CN110268176B

CN110268176B - Flexible transmission device

Info

Publication number: CN110268176B
Application number: CN201780074464.9A
Authority: CN
Inventors: 吴谞冠
Original assignee: Individual
Current assignee: Individual
Priority date: 2016-12-12
Filing date: 2017-11-23
Publication date: 2021-06-08
Anticipated expiration: 2037-11-23
Also published as: CN110268176A; WO2018107948A1

Abstract

A flexible transmission device (1) comprises a flexible shaft (2) and a flexible shaft outer sleeve (3), wherein the flexible shaft (2) comprises a plurality of rotary joints (21) and a plurality of universal joints (22). A plurality of rotary joints (21) and a plurality of universal joints (22) are connected in series in the flexible shaft (2); the flexible shaft outer sleeve (3) is sleeved outside the flexible shaft (2), and the rotary joint (21) is tightly matched with the flexible shaft outer sleeve (3) in a shaft hole. The flexible transmission device has the advantages of large transmission torque, long service life and more stable transmission.

Description

Flexible transmission device

Technical Field

The invention relates to a transmission mechanism, in particular to a flexible transmission mechanism.

Background

The existing flexible shaft is divided into 3 types, namely a winding type flexible shaft, a universal shaft joint type flexible shaft and a spring type flexible shaft; the winding type flexible shaft consists of a steel wire (or steel belt) shaft, a hose and a shaft joint. The steel wire shaft is formed by winding 4-10 layers of high-carbon steel wires, the outermost layer is generally left-handed, the torque is mainly borne by the layer, and the layer can be wound tightly to be reasonable (forward rotation) due to the steering of the shaft; the torque of the positive rotation can only be carried about 15% when the rotation is reversed.

The universal-joint flexible shaft is formed by connecting a plurality of shaft joints, such as a ball tube shaft joint and a column fork shaft joint.

The spring-type flexible shaft is a long cylindrical helical spring, one end of which is provided with various tools for different operations, and the shaft does not need a hose.

Disclosure of Invention

The invention aims to provide a flexible transmission device which is large in transmission torque and long in service life.

A flexible drive according to an aspect of the present invention includes a flexible shaft including a universal joint; the flexible transmission device also comprises a flexible shaft outer sleeve; the flexible shaft further comprises a rotational joint; a plurality of said rotary joints and a plurality of said universal joints are connected in series in said flexible shaft; the flexible shaft outer sleeve is sleeved on the outer side of the flexible shaft, and the rotary joint is in shaft hole tight fit with the flexible shaft outer sleeve.

According to another aspect of the invention, the high-torque flexible transmission mode and the high-torque flexible transmission device comprise a driving wheel and a driven wheel, the driving wheel and the driven wheel at two ends in a flexible shaft outer sleeve are connected with a rotary joint through a plurality of universal joints, the universal joints are connected with a shaft on the rotary joint, and a bearing outer ring on the rotary joint is connected with the flexible shaft outer sleeve.

According to one embodiment of the invention, the shaft of the rotary joint is connected to rotate in the opposite direction to the outer ring of the rotary joint.

According to an embodiment of the present invention, two flexible shafts may be juxtaposed to rotate in opposite directions.

Brief description of the drawings

The specific features and properties of the present invention are further illustrated by the following examples and their drawings.

FIG. 1 is a perspective view of a flexible drive according to the present invention;

FIG. 2 is a front view of a flexible shaft of the flexible drive of FIG. 1;

FIG. 3 is a perspective view of a flexible shaft of the flexible drive of FIG. 1;

FIG. 4 is a perspective view of a rotational joint of the flexible shaft shown in FIG. 3;

FIG. 5 is a perspective view of the universal joint of the flexible shaft shown in FIG. 3;

FIG. 6 is a side view of an alternate embodiment of the rotational joint of the flexible shaft shown in FIG. 3;

fig. 7 is a perspective view of another flexible drive according to the present invention.

Fig. 8 is a perspective view of a flexible shaft of another flexible transmission according to the present invention.

FIG. 9 is a side view of a modified embodiment of the rotational joint of the flexible shaft shown in FIG. 3.

Best mode for carrying out the invention

According to the best embodiment of the invention, the universal flexible shaft is convenient to mount, compact in structure, low in rotating speed, large in torque, good in driving stability and capable of transmitting motion and power in a longer distance.

The embodiment of the invention provides a large-torque flexible transmission mode and a large-torque flexible transmission device, which comprise a flexible shaft outer sleeve, a driving wheel and a driven wheel, wherein the driving wheel is connected with external power input, the driven wheel is connected with power output, a plurality of flexible transmission parts are fixedly connected between the driving wheel and the driven wheel, each flexible transmission part is formed by fixedly connecting a universal joint (shown in a figure 5) and a rotary joint (shown in a figure 4), and a bearing outer ring on each rotary joint is fixedly connected with the flexible shaft outer sleeve.

According to one aspect of the invention, the rotary joint is formed by fixedly connecting a bearing and a shaft, and an outer ring of the bearing is fixedly connected with a flexible shaft outer sleeve. The bearing can select various rolling bearings and sliding bearings according to requirements.

According to the embodiment of the aspect of the invention, the universal joint is fixedly connected with the shaft on the rotary joint, the universal joint can adapt to bending, and the flexibility is larger as the number of joints is larger. The universal joint can be a part (figure 5) formed by combining two flexible elastic sheets, and various types of rigid universal joints and flexible universal joints can be selected according to requirements.

According to an embodiment of the aspect of the invention, the flexible shaft outer sleeve can be a rubber hose, a metal hose and the like, and the flexible shaft outer sleeve can achieve the shock absorption effect.

The rotary joint in the embodiment according to an aspect of the present invention may also be a coaxial and reverse rotary joint (fig. 6), and the rotation direction of the shaft fixedly connected with the sun gear is opposite to that of the planet carrier, so that the instability of power transmission caused by the rotation torque can be overcome.

According to an embodiment of one aspect of the present invention, as shown in fig. 1 and 3, a shaft on a driving wheel connected with an external power input is fixedly connected with a universal joint in a flexible shaft jacket, the universal joint is fixedly connected with a shaft on a rotary joint, the shaft on the rotary joint is fixedly connected with a bearing, a needle bearing outer ring on the rotary joint is fixedly connected with the flexible shaft jacket, the number of the rotary joint and the universal joint is determined according to the length requirement, and finally the universal joint is fixedly connected with a driven wheel at a power output end.

According to the implementation mode of one aspect of the invention, two flexible shafts (figure 1) can be used for transmitting power in parallel (figure 7), external power is input to the two flexible shafts respectively through gear combination, and internal mechanisms of the two flexible shafts rotate reversely to transmit power, so that reaction torque is overcome, and transmission stability is maintained.

According to an embodiment of one aspect of the invention, a shaft on a driving wheel connected with external power input is fixedly connected with a universal joint in a flexible shaft outer sleeve, the universal joint is fixedly connected with a shaft on a coaxial reverse rotation joint (figure 6), sun teeth on the coaxial reverse rotation joint (figure 6) are fixedly connected with the shaft, a needle bearing outer ring on an external planet carrier of the coaxial reverse rotation joint (figure 6) is fixedly connected with the flexible shaft outer sleeve, the number of the connection between the rotation joint and the universal joint is determined according to the length requirement, and finally the universal joint is fixedly connected with a driven wheel of a power output end. The coaxial counter-rotating rotary joint (fig. 6) can overcome the reaction torque and maintain the stability of transmission.

According to an embodiment of one aspect of the invention, different types of universal joints and rotary joints are selected according to the transmission requirements of different occasions. The universal joint can be a cross shaft type, a quasi constant velocity universal joint, a constant velocity universal joint and the like. The rotary joint can adopt various types of rolling bearings such as a joint bearing and a sliding bearing. The rotary joint can also adopt a coaxial reverse rotary joint to better overcome the reaction torque.

Fig. 1 to 5 show an embodiment of the present invention, and as shown in fig. 1 to 5, a flexible transmission 1 includes a flexible shaft 2 and a flexible shaft outer casing 3. The flexible shaft 2 includes a plurality of universal joints 22 and a plurality of rotary joints 21, and the plurality of universal joints 22 and the plurality of rotary joints 21 are connected in series, and the connection mode may be, but is not limited to, a mode in which one universal joint is staggered with one rotary joint, a mode in which one universal joint is staggered with two rotary joints, or a mode in which two universal joints are staggered with one rotary joint. In addition, a driving member for receiving external input power and a driven member for outputting power to the outside may be connected to both ends of the flexible shaft 2, respectively, and the driving member and the driven member are not shown in the drawings and may be a rotating shaft, a rotating wheel or other structural members. The flexible shaft outer sleeve 3 is sleeved on the outer side of the flexible shaft 2, as shown by dotted lines in fig. 1, the rotary joint 21 and the flexible shaft outer sleeve 3 are in shaft hole tight fit, namely the flexible shaft outer sleeve 3 is tightly sleeved on the rotary joint 21, the flexible shaft outer sleeve 3 has flexibility, the rotary joint 21 plays a supporting role for the flexible shaft outer sleeve 3, the flexible transmission device can be very long, and the flexible shaft 2 can have longer service life and more stable transmission due to the wrapping of the flexible shaft outer sleeve 3.

As shown in fig. 4, the rotary joint 21 includes a central shaft 212 and a bearing 210, and in the illustrated embodiment, the bearing 210 is a needle bearing, but is not limited thereto, and the bearing 210 may be a rolling bearing of different types, a sliding bearing, or an oil bearing according to different occasions. The flexible shaft jacket 3 is sleeved on the outer ring of the bearing 210, is tightly matched with the outer ring and is supported by the outer ring.

As shown in FIG. 5, the universal joint 22 may be a different type of universal joint, such as a rigid universal joint or a flexible universal joint, preferably a flexible universal joint, selected for different applications to enhance smooth performance during driving.

The flexible shaft jacket 3 can be a rubber hose and a metal hose, has certain elasticity and thickness and can play a role in shock absorption.

Fig. 6 and 8 show another embodiment of the present invention in which the rotary joint is different in structure from the foregoing. The rotary joint 23 includes a central shaft 231 and a bearing, a planetary gear transmission mechanism is disposed between the shaft 231 and the bearing, as shown in fig. 6, the bearing includes an inner ring 235 and an outer ring 236, and a rolling body 233 located between the inner ring 235 and the outer ring 236, the inner ring 235 is an inner ring gear, a plurality of planetary gears 232 and a sun gear 234 are further disposed in the inner ring 235, the sun gear 234 is sleeved on the central shaft 231, an outer peripheral side of the sun gear 234 is engaged with the plurality of planetary gears 232, and an inner peripheral side of the inner ring 235 is engaged with the plurality of planetary gears 232, so that the inner ring 235 and the rotating shaft 231 are associated with each other in a counter. The inner ring 235 and the outer ring 236 of the bearing may be held for relative rotation by rolling elements, or may be free of rolling elements, for example, the outer ring 235 may be a sliding bearing or an oil-impregnated bearing. The shaft 231 rotates in the opposite direction to the inner race 235, thereby allowing the flexible transmission to transmit more smoothly. In fig. 8 the gimbal is a cross-member type rigid gimbal 24, which, as previously mentioned, may be replaced by other types of gimbal. The power input end or the power output end is connected with the central shaft 231 or the inner ring 235 to realize speed increasing or reducing.

In another embodiment, a rotary joint includes an outer ring and a reversing mechanism, the reversing mechanism including a first rotating portion and a second rotating portion that are coaxially disposed and are associated with each other in opposite directions of rotation, the outer ring being a fixed body that is fitted around the outside of the reversing mechanism. Since the first rotating part and the second rotating part rotate in opposite directions, the flexible transmission device can transmit power smoothly.

Fig. 7 shows another embodiment of the present invention, in which the flexible shafts 1A, 1B each having a flexible shaft outer casing are juxtaposed, and the flexible shaft outer casings outside the adjacent flexible shafts are in contact with each other and associated in such a manner as to rotate in opposite directions to each other, so that the flexible transmission apparatus can transmit smoothly since the flexible shaft outer casings of the adjacent flexible shafts are in contact with each other and rotate reversely.

Fig. 9 shows another embodiment of the present invention, wherein the rotary joint includes an inner bearing 4 and an outer bearing 5, the outer bearing 5 is sleeved on the outer periphery of the inner bearing 4, the outer ring 41 of the inner bearing 4 and the inner ring 52 of the outer bearing 5 can be connected through a gear structure, or the outer ring 41 and the inner ring 52 can be a same ring body, and the shaft and the outer ring of the bearing respectively connected to the inner bearing and the outer bearing can rotate in opposite directions, so as to overcome the reaction torque and maintain the transmission stability.

Claims

1. A flexible drive comprising:

a flexible shaft comprising a universal joint;

it is characterized in that the preparation method is characterized in that,

the flexible transmission device also comprises a flexible shaft outer sleeve;

the flexible shaft further comprises a rotational joint;

a plurality of said rotary joints and a plurality of said universal joints are connected in series in said flexible shaft;

the flexible shaft outer sleeve is sleeved on the outer side of the flexible shaft, and the rotary joint is in shaft hole tight fit with the flexible shaft outer sleeve.

2. The flexible transmission device according to claim 1, wherein the rotary joint includes a bearing connecting the central shaft and the central shaft, and the flexible shaft sleeves are sleeved on outer rings of the bearing and are tightly fitted with the shaft holes.

3. The flexible transmission device according to claim 1, wherein the rotary joint includes a bearing, a central shaft, and a planetary gear mechanism including a sun gear, a planetary gear, and an inner gear ring, the central shaft is connected to the planetary gear, the bearing includes an outer ring and an inner ring that are relatively rotatable, the inner ring is sleeved on the outer ring of the inner gear ring, the flexible shaft is sleeved on the outer ring of the bearing, and the flexible shaft and the outer ring are tightly fitted with each other via the shaft holes.

4. The flexible drive of claim 1, wherein the flexible shaft jacket is a rubber hose or a metal hose.

5. The flexible drive of claim 1, wherein the gimbal is a rigid gimbal or a flexible gimbal.

6. The flexible drive of claim 1, wherein the revolute joint comprises an outer race and a reversing mechanism, the reversing mechanism comprising a first rotating portion and a second rotating portion, the first rotating portion and the second rotating portion being coaxially disposed and being associated with each other in opposite directions of rotation, the outer race being a fixed body that is fitted over the reversing mechanism.

7. The flexible drive of claim 1, wherein said flexible shafts each having said flexible shaft outer sleeves are juxtaposed, and said flexible shaft outer sleeves outside adjacent flexible shafts are in contact with each other and associated in counter-rotating relation to each other.

8. The flexible drive of claim 1, wherein the flexible drive is disposed in a sunroof opening mechanism, a car seat adjustment mechanism, a car clutch, a brake pedal and lever, a trunk, a door lock, or a window lifter.

9. The flexible drive of claim 1, wherein a plurality of said rotary joints and a plurality of said universal joints are staggered in tandem.

10. The flexible drive of claim 1, further comprising:

a driving member receiving an external input power; and

a driven member for outputting power to the outside;

the driving piece and the driven piece are connected in series through a plurality of rotary joints and a plurality of universal joints.