CN113757351B

CN113757351B - Integrated gear shifting structure and elbow joint

Info

Publication number: CN113757351B
Application number: CN202110909619.4A
Authority: CN
Inventors: 吴衍傧; 黄沿江; 高婷钰; 黄狄伟; 邢昕铨; 何滢政; 罗新龙
Original assignee: South China University of Technology SCUT
Current assignee: South China University of Technology SCUT
Priority date: 2021-08-09
Filing date: 2021-08-09
Publication date: 2022-10-25
Anticipated expiration: 2041-08-09
Also published as: CN113757351A

Abstract

The invention discloses an integrated gear shifting structure and an elbow joint, wherein the integrated gear shifting structure comprises an inner gear ring, a bracket and a gear shifting cam, wherein a tooth part is arranged on the inner wall of the inner gear ring along the circumferential direction; the periphery of the support abuts against the inner wall of the inner gear ring, the support comprises two support plates, an installation space is formed between the two support plates, gear mechanisms are movably installed in the installation space, and each gear mechanism is connected with the support through an elastic element; the gear shifting cam is rotatably installed in the installation space, the gear shifting mechanism is arranged around the gear shifting cam along the circumferential direction, and the gear shifting cam rotates to push out any one gear shifting mechanism to abut against the inner gear ring. Different gear mechanisms can be ejected out through the rotation of the gear shifting cam to be in contact with the inner gear ring so as to realize the switching of different gears, the abrasion generated inside is low, the integral use stability is good, and the service life is long. The bracket can not only protect the stable shift, but also facilitate the replacement or maintenance of the components therein; in addition, the bracket is abutted in the inner gear ring, so that the integral structure is more compact and the installation is easy.

Description

Integrated gear shifting structure and elbow joint

Technical Field

The invention relates to an integrated gear shifting structure and an elbow joint in the field of exercise assisting devices.

Background

With the continuous development of the science and technology level of society, the man-machine cooperation also develops and progresses towards the direction of intellectualization, wherein the application of the gear shifting mechanism is not neglected. The gear shifting mechanism is most commonly used in the field of automobile driving, and aims to continuously change the position of a gear lever along with different conditions so as to switch different gear functions. In this kind of gearshift, in order to realize the switching of different fender position, need many transmission shaft combined action, overall structure is bulky, needs part quantity numerous, can't satisfy under the practical application scene, realizes the demand that the many gears of small-size equipment switched. And the gear shifting mechanism on the general market adopts manual control, and the required operating procedure of shifting is loaded down with trivial details, and the degree of difficulty is big, has proposed higher requirement to the hand operation on the user's entry, also influences the safety of mechanical use. In the field of elbow power assisting mechanism research, the problem that a user is difficult to bear a power assisting device with larger weight and larger volume due to the defect of elbow power generation or insufficient power generation exists.

Disclosure of Invention

The invention aims to solve at least one of the technical problems in the prior art and provides an integrated gear shifting structure and an elbow joint, which are small in size and easy to operate.

According to an embodiment of a first aspect of the invention, an integrated gear shifting structure is provided, which comprises an inner gear ring, wherein the inner wall of the inner gear ring is provided with a tooth part along the circumferential direction; the peripheral side of the bracket abuts against the inner wall of the inner gear ring, the bracket comprises two support plates which are detachably connected, an installation space is formed between the two support plates, at least two gear mechanisms are movably installed in the installation space, and each gear mechanism is connected with the bracket through an elastic element; the gear shifting cam is rotatably installed in the installation space, the gear mechanisms are circumferentially arranged around the gear shifting cam, and the gear shifting cam rotates to push any one gear mechanism to abut against the inner gear ring.

According to the embodiment of the first aspect of the present invention, further, at least two gear mechanisms are respectively a forward gear mechanism and a reverse gear mechanism, each of the forward gear mechanism and the reverse gear mechanism includes a gear lever, an inclined surface is formed at an end of the gear lever close to the inner gear ring, and the inclined surface of the gear lever of the forward gear mechanism is opposite to the inclined surface of the gear lever of the reverse gear mechanism in direction.

According to the embodiment of the first aspect of the present invention, further, the shift lever includes a lever body and a shift position member, the shift position member is fixed at an end of the shift position, the inclined surface is located on the shift position member, and the shift position member is detachably connected to the lever body.

According to an embodiment of the first aspect of the present invention, further, at least one of the gear mechanisms is a damping gear mechanism, the damping gear mechanism includes a damping rod and a damping member fixed at an end of the damping rod, and the damping member is configured to abut against an inner wall of the ring gear.

According to an embodiment of the first aspect of the invention, further, at least one gear mechanism is a brake gear mechanism, and the brake gear mechanism comprises a brake lever and a brake member, and the brake member is used for being clamped into a tooth groove of the inner gear ring.

According to the embodiment of the first aspect of the present invention, further, at least two notches are arranged on the circumferential side of the bracket, the number of the notches corresponds to the number of the gear mechanisms one by one, and each gear mechanism is located in the corresponding notch.

According to the embodiment of the first aspect of the present invention, further, at least two limiting structures are disposed in the installation space, the limiting structures correspond to the notches one to one, each limiting structure includes two limiting members, a telescopic channel is formed between the two limiting members, and the gear mechanism is slidably installed in the telescopic channel.

According to an embodiment of the first aspect of the present invention, further, the elastic element includes two elastic members, the two elastic members are symmetrically located at two sides of the shift position mechanism, one end of each elastic member is connected to the bracket, and the other end of each elastic member is connected to the shift position mechanism.

According to an embodiment of the second aspect of the invention, a toggle joint is provided, which comprises the integrated gear shifting structure.

The invention has the beneficial effects that: different gear mechanisms can be ejected out through the rotation of the gear shifting cam to be in contact with the inner gear ring so as to realize the switching of different gears, the abrasion generated inside is low, the integral use stability is good, and the service life is long. The bracket can not only protect the stable shift, but also facilitate the replacement or maintenance of the components therein; in addition, the bracket is abutted in the inner gear ring, so that the integral structure is more compact and the installation is easy.

Drawings

In order to more clearly illustrate the technical solution in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is clear that the described figures are only some embodiments of the invention, not all embodiments, and that a person skilled in the art can also derive other designs and figures from them without inventive effort.

FIG. 1 is a schematic structural diagram of an integrated shifting structure in an embodiment of the invention;

FIG. 2 is a front view of an integrated shift structure in an embodiment of the present invention;

FIG. 3 is a schematic view of the shift output shaft and motor of an embodiment of the present invention;

fig. 4 is a schematic structural view of an elbow joint in an embodiment of the present invention.

Detailed Description

Reference will now be made in detail to the present embodiments of the present invention, preferred embodiments of which are illustrated in the accompanying drawings, wherein the drawings are provided for the purpose of visually supplementing the description in the specification and so forth, and which are not intended to limit the scope of the invention.

In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless otherwise specifically limited, terms such as set, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention by combining the specific contents of the technical solutions.

Referring to fig. 1 to 3, the integrated shift structure 100 in the first embodiment of the present invention includes an annular gear 70, a bracket 10, and a shift cam 20, and a circumferential side of the bracket 10 abuts against an inner wall of the annular gear 70, so that the structure is simplified and the mounting is easy. Alternatively, the shift cam 20 is formed on a shift output shaft, which is connected to the output of the electric motor. The inner wall of the inner gear ring 70 is circumferentially provided with a tooth part, the support 10 is movably provided with at least two gear mechanisms, each gear mechanism is connected with the support 10 through an elastic element, the gear shifting cam 20 is rotatably arranged on the support 10, the gear mechanisms are circumferentially arranged around the gear shifting cam 20, and the gear shifting cam 20 rotates to push out any gear mechanism to abut against the inner gear ring 70. The shift cams 20 rotate to push out any one of the gear mechanisms to be engaged with the inner wall or the tooth portion of the ring gear 70, so that the torques of different gears can be output.

In an embodiment, the at least two gear mechanisms are a forward gear mechanism 301 and a reverse gear mechanism 302, the forward gear mechanism 301 and the reverse gear mechanism 302 each include a gear lever, an end of the gear lever near the ring gear 70 forms an inclined surface, and the inclined surface of the gear lever of the forward gear mechanism 301 is opposite to the inclined surface of the gear lever of the reverse gear mechanism 302. By pushing out the forward-gear mechanism 301 or the reverse-gear mechanism 302 to engage with the ring gear 70, torque in different directions is output. Taking the forward gear mechanism 301 as an example for illustration, when the gear shift cam 20 rotates to push out the forward gear mechanism 301, the end of the gear lever is pushed out into the tooth socket embedded in the tooth part to be engaged with the tooth part, and the inner gear ring 70 cannot rotate reversely under the action of the inclined plane, so that unpowered gear shift is avoided under the condition that a user does not know; the reverse gear mechanism 302 is the same. In this application, the gear lever slope of forward gear mechanism 301 is opposite to the gear lever slope of reverse gear mechanism 302, including the following two specific cases: 1. the gear lever bevel of the forward gear mechanism 301 faces clockwise, and the gear lever bevel of the reverse gear mechanism 302 faces counterclockwise; 2. the shift lever slope of the forward shift position mechanism 301 faces counterclockwise, and the shift lever slope of the reverse shift position mechanism 302 faces clockwise.

Further, the gear lever comprises a lever body 32 and a gear part 31, the gear part 31 is fixed at the end of a gear, the inclined surface is located on the gear part 31, and the gear part 31 is detachably connected with the lever body 32. The shift position member 31 is facilitated to be replaced when the inclined surface is worn. The end of the rod 32 is provided with a slot, and the outer side of the gear 31 is provided with a step, so that when the gear 31 is inserted into the slot, the shoulder of the step can be abutted against the top surface of the slot, thereby limiting the gear 31 from penetrating into the slot.

In one embodiment, at least one gear mechanism is a damping gear mechanism 40, and the damping gear mechanism 40 includes a damping rod 42 and a damping member 41 fixed to an end of the damping rod 42, the damping member 41 being configured to abut against an inner wall of the ring gear 70. When the shift cam 20 pushes out the damping gear mechanism 40, the damping member 41 abuts against the inner wall of the ring gear 70, and a frictional force is generated between the damping member 41 and the ring gear 70, so that the rotational speed of the ring gear 70 is slowed down. Optionally, the damping member 41 is detachably connected to the damping rod 42.

In one embodiment, the at least one gear position mechanism is a brake gear position mechanism 50, and the brake gear position mechanism 50 includes a brake lever 52 and a brake member 51, and the brake member 51 is configured to be snapped into a tooth groove of the ring gear 70. When the gear shifting cam 20 pushes out the brake gear mechanism 50, the brake piece 51 extends into the tooth groove of the ring gear 70, so that the ring gear 70 is limited to rotate, and braking is realized. Alternatively, the brake member 51 is detachably connected to the brake lever 52.

In one embodiment, the bracket 10 includes two detachably connected brackets 11, the two brackets 11 forming a mounting space therebetween in which the shift mechanism and the shift cam 20 are mounted. The two stays 11 protect the operation of the gear mechanism and the shift cam from other components. It will be appreciated that the two brackets 11 have heretofore been connected by a plurality of bolt assemblies, and that the connection of the two brackets 11 could be removed by removing the bolt assemblies to mount or adjust the shift cam 20 and the respective shift mechanisms in the mounting control.

Further, the circumferential side of the bracket 10 is connected with the ring gear 70, and correspondingly, at least two notches are formed in the circumferential side of the bracket 10, and are used for accommodating the gear mechanism to be installed and extend out. The number of the notches corresponds to the number of the gear mechanisms one by one, and each gear mechanism is respectively positioned in the corresponding notch. In this embodiment, the number of the gear mechanisms is four, and accordingly, four notches are formed in the periphery of the bracket 10, the four notches are arranged at equal intervals, and the bracket 10 is cross-shaped.

Furthermore, be equipped with two at least limit structure in the installation space, limit structure and breach one-to-one, limit structure includes two locating parts 12, forms telescopic channel between two locating parts 12, and gear mechanism slidable mounting is in telescopic channel. Taking the forward gear position mechanism 301 as an example, when the forward gear position mechanism 301 extends and retracts, the rod 32 is slidably mounted in the telescopic channel and extends or retracts along the telescopic channel. Due to the limitation of the limiting member 12, when the forward gear mechanism 301 and the inner gear ring 70 rotate relatively, the rod body 32 does not rotate along with the inner gear ring 70, and the stability of the gear is ensured. Similarly, the damping lever 42 of the damping gear position mechanism 40 is mounted in the telescoping passage and the brake lever 52 of the brake position mechanism 50 is mounted in the telescoping passage. Alternatively, the limiting member 12 may be a bearing, which reduces the sliding friction between the limiting member 12 and the shift mechanism.

In one embodiment, the elastic element includes two elastic members 61, the two elastic members 61 are symmetrically located at two sides of the shift position mechanism, one end of the elastic member 61 is connected with the bracket 10, and the other end of the elastic member 61 is connected with the shift position mechanism. When the convex end of the shift cam 20 rotates away from the gear mechanism, the gear mechanism automatically retracts under the action of the elastic element and is not contacted with the inner gear ring 70 any more, so that the influence on the gear entering of the next gear is avoided. Because the two elastic members 61 are symmetrically positioned at two sides of the gear mechanism, the elastic force applied to the gear mechanism is balanced, and the left side and the right side of the telescopic channel relative to the sliding direction can not deviate.

Referring to fig. 4, the elbow joint in the second embodiment of the present invention includes the integrated shift structure 100 in any of the above embodiments.

While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that the present invention is not limited to the details of the embodiments shown and described, but is capable of numerous equivalents and substitutions without departing from the spirit of the invention as set forth in the claims appended hereto.

Claims

1. An integrated shifting structure, comprising:

the inner wall of the inner gear ring is circumferentially provided with a tooth part;

the gear shifting mechanism comprises a bracket, wherein the periphery of the bracket is abutted against the inner wall of the inner gear ring, the bracket comprises two support plates which are detachably connected, an installation space is formed between the two support plates, at least two gear shifting mechanisms are movably installed in the installation space, each gear shifting mechanism is connected with the bracket through an elastic element, at least two notches are arranged on the periphery of the bracket, the number of the notches corresponds to the number of the gear shifting mechanisms one by one, each gear shifting mechanism is respectively located in the corresponding notch, at least two limiting structures are arranged in the installation space, the limiting structures correspond to the notches one by one, each limiting structure comprises two limiting parts, a telescopic channel is formed between the two limiting parts, the gear shifting mechanisms are slidably installed in the telescopic channel, each elastic element comprises two elastic parts, the two elastic parts are symmetrically located on two sides of the gear shifting mechanism, one end of each elastic part is connected with the bracket, and the other end of each elastic part is connected with the gear shifting mechanism;

the gear shifting cam is rotatably installed in the installation space, the gear mechanisms are circumferentially arranged around the gear shifting cam, and the gear shifting cam rotates to push any one gear mechanism to abut against the inner gear ring.

2. The integrated shift structure according to claim 1, wherein: the gear mechanism comprises at least two gear mechanisms, wherein the at least two gear mechanisms are respectively a forward gear mechanism and a reverse gear mechanism, the forward gear mechanism and the reverse gear mechanism respectively comprise gear rods, the end parts of the gear rods, which are close to the inner gear ring, form inclined planes, and the directions of the inclined planes of the gear rods of the forward gear mechanism and the inclined planes of the gear rods of the reverse gear mechanism are opposite.

3. The integrated shift structure according to claim 2, wherein: the gear lever comprises a lever body and a gear piece, the gear piece is fixed to the end portion of a gear, the inclined plane is located on the gear piece, and the gear piece and the lever body are detachably connected.

4. The integrated shift structure according to claim 1, wherein: at least one gear mechanism is a damping gear mechanism, the damping gear mechanism comprises a damping rod and a damping piece fixed at the end part of the damping rod, and the damping piece is used for abutting against the inner wall of the inner gear ring.

5. The integrated shift structure according to claim 1, wherein: at least one gear mechanism is a braking gear mechanism which comprises a brake rod and a brake piece, and the brake piece is clamped in a tooth groove of the inner gear ring.

6. An elbow joint, characterized by: comprising the integrated shift structure according to any one of claims 1 to 5.