 130 to generate a pressure contact force that presses each roller between the sun roller 11 to the planetary roller 12 to the elastic inner roller 130.
And in this 5th Example, by changing the said axial load F, the press-contact force which press-contacts each said roller is adjusted, and the rotational force transmitted to the carrier 15 side from the sun roller 11 side is controlled. be able to.
The other structure is the same as that of the planetary roller speed reducer 1 in the first embodiment (FIG. 1), and the same members are denoted by the same reference numerals.

  According to the third to fifth embodiments described above, since the rotational force is transmitted by the surface contact of the roller, the planetary roller speed reducer 1 (or 3) that is quiet in operation even at high speed rotation can be provided with vibration, A configuration in which a conical roller type planetary roller speed reducer 3 and a torque cam mechanism 5 are combined (third embodiment), a conical roller type planetary roller speed reducer 3, a thrust load, and the thrust load can be performed while suppressing noise. A configuration in which a hydraulic cylinder device 6 is adjusted (fourth embodiment), and the inner roller is deformed in the radial direction by a change in axial load to change the pressure contact force with the planetary roller 12. By providing the configuration of 130 (the fifth embodiment), the rotational force transmitted from the sun roller 11 (or 31) side to the carrier 15 (or 35) side is set to the target rotation. It is possible to control the force, can prolong the life of the device.

FIG. 8 is a side view of an essential part of a planetary roller speed reducer according to a sixth embodiment of the present invention.
In the sixth embodiment shown in FIG. 8, the outer diameter side of the inner roller 13 of the planetary roller speed reducer 1 in the first embodiment (FIG. 1) is configured as a worm wheel 61a so that the inner roller 13 can rotate. A worm 61 meshing with the worm wheel 61a and a worm rotation control device 62 for controlling the rotation of the worm 61 are provided.
In the sixth embodiment, by changing the rotation of the worm 61 by the worm rotation control device 62 and adjusting the rotation of the inner roller 13 via the worm wheel 61 meshing with the worm 61, The rotation ratio between the input shaft 14 and the sun roller 11 side and the carrier 15 and the output shaft 16 side is changed.
The other structure is the same as that of the planetary roller speed reducer 1 in the first embodiment (FIG. 1), and the same members are denoted by the same reference numerals.

According to the sixth embodiment, the rotation of the worm 61 is changed by the worm rotation control device 62, and the rotation of the inner roller 13 formed on the outer diameter side of the worm wheel 61a is changed. The continuously variable transmission of the carrier 15 on the output shaft 16 side can be changed, thereby forming a continuously variable transmission that can freely change the rotation speed ratio, that is, the reduction ratio between the input shaft 14 side and the output shaft 16 side. It becomes possible.
Accordingly, the engine or motor constituting the drive source 31 is operated at a constant rotational speed, and the planetary roller speed reducer 1 is moved relative to the inner roller 13 and the output shaft side carrier 15 by the worm rotation control device 62 as described above. By using a continuously variable transmission that changes the rotational speed, the engine or motor can be operated at a constant rotational speed at the highest efficiency point.

  ADVANTAGE OF THE INVENTION According to this invention, especially in the forklift which uses an electric motor as a drive source, the power transmission device of the forklift which can fully reduce a vibration and noise to such an extent that environmental regulation is cleared can be provided.

It is a plane lineblock diagram of a reduction device of a forklift concerning the 1st example of the present invention. It is a plane block diagram (the left half of the rotating shaft center of a drive source is shown) of the reduction device of the forklift truck concerning 2nd Example of this invention. An example of the planetary roller speed reducer applied to this invention is shown, (A) is sectional drawing in alignment with an input shaft center, (B) is the sectional view on the AA line in (A). It is sectional drawing in alignment with the input shaft center of the planetary roller speed reducer which concerns on 3rd Example of this invention. The structure of the torque cam mechanism in the said 3rd Example is shown, (A) is a schematic side view, (B) is BB sectional drawing in (A). It is sectional drawing which follows the input shaft center of the planetary roller speed reducer which concerns on 4th Example of this invention. It is a principal part side view of the planetary roller speed reducer which concerns on 5th Example of this invention. It is a principal part side view of the planetary roller speed reducer which concerns on 6th Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Planetary roller speed reducer 2 Gear speed reducer 3 Conical roller type planetary roller speed reducer 4 Bearing 5 Torque cam mechanism 6 Hydraulic cylinder device 11, 31 Solar roller 12, 32 Planetary roller 13, 33 Inner roller 14 Input shaft 15, 35 Carrier 16 Output Shaft 17 Planetary pin 21 Small gear (pinion gear)
22 Large gear 25 Axle 26 Wheel 30 Differential device 31 Drive source 61 Worm 61a Worm wheel 62 Worm rotation control device 130 Elastic inner roller

Claims (8)

  A power transmission device for a forklift configured to decelerate a rotational force from a drive source such as an engine or a motor at a predetermined reduction ratio by a reduction device and drive a wheel connected to an output shaft of the reduction device, The speed reducer is equidistant in the circumferential direction between the outer periphery of the sun roller fixed to the input shaft connected to the drive source side and the inner periphery of the annular inner roller via a planetary pin and a bearing. A planetary roller supported by the motor, and a planetary roller speed reducer that decelerates the rotational force from the driving source at a predetermined reduction ratio and outputs the reduced speed to an output shaft connected to the carrier or the inner roller. A speed reducer and an input shaft are connected to the output shaft of the planetary roller speed reducer, and the rotational force from the planetary roller speed reducer is decelerated at a predetermined reduction ratio and output to the output shaft connected to the wheel side. With a two-stage reducer A power transmission device for a forklift according to claim.   A gear reduction comprising a gear train having a second gear fixed to an input shaft connected to the planetary roller speed reducer and a large gear fixed to an output shaft connected to the wheel side. 2. The power transmission device for a forklift according to claim 1, wherein the power transmission device is a machine.   The second stage speed reducer is connected to a carrier via a planetary pin and a bearing between an outer periphery of a sun gear fixed to an input shaft connected to the planetary roller speed reducer and an inner periphery of an annular internal gear. A planetary gear reducer that is provided with planetary gears supported at equal intervals in the circumferential direction, and that reduces the rotational force from the input shaft at a predetermined reduction ratio and outputs it to the output shaft connected to the carrier or the internal gear. The power transmission device for a forklift according to claim 1, wherein the power transmission device is configured.   The second stage speed reducer is connected between the outer periphery of the sun roller fixed to the input shaft connected to the planetary roller speed reducer and the inner periphery of the annular inner roller via a planetary pin and a bearing. A planetary roller speed reducer which is provided with planetary rollers supported at equal intervals in the circumferential direction and which decelerates the rotational force from the input shaft at a predetermined reduction ratio and outputs it to the output shaft connected to the carrier or the inner roller. The power transmission device for a forklift according to claim 1, wherein the power transmission device is configured.   In the planetary roller speed reducer, the sun roller and the plurality of planetary rollers are configured as a truncated cone-shaped roller, and the inner surface of the inner roller is formed on a conical inner surface that can come into contact with the conical outer surface of the planetary roller. A conical roller planetary roller speed reducer, and the transmission force acting on the contact surface between the sun roller, the planetary roller and the inner roller is changed on the input shaft to which the sun roller is fixed. 2. The power transmission device for a forklift according to claim 1, further comprising a torque cam mechanism for changing a rotational force transmitted to the forklift.   In the planetary roller speed reducer, the sun roller and the plurality of planetary rollers are configured as a truncated cone-shaped roller, and the inner surface of the inner roller is formed on a conical inner surface that can come into contact with the conical outer surface of the planetary roller. The conical roller planetary roller speed reducer is configured, and the bearing that supports the input shaft to which the sun roller is fixed is configured as a bearing having a thrust capacity, and the thrust load is applied to the bearing and the thrust load is adjusted. A transmission force acting on contact surfaces of the sun roller, the planetary roller, and the inner roller by changing a thrust load of the input shaft and the sun roller via the bearing by the hydraulic cylinder device. 2. The structure according to claim 1, wherein the rotational force transmitted from the sun roller side to the carrier is changed. Power transmission device of the forklift.   The planetary roller speed reducer includes an elastic ring that couples an output shaft to the carrier and that deforms the inner roller in a radial direction by a change in axial load to change a pressure contact force with the planetary roller. 2. The power transmission device for a forklift according to claim 1, wherein the rotational force transmitted from the sun roller side to the carrier can be changed by changing the axial load. The planetary roller speed reducer includes an output shaft connected to the carrier, and the outer diameter side of the inner roller is configured as a worm wheel so as to be rotatable, and the worm meshing with the worm wheel and the worm for controlling the rotation of the worm A rotation control device is provided, and the rotation ratio of the input shaft side and the output shaft side is changed by adjusting the rotation of the inner roller through the worm wheel by changing the rotation of the worm by the worm rotation control device. The power transmission device for a forklift according to claim 1, wherein

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