CN1605680A - Synchronous drive method for parallel installation of multiple eccentric shafts and typical synchronous mechanism - Google Patents

Abstract

A synchronous driving method and a typical synchronous driving mechanism for multiple eccentric shafts installed in parallel, mainly composed of two parallel installed eccentric shafts, vibration bearings, vibration bearing seats, synchronous gearboxes, couplings, etc., the eccentric shafts are equipped with vibration Bearing, the vibration bearing is installed in the vibration bearing seat, the vibration bearing seat is installed on the web plate at both ends of the inner hole of the vibration wheel, the synchronous gearbox is positioned on the vibration bearing seat and installed on the web plate at both ends of the inner hole of the vibration wheel, the synchronous gear A synchronous gear is installed in the box, and the synchronous gear is connected with the eccentric shaft driven by the synchronous gear through a shaft coupling. The invention solves the problem of synchronous driving of multiple eccentric shafts installed in parallel.

Description

Synchronous drive method and typical synchronous drive mechanism with multiple eccentric shafts installed in parallel

The invention relates to a synchronous driving method and a typical synchronous driving mechanism of multiple (two or more) eccentric shafts installed in parallel, especially a synchronous driving method and a typical synchronous driving method of multiple eccentric shafts installed in parallel in the exciter of a vibratory road roller. The driving mechanism belongs to the field of road construction machinery.

The present invention uses a synchronous driving method and a typical synchronous driving mechanism with two eccentric shafts installed in parallel as a typical example to illustrate a synchronous driving method and a typical synchronous driving mechanism with multiple eccentric shafts installed in parallel.

At present, the excitation mechanisms of vibratory rollers widely used at home and abroad are exciters with a single eccentric shaft (or two eccentric shafts connected in series on one axis). The centrifugal force generated when the eccentric mass rotates at high speed forces the vibrating wheel to vibrate in the circumferential direction, that is, "circular vibration". Due to the harmful vibration in the horizontal direction of this "circular vibration", the compaction efficiency of the existing vibratory roller is limited; and , there is also a certain amount of environmental vibration pollution. In order to improve the performance defects of the "circular vibration" road roller, in recent years, the vertical vibration and oscillation vibration technology of the road roller has been studied. The vertical vibration is to install two eccentric shafts in parallel in the horizontal direction. In the exciter shell, the initial phase angles of the eccentric blocks of the two eccentric shafts are equal when installed, and the drive of the two eccentric shafts is realized by synchronous reverse rotation of a pair of synchronous gears directly installed on the eccentric shafts. The shell of the exciter does not rotate, so the centrifugal forces in the horizontal direction of the eccentric weights of the two oppositely installed eccentric shafts cancel each other out, and only generate the exciting force in the vertical direction. The vibration excitation mechanism is to install two eccentric shafts in parallel in the vibrating wheel. The initial phase angle difference between the eccentric blocks of the two eccentric shafts is 180°, and the two eccentric shafts are connected by a central shaft through the synchronous tooth shape. The belt drives two eccentric shafts to rotate synchronously and in the same direction. When the two eccentric shafts and the eccentric block rotate synchronously in the same direction, only parallel but opposite centrifugal forces are generated to form alternating torque to make the vibrating wheel body oscillate. But the vertical vibrating and oscillating vibrating road rollers provided by the above-mentioned prior art are difficult to enter the application stage. There are defects in the synchronous driving method and synchronous driving mechanism of two eccentric shafts installed in parallel. The two eccentric shafts installed in parallel in the oscillating vibrating wheel driven by the synchronous toothed belt, due to the harsh working conditions of the road roller, the working reliability and service life of the synchronous toothed belt are low; while the vertical vibrating wheel installed in parallel The synchronous drive of two eccentric shafts, due to the radial clearance of the vibrating bearing and the deflection changes during the rotation of the eccentric shafts, the transmission center distance of the two synchronous gears installed on the two eccentric shafts changes periodically during rotation , As a result, the service life of the two synchronous gears is short or even unable to operate normally.

The purpose of the present invention is to provide a new synchronous drive method and a typical synchronous drive mechanism in which two or more eccentric shafts are installed in parallel, so as to avoid the use of synchronous toothed belts in the vibration excitation mechanism of the oscillating vibration wheel, resulting in lower Work reliability and service life; ensure that the transmission center distance of the two synchronous gears does not change when the eccentric shaft in the excitation mechanism of the vertical vibrating wheel rotates, so that the vertical vibration and oscillating vibratory rollers can be truly industrially applied.

The purpose of the present invention is achieved like this: the synchronous codirectional drive mechanism of two eccentric shafts installed in parallel in the vibration wheel is changed from a synchronous toothed belt drive mechanism to a synchronous codirectional gear drive mechanism, and the synchronous gear avoids direct installation On the eccentric shaft; the two synchronous gears of the two eccentric shafts installed in parallel in the vertical vibrating wheel also avoid being directly installed on the eccentric shaft. The specific method is: design a synchronous gearbox, install synchronous gears and Transmission gear, the output end of each synchronous gear is connected to the input end of the corresponding eccentric shaft through a coupling or other compact structure, which can transmit torque at a constant speed and has a certain degree of flexibility. The transmission center distance of the synchronous gear The shaft spacing of the two eccentric shafts is completely equal; the installation base plate of the synchronous gearbox is correspondingly positioned on the vibration bearing seat at the input end of the two eccentric shafts and installed on the two ends of the inner hole of the vibration wheel. The installation base plate of the synchronous gear box The positioning method of the vibration bearing seat can be a notch boss, a positioning sleeve or other methods to ensure the accuracy of the assembly position of the two synchronous gears and the two eccentric shafts. Due to the eccentricity of each synchronous gear and its corresponding drive The connection between the shafts is realized by a flexible coupling, which completely avoids the change of the transmission center distance of the synchronous gear and The meshing state keeps the transmission center distance and meshing state of the two synchronous gears unchanged at the initial installation accuracy.

The accompanying drawings of the present invention are as follows:

Description of Figure 1:

1—travel motor 2—shock absorber 3—vibration wheel body 4—vibrator shell

5—eccentric shaft 6—eccentric block 7—vibration bearing 8—vibration bearing seat

9—synchronous gear 10—synchronous gear 11—transmission gear 12—input gear

13—vibration motor 14—coupling 15—vibration output bearing

16—vibration output bearing seat 17—frame

Fig. 2 is a sectional view at A-A of Fig. 1

Description of Figure 3:

f: Radial clearance of vibration bearing 7

d: the distance between the two eccentric shafts 5 at rest, and also the center distance between the two synchronous gears 9 and 10 at rest

β: The deflection generated when the eccentric shaft 5 rotates causes the rotation angle of the two supporting ends of the eccentric shaft 5

Description of Figure 4:

21—oscillating motor 22—central shaft 23—synchronous toothed belt

25—Central shaft bearing seat

Figure 5 is a sectional view at B-B of Figure 4

Fig. 1 and Fig. 2 are the typical structure diagrams of the vertical vibrating wheel provided by the prior art, the travel motor 1 is installed on the frame 17, the travel motor 1 is connected with the vibrating wheel body 3 through the shock absorber 2, and the exciter shell Vibration output bearings 15 are assembled on the shaft heads at both ends of the body 4, and the vibration output bearings 15 are installed in the vibration output bearing seat 16, and the vibration output bearing seat 16 is then assembled on the two ends of the inner hole of the vibrating wheel body 3. One end of the shaft head of the vibrator housing 4 is connected with the frame 17 through the shock absorber 2, and the two eccentric shafts 5 with the eccentric block 6 are installed in parallel in the horizontal direction through the vibrating bearing 7 and the vibrating bearing seat 8. In the exciter housing 4, the so-called relative installation means that the two eccentric shafts 5 with eccentric blocks 6 are arranged symmetrically in the horizontal direction on both sides of the rotation axis of the exciter housing 4, and the two eccentric shafts 5 The initial phase angles of the eccentric block 6 are equal, the synchronous gear 9 and the synchronous gear 10 and the transmission gear 11 (the synchronous gear 10 and the transmission gear 11 are dual gears) are directly installed on the eccentric shaft 5, the synchronous gear 9 and the synchronous gear 10 The number of teeth is equal, the transmission gear 11 meshes with the input gear 12, and the input gear 12 is connected with the vibration motor 13 through a coupling 14. The working process of the vertical vibrating wheel (shown in accompanying drawing 1) provided by the prior art is: the vibrating motor 13 drives the input gear 12 to rotate through the shaft coupling 14, and the input gear 12 meshes to drive the transmission gear 11 and the synchronous gear 10 to rotate, and the synchronous gear 10 meshes and drives the synchronous gear 9 to rotate at a constant speed opposite to the direction of rotation of the synchronous gear 10, that is, the synchronous gear 9 and the synchronous gear 10 drive the two eccentric shafts 5 to perform synchronous reverse rotation, because the eccentric blocks of the two eccentric shafts 5 6 are installed relative to each other in the horizontal direction, and because the exciter housing 4 does not rotate, the excitation forces of the eccentric blocks 6 on the two eccentric shafts 5 in the horizontal direction cancel each other out, and only the excitation force in the vertical direction is generated. The vibration force is transmitted to the vibration wheel body 3 through the vibration output bearing 15 and the vibration output bearing seat 16, so that the vibration wheel body 3 only vibrates in the vertical direction. Fig. 3 is a schematic diagram of four vibration bearings 7, two eccentric shafts 5 and two synchronous gears 9, 10 in Fig. 1 when they are initially installed and two typical working conditions during operation. Fig. 3 (a) is four vibrating bearings 7, two eccentric shafts 5 and two synchronous gears 9, 10 in static state, and the distance between two eccentric shafts 5 is d, because the two synchronous gears 9, 10 It is directly installed on the two eccentric shafts 5, so the transmission center distance of the two synchronous gears 9, 10 is also d, and the radial clearance f of the vibrating bearing 7 is evenly and symmetrically distributed. Figure 3(b) shows the variation of the axial distance between the two eccentric shafts 5 and the sum of their deflections when the phase angles of the eccentric blocks 6 of the two eccentric shafts 5 rotate outward to the phase angles of the eccentric blocks 6 on the two eccentric shafts 5 differ by 180° Schematic diagram of the working condition of the meshing state of the synchronous gears 9 and 10. At this time, due to the offset of the radial clearance f of the vibration bearing 7, the distance between the two eccentric shafts 5 increases from d to d+2f, and the two eccentric shafts The deflection generated by 5 causes the rotation angle β when the shaft head of the synchronous gear 9, 10 is installed, and the transmission center distance of the two synchronous gears 9, 10 is also increased to d+2f, and the rotation axis of the two synchronous gears 9, 10 It also changes from a parallel state to a cross state (inward turning angle 2β). Figure 3(c) shows the variation of the axial distance between the two eccentric shafts 5 and the deflection of the two eccentric shafts 5 and the synchronous gears 9 and 10 when the phase angle of the eccentric block 6 on the two eccentric shafts 5 is screwed inwardly and the phase angle of the eccentric block 6 differs by 180°. Schematic diagram of the working condition of the meshing state. At this time, the distance between the two eccentric shafts 5 is reduced from d to d-2f. The deflection produced by the two eccentric shafts 5 causes the rotation angle β on the shaft heads where the synchronous gears 9 and 10 are installed, and When the transmission center distance of the two synchronous gears 9, 10 is also reduced to d-2f, the rotation axes of the two synchronous gears 9, 10 also change from the parallel state to the cross state (outward rotation angle 2β).

Fig. 4 and Fig. 5 are the typical structural schematic diagrams of the vibrating wheel provided by the prior art, the central shaft 22 is installed on the centerline of rotation of the vibrating wheel body 3 through the central shaft bearing seat 25, and two eccentric shafts 5 are symmetrically arranged in parallel on the central shaft The two sides of 22 are installed on the inner cavity web plate of the vibration wheel body 3 through the vibration bearing 7 and the vibration bearing seat 8, the eccentric block 6 is fixed on the eccentric shaft 5, and the eccentric block 6 on the two eccentric shafts 5 is initially installed The phase angles differ by 180°, the input end of the central shaft 22 is connected to the oscillating motor 21, two synchronous toothed belts 23 are respectively assembled on the central shaft 22 and two eccentric shafts 5, and the frame 17 passes through the shock absorber 2 and the vibrating wheel The width plates of the body 3 are connected, and the working process of the oscillating vibration wheel (shown in Figure 4 ) provided by the prior art is: the oscillating motor 21 drives the central shaft 22 to rotate, and the central shaft 22 drives two eccentric shafts through a synchronous shaft-shaped belt 23 5 for synchronous reverse rotation, since the phase angle difference of the eccentric blocks 6 on the two eccentric shafts 5 is guaranteed to be 180° when the two eccentric shafts 5 are installed, the centrifugal force generated by the eccentric blocks 6 of the two eccentric shafts 5 is a pair Parallel and opposite force couple, the force couple acts on the vibrating wheel body 3 through the vibrating bearing 7 and the vibrating bearing seat 8 to make the vibrating wheel body 3 swing back and forth around the central axis 22, that is, oscillating vibration.

Figure 6 explains:

18—coupling 19—synchronous gearbox

Fig. 7 is the partial enlarged view of Fig. 6 at I place,

N: The positioning boss on the bottom plate where the synchronous gearbox 19 is installed,

M: The positioning notch on the vibration bearing seat 8,

Fig. 8 is a transmission schematic diagram of the synchronous gears 9 and 10 in Fig. 6 driving the eccentric shaft 5 through the coupling 18,

Figure 9 illustrates:

29—Shell-shaped central half shaft 30—Central slewing bearing 31—Central slewing bearing housing

Fig. 6 is a synchronous driving method and a typical synchronous driving mechanism embodiment of the synchronous driving method provided by the present invention and a typical synchronous driving mechanism. A synchronous gear box 19, synchronous gears 9, 10 and transmission gear 11 are installed in the synchronous gear box 19, the transmission center distance of the synchronous gears 9, 10 is equal to the installation axis distance of the two vibration eccentric shafts 5, the installation base plate of the synchronous gear box 19 A positioning boss N is processed on the top, and a positioning notch M is processed on the vibrating bearing seat 8. The synchronous gearbox 19 is positioned and installed on the positioning notch on the vibrating bearing seat 8 and the positioning boss on the synchronous gearbox 19 installation base plate. On the two ends of the inner hole of the vibrating wheel body 3, the positioning of the mounting base plate of the synchronous gear box 19 and the vibrating bearing seat 8 can also be in other ways, and the coupling 18 realizes the transmission of the eccentric shaft 5 and the synchronous gears 9, 10. The coupling, the coupling 18 is a coupling device with a compact structure, can transmit torque at a constant speed, and has a certain degree of flexibility. The gap should be determined according to the clearance of the vibrating bearing 7 and the amount of deflection variation of the eccentric shaft 5 when it rotates. The embodiment of synchronous driving method and typical synchronous driving mechanism of multiple eccentric shafts installed in parallel as shown in Figure 6. Other structures of the typical structure of the vertical vibrating wheel schematic diagram and the typical structure of the vertical vibrating wheel provided by the prior art shown in Figure 1 The same, without going into details, the synchronous driving method and the embodiment of the typical synchronous driving mechanism provided by the present invention The working process of the vertical vibrating wheel is: the vibrating motor 13 rotates the input gear 12 through the shaft coupling 14, and the input The gear 12 meshes to drive the transmission gear 11 to rotate the synchronous gear 10, and the synchronous gear 10 meshes to drive the synchronous gear 9 to rotate synchronously and reversely. Two eccentric shafts 5 rotate in opposite directions synchronously to generate vertical vibration force. Figure 8(u) is a schematic diagram of the installation and connection of four vibration bearings 7, two eccentric shafts 5, two synchronous gears 9, 10, and two shaft couplings 18 in a static state in Figure 6. In a static state or initial installation When the interaxial spacing of two eccentric shafts 5 and the center distance of two synchronous gears 9 and 10 are completely equal to d; Fig. 8 (v) is that the eccentric blocks 6 of the two eccentric shafts 5 in Fig. 6 are outwardly rotated to two When the phase angle of the eccentric block 6 differs by 180°, the schematic diagram of the change of the radial clearance of the four vibration bearings 7 and the meshing state of the two synchronous gears 9 and 10. At this time, due to the centrifugal force of the two eccentric blocks 6, The radial clearance of the four vibrating bearings 7 presents a unilateral distribution, and the distance between the two eccentric shafts 5 increases from d to d+2f. At the same time, the deflection of the two eccentric shafts 5 also causes the rotation angle β of the shaft head, because The synchronous gears 9, 10 are connected with the eccentric shaft 5 through the shaft coupling 18, so the transmission center distance d of the two synchronous gears 9, 10 remains unchanged, and the meshing state also remains unchanged; Fig. 8(w) is the When the eccentric blocks 6 of the two eccentric shafts 5 are screwed inward until the phase angles of the two eccentric blocks 6 differ by 180°, the radial clearance changes of the four vibration bearings 7, the deflection changes of the two eccentric shafts 5 and the two Schematic diagram of the meshing state of the synchronous gears 9 and 10. At this time, the distance between the two eccentric shafts 5 is reduced from d to d-2f. At the same time, the deflection of the two eccentric shafts 5 also causes the rotation angle β of the shaft head, but due to The synchronous gears 9, 10 are connected with the eccentric shaft 5 through the shaft coupling 18, so the transmission center distance d and the meshing state of the two synchronous gears 9, 10 remain unchanged. Fig. 9 is a typical structural schematic diagram of a synchronous driving method and a typical synchronous driving mechanism embodiment of a synchronous driving method and a typical synchronous driving mechanism provided by the present invention. Two eccentric shafts 5 are installed on the vibration bearings through four vibration bearings 7 in parallel. In the seat 8, the initial phase angles of the eccentric blocks 6 on the two eccentric shafts 5 differ by 180°, and the vibration bearing seat 8 is installed in the vibration spoke plate 32. At the input ends of the two eccentric shafts 5 installed in parallel, the design And install a synchronous gear box 19, two synchronous gears 9,10 and input gear 12 are all installed in the synchronous gear box 19, the number of teeth of the synchronous gears 9,10 is equal, the synchronous gear box 19 is positioned at the vibration bearing seat 8 ends and Fastened on the vibration spoke plate 32, the two synchronous gears 9 and 10 are connected with the two eccentric shafts 5 through the coupling 18, and the center distance between the two synchronous gears 9 and 10 is equal to the axis of the two eccentric shafts 5 spacing, the two shell-shaped central half-shafts 29 are positioned and installed on the vibrating spoke plate 32, the central slewing bearing seat 31 is installed on the shell-shaped central half-shaft 29 through the central slewing bearing 30, and the central slewing bearing seat 31 passes through the shock absorber 2 is connected with the frame 17, and the oscillating motor 21 is installed on the shell-shaped central half shaft 29, and the oscillating motor 21 is connected with the input gear 12 through the coupling 14. The synchronous driving method and typical synchronous driving mechanism embodiment of the synchronous driving method and the typical synchronous driving mechanism shown in Fig. 9 are: the oscillating motor 21 drives the input gear 12 to rotate through the shaft coupling 14, and the input gear 12 meshes at the same time Drive two synchronous gears 9 and 10 to rotate synchronously and in the same direction, and the two synchronous gears 9 and 10 respectively drive two eccentric shafts 5 to rotate synchronously and in the same direction through the coupling 18. Since the eccentric blocks 6 of the two eccentric shafts 5 The initial phase angle difference of 180°, so two eccentric shafts 5 only produce a pair of force couples, the force couples are transmitted to the vibration wheel spoke plate 32 through the vibration bearing 7 and the vibration bearing seat 8, so that the vibration wheel body 3 revolves around the central slewing bearing seat 31 for oscillating vibration, since the two synchronous gears 9 and 10 are connected through the coupling 18 and the two eccentric shafts 5, so the change of the axial distance and the change of the deflection of the two eccentric shafts 5 will not affect the two The meshing state between the synchronizing gears 9, 10 and the input gear 12.

Realization of the present invention: design the synchronous drive gearbox, pay attention to the helical relationship of two synchronous gears, provide the synchronous drive method and the embodiment of typical synchronous drive mechanism of the parallel installation of many eccentric shafts according to the present invention vertical vibrating wheel (Fig. 6 and Shown in Figure 7) and the typical structural principle diagram of the vibrating vibration wheel (shown in Figure 9), according to the prior art and manufacturing process, the manufacturing work of the embodiment of the present invention can be realized.

The embodiment provided by the present invention can be transformed into a synchronous driving method and a synchronous driving mechanism applied to the parallel installation and connection of more than two eccentric shafts.

Advantages of the present invention: the synchronous driving method of multiple eccentric shafts provided by the present invention is scientific, practical, simple and feasible, and the typical structural mechanism of synchronous driving of multiple eccentric shafts provided by the present invention is simple, compact, reliable and easy to manufacture.

Claims (3)

1. A synchronous drive method for multiple eccentric shafts installed in parallel, characterized in that: at the driving end of multiple eccentric shafts installed in parallel, a synchronous gearbox is designed and manufactured, and the synchronous gearbox is positioned at the drive of multiple eccentric shafts installed in parallel The vibration bearing seat at the end of the vibration wheel is installed on the web plate at both ends of the inner hole of the vibration wheel. The center distance between multiple synchronous gears is equal to the corresponding axial distance between the multiple eccentric shafts driven by them. The shaft coupling or other compact, flexible, and constant-speed torsion-transmitting couplings are used to realize the transmission connection between the shafts, avoiding the direct installation of synchronous gear drive mechanisms on the two eccentric shafts; avoiding the use of synchronous toothed belts Drives multiple eccentric shafts. 2. A typical synchronous drive mechanism with multiple eccentric shafts installed in parallel, mainly including two eccentric shafts (5), vibrating bearings (7), vibrating bearing housings (8), synchronous gears (9), (10) and driving gear (11), vibration bearings (7) are installed at both ends of the eccentric shaft (5), the vibration bearings (7) are installed in the vibration bearing seat (8), and the vibration bearing seat (8) is installed in the vibration The two eccentric shafts (5) are respectively driven by the synchronous gears (9) and (10) on the width plates at the two ends of the inner hole of the wheel body (3). It is characterized in that a synchronous gearbox (19) is designed and manufactured, and the synchronous gears (9), (10) and driving gear (11) are installed in the synchronous gear box (19), and the synchronous gear box (19) is positioned at the end of vibration bearing seat (8) and is installed on the vibration wheel body (3) On the width plates at the two ends of the inner hole, the center distance of the synchronous gears (9), (10) is equal to the axial spacing when the two eccentric shafts (5) are installed, and the synchronous gears (9), (10) and the two eccentric shafts ( 5) The transmission connection between all is carried out by shaft coupling (18). 3. A typical synchronous drive mechanism with multiple eccentric shafts installed in parallel according to claim 2, characterized in that: the coupling (18) is a coupling device with a compact structure, capable of transmitting torque at a constant speed, and having certain flexibility , when the coupling (18) is an meshing gear coupling or clutch, the clearance of the meshing transmission pair of the coupling (18) should be based on the clearance of the vibrating bearing (7) and the rotation of the eccentric shaft (5) The time deflection change is determined.

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