CN109330249B

CN109330249B - Electric self-locking seat lifting mechanism

Info

Publication number: CN109330249B
Application number: CN201811411982.8A
Authority: CN
Inventors: 倪旭涛
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-11-25
Filing date: 2018-11-25
Publication date: 2024-11-19
Anticipated expiration: 2038-11-25
Also published as: CN109330249A

Abstract

The invention discloses an electric self-locking type seat lifting mechanism, which comprises a hollow short shaft, a sleeve and a threaded rod, wherein the hollow part of the hollow short shaft is used for clamping a motor and a power supply control module, the hollow short bearing is arranged on a bidirectional thrust ball bearing, a motor working shaft penetrates through the hollow short shaft and the bidirectional thrust ball bearing and is connected to a central gear of a planetary gear set below the motor working shaft so as to drive the planetary gear set to rotate, a boss is arranged in the sleeve in a turning mode, a straight tooth profile is inserted as a sun gear, a trapezoidal thread is tapped at the lower end of the sleeve, the bidirectional thrust ball bearing sleeve is arranged on the boss in the sleeve, the sun gear in the sleeve is meshed with a planetary gear set, the planetary gear is rotated along with the planetary gear, the trapezoidal thread in the sleeve is in the same shape as the threaded rod and can be mutually matched and connected, the sleeve moves up and down relative to the threaded rod, the lifting of the whole mechanism is realized, and the thread rise angle of the trapezoidal thread ψ=5 DEG < equivalent friction angle ρ '=5° 55', and self-locking can be realized.

Description

Electric self-locking type seat lifting mechanism

Technical Field

The invention relates to the field of lifting devices, in particular to an electric self-locking type seat lifting mechanism.

Background

The height of the liftable seat is adjustable, so that people with different heights can adjust the liftable seat to the comfortable height of the user, the adaptability and the comfort level of the seat are greatly improved, and the liftable seat is convenient to use, so that the liftable seat is widely used in daily life work and has huge market share.

The current common lifting chairs in the market mostly adopt an air pressure rod as a lifting mechanism, and in addition, the lifting chairs using mechanical lifting mechanisms and hydraulic lifting mechanisms are also available, but the current audience is few. The nitrogen is filled in the pneumatic rod of the pneumatic rod type lifting mechanism, the concentration is generally over 99 percent, the pressure is about one or two atmospheres, and the pneumatic rod type lifting mechanism has strict requirements on the material and gas sealing of the pneumatic rod. However, the condition that manufacturers use low-purity nitrogen and inferior materials to produce pneumatic rods is frequent, and the pneumatic rods often have the problem that quality of the pneumatic rods is not up to standard, such as poor sealing, and the like, and have great potential safety hazards. In addition, the repeated lifting and friction of the air pressure rod in use can gradually lead to the reduction of sealing performance, and the factors such as over high ambient temperature and the like can possibly cause safety problems.

In recent years, cases of explosion and casualties of pneumatic elevators are endless. Although most of them are due to the purchase of poor quality products. However, under the condition of high temperature environment or too frequent friction, the air pressure rod can lead to sudden temperature rise of the air cylinder, internal air expansion and air pressure increase, and the sealing port can also be reduced in performance due to aging problems of used materials, so that the air can burst out, and explosion can occur. This inherent defect of the pneumatic rod therefore causes a certain problem in its safety.

Disclosure of Invention

The invention aims to overcome the problems in the prior art and provide an electric self-locking type seat lifting mechanism, which not only solves the possible safety problem of using an air pressure type lifting mechanism, but also can realize self-locking and motor control, thereby improving the operation convenience and safety.

In order to achieve the technical purpose and the technical effect, the invention is realized by the following technical scheme:

The electric self-locking seat lifting mechanism comprises a hollow short shaft, a sleeve and a threaded rod, wherein a reversing motor, a power supply and a control module are clamped at the hollow part in the hollow short shaft, the lower end of the hollow short shaft is supported on a bidirectional thrust ball bearing, a motor working shaft passes through the hollow short shaft and is directly connected with a central gear of a planetary gear set below the hollow short shaft to drive a planetary gear train driving wheel to rotate with a planetary gear, a boss is machined in the sleeve, a straight tooth profile is inserted to serve as a sun gear, a trapezoidal thread is tapped at the lower end of the sleeve, a bidirectional thrust ball bearing sleeve is supported on the boss in the sleeve, the sun gear in the sleeve is meshed with a planetary gear in the planetary gear set and rotates with the planetary gear, the trapezoidal thread in the sleeve is isomorphic and can be mutually matched and connected, the rotation of the sleeve drives the threaded rod below the threaded rod to rotate, so that the lifting of the whole mechanism is realized, and the thread lifting angle of the trapezoidal thread is psi=5 DEG < equivalent friction angle ρ '=5 DEG 55', so that self-locking is realized.

Further, the upper end of the hollow short shaft is connected with the seat, and the connection mode can be in threaded connection by adopting a screw or can be changed according to other connection modes of the existing seat.

Further, the motor, the power supply and the control module comprise a power supply, an operating lever and a sector plate, and the change of the power supply electrode access direction is realized through the lever principle, so that the change of the positive and negative steering of the motor is realized.

Further, the boss in the sleeve is in contact with a bidirectional thrust ball bearing, the outer ring of the bidirectional thrust ball bearing is in transition fit with the inner wall of the sleeve, and the bidirectional thrust ball bearing is in transition fit with the outer ring at the lower end of the hollow short shaft.

Further, steering of a planetary gear train central gear directly connected with the motor is controlled through steering of the motor, the central gear drives planetary gears of the planetary gear train to be meshed with the planetary gears of the planetary gear train, and a sun gear in a sleeve is meshed with the planetary gears of the planetary gear train, so that steering control of the sleeve is realized, lifting of the sleeve to a threaded rod is realized, and lifting of a chair seat surface connected with the upper surface of a hollow short shaft is realized

Further, the thread rise angle ψ of the trapezoidal thread=5° < equivalent friction angle ρ '=5° 55', (the condition that the trapezoidal thread is satisfied for self-locking is that the thread rise angle is smaller than the equivalent friction angle) so that self-locking can be achieved.

Further, the lower end of the threaded rod is connected with the seat foot rest in a threaded connection mode.

The invention has the following benefits:

1. The mechanical lifting mechanism avoids the explosion risk existing in the pneumatic lifting mechanism, improves the safety, and does not cause serious safety problems existing in the pneumatic lifting mechanism even if parts are worn, aged and even broken due to frequent use.

2. By adopting motor drive, a user can sit on the chair and use the operating lever to realize the lifting of the height of the chair without lifting, and the precision of the threaded lifting mechanism is higher than that of a pneumatic type, so that the threaded lifting mechanism can be accurately and freely adjusted to the required height.

3. Compared with other similar mechanical lifting mechanisms, the self-locking mechanism adopts the thread self-locking mode, does not need an additional locking device, reduces parts, reduces the failure rate, and is simpler and more reliable.

4. The lifting mechanism can be adapted to various seats and foot rests on the market, a user can select a seat style, a control rod style, a battery type and the like according to the needs, and even a remote control device can be used, so that the lifting mechanism is high in flexibility and applicability, and is worthy of being popularized greatly.

5. Even if the mechanism cannot be driven by the motor due to various reasons in the use process, the lifting of the mechanism can be realized through manually rotating the sleeve, so that the lifting function is not affected, and the pneumatic lifting mechanism is incomparable with the traditional pneumatic structure.

6. The screw thread system and the gear tooth form used in the invention both adopt national standard, the processing cost is lower, the bidirectional thrust ball bearing used is also national standard, the price is low, and the production cost is lower.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic view of an embodiment of an electric self-locking seat lifting mechanism according to the present invention:

fig. 2 is an enlarged view of a portion a1 in fig. 1:

fig. 3 is an enlarged view of a portion b 2in fig. 1:

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

As shown in fig. 1-3, the invention is an electric self-locking seat lifting mechanism, which comprises a hollow short shaft 1, a sleeve and a threaded rod 4, wherein the plane of the upper end of the hollow short shaft 1 is used for being connected with a seat surface, a reversing motor 7 and a power control module a1 are clamped at the hollow part in the hollow short shaft 1, the lower end of the hollow short shaft is supported at the upper end of a bidirectional thrust ball bearing 6, the lower end of the bidirectional thrust ball bearing 6 is supported on a boss 21 made by a car in the sleeve, a working shaft of the motor 7 passes through the hollow short shaft 1 and is connected with the bidirectional thrust ball bearing and a central gear 15 of a lower Fang Hangxing wheel set b2, the central gear 15 is driven to rotate by the rotation of the motor 7, thereby driving two planetary gears 14 meshed with the central gear 15 of the planetary wheel set, a straight-tooth-shaped sun gear 22 is inserted into the inner wall of the sleeve to be meshed with the planetary gears 14, the sleeve is driven to rotate by the sun gear 22 in the sleeve meshed with the planetary gears 14, a trapezoidal thread 31 is tapped at the lower end of the sleeve, the trapezoidal thread 31 is connected with the thread on the threaded rod 4 in a mutual matching way, the rotation of the sleeve drives the threaded rod 4 to rotate, thereby lifting is realized, and the thread of the trapezoidal thread=5' =5 degrees of friction equivalent and the self-locking friction angle is smaller than the friction angle of the trapezoidal thread is realized (the friction angle is 55 degrees and is smaller than the friction angle is 55 degrees).

With reference to fig. 1, the motor-driven threaded self-locking seat lifting mechanism comprises a hollow short shaft 1, wherein the upper end plane of the short shaft is used for being connected with a seat, and only through holes for being matched with studs in threaded connection are shown in the figure, and the limitation of the invention is not to be interpreted.

The hollow part in the hollow short shaft 1 is used for clamping the reversing motor 7, the power supply and control module a1, referring to fig. 2, the descending and the ascending of the sector plate 12 are realized by the lever principle through lifting or pressing the operating rod 5, the resetting of the operating rod 5 is realized through the spring 11, the sector plate 12 is fixedly provided with the circuit conducting modules 9 and 10, and when the sector plate 12 descends, the module 9 is connected with a circuit, the circuit is conducted, and the motor rotates positively; when the sector plate 12 is lifted, the module 10 is connected to a circuit, the circuit is conducted, the current direction is changed, and the motor is reversed.

The figure shows only a general schematic of the implementation of motor control, and the specific manner of manipulation can be varied according to the needs of the user due to the flexibility of the invention and is not to be construed as limiting the invention.

Wherein, the motor 7 rotates to drive the central gear 15 of the epicyclic gear train b2 to rotate, so that the gear 15 directly connected with the motor 7 is used as a driving wheel in the epicyclic gear train to drive the two planet gears 14 meshed with the driving wheel to rotate. The rotating arm 8 loaded with the planet wheel 14 is loaded on the hollow short shaft 1 and can rotate relative to the hollow short shaft 1, so that revolution of the planet wheel 14 is realized, and the planet wheel 14 drives the sun wheel 22 to rotate so as to drive the sleeve to rotate.

In a preferred embodiment of the present invention, the sleeve is composed of an upper sleeve 2 and a lower sleeve 3, the upper sleeve 2 and the lower sleeve 3 are connected by a key (the key is integrated with the sleeve 3), and they can rotate synchronously, wherein a boss 21 is turned in the upper sleeve 2, a straight tooth-shaped sun gear 22 is inserted into the inner wall of the upper sleeve 2, and a trapezoidal thread 31 is tapped into the sleeve 3.

The upper sleeve 2 is internally provided with a boss 21 for bearing the bidirectional thrust ball bearing 6, the lower end surface of the bidirectional thrust ball bearing 6 is contacted with the boss in the upper sleeve 2, and the outer surface of the maximum diameter of the bidirectional thrust ball bearing 6 is in transition fit with the inner surface of the upper sleeve 2. The surface of the minimum diameter part of the inner hole of the bidirectional thrust ball bearing 6 is in transition fit with the surface of the outer ring of the downward extending end of the hollow short shaft 1. By means of the bidirectional thrust ball bearing 6, the hollow short shaft 1 and the upper sleeve 2 realize mutual rotation and are not influenced by each other, namely, the seat cannot be influenced by the rotation of the shaft sleeve during lifting, and the shaft sleeve cannot be driven to rotate during the rotation of the seat to cause integral lifting.

The planetary gear system b2 drives the upper sleeve 2 to transmit torque to the lower sleeve 3 by means of keys, threads 31 on the lower sleeve 3 and threads made on the threaded rod 4 are identical in shape, the lower sleeve 3 is connected with the threaded rod 4 through threads, and lifting is achieved through mutual matching of the lower sleeve 3 and the threaded rod 4. Because the thread lead angle ψ=5° < equivalent friction angle ρ '=5° 55' (the condition that the thread lead angle is smaller than the equivalent friction angle is satisfied for the trapezoidal thread self-locking) of the trapezoidal thread satisfies the self-locking condition, namely, if the shaft sleeve 3 does not rotate when a user sits on the seat, the shaft sleeve does not move in the vertical direction (z-axis direction), self-locking is realized, and the expected and use requirements of the invention are satisfied.

The bidirectional thrust ball bearing 6 can bear bidirectional axial load, the weight of a user is transferred to the shaft body of the hollow short shaft 1, the hollow short shaft 1 transfers the weight of the user and self weight of internal components to the bidirectional thrust ball bearing 6, the load is transferred to the upper sleeve 2 through the bidirectional thrust ball bearing 6, the upper sleeve 2 transfers the load to the lower sleeve 3, and the lower sleeve 3 transfers all the load to trapezoidal threads of the hollow short shaft and the threaded rod 4.

The lower end of the threaded rod 4 is connected with the foot rest, so that the threaded rod can be directly connected with the foot rest through threads, and the foot rest can also be provided with a switching device, is suitable for foot rests of different types, and reflects the flexibility and universality of the invention.

Due to the advantages of the design, when the emergency such as the damage of the driving motor or the operating device and the like caused by the too low electric quantity of the power supply, a user can still manually rotate the upper sleeve 2 and the lower sleeve 3, so that the lifting of the device is realized, and the practicability of the invention is embodied. In order to avoid accidents possibly occurring during use, the larger diameter of the upper end of the threaded rod 4 limits the ascending limit of the device, the descending limit of the device is limited by the clamping feet, in principle, the uppermost end of the threaded rod cannot exceed the uppermost end of the lower sleeve 3 in the descending process, and the length of the lower sleeve 3 is determined by actual requirements, so that the invention is safe, reliable and flexible.

In the description herein, reference to the terms "one embodiment," "example," "specific example," and the like, means that a particular feature, mechanism, material passing feature described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, mechanisms, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the invention disclosed above are intended only to assist in the explanation of the invention. The preferred embodiments are not exhaustive or to limit the invention to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best understand and utilize the invention. The invention is limited only by the claims and the full scope and equivalents thereof.

Claims

1. Electric self-locking type seat lifting mechanism, including hollow minor axis (1), sleeve, threaded rod (4), its characterized in that: the motor (7) and the power supply control module (a 1) are clamped at the hollow part in the hollow short shaft (1), a boss (21) is machined in the sleeve, a straight-tooth-shaped sun wheel (22) is inserted in the sleeve, a trapezoidal thread (31) is tapped at the inner lower end of the sleeve, and the thread of the threaded rod (4) is in the same shape as the thread (31) at the inner lower end of the sleeve and can be mutually matched and connected;

a bidirectional thrust ball bearing (6) is arranged below the hollow short shaft (1), the hollow short shaft (1) is borne on the bidirectional thrust ball bearing (6), and the bidirectional thrust ball bearing (6) is borne on a boss (21) which is turned in the sleeve;

The upper end plane of the hollow short shaft (1) is connected with the seat surface, and the lower end of the threaded rod (4) is connected with the foot rest;

The larger diameter of the upper end of the threaded rod (4) limits the ascending limit of the device, the descending limit of the device is limited by the installed clamping feet, and the uppermost end of the threaded rod does not exceed the uppermost end of the lower sleeve (3) in the descending process.

2. The electric self-locking seat lift mechanism of claim 1 wherein: the thread rise angle psi of the trapezoidal thread (31) and the trapezoidal thread of the threaded rod (4) is=5 degrees.

3. The electric self-locking seat lift mechanism of claim 2 wherein: the working shaft of the motor (7) passes through the hollow short shaft (1) and the bidirectional thrust ball bearing (6) to be directly connected with the sun gear (15) of the lower Fang Hangxing wheel set (b 2), two planet gears (14) in the planet wheel set (b 2) are meshed with the sun gear (15), and the rotating arm (8) for loading the planet gears (14) is loaded on the hollow short shaft (1) and can rotate relative to the hollow short shaft (1).

4. The electric self-locking seat lift mechanism of claim 3 wherein: a straight-tooth-shaped sun gear (22) is arranged in the cylinder and meshed with the planet gears (14), so that the sun gear (15) is driven to rotate through rotation of the motor (7), revolution of the planet gears (14) is achieved, and then the planet gears (14) drive the sun gear (22) to rotate, so that the sleeve is driven to rotate.

5. The electric self-locking seat lift mechanism of claim 4 wherein: in the power control module (a 1), the control lever (5) controls the descending and ascending of the sector plate (12), so as to control the circuit conduction modules (9, 10) fixed on the sector plate (12) to control the current direction after being connected into the conduction modules, thereby controlling the forward and reverse steering of the motor (7), realizing the steering control of the planetary gear set (b 2) and the sleeve, and further realizing the ascending and descending of the hollow short shaft (1).

6. The electric self-locking seat lift mechanism of claim 5 wherein: the sleeve comprises an upper sleeve (2) and a lower sleeve (3), the upper sleeve (2) and the lower sleeve (3) are connected by keys and synchronously rotate, a boss (21) is formed in the upper sleeve (2) in a turning mode, a straight tooth-shaped sun gear (22) is inserted into the inner wall of the upper sleeve (2), and trapezoidal threads (31) are formed in the lower sleeve (3) in a tapping mode.