CN110963446A

CN110963446A - Rotary damper and pallet truck with same

Info

Publication number: CN110963446A
Application number: CN201911403019.XA
Authority: CN
Inventors: 蔡明龙; 杨亮; 姜宗平; 尚乐
Original assignee: Hangcha Group Co Ltd
Current assignee: Hangcha Group Co Ltd
Priority date: 2019-12-30
Filing date: 2019-12-30
Publication date: 2020-04-07

Abstract

The invention discloses a rotary damper and a pallet truck, comprising: the bearing comprises a shell and a rotary rotating shaft arranged in the shell, wherein at least one bearing is sleeved on the periphery of the rotating shaft, a limiting device used for limiting the axial movement of an outer ring of the bearing is arranged in the shell, a support piece used for supporting the end face of an inner ring of the bearing is arranged in the shell to reduce the axial movement stroke of the inner ring of the bearing, the periphery of the rotating shaft is fixedly connected with the inner ring of the bearing, and at least one end of the rotating shaft extends out of the shell. After with steering spindle and axis of rotation fixed connection, because the bearing inner race is under stop device's limiting action, the outer lane of bearing can not axial motion, under support piece's effect, the axial internal clearance of bearing reduces, and the frictional force of the inner circle of rolling element and bearing and the outer lane of bearing can increase at this moment to increase the frictional resistance moment of rolling element and bearing inner and outer lane, frictional resistance moment transmits to the steering spindle, can feed back to the operator, promotes the accuracy that the operator turned to.

Description

Rotary damper and pallet truck with same

Technical Field

The invention relates to the technical field of dampers, in particular to a rotary damper. Furthermore, the invention also relates to a pallet truck comprising the rotary damper.

Background

Since most operators are too light when the forklift equipped with electric steering (without a damping disc) steers, the operators may not feel how much they turn at all but not feel how much they turn at all, and the operators may not improve the accuracy of the operation due to lack of hand feeling (similar to the road feeling in automobiles).

In summary, how to provide a damper for a steering shaft of a forklift is a problem to be solved urgently by those skilled in the art.

Disclosure of Invention

In view of the above, an object of the present invention is to provide a rotary damper, which can generate a damping effect on a steering shaft when mounted on the steering shaft, and can give feedback to an operator when steering, thereby improving the operation accuracy.

Another object of the present invention is to provide a pallet truck comprising a rotary damper as described above.

In order to achieve the above purpose, the invention provides the following technical scheme:

a rotary damper comprising: the outer shell and the rotatable rotating shaft arranged in the outer shell, at least one bearing is sleeved on the periphery of the rotating shaft, a limiting device used for limiting the axial movement of an outer ring of the bearing is arranged in the outer shell, a supporting piece used for supporting the end face of an inner ring of the bearing to reduce the axial movement stroke of the inner ring of the bearing is arranged in the outer shell, the periphery of the rotating shaft is fixedly connected with the inner ring of the bearing, and at least one end of the rotating shaft extends out of the outer shell.

Preferably, the housing comprises a housing main body and an end cover, and the end cover is detachably arranged on the end face opening of the housing main body.

Preferably, the end cap is attached to the end opening of the housing main body by bolts.

Preferably, the two bearings are arranged in the shell, the two bearings are arranged in a manner of being axially opposite to each other, the two bearings are sleeved on the periphery of the rotating shaft, the supporting piece is arranged between the end faces of the two bearings, and limiting devices are respectively arranged between the supporting piece and the outer rings of the two bearings.

Preferably, the supporting member is a nylon sleeve arranged between the two bearing end faces, the limiting device is an elastic member arranged between the two ends of the nylon sleeve and the two bearings, one end of the elastic member abuts against the end portion of the nylon sleeve, the other end of the elastic member abuts against the outer ring of the one bearing so as to press the outer ring of the bearing against the inner wall of the shell, and the nylon sleeve is fixedly sleeved on the rotating shaft.

Preferably, the elastic member is a wave spring.

Preferably, a washer is arranged between the wave spring and the outer ring of the bearing.

The utility model provides a pallet truck, includes the automobile body and set up in steering wheel on the automobile body, the below of steering wheel is connected with the steering column, the lower extreme of steering column is connected with the aforesaid rotary damper, steering column fixed connection in the axis of rotation.

The invention provides a rotary damper, comprising: the outer shell and the rotatable rotating shaft arranged in the outer shell are sleeved with at least one bearing, a limiting device used for limiting axial movement of an outer ring of the bearing is arranged in the outer shell, a supporting piece used for supporting against the end face of an inner ring of the bearing to reduce axial movement stroke of the inner ring of the bearing is arranged in the outer shell, the outer periphery of the rotating shaft is fixedly connected with the inner ring of the bearing, and at least one end of the rotating shaft extends out of the outer shell.

The rotary damper provided by the invention can be applied to a steering shaft, after the steering shaft and the rotating shaft are fixedly connected, the steering shaft can drive the rotating shaft to rotate when stressed to rotate, the rotating shaft drives the inner ring of the bearing to rotate, the outer ring of the bearing cannot axially move under the limiting action of the limiting device, the axial play of the bearing is reduced under the action of the supporting piece, and the friction force between the rolling body and the inner ring of the bearing and the friction force between the rolling body and the inner ring and the outer ring of the bearing are increased, so that the friction resistance moment is transmitted to the steering shaft and fed back to an operator, the operator can feel the friction resistance moment, and the steering accuracy of the operator is improved.

The invention further provides the pallet truck, and the accuracy of the operation of the pallet truck by an operator is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a schematic view of a first embodiment of a rotary damper provided in accordance with the present invention;

fig. 2 is a schematic view of a second embodiment of a rotary damper provided in the present invention.

In FIGS. 1-2:

1-rotating shaft, 2-gasket, 3-shell, 4-nylon sleeve, 5-bearing and 6-wave spring.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The core of the invention is to provide a rotary damper which can generate a damping effect on a steering shaft when being arranged on the steering shaft, can feed back to an operator when steering and improves the operation accuracy.

Another core of the invention is to provide a pallet truck comprising the above-mentioned rotary damper.

Referring to fig. 1-2, fig. 1 is a schematic diagram of a rotary damper according to a first embodiment of the present invention; fig. 2 is a schematic view of a second embodiment of a rotary damper provided in the present invention.

A rotary damper comprising: the outer shell 3 and the rotatable axis of rotation 1 that sets up in the outer shell 3, the periphery cover of axis of rotation 1 is equipped with at least one bearing 5, be equipped with the stop device that is used for restricting the outer lane axial motion of bearing 5 in the outer shell 3, be equipped with in the outer shell 3 and be used for pushing up on the terminal surface of the inner circle of bearing 5 to reduce the support piece of the axial motion stroke of the inner circle of bearing 5, the periphery of axis of rotation 1 and the inner circle fixed connection of bearing 5, the at least one end of axis of rotation 1 stretches out outer shell.

It should be noted that the structure of the housing 3 can be set according to actual conditions, a space for installing the rotating shaft 1 and the bearing 5 is arranged inside the housing 3, a cylindrical cavity of the outer ring of the bearing 5 can be arranged inside the housing 3, and the bearing 5 is installed inside the cavity and then the outer ring of the bearing 5 is axially limited by the limiting device.

The effect of stop device is the outer lane axial motion of restriction bearing 5, stop device can unilateral restriction bearing 5's outer lane, also can two sides restriction bearing 5's outer lane, when stop device unilateral restriction bearing 5's outer lane, set up stop device in one side of bearing 5's outer lane, the opposite side of compress tightly bearing 5's outer lane is laminated in shell 3 inner wall, utilize shell 3's inner wall restriction bearing 5's outer lane opposite side, when stop device bilateral restriction bearing 5's outer lane, can set up to two annular plate-like structures, set up respectively in the both sides of bearing 5's outer lane and the outer lane of clamping bearing 5.

The number of the bearings 5 can be set according to actual conditions, and when more than two bearings 5 are arranged, all the bearings 5 are coaxially arranged for ensuring stability because the inner rings of all the bearings 5 are connected with the rotating shaft 1. The rotating shaft 1 and the bearing 5 can be connected in an interference fit manner, and other connection manners, such as welding, can also be adopted, and the rotating shaft 1 and the bearing 5 are preferably connected together in the interference fit connection manner due to the fact that the welding is inconvenient to assemble and disassemble.

The rotary damper provided by the invention can be applied to a steering shaft, after the steering shaft is fixedly connected with a rotating shaft 1, the rotating shaft 1 can be driven to rotate when the steering shaft is stressed to rotate, the rotating shaft 1 drives an inner ring of a bearing 5 to rotate, the outer ring of the bearing 5 cannot axially move under the limiting action of a limiting device, the axial clearance of the bearing 5 is reduced under the action of a supporting piece, and at the moment, the friction force between a rolling body and the inner ring of the bearing 5 and the friction force between the rolling body and the inner ring and the outer ring of the bearing 5 can be increased, so that the friction resistance moment between the rolling body and the inner ring and the outer ring of the bearing 5 can be increased and can be fed back to an operator, the operator can feel the friction resistance moment.

In addition to the above-described embodiments, it is further preferable that the housing 3 includes a housing main body and an end cover, and the end cover is detachably provided on an end surface opening of the housing main body.

It should be noted that the housing main body is substantially hollow cylindrical, and an end opening is provided at one end of the housing main body, or end openings are provided at both ends of the housing main body. The first implementation mode of the rotary damper is that end face openings are arranged at two ends of the shell main body, and end covers are arranged on the two end face openings; the second embodiment of the rotary damper is that one end of the housing main body is provided with an end face opening, an end cover is arranged on the end face opening, and the end cover can be detachably arranged on the end face opening, so that the device inside the housing 3 can be conveniently disassembled and assembled, in the first embodiment of the rotary damper, the end cover is provided with a through hole, so that one end of the rotating shaft 1 extends out along the through hole to be connected with a steering shaft, in the second embodiment of the rotary damper, the housing main body is provided with a through hole, and one end of the rotating shaft 1 extends out along the through hole to be connected with the steering shaft. The housing 3 of the embodiment has a simple structure, is convenient to process, and facilitates the connection of the rotating shaft 1 with an external steering shaft.

In addition to the above embodiments, it is further preferable that the end cap is attached to the end face opening of the housing main body by a bolt.

It should be noted that at least one first screw hole is arranged on the cover surface of the end cover, second screw holes which are consistent with the first screw holes in number and are in one-to-one correspondence are arranged on the opening end surface of the shell main body, and bolts are used for penetrating through the first screw holes and the second screw holes so as to connect the end cover to the opening end surface of the shell main body. The mode of using bolted connection is convenient for process and dismouting.

On the basis of the above embodiment, as a further preferred option, two bearings 5 are arranged in the housing 3, the two bearings 5 are arranged to face each other in the axial direction, the two bearings 5 are both sleeved on the periphery of the rotating shaft 1, the supporting member is arranged between the end surfaces of the two bearings 5, and limiting devices are respectively arranged between the supporting member and the outer rings of the two bearings 5.

It should be noted that the inner rings of the two bearings 5 are fixedly sleeved on the periphery of the rotating shaft 1, the limiting devices are arranged between the end surfaces of the two bearings 5, the limiting devices are respectively arranged between the supporting member and the outer rings of the two bearings 5, one end of each limiting device abuts against the outer ring of the bearing 5 on the inner wall of the housing 3 to limit the axial movement of the outer rings of the two bearings 5, and the other end abuts against the supporting member. This embodiment simple structure sets up two bearings 5 and can increases the 1 pivoted stability of axis of rotation, sets up support piece between the terminal surface of two bearings 5 to be equipped with stop device respectively between support piece and the outer lane of two bearings 5 and can reduce the volume of shell 3.

On the basis of the above embodiment, as a further preferable mode, the supporting member is a nylon sleeve 4 disposed between the end surfaces of the two bearings 5, the limiting device is an elastic member disposed between the two ends of the nylon sleeve 4 and the two bearings 5, one end of the elastic member abuts against the end of the nylon sleeve 4, the other end abuts against the outer ring of the one bearing 5 to press the outer ring of the bearing 5 against the inner wall of the housing 3, and the nylon sleeve 4 is fixedly sleeved on the rotating shaft 1.

It should be noted that, nylon cover 4 is hollow cylinder, nylon cover 4 is fixed suit in the periphery of axis of rotation 1, preferably, be equipped with the round pin axle that is used for fixed mounting nylon cover 4 on axis of rotation 1, the outside at the both ends face of nylon cover 4 is equipped with two annular sunken, two annular sunken internal diameter and external diameter can set up according to the practical application condition, set up the external diameter of nylon cover 4 slightly to be less than the outer lane external diameter of bearing 5 in this embodiment, two annular sunken external diameters can set up to slightly be less than the outer lane external diameter of bearing 5, be equipped with the columniform cavity in shell 3. Elastic pieces are respectively arranged between the two annular recesses and the end faces of the two bearings 5, and the elastic pieces compress the outer rings of the two bearings 5 on the inner wall of the shell 3. Can compress tightly nylon cover 4 when the elastic component compresses tightly the outer lane,

nylon cover

4 and 1 fixed connection of axis of rotation, the elastic component also can produce frictional force with 4 frictions of nylon cover, and then has frictional resistance square to axis of rotation 1, this embodiment simple structure in addition, the processing and installation of being convenient for.

In addition to the above embodiments, it is further preferable that the elastic member is a wave spring 6.

The wave spring 6 is in an annular cylindrical shape and can be installed in the annular recess, and the wave spring 6 is large in stiffness range and high in buffering and vibration absorbing capacity. Under the same physical parameter condition, the required installation space is smaller, so that the whole volume of the rotary damper can be reduced.

In addition to the above embodiments, it is further preferable that the washer 2 is provided between the wave spring 6 and the outer ring of the bearing 5. In order to reduce the friction between the wave spring 6 and the outer ring of the bearing 5, a gasket 2 is arranged between the wave spring 6 and the outer ring of the bearing 5, and due to the existence of the gasket 2, the pressure between the wave spring 6 and the outer ring of the bearing 5 and the nylon sleeve 4 can be increased, so that the friction resistance moment is increased, and the installation of the bearing 5 is more stable.

In addition to the rotary damper, the invention also provides a pallet truck, which comprises a truck body and a steering wheel arranged on the truck body, wherein a steering rod is connected below the steering wheel, the lower end of the steering rod is connected with the rotary damper of any one of the above items, and the steering rod is fixedly connected with the rotating shaft 1. The operation workman can feel the damping effect that rotary damper brought the steering wheel when operating this pallet truck to give the operation workman feedback, promote the accuracy of operation workman's operation.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The rotary damper and pallet truck provided by the present invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims

1. A rotary damper, comprising: shell (3) and rotatable set up in axis of rotation (1) in shell (3), the periphery cover of axis of rotation (1) is equipped with at least one bearing (5), be equipped with in shell (3) and be used for the restriction the outer lane axial motion's of bearing (5 stop device, be equipped with in shell (3) and be used for the top on the terminal surface of the inner circle of bearing (5), in order to reduce the support piece of the axial motion stroke of the inner circle of bearing (5), the periphery of axis of rotation (1) with the inner circle fixed connection of bearing (5), at least one end of axis of rotation (1) stretches out the shell.

2. A rotary damper according to claim 1, characterized in that the housing (3) comprises a housing body and an end cap, which is detachably arranged on an end opening of the housing body.

3. The rotary damper of claim 2, wherein the end cap is bolted to the end opening of the housing body.

4. A rotary damper according to any one of claims 1 to 3, wherein two bearings (5) are arranged in the housing (3), the two bearings (5) are arranged in a manner of being axially opposite to each other, the two bearings (5) are both sleeved on the periphery of the rotating shaft (1), the supporting member is arranged between the end surfaces of the two bearings (5), and a limiting device is respectively arranged between the supporting member and the outer rings of the two bearings (5).

5. The rotary damper according to claim 3, wherein the supporting member is a nylon sleeve (4) disposed between two end faces of the bearing (5), the position-limiting device is an elastic member disposed between two ends of the nylon sleeve (4) and two of the bearings (5), one end of the elastic member abuts against an end of the nylon sleeve (4), and the other end abuts against an outer ring of one of the bearings (5) to press the outer ring of the bearing (5) against an inner wall of the housing (3), and the nylon sleeve (4) is fixedly sleeved on the rotating shaft (1).

6. A rotary damper according to claim 4, characterized in that the elastic member is a wave spring (6).

7. A rotary damper according to claim 5, characterized in that a washer (2) is provided between the wave spring (6) and the outer ring of the bearing (5).

8. A pallet truck comprising a truck body and a steering wheel arranged on the truck body, a steering rod being connected below the steering wheel, characterized in that the lower end of the steering rod is connected with a rotary damper according to any one of claims 1 to 7, the steering rod being fixedly connected to the rotating shaft (1).