High-reliability light-weight open mill gearbox

Abstract

The utility model relates to a high reliability light weight open mill gear box, the front side wall of a box body is distributed in a step shape, the step-shaped front side wall divides the box body into a first shell part and a second shell part which are different in width, the first shell part is narrower than the second shell part, a parallel final stage reduction gear pair is close to the rear side wall of the box body, and the second shell part is close to the rear side wall of the box body. A built-in bearing seat is arranged in the second shell part, the built-in bearing seat is arranged on the front side of the last-stage parallel-stage reduction gear pair, one end of the output countershaft is rotationally supported on the built-in bearing seat, and the other end of the output countershaft is rotationally supported on the front side wall of the second shell part. The step-shaped front side wall of the box body is combined with the built-in bearing seat, so that the box body is locally narrowed, the size of the box body is reduced, the axial sizes of the input shaft, the intermediate shafts and the output shaft are shortened, the boring deviation of the box body and the rigidity of the shafts are improved, the tooth-direction load distribution coefficient KHbeta is reduced, and the tooth surface contact strength of a gear pair is improved.

Description

Technical Field

[0001] This utility model relates to the field of gearbox technology, specifically to a highly reliable and lightweight open mill gearbox. Background Technology

[0002] With the development of the radial tire industry, the batch mixing volume of rubber has increased and the hardness of rubber compounds has increased. This has put forward requirements for larger and faster open mixing mills. The development of large-scale open mixing mills should be considered. Moreover, with the promotion of continuous automatic low-temperature rubber mixing technology for open mixing mills with energy saving as the main purpose, the demand for large open mixing mills will be further expanded.

[0003] Currently available open mill gearboxes such as Figure 1 The aforementioned design is primarily a single-input, dual-output type, with a structure consisting of a three-stage parallel shaft reduction and a single-stage parallel shaft distribution. The housing is a flat housing, and the input and output shafts are through shafts, which presents the following drawbacks:

[0004] 1. The container is too large, taking up too much factory space;

[0005] 2. Due to the wide width of the housing, the span between the input and output shafts is too long, resulting in poor shaft rigidity and affecting gear strength. Summary of the Invention

[0006] The purpose of this invention is to overcome the above-mentioned shortcomings and provide a highly reliable and lightweight open mill gearbox. By distributing the front sidewall of the gearbox in a stepped manner, the width of the gearbox on the input shaft side is shortened, thereby shortening the length of the input shaft; and by shortening the length of the output sub-shaft through the built-in bearing seat, the rigidity of the input shaft and the output shaft is improved.

[0007] The purpose of this utility model is achieved as follows:

[0008] A highly reliable and lightweight open mill gearbox includes a housing. An input shaft, a first intermediate shaft, a second intermediate shaft, an output main shaft, and an output secondary shaft are arranged parallel to each other inside the housing. One end of each of the input shaft, output main shaft, and output secondary shaft extends out of the front sidewall of the housing. The front sidewall of the housing is characterized by a stepped distribution, dividing the housing into a first housing section and a second housing section with different widths. The first housing section is narrower than the second housing section. The final stage reduction gear pair of the parallel stages is located near the rear sidewall of the housing. An internal bearing seat is provided within the second housing section, positioned in front of the final stage parallel stage reduction gear pair. One end of the output secondary shaft is rotatably supported on the internal bearing seat, and the other end is rotatably supported on the front sidewall of the second housing section.

[0009] Preferably, the input shaft, the first intermediate shaft, and the second intermediate shaft are disposed within the first housing portion, and the output main shaft and the output sub-shaft are disposed within the second housing portion.

[0010] Preferably, the output main shaft outputs 50% of the torque, and the output main shaft transmits 50% of the torque to the output secondary shaft through a distribution gear pair. The distribution gear pair is disposed inside the second housing part and close to the front sidewall of the second housing part.

[0011] The beneficial effects of this utility model are:

[0012] The stepped front sidewall divides the box into a first shell section and a second shell section with different widths 1.2, compressing the excess space in the box, making the structure more compact, reducing the volume of the box, thereby reducing the area of ​​the equipment installation platform and the factory floor space.

[0013] The stepped design on the front sidewall of the housing, combined with the built-in bearing seat, narrows the housing and shortens the axial dimensions of the input shaft, intermediate shafts, and output shaft. This improves the boring deviation of the housing and the rigidity of the shaft, reduces the tooth load distribution coefficient KHβ, and improves the tooth surface contact strength of the gear pair.

[0014] After optimizing the support position at the output sub-shaft, the arrangement space of the final stage reduction gear pair becomes more flexible, the speed ratio range that the model can meet is wider, and the model is more versatile. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the internal structure of a gearbox in an open mill, based on existing technology.

[0016] Figure 2 This is a schematic diagram of the internal structure of a highly reliable and lightweight open mill gearbox according to the present invention.

[0017] Figure 3 This is a schematic diagram of the external structure of this utility model.

[0018] Wherein: housing 1; first housing part 1.1; second housing part 1.2; input shaft 2; first intermediate shaft 3; second intermediate shaft 4; output main shaft 5; output secondary shaft 6; distribution gear pair 7; final stage reduction gear pair 8; built-in bearing seat 9. Implementation

[0019] See Figure 2 and Figure 3This utility model relates to a highly reliable and lightweight open mill gearbox, comprising a housing 1. Inside the housing 1, an input shaft 2, a first intermediate shaft 3, a second intermediate shaft 4, an output main shaft 5, and an output secondary shaft 6 are arranged in parallel. One end of the input shaft 2, the output main shaft 5, and the output secondary shaft 6 extends out of the front sidewall of the housing 1. The rear sidewall of the housing 1 is straight, and the front sidewall of the housing 1 is stepped. The stepped front sidewall divides the housing 1 into a first housing part 1.1 and a second housing part 1.2 with different widths, compressing excess space in the housing, making the structure more compact, reducing the volume of the housing, thereby reducing the installation platform area of ​​the equipment and the factory floor space.

[0020] The first housing portion 1.1 is narrower than the second housing portion 1.2. The input shaft 2, the first intermediate shaft 3 and the second intermediate shaft 4 are disposed in the first housing portion 1.1. The output main shaft 5 and the output secondary shaft 6 are disposed in the second housing portion 1.2. The first housing portion 1.1 and the second housing portion 1.2 are disposed on the left and right sides and are interconnected.

[0021] The output main shaft 5 outputs 50% of the torque, and the output main shaft 5 transmits 50% of the torque to the output secondary shaft 6 through the distribution gear pair 7. The distribution gear pair 7 is disposed inside the second housing part 1.2 and close to the front side wall of the second housing part 1.2.

[0022] The final stage reduction gear pair 8 of the parallel stage is located near the rear side wall of the housing 1. An internal bearing seat 9 is provided within the second housing portion 1.2, positioned in front of the final stage parallel stage reduction gear pair 8. One end of the output sub-shaft 6 is rotatably supported on the internal bearing seat 9, and the other end is rotatably supported on the front side wall of the second housing portion 1.2. The design of the internal bearing seat 9 shortens the axial dimension of the output sub-shaft, eliminates its support on the front and rear side walls of the housing, and avoids the final stage reduction gear pair 8, allowing for more flexible spatial arrangement of the final stage reduction gear pair and a wider range of speed ratios. Simultaneously, it improves the housing boring deviation and shaft rigidity, reduces the tooth load distribution coefficient KHβ, and enhances the tooth surface contact strength of the gear pair.

[0023] In addition to the above embodiments, this utility model also includes other implementation methods. All technical solutions formed by equivalent transformation or equivalent substitution should fall within the protection scope of the claims of this utility model.

Claims

1. A high-reliability lightweight open mill gear box, comprising a box, an input shaft, a first intermediate shaft, a second intermediate shaft, an output main shaft and an output auxiliary shaft are arranged in parallel in the box, one end of the input shaft, the output main shaft and the output auxiliary shaft extends out of the front side wall of the box, characterized in that: The front side wall of the box is in a stepped distribution, the stepped front side wall separates the box into first and second casing parts with different widths, the first casing part is narrower than the second casing part, the last-stage parallel-stage gear pair is close to the rear side wall of the box, the second casing part is provided with an inner bearing seat, the inner bearing seat is arranged at the front side of the last-stage parallel-stage gear pair, one end of the output secondary shaft is rotationally supported on the inner bearing seat, and the other end is rotationally supported on the front side wall of the second casing part.

2. A high-reliability lightweight roll mill gear box according to claim 1, characterized in that: The input shaft, the first intermediate shaft and the second intermediate shaft are arranged in the first casing part, and the output main shaft and the output secondary shaft are arranged in the second casing part.

3. A high-reliability lightweight roll mill gear box according to claim 1 or 2, characterized in that: The output main shaft outputs 50% of the torque, the output main shaft transmits 50% of the torque to the output secondary shaft through a distribution gear pair, the distribution gear pair is arranged in the second casing part and is close to the front side wall of the second casing part.

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