CN216430408U - Gear transmission mechanism of press machine - Google Patents

Abstract

The utility model relates to a press technical field discloses a gear drive of press, include: a main shaft on which a driving gear is arranged; the first herringbone gear eccentric wheel component comprises a first gear hub, a first helical gear and a second helical gear which are separated, the first helical gear and the second helical gear are connected at two ends of the first gear hub, and the first gear hub, the first helical gear and the second helical gear are eccentrically arranged; the first bevel gear and/or the second bevel gear are/is meshed with the driving gear; the second herringbone gear eccentric wheel component comprises a second gear hub, a third bevel gear and a fourth bevel gear which are separated, the third bevel gear and the fourth bevel gear are connected to two ends of the second gear hub, and the second gear hub, the third bevel gear and the fourth bevel gear are eccentrically arranged; the third helical gear is meshed with the first helical gear, and the fourth helical gear is meshed with the second helical gear. The utility model has the advantages of, this gear drive can be applicable to the occasion of high-speed, high accuracy requirement, and its processing, assembly precision are high.

Description

Gear transmission mechanism of press machine

Technical Field

The utility model relates to a press technical field especially relates to a gear drive of press.

Background

Presses are common devices in the mechanical field and can be classified into various types according to power sources, such as: hydraulic, pneumatic, crank and shell presses, and the like. Among them, for crank-open presses, the gear train is the most central power transmission component.

A traditional transmission mechanism of the double-point eccentric gear press adopts a straight gear train, but the straight gear has the problems of limited bearing capacity and high noise under the working conditions of high speed and large stroke, and the conditions of high precision and high speed use requirements are difficult to meet. In order to simplify the structure of a transmission mechanism of a double-point eccentric gear press, in the existing two-meshing gear set, an eccentric wheel and a gear are generally arranged in an integrated mode, but the processing precision and the phase position of the eccentric wheel and the gear are difficult to guarantee.

SUMMERY OF THE UTILITY MODEL

The above-mentioned not enough to prior art exists, the utility model discloses the technical problem that will solve lies in: a gear transmission mechanism applicable to a press machine with high speed, high precision and high machining and assembling precision is provided.

The utility model provides a technical scheme that its technical problem adopted is, provides a gear drive of press, include:

the main shaft is provided with a driving gear;

the first herringbone gear eccentric wheel component comprises a first gear hub, a first helical gear and a second helical gear which are arranged in a split manner, wherein the first helical gear and the second helical gear are respectively connected to two ends of the first gear hub, and the first gear hub, the first helical gear and the second helical gear are arranged in an eccentric manner; the first bevel gear and/or the second bevel gear are/is meshed with the driving gear, and the gear teeth of the first bevel gear and the second bevel gear are inclined in opposite directions;

the second herringbone gear eccentric wheel component comprises a second gear hub, a third bevel gear and a fourth bevel gear which are arranged in a split manner, the third bevel gear and the fourth bevel gear are respectively connected to two ends of the second gear hub, and the second gear hub, the third bevel gear and the fourth bevel gear are arranged in an eccentric manner; the gear teeth of the third helical gear and the fourth helical gear are opposite in inclination direction, the third helical gear is meshed with the first helical gear, and the fourth helical gear is meshed with the second helical gear.

Further, the first gear hub is provided with a first eccentric wheel, and the second gear hub is provided with a second eccentric wheel;

the phase positions of the first eccentric wheel relative to the first helical gear and the second helical gear are the same as the phase positions of the second eccentric wheel relative to the third helical gear and the fourth helical gear.

Furthermore, the first helical gear, the second helical gear, the third helical gear and the fourth helical gear are all provided with a balancing weight, and the positions of the balancing weights are opposite to the protruding directions of the first eccentric wheel and the second eccentric wheel.

Furthermore, two driving gears are arranged on the main shaft, one driving gear is meshed with the first bevel gear, and the other driving gear is meshed with the second bevel gear.

Furthermore, the two driving gears are also helical gears, the inclination directions of the gear teeth on the two driving gears are opposite, the two driving gears form a herringbone gear structure, the first helical gear and the second helical gear form a herringbone gear structure, and the third helical gear and the fourth helical gear form a herringbone gear structure.

Further, the first gear hub and the second gear hub are both rotatably connected with a main connecting rod.

Furthermore, the first helical gear is sleeved at one end of the first gear hub, and the second helical gear is sleeved at the other end of the first gear hub; the third helical gear is sleeved at one end of the second gear hub, and the fourth helical gear is sleeved at the other end of the second gear hub;

connecting pins for transmitting torque are arranged between the first gear hub and the first helical gear, between the first gear hub and the second helical gear, between the second gear hub and the third helical gear and between the second gear hub and the fourth gear hub;

the first helical gear, the second helical gear, the third helical gear and the fourth helical gear are all abutted against the first gear hub or the second gear hub through a fixing nut.

Furthermore, the first herringbone gear eccentric wheel component further comprises a first central shaft, the second herringbone gear eccentric wheel component further comprises a second central shaft, and the first central shaft, the second central shaft and the main shaft are arranged in parallel;

the first gear hub is sleeved on the first central shaft and can rotate around the first central shaft; the second gear hub is sleeved on the second central shaft and can rotate around the second central shaft.

The utility model discloses gear drive's assembly method is applied to the gear drive of foretell press to go on with the help of an auxiliary frame, assembly method including:

mounting the assembled main shaft and the assembled driving gear on the auxiliary frame;

respectively installing a first bevel gear and a second bevel gear at two ends of a first gear hub, and adjusting the phase of the first gear hub relative to the first bevel gear and the phase of the second bevel gear to be equal; the first herringbone gear eccentric wheel assembly is installed on the auxiliary rack through a first central shaft, and the first helical gear and the second helical gear are respectively meshed with a driving gear;

respectively installing a third helical gear and a fourth helical gear at two ends of a second gear hub, and adjusting the phase of the second gear hub relative to the third helical gear and the fourth helical gear to enable the phase to be equal; a second herringbone eccentric wheel assembly is arranged on the auxiliary machine frame through a second central shaft, a third bevel gear is meshed with the first bevel gear, and a fourth bevel gear is meshed with the second bevel gear; and the phase of the second gear hub relative to the third helical gear and the fourth helical gear is adjusted to be equal to the phase of the first gear hub relative to the first helical gear and the second helical gear.

Further, after the main shaft, the first herringbone-toothed eccentric wheel assembly and the second herringbone-toothed eccentric wheel assembly are mounted on the auxiliary frame, the positions of the first helical gear, the second helical gear, the third helical gear and the fourth helical gear can be adjusted by adjusting the fixing nut.

Compared with the prior art, the utility model discloses following beneficial effect has at least:

in the utility model, a first herringbone gear eccentric wheel component is formed by assembling a first helical gear and a second helical gear which have two opposite gear inclination directions at two ends of a first gear hub respectively; the second herringbone-tooth eccentric wheel component is formed by respectively assembling a third bevel gear and a fourth bevel gear which have two gear teeth with opposite inclination directions at two ends of a second gear hub to form another herringbone-tooth eccentric wheel structure; the first herringbone gear eccentric wheel component, the second eccentric wheel component and the main shaft are assembled to form the double-point herringbone gear eccentric gear transmission mechanism, and the double-point herringbone gear eccentric gear transmission mechanism is applicable to a press machine with high precision and high speed requirements. In addition, the first herringbone-toothed eccentric wheel component and the second herringbone-toothed eccentric wheel component in the scheme are both arranged in a split mode instead of a traditional integrated mode, the machining precision of each helical gear can be effectively guaranteed, the phases of the first eccentric wheel relative to the first helical gear and the second helical gear can be conveniently adjusted, the phases of the second eccentric wheel relative to the third helical gear and the fourth helical gear can be adjusted, the phases of the first eccentric wheel and the second eccentric wheel are further enabled to be the same, the machining precision of the helical gears is guaranteed, the assembling precision of the transmission mechanism is guaranteed through the split mode, when the gear transmission mechanism is installed into the auxiliary rack, the phase of the second eccentric wheel in the second herringbone-toothed eccentric wheel component can be adjusted through adjusting, the phase of the first eccentric wheel is matched, and the phase of the first eccentric wheel and the phase of the second herringbone-toothed eccentric wheel are guaranteed to be consistent. The four transmission bevel gears are provided with the balancing weights along the opposite direction of the protruding extension directions of the first eccentric wheel and the second eccentric wheel, so that the stability of the transmission mechanism is ensured in the high-speed rotation process of the transmission mechanism.

Drawings

Fig. 1 is a schematic structural view of the gear transmission mechanism of the present invention;

FIG. 2 is an assembled schematic view of a first herringbone gear eccentric wheel assembly and a second herringbone gear eccentric wheel assembly;

FIG. 3 is a front view of FIG. 2;

FIG. 4 is a schematic view of the gear assembly after it has been installed in the subframe;

FIG. 5 is a bottom view of FIG. 4;

FIG. 6 is a left side view of FIG. 4;

FIG. 7 is a partial cross-sectional view of the gear assembly after it has been installed in the subframe;

FIG. 8 is a schematic view of the assembly of the main shaft and the first herringbone eccentric wheel assembly;

FIG. 9 is a schematic structural diagram of the first herringbone gear eccentric wheel assembly or the second herringbone gear eccentric wheel assembly.

In the figure, the position of the upper end of the main shaft,

1. a main shaft; 10. a driving gear; 11. a front bearing seat; 12. a front bearing; 13. a flywheel shaft is connected with the flywheel; 14. a rear bearing;

2. a first herringbone gear eccentric wheel component; 20. a first gear hub; 201. a first eccentric wheel; 21. a first helical gear; 22. a second helical gear; 23. a first central shaft; 230. a balancing weight; 231. a main link;

3. a second herringbone gear eccentric wheel component; 30. a second gear hub; 301. a second eccentric wheel; 31. a third bevel gear; 32. a fourth helical gear; 33. a second central axis;

4. a connecting pin;

5. fixing a nut;

6. and an auxiliary frame.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.

Furthermore, the descriptions in the present application as to "first," "second," "a," etc. are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit ly indicating a number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present application, unless expressly stated or limited otherwise, the terms "connected" and "fixed" are to be construed broadly, e.g., "fixed" may be fixedly connected or detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In addition, the technical solutions between the embodiments of the present invention can be combined with each other, but it is necessary to be able to be realized by a person having ordinary skill in the art as a basis, and when the technical solutions are contradictory or cannot be realized, the combination of such technical solutions should be considered to be absent, and is not within the protection scope of the present invention.

The first embodiment is as follows:

as shown in fig. 1 to 3 and fig. 8 to 9, a gear transmission mechanism of a press machine includes: the device comprises a main shaft 1, a first herringbone-tooth eccentric wheel component 2 and a second herringbone-tooth eccentric wheel component 3. Wherein: the device comprises a main shaft 1, wherein a driving gear 10 is arranged on the main shaft 1, and two driving gears 10 are arranged on the main shaft 1; the first herringbone gear eccentric wheel component 2 comprises a first gear hub 20, a first helical gear 21 and a second helical gear 22 which are arranged in a split manner, wherein the first helical gear 21 and the second helical gear 22 are respectively connected to two ends of the first gear hub 20, and the first gear hub 20, the first helical gear 21 and the second helical gear 22 are arranged in an eccentric manner; specifically, a first eccentric wheel 201 is arranged on the first gear hub 20, the first eccentric wheel 201 belongs to a part of the first gear hub 20, a sleeve extends from two ends of the first gear hub 20, a first helical gear 21 and a second helical gear 22 are respectively sleeved on the sleeve, the first eccentric wheel 201 is located between the first helical gear 21 and the second helical gear 22, the first helical gear 21 and the second helical gear 22 are symmetrically arranged at two ends of the first eccentric wheel 201, in the high-speed rotation process, the centrifugal force of the first eccentric wheel 201 is large, and the first helical gear 21 and the second helical gear 22 are symmetrically arranged to ensure the stress balance of the first herringbone eccentric wheel assembly 2. The first bevel gear 21 and/or the second bevel gear 22 are/is meshed with the driving gear 10, in other words, when one driving gear 10 is provided, the driving gear may be meshed with the first bevel gear 21 or meshed with the second bevel gear 22, in the present solution, it is optimal that two driving gears 10 are provided on the main shaft 1, one driving gear 10 is meshed with the first bevel gear 21, the other driving gear 10 is meshed with the second bevel gear 22, the two driving gears 10 are respectively meshed with and drive the first bevel gear 21 and the second bevel gear 22, so as to ensure meshing balance, and the gear teeth of the first bevel gear 21 and the second bevel gear 22 are opposite in inclination direction; namely, the first helical gear 21 and the second helical gear 22 form a herringbone gear structure in space, which can bear larger load compared with the conventional straight gear, and has smooth meshing and low noise. The second herringbone-tooth eccentric wheel assembly 3 comprises a second gear hub 30, a third bevel gear 31 and a fourth bevel gear 32 which are arranged in a split manner, the third bevel gear 31 and the fourth bevel gear 32 are respectively connected to two ends of the second gear hub 30, similarly, the second gear hub 30 is provided with a second eccentric wheel 301, the second eccentric wheel 301 belongs to one part of the second gear hub 30, two ends of the second gear hub 30 respectively protrude out of sleeves, the third bevel gear 31 and the fourth bevel gear 32 are respectively sleeved on the sleeves at two ends of the second gear hub 30, and the second gear hub 30, the third bevel gear 31 and the fourth bevel gear 32 are both arranged in an eccentric manner; the gear teeth of the third helical gear 31 and the fourth helical gear 32 are inclined in opposite directions, the third helical gear 31 is engaged with the first helical gear 21, and the fourth helical gear 32 is engaged with the second helical gear 22.

The first helical gear 21 and the second helical gear 22 form a herringbone gear structure, the third helical gear 31 and the fourth helical gear 32 form a herringbone gear structure, that is, the first helical gear 21, the second helical gear 22, the third helical gear 31 and the fourth helical gear 32 form a double-point herringbone gear eccentric gear transmission mechanism of the present invention, further, both the two driving gears 10 are helical gears, the gear teeth of the two driving gears 10 are in opposite directions of inclination, and the two driving gears 10 also form a herringbone gear structure. The phase of the first eccentric 201 relative to the first helical gear 21 and the second helical gear 22 is the same as the phase of the second eccentric 301 relative to the third helical gear 31 and the fourth helical gear 32.

In practical use, in the gear transmission mechanism of the press machine, the first herringbone gear eccentric wheel component 2 is respectively assembled at two ends of the first gear hub 20 through the first helical gear 21 and the second helical gear 22 with two opposite gear inclining directions, so that a herringbone gear eccentric wheel structure is formed; the second herringbone-tooth eccentric wheel component 3 is formed by respectively assembling a third bevel gear 31 and a fourth bevel gear 32 with two opposite bevel directions of teeth on two ends of a second gear hub 30 to form another herringbone-tooth eccentric wheel structure; the first herringbone gear eccentric wheel component 2, the second eccentric wheel component 301 and the main shaft 1 are assembled to form the double-point herringbone gear eccentric gear transmission mechanism, and the double-point herringbone gear eccentric gear transmission mechanism is applicable to a press machine with high precision and high speed requirements. In the scheme, the first herringbone-tooth eccentric wheel component 2 and the second herringbone-tooth eccentric wheel component 3 are both arranged in a split way instead of the traditional integrated arrangement, the processing precision of each bevel gear can be effectively ensured, the phase position of the first eccentric wheel 201 relative to the first bevel gear 21 and the second bevel gear 22 can be conveniently adjusted, and adjusting the phase of the second eccentric 301 relative to the third helical gear 31 and the fourth helical gear 32, further making the phases of the two identical, not only ensures the processing precision of the helical gear, but also ensures the assembly precision of the transmission mechanism by split arrangement and the auxiliary frame 6, when the gear transmission mechanism is installed in the auxiliary frame 6, by adjusting the phase of the second eccentric wheel 301 in the second double helical gear eccentric wheel assembly 3, the phase position of the first eccentric wheel 201 is matched, the phase position of the first eccentric wheel and the phase position of the second eccentric wheel are consistent, and the transmission accuracy of the transmission mechanism is guaranteed. The herringbone teeth are difficult to process and measure, and the double-point herringbone tooth eccentric gear transmission mechanism can effectively solve the problem according to the technical requirements that the traditional transmission mechanism cannot meet processing, assembling and the like, ensures the processing and assembling precision and the transmission quality, and is suitable for a high-precision and high-speed press machine.

As shown in fig. 1 and 4, the first helical gear 21, the second helical gear 22, the third helical gear 31 and the fourth helical gear 32 are all provided with a weight block 230, the weight block 230 is located at a position opposite to the protruding direction of the first eccentric wheel 201 and the second eccentric wheel 301, and the first gear hub 20 and the second gear hub 30 are both rotatably connected with a main connecting rod 231. In the working process of the gear transmission mechanism, the balancing weights 230 are arranged on the four transmission helical gears along the opposite direction of the protruding extending direction of the first eccentric wheel 20 and the protruding extending direction of the second eccentric wheel, so that the stability of the transmission mechanism is ensured in the process of high-speed rotation of the transmission mechanism. It should be explained that, the first bevel gear 21 and the second bevel gear 22 are provided with a counterweight 230 in a direction opposite to the protruding direction of the first eccentric wheel 201, and the counterweight 230 can effectively balance the centrifugal force during the high-speed rotation of the first eccentric wheel 201, so as to ensure the balance of the first herringbone gear eccentric wheel assembly 2; the third bevel gear 31 and the fourth bevel gear 32 are provided with a balancing weight 230 in a direction opposite to the protruding direction of the second eccentric wheel 301, and the balancing weight 230 can effectively balance the centrifugal force of the second eccentric wheel 301 during the high-speed rotation process, so as to ensure the balance of the second double helical gear eccentric wheel assembly 3.

As shown in fig. 4 and fig. 6 to 9, the first bevel gear 21 is sleeved on one end of the first gear hub 20, and the second bevel gear 22 is sleeved on the other end of the first gear hub 20; the third bevel gear 31 is sleeved at one end of the second gear hub 30, and the fourth bevel gear 32 is sleeved at the other end of the second gear hub 30; connecting pins 4 for transmitting torque are arranged between the first gear hub 20 and the first helical gear 21, between the first gear hub 20 and the second helical gear 22, between the second gear hub 30 and the third helical gear 31, and between the second gear hub 30 and the fourth gear hub; i.e. four drive bevel gears, are provided with connecting pins 4 for transmitting torque. The first helical gear 21, the second helical gear 22, the third helical gear 31 and the fourth helical gear 32 are all tightly pressed against the first gear hub 20 or the second gear hub 30 through a fixing nut 5. When the phase positions of the first eccentric wheel 201 and the second eccentric wheel 301 are actually adjusted, the fixing nut 5 can be loosened to adjust, and then the fixing nut 5 is screwed after the fixing nut 5 is adjusted to meet the use requirement, so that the adjustment is convenient. The first herringbone tooth eccentric wheel assembly 2 further comprises a first central shaft 23, the second herringbone tooth eccentric wheel assembly 3 further comprises a second central shaft 33, and the first central shaft 23, the second central shaft 33 and the main shaft 1 are arranged in parallel, so that reliable power transmission is guaranteed, and loss is low. Wherein, the first gear hub 20 is sleeved on the first central shaft 23 and can rotate around the first central shaft 23; the second gear hub 30 is sleeved on the second central shaft 33 and can rotate around the second central shaft 33.

It should be further explained that the main shaft 1 is further provided with a front bearing seat 11, a front bearing 12, a flywheel shaft receiver 13 and a rear bearing 14, and the front bearing seat 11 and the flywheel shaft receiver 13 are respectively provided with the front bearing 12 and the rear bearing 14 therein for supporting the main shaft 1. The main shaft 1 assembly is fixed in the frame by a front bearing block 11 and a flywheel shaft bearing 13. The main shaft 1 can rotate freely, and drives the first herringbone gear eccentric wheel component to rotate through meshing of the herringbone gears. Thereby transmitting the power. That is, in the actual transmission process, the power element drives the main shaft 1 to rotate, the main shaft 1 is meshed with the first helical gear 21 and the second helical gear 22 through the driving gear 10, so as to drive the first herringbone-tooth eccentric wheel assembly 2 to rotate, then the first helical gear 21 is meshed with the third helical gear 31, the second helical gear 22 is meshed with the fourth helical gear 32, so as to drive the second herringbone-tooth eccentric wheel assembly 3 to rotate, the power is transmitted from the first eccentric wheel 201 and the second eccentric wheel 301, and the requirement of the press machine on the consistency of the power transmission is high, so that the phases of the first eccentric wheel 201 and the second eccentric wheel 301 are required to be consistent, and a good transmission effect can be ensured.

Example two:

as shown in fig. 4 to 9, a method for assembling a gear assembly applied to the gear assembly of the above press machine by means of an auxiliary frame 6 includes:

the assembled main shaft 1 and the driving gear 10 are arranged on the auxiliary frame 6; the main shaft 1 is supported on the auxiliary frame 6 through the front bearing 12, the rear bearing 14, the front bearing seat 11 and the flywheel shaft, and the structure is more compact and the occupied space is small because the main shaft is arranged at the bottom of the first herringbone gear eccentric wheel component 2 and the bottom of the second herringbone gear eccentric wheel component 3.

Mounting a first bevel gear 21 and a second bevel gear 22 at both ends of the first gear hub 20, respectively, and adjusting the phases of the first gear hub 20 with respect to the first bevel gear 21 and the second bevel gear 22 to be equal; the first herringbone gear eccentric wheel component 2 is arranged on the auxiliary frame 6 through a first central shaft 23, and the first bevel gear 21 and the second bevel gear 22 are respectively meshed with a driving gear 10; the first herringbone gear eccentric wheel component 2 is installed in the auxiliary rack 6 through a first central shaft 23 and can be meshed and driven by the main shaft 1, and the fixing nut 5 ensures that the first helical gear 21 and the second helical gear 22 cannot shift left and right, so that the structure is stable.

Mounting a third helical gear 31 and a fourth helical gear 32 on both ends of the second gear hub 30, respectively, and adjusting the phases of the second gear hub 30 with respect to the third helical gear 31 and the fourth helical gear 32 to be equal; and the second herringbone gear eccentric wheel assembly 3 is arranged on the auxiliary frame 6 through a second central shaft 33, a third bevel gear 31 is meshed with the first bevel gear 21, and a fourth bevel gear 32 is meshed with the second bevel gear 22; the phase of the second gear hub 30 relative to the third bevel gear 31 and the fourth bevel gear 32 is adjusted to be equal to the phase of the first gear hub 20 relative to the first bevel gear 21 and the second bevel gear 22. Compared with an integrated gear transmission mechanism, the gear transmission mechanism can be adjusted subsequently, and the condition that the gear transmission mechanism is not in place in machining can be compensated. Similarly, the second double helical gear eccentric wheel assembly 3 is mounted in the auxiliary frame 6 through the second central shaft 33.

During assembly, after the main shaft 1, the first double helical gear eccentric wheel assembly 2 and the second double helical gear eccentric wheel assembly 3 are mounted on the auxiliary frame 6, the position of the first helical gear 21 or the second helical gear 22 or the third helical gear 31 or the fourth helical gear 32 can be adjusted by adjusting the fixing nut 5.

In the scheme, the gear transmission mechanism can be applied to occasions of a press machine with high speed and high precision requirements, and is high in machining and assembling precision.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims (8)

1. A gear transmission mechanism of a press machine is characterized by comprising:

the main shaft is provided with a driving gear;

the first herringbone gear eccentric wheel component comprises a first gear hub, a first helical gear and a second helical gear which are arranged in a split manner, wherein the first helical gear and the second helical gear are respectively connected to two ends of the first gear hub, and the first gear hub, the first helical gear and the second helical gear are arranged in an eccentric manner; the first bevel gear and/or the second bevel gear are/is meshed with the driving gear, and the gear teeth of the first bevel gear and the second bevel gear are inclined in opposite directions;

the second herringbone gear eccentric wheel component comprises a second gear hub, a third bevel gear and a fourth bevel gear which are arranged in a split manner, the third bevel gear and the fourth bevel gear are respectively connected to two ends of the second gear hub, and the second gear hub, the third bevel gear and the fourth bevel gear are arranged in an eccentric manner; the gear teeth of the third helical gear and the fourth helical gear are opposite in inclination direction, the third helical gear is meshed with the first helical gear, and the fourth helical gear is meshed with the second helical gear.

2. The gear assembly of a press machine of claim 1, wherein said first gear hub has a first eccentric thereon, and said second gear hub has a second eccentric thereon;

the phase positions of the first eccentric wheel relative to the first helical gear and the second helical gear are the same as the phase positions of the second eccentric wheel relative to the third helical gear and the fourth helical gear.

3. The gear transmission mechanism of a press machine according to claim 2, wherein the first helical gear, the second helical gear, the third helical gear and the fourth helical gear are provided with a balancing weight, and the balancing weight is located at a position opposite to the protruding direction of the first eccentric wheel and the second eccentric wheel.

4. The gear transmission mechanism of a press machine according to claim 1, 2 or 3, wherein two driving gears are provided on said main shaft, and one of said driving gears is engaged with said first helical gear, and the other of said driving gears is engaged with said second helical gear.

5. The gear transmission mechanism of claim 4, wherein the two driving gears are also bevel gears, and the teeth of the two driving gears are inclined in opposite directions, the two driving gears form a herringbone gear structure, the first bevel gear and the second bevel gear form a herringbone gear structure, and the third bevel gear and the fourth bevel gear form a herringbone gear structure.

6. The gear assembly of a press machine of claim 1, wherein the first gear hub and the second gear hub each have a main link rotatably connected thereto.

7. The gear transmission mechanism of the press machine according to any one of claims 1 to 3, wherein the first helical gear is sleeved on one end of the first gear hub, and the second helical gear is sleeved on the other end of the first gear hub; the third helical gear is sleeved at one end of the second gear hub, and the fourth helical gear is sleeved at the other end of the second gear hub;

connecting pins for transmitting torque are arranged between the first gear hub and the first helical gear, between the first gear hub and the second helical gear, between the second gear hub and the third helical gear and between the second gear hub and the fourth gear hub;

the first helical gear, the second helical gear, the third helical gear and the fourth helical gear are all abutted against the first gear hub or the second gear hub through a fixing nut.

8. The gear transmission mechanism of a press machine as claimed in claim 7, wherein the first herringbone gear eccentric wheel assembly further comprises a first central shaft, the second herringbone gear eccentric wheel assembly further comprises a second central shaft, and the first central shaft, the second central shaft and the main shaft are arranged in parallel;

the first gear hub is sleeved on the first central shaft and can rotate around the first central shaft; the second gear hub is sleeved on the second central shaft and can rotate around the second central shaft.

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