阅读说明：本技术 一种频率无级可调的动力吸振器 (Power vibration absorber with stepless adjustable frequency ) 是由 罗善德 刘浩 黄祚华 屈少举 于 2020-04-26 设计创作，主要内容包括：本发明公开了一种频率无级可调的动力吸振器,包括质量块和弹簧,其特征在于：所述弹簧的两端分别连接有一个调节套,所述调节套内开设有与所述弹簧形状对应、与所述弹簧表面过盈配合的螺纹槽；所述质量块包括多个可相互同轴固定为一整体的质量分块；所述质量分块与所述调节套上分别设有可使二者相互固定的固接结构。本发明所设计的动力吸振器实现了固有频率的无级可调、在一定范围内覆盖了所有的频率值。同时,不管是质量块的增减还是弹簧受力长度的调整都十分方便,有效解决了现场调试困难和精度低的问题。(The invention discloses a power vibration absorber with stepless adjustable frequency, which comprises a mass block and a spring, and is characterized in that: two ends of the spring are respectively connected with an adjusting sleeve, and a thread groove which corresponds to the shape of the spring and is in interference fit with the surface of the spring is formed in each adjusting sleeve; the mass block comprises a plurality of mass sub-blocks which can be coaxially fixed into a whole; the mass blocks and the adjusting sleeves are respectively provided with a fixed connection structure which can fix the mass blocks and the adjusting sleeves. The dynamic vibration absorber designed by the invention realizes stepless adjustment of the natural frequency and covers all frequency values in a certain range. Meanwhile, the mass block is increased or decreased, and the stress length of the spring is adjusted conveniently, so that the problems of difficulty in field debugging and low precision are effectively solved.)

1. A dynamic vibration absorber with stepless adjustable frequency comprises a mass block and a spring (3), and is characterized in that: two ends of the spring (3) are respectively connected with an adjusting sleeve, and a thread groove (6) which corresponds to the shape of the spring (3) and is in interference fit with the surface of the spring (3) is formed in the adjusting sleeve; the mass block comprises a plurality of mass blocks (1) which can be coaxially fixed into a whole; the mass blocks (1) and the adjusting sleeves are respectively provided with a fixed connection structure which can fix the mass blocks and the adjusting sleeves.

2. The frequency stepless adjustable dynamic vibration absorber of claim 1, wherein: the adjusting sleeve comprises a sleeve (7) and a flanging lantern ring (8) which is coaxially and fixedly connected to the circumferential surface of one end of the sleeve (7) and integrated with the sleeve (7), and the inner wall of the sleeve (7) is provided with the thread groove (6).

3. The frequency stepless adjustable dynamic vibration absorber of claim 2, wherein: the adjusting sleeve comprises a first adjusting sleeve (4) and a second adjusting sleeve (2) which are arranged up and down oppositely, and the second adjusting sleeve (2) and the mass blocks (1) are respectively provided with the fixedly connecting structures.

4. The frequency stepless adjustable dynamic vibration absorber of claim 3, wherein: the fixed connection structure comprises a lantern ring bolt through hole (9) which is arranged on a flanging lantern ring (8) of the second adjusting sleeve (2) and is parallel to the axial direction of the sleeve (7), and a lantern ring fixing threaded hole (10) which is arranged on the mass block (1) and corresponds to the lantern ring bolt through hole (9); the lantern ring bolt through hole (9) and the lantern ring fixing threaded hole (10) can be fixed through a bolt (5).

5. The frequency stepless adjustable dynamic vibration absorber of claim 4, wherein: the mass block (1) comprises a columnar mass part (1.1) and a connecting part (1.2) which is fixedly connected to the middle of the bottom surface of the mass part (1.1) and integrated with the mass part (1.1), and a connecting part fixing hole (1.3) which can be matched with the connecting part (1.2) and coaxially fixes the two mass blocks (1) into a whole is formed in the middle of the top surface of the mass part (1.1); the lantern ring fixing threaded hole (10) is formed in the top surface of the mass portion (1.1).

6. The frequency stepless adjustable dynamic vibration absorber of claim 5, wherein: connecting portion (1.2) are cylinder type, the surface sets up screwed threaded connection portion, connecting portion fixed orifices (1.3) be with the surface screw thread complex's of connecting portion (1.2) screw thread fixed orifices.

7. The frequency stepless adjustable dynamic vibration absorber of claim 3, wherein: and a collar bolt through hole (9) which is parallel to the axial direction of the sleeve (7) is formed in the flanging collar (8) of the first adjusting sleeve (4).

8. The frequency stepless adjustable dynamic vibration absorber of claim 1, wherein: the mass block comprises at least four blocks with the mass ratio of 1: 2: 2: 5 of the mass block (1).

9. The frequency stepless adjustable dynamic vibration absorber of claim 1, wherein: and a damping layer is coated on the wall of the thread groove (6).

Technical Field

The invention relates to the technical field of automobile dynamic vibration absorbers, in particular to a dynamic vibration absorber with stepless adjustable frequency.

Background

The dynamic vibration absorber is a means for effectively controlling the vibration of an automobile, and the principle of the dynamic vibration absorber is that a vibration subsystem is added to convert a certain mode of an original vibration main system into two close modes, and the vibration energy under the frequency of the original mode is transferred onto the additional vibration subsystem, so that the vibration amplitude of the vibration main system is controlled. Usually, the dynamic vibration absorber is composed of an additional mass block and a spring damping unit, and the vibration absorption in the rotating direction is a combination of a rotating inertia block and a torsion spring.

Under the condition of not considering the damping effect, the mass and the rigidity of the dynamic vibration absorber are adjusted to enable the natural frequency of the dynamic vibration absorber to be consistent with the vibration frequency to be absorbed of the vibration main system, at the moment, the energy transferred to the dynamic vibration absorber by the vibration main system is the largest, and the vibration absorption effect is the most obvious. In an actual mechanical structure, damping is ubiquitous, and the optimal parameter design of the dynamic vibration absorber can refer to the following calculation formula:calculating;

wherein, mu is m₂/m₁For the mass m of the dynamic vibration absorber₂With main system mass m₁The ratio of the ratio is generally 0.1 or more in engineering.Is the natural frequency of the damper; k is a radical of₂Is the spring rate of the dynamic vibration absorber.

The parameter design of the dynamic vibration absorber firstly selects a proper mass ratio according to the vibration mode mass and the participation factor of the vibration main system, and then inversely calculates the rigidity value of the dynamic vibration absorber according to the target frequency without considering the damping effect. However, the determination of the final parameters is affected by the difficulty in confirming the modal quality of the vibration main system, the damping effect and the influence of manufacturing errors, so that a plurality of dynamic vibration absorbers for debugging are designed and manufactured in engineering practical application, and are continuously replaced and debugged on site. Such a development process is time-consuming and labor-consuming, and the parameters of the dynamic vibration absorber that is finally successfully tuned are often not optimal design solutions.

Through patent retrieval and investigation, some patents of the adjustable dynamic vibration absorber can be looked up so as to solve the problem of convenience in field debugging. For example, the invention patent application CN201110075488.0 and the utility model CN201720304668.4 use a plurality of masses to be overlapped with a rubber spring to realize a step-adjustable frequency, but each adjustment changes the mass ratio of the dynamic vibration absorber, which goes against the general design principle of the dynamic vibration absorber. The invention patent application CN201811257162.8 realizes rigidity adjustment by changing the number of rubber blocks or replacing rubber blocks with different hardness, and the rigidity is also step-adjustable, and the rigidity is influenced by the non-uniformity of the rubber rigidity, and the unpredictable error is larger. In addition, utility model patent CN201820989557.6 adopts the form that a plurality of quality pieces pass through the clamp to compress tightly on the rubber column, and the number through the adjustment quality piece realizes that the quality is adjustable, changes the participation length realization rigidity of rubber column through the position of adjustment clamp and is adjustable. However, the rigidity linearity degree of the rubber column is affected by local stress generated by the pressing mode of the hoop and the rubber column and the nonuniformity of rubber materials, and the hoop is fixed by the friction force of the side wall of the rubber column, so that the reliability is poor.

Disclosure of Invention

The invention aims to solve the defects of the background technology and provide a dynamic vibration absorber which is convenient for on-site debugging and has stepless, adjustable and accurate frequency parameters.

In order to achieve the purpose, the invention designs a dynamic vibration absorber with stepless adjustable frequency, which comprises a mass block and a spring, and is characterized in that: two ends of the spring are respectively connected with an adjusting sleeve, and a thread groove which corresponds to the shape of the spring and is in interference fit with the surface of the spring is formed in each adjusting sleeve; the mass block comprises a plurality of mass sub-blocks which can be coaxially fixed into a whole; the mass blocks and the adjusting sleeves are respectively provided with a fixed connection structure which can fix the mass blocks and the adjusting sleeves.

Furthermore, the adjusting sleeve comprises a sleeve and a flanging sleeve ring which is coaxially and fixedly connected to the circumferential surface of one end of the sleeve and has an integrated structure with the sleeve, and the inner wall of the sleeve is provided with the thread groove.

Furthermore, the adjusting sleeve comprises a first adjusting sleeve and a second adjusting sleeve which are arranged up and down oppositely, and the second adjusting sleeve and the mass blocks are respectively provided with the fixed connection structures.

Further, the fixed connection structure comprises a lantern ring bolt through hole which is arranged on a flanging lantern ring of the second adjusting sleeve and is parallel to the axial direction of the sleeve, and a lantern ring fixing threaded hole which is arranged on the mass block and corresponds to the lantern ring bolt through hole; the lantern ring bolt through hole and the lantern ring fixing threaded hole can be fixed through a bolt.

Furthermore, the mass blocks comprise cylindrical mass parts and connecting parts which are fixedly connected to the middle parts of the bottom surfaces of the mass parts and integrated with the mass parts, and connecting part fixing holes which can be matched with the connecting parts and coaxially fix the two mass blocks into a whole are formed in the middle parts of the top surfaces of the mass parts; the lantern ring fixing threaded hole is formed in the top surface of the quality portion.

Further, connecting portion are cylinder type, the surface sets up screwed threaded connection portion, connecting portion fixed orifices be with the surface screw thread complex's of connecting portion screw thread fixed orifices.

Furthermore, a collar bolt through hole which is parallel to the axial direction of the sleeve is formed in the flanging collar of the first adjusting sleeve.

Further, the mass block comprises at least four blocks with the mass ratio of 1: 2: 2: 5 into blocks.

Furthermore, a damping layer is coated on the groove wall of the thread groove.

The invention has the beneficial effects that: the two ends of the spring are connected through two adjusting sleeves, the two adjusting sleeves are arranged oppositely, the adjusting sleeve at the lower end of the spring is connected with one mass block through a flanging lantern ring after being connected with the end of the spring, the other adjusting sleeve is connected with a vibration main system through a flanging opening through a bolt, and the vibration main system needs to be opened in advance or provided with a vibration connecting support. In the actual debugging process, at first can increase other quality pieces that the connection needs through the screw thread on the quality piece as required, realize different mass ratio, when the unit quality that sets up is reasonable, realize the mass adjustment of higher accuracy through the nimble ratio of quality piece. On the basis, the spring can be rotated as required to adjust the position of the upper end adjusting sleeve on the axis of the spring, so that the length of the wire stressed by the spring is adjusted. According to the Huke's law and the structural characteristics of a uniform linear spring, the spring stiffness is linearly inversely proportional to the number of turns of the wire (equivalent to the length of the wire stressed by the spring). Therefore, the dynamic vibration absorber designed by the invention realizes stepless adjustment of the natural frequency and covers all frequency values in a certain range. Meanwhile, the mass block is increased or decreased, and the stress length of the spring is adjusted conveniently, so that the problems of difficulty in field debugging and low precision are effectively solved.

Drawings

Fig. 1 is a schematic structural diagram of a dynamic vibration absorber according to the present invention;

FIG. 2 is a front view of a second adjustment sleeve of the present invention;

FIG. 3 is a bottom view of a second adjustment sleeve according to the present invention;

FIG. 4 is an axial cross-sectional view of a second adjustment sleeve according to the present invention;

FIG. 5 is a front view of a mass block in the present invention;

FIG. 6 is a top view of a mass block of the present invention;

FIG. 7 is an axial cross-sectional view of a mass block of the present invention;

wherein, 1-quality piecemeal (1.1-quality portion, 1.2-connecting portion, 1.3-connecting portion fixed orifices), 2-second adjusting collar, 3-spring, 4-first adjusting collar, 5-bolt, 6 thread groove, 7-sleeve, 8-turn-ups lantern ring, 9-lantern ring bolt via holes, 10-lantern ring fixed screw hole, 11-vibration connection support.

Detailed Description

The invention is described in further detail below with reference to the figures and the specific embodiments.

The power vibration absorber with the stepless adjustable frequency as shown in fig. 1-7 comprises a mass block and a spring 3, two ends of the spring 3 are respectively connected with an adjusting sleeve, each adjusting sleeve comprises a first adjusting sleeve 4 and a second adjusting sleeve 2 which are arranged up and down relatively, the two adjusting sleeves are identical in structure and respectively comprise a sleeve 7 and a flange lantern ring 8 which is coaxially and fixedly connected to one end circumferential surface of the sleeve 7 and is of an integral structure with the sleeve 7, a thread groove 6 which corresponds to the shape of the spring 3 and is in interference fit with the surface of the spring 3 is formed in the inner wall of the sleeve 7, and a damping layer is coated on the wall of the thread groove 6.

The mass block comprises four blocks with the mass ratio of 1: 2: 2: 5 into mass 1. Quality piecemeal 1 includes the quality portion 1.1 of cylinder type and fixed connection in the bottom surface middle part of quality portion 1.1, with quality portion 1.1 connecting portion 1.2 as an organic whole, connecting portion 1.2 be cylinder type, the surface sets up screwed threaded connection portion, quality portion 1.1's top surface middle part seted up have the screw thread, with connecting portion complex connecting portion fixed orifices 1.3. Three lantern ring bolt through holes 9 parallel to the axial direction of the sleeve 7 are formed in the flanging lantern ring 8 of the second adjusting sleeve 2, and three lantern ring fixing threaded holes 10 corresponding to the lantern ring bolt through holes 9 are formed in the top surface of the mass part 1.1; the lantern ring bolt through hole 9 and the lantern ring fixing threaded hole 10 are fixed through the bolt 5.

In the invention, the first adjusting sleeve 4 is fixedly connected with a vibration main system needing vibration absorption control through a bolt 5 through a lantern ring bolt through hole 9 of the flanging sleeve, and the vibration main system or a vibration connecting bracket 11 thereof needs to be perforated in advance so as to be conveniently installed and fixed with the first adjusting sleeve 4. During actual debugging, the connecting part 1.2 and the connecting part fixing hole 1.3 on the mass block 1 are connected with other mass blocks 1 as required. The spring 3 is rotated as required to adjust the position of the first adjusting sleeve 4 on the axis of the spring 3, so that the stressed wire length of the spring 3 is realized. Therefore, the dynamic vibration absorber designed by the invention realizes stepless adjustment of the natural frequency and covers almost all frequency values in a certain range. Meanwhile, the dynamic vibration absorber is very convenient regardless of the increase and decrease of the mass block or the adjustment of the stress length of the spring 3, and the problems of difficult field debugging and low precision are effectively solved.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the structure of the present invention in any way. Any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention still fall within the scope of the technical solution of the present invention.