A multi-speed adjustable gear box

Abstract

The present invention provides a multi-speed adjustable gearbox, belonging to the technical field of gearboxes, comprising a first rotating shaft, a second rotating shaft, a first gear set, a second gear set, a third gear set and a switching mechanism, wherein the first rotating shaft and the second rotating shaft, one of them is used as an output shaft, and the other is used as an input shaft, wherein the first gear set, the second gear set and the third gear set, one of them is a fast gear set, the second of them is a slow gear set, and the third of them is a reverse gear set whose transmission ratio is inversely proportional to that of the first two, and the switching mechanism is used to enable the gearbox to have a fast state in which the first rotating shaft and the second rotating shaft are only driven by the fast gear set, a slow state in which they are only driven by the slow gear set, and a reverse state in which they are only driven by the reverse gear set; the present invention realizes fast and slow speed adjustment, and realizes switching between speed increase and speed decrease through the switching mechanism without re-adjusting the connection relationship between the output shaft, the input shaft, the driving source and the load end, thereby improving the application range of the gearbox.

Description

Technical Field

[0001] The invention relates to the technical field of gear boxes, and in particular to a multi-speed adjustable gear box. Background Art

[0002] A gearbox is a mechanical transmission device that is mainly used to change the speed and torque in a transmission system. It is widely used in various mechanical equipment, such as automobiles, industrial machinery, wind turbines, etc. The gearbox achieves transmission through a series of gears of different sizes and shapes that mesh with each other. Its core function is to transfer the input power to the output shaft as needed, while adjusting the output speed and torque. The design of the gearbox can be customized according to different application requirements, including spur gears, helical gears, bevel gears and other types to ensure efficient and stable transmission effects. In short, the gearbox plays a vital role in modern mechanical transmission systems and is an important component for achieving power transmission and regulation.

[0003] Conventional gearboxes usually have a gear system inside the housing, which includes a large gear and a small gear, which mesh with each other to achieve power transmission. The transmission mechanism of this gear set can effectively achieve speed acceleration or deceleration. However, the use of only a single gear set results in limited adaptability of the gearbox, which can usually only provide a fixed transmission ratio. Therefore, under some specific working conditions, the output speed and torque cannot be flexibly adjusted according to demand. In addition, when it is necessary to switch the acceleration and deceleration functions, the user can only replace the gearbox, or readjust the connection relationship between the output shaft, input shaft, drive source and load end of the gearbox, which not only involves disassembling multiple connecting parts, but also requires reassembly, which increases the time and cost of maintenance. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art and to provide a multi-speed adjustable gear box.

[0005] The technical solution adopted by the present invention is as follows: The present application provides a multi-speed adjustable gearbox, including a box body, wherein a first rotating shaft, a second rotating shaft, a first gear set, a second gear set, a third gear set and a switching mechanism are arranged in the box body, the first rotating shaft and the second rotating shaft, one of which is used as an output shaft and the other as an input shaft, the first gear set, the second gear set and the third gear set, one of which is a fast gear set, the second of which is a slow gear set, and the third of which is a reverse gear set with a transmission ratio inversely proportional to that of one of the first two, the first gear set, the second gear set and the third gear set are arranged in an axial direction of the first rotating shaft and an axial direction of the second rotating shaft, and the switching mechanism is used to enable the gearbox to have a fast state in which the first rotating shaft and the second rotating shaft are driven only by the fast gear set, a slow state in which the first rotating shaft and the second rotating shaft are driven only by the slow gear set, and a reverse state in which the first rotating shaft and the second rotating shaft are driven only by the reverse gear set;

[0006] Wherein, when the fast gear set and the slow gear set are used as a reduction gear set, the reverse gear set is an acceleration gear set; when the fast gear set and the slow gear set are used as an acceleration gear set, the reverse gear set is a reduction gear set.

[0007] In some embodiments, the first gear set is a fast gear set, which includes a first small gear and a first large gear, the second gear set is a slow gear set, which includes a second small gear and a second large gear, and the third gear set is a reverse gear set, which includes a third small gear and a third large gear;

[0008] When the first rotating shaft is an output shaft and the second rotating shaft is an input shaft, the first gear set and the second gear set are acceleration gear sets, and the third gear set is a reduction gear set;

[0009] Among them, the first small gear, the second small gear and the third large gear are arranged on the first rotating shaft, the first large gear, the second large gear and the third small gear are arranged on the second rotating shaft, and the transmission ratio of the first small gear to the first large gear is smaller than the transmission ratio of the second small gear to the second large gear.

[0010] In some embodiments, the switching mechanism includes a moving sleeve assembly and an adjusting assembly respectively disposed on the first rotating shaft and the second rotating shaft;

[0011] On the first rotating shaft, the movable sleeve assembly includes a first movable sleeve, a second movable sleeve and a third movable sleeve, the first movable sleeve, the second movable sleeve and the third movable sleeve are sequentially arranged along the axial direction of the first rotating shaft, the first pinion is connected to the first movable sleeve and moves synchronously, the second pinion is connected to the second movable sleeve and moves synchronously, the third large gear is connected to the third movable sleeve and moves synchronously, the inner walls of the first movable sleeve, the second movable sleeve and the third movable sleeve are respectively provided with a first connecting hole portion, a second connecting hole portion and a third connecting hole portion, and the first rotating shaft is respectively provided with a first connecting shaft portion, a second connecting shaft portion and a third connecting shaft portion corresponding to the first connecting hole portion, the second connecting hole portion and the third connecting hole portion;

[0012] When the gearbox is in a fast state, the first connection hole portion is matched with the first connection shaft portion, the second connection hole portion is misaligned with the second connection shaft portion, and the third connection hole portion is misaligned with the third connection shaft portion;

[0013] When the gearbox is in a slow state, the second connection hole portion is matched with the second connection shaft portion, the first connection hole portion is misaligned with the first connection shaft portion, and the third connection hole portion is misaligned with the third connection shaft portion;

[0014] When the gearbox is in a reverse speed state, the third connection hole portion is matched with the third connection shaft portion, the first connection hole portion is misaligned with the first connection shaft portion, and the second connection hole portion is misaligned with the second connection shaft portion;

[0015] The structure of the movable sleeve assembly on the second rotating shaft is the same as above.

[0016] In some embodiments, the adjustment assembly includes four adjustment seats, two fixed plates, a first push plate, a second push plate, a first spring and an adjustment shaft. The four adjustment seats are respectively arranged at both ends of the first rotating shaft and the second rotating shaft. The two fixed plates are arranged in the box at intervals. The adjustment seat includes a disc body connected to the fixed plate and a main body. The center of the main body is provided with a through hole along its axial direction for the corresponding rotating shaft to pass through. The main body is provided with a channel for the corresponding movable sleeve to slide on one end facing the fixed plate. The main body is provided with a push groove along its axial direction. The first push plate Both ends of the second push plate are provided with openings adapted to the main body, and a push convex block adapted to the push groove is protruded in the opening, and the push convex block is abutted against the end of the corresponding movable sleeve, one end of the adjusting shaft is rotatably arranged on a fixed plate close to one side of the first gear set, and the other end is provided with an operating port, and a screw slider matching structure is provided between the middle part and the first push plate, and the first spring is provided between the second push plate and the inner wall of the box body, and under the action of the first spring, the second push plate, the third movable sleeve, the second movable sleeve, the first movable sleeve and the first push plate are abutted in sequence;

[0017] When the adjusting shaft rotates, the first pushing plate moves along the channel direction, so that the first moving sleeve of the first rotating shaft moves synchronously with the first moving sleeve on the second rotating shaft.

[0018] In some embodiments, a spring positioning column is provided on the second push plate, a fixing cylinder is provided on the box body coaxially with the first spring, an adjusting bolt is connected to the inner thread of the fixing cylinder, a spring pushing disk is provided at the end of the adjusting bolt, and a spring positioning groove is provided on the spring pushing disk for the first spring to be embedded.

[0019] In some embodiments, two slide seats are provided on the fixed plate near the third gear set, and the two slide seats are located on both sides of the second push plate. A sliding block is slidably provided in the slide seat, and a gear slide is provided on the side of the sliding block facing the second push plate, and three gear slots are provided on the gear slide along the moving direction of the second push plate, and the three gear slots respectively correspond to the corresponding positions to which the second push plate moves in the fast state, the slow state and the reverse state, and sliding parts are provided on both sides of the second push plate corresponding to the gear slots, and the sliding part includes two sliding inclined surfaces, and the two sliding inclined surfaces are close to each other on the side close to the gear slot, and a second spring is provided between the side of the sliding block away from the second push plate and the slide seat, and under the action of the second spring, the sliding part abuts against the gear slide.

[0020] In some embodiments, the cross-section of the shift slot and the cross-section of the sliding portion are matched trapezoids.

[0021] In some embodiments, a limiting protrusion is provided on one end of the gear slideway away from the fixed plate, and the limiting protrusion is located on the moving path of the sliding part.

[0022] In some embodiments, a rotating connection assembly is provided between the first push plate and the first movable sleeve, between the first movable sleeve and the second movable sleeve, between the second movable sleeve and the third movable sleeve, and between the third movable sleeve and the second push plate. The rotating connection assembly includes two connecting rings and a plurality of balls uniformly arranged circumferentially between the two connecting rings.

[0023] In some embodiments, the lower end of the second push plate is connected to a first rack arranged along the axial direction of the first rotating shaft, the inner bottom wall of the box body is provided with a rack slide and a gear seat, the second gear is slidably provided on the rack slide, and a fourth large gear and a fourth small gear are rotatably provided on the gear seat, the fourth small gear is meshed with the first rack, the fourth large gear is meshed with the second rack, the fourth large gear and the fourth small gear rotate synchronously, one end of the second rack extends out of the box body and is provided with a gear indicator needle, and the box body is provided with a gear scale corresponding to the gear indicator needle.

[0024] The beneficial effects of the present invention are as follows: the present invention can not only realize fast and slow speed adjustment, but also can realize the switching of speed increase and speed decrease through the switching mechanism without readjusting the connection relationship between the output shaft, input shaft, drive source and load end of the gear box, thereby greatly improving the application range and convenience of use of the gear box. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, without paying creative labor, other drawings obtained based on these drawings still belong to the scope of the present invention.

[0026] Figure 1 A schematic diagram of a multi-speed adjustable gearbox in the present invention Figure 1 ;

[0027] Figure 2 A schematic diagram of a multi-speed adjustable gearbox in the present invention Figure 2 ;

[0028] Figure 3 A cross-sectional view of a multi-speed adjustable gearbox in the present invention Figure 1 ;

[0029] Figure 4 A cross-sectional view of a multi-speed adjustable gearbox in the present invention Figure 2 ;

[0030] Figure 5 It is a schematic diagram of the adjustment seat in the present invention;

[0031] Figure 6 is a schematic diagram of the second push plate in the present invention;

[0032] Figure 7 A partial schematic diagram of a multi-speed adjustable gearbox in the present invention Figure 1 ;

[0033] Figure 8 A partial schematic diagram of a multi-speed adjustable gearbox in the present invention Figure 2 ;

[0034] Fig. 9 A partial schematic diagram of a multi-speed adjustable gearbox in the present invention Figure 3 . DETAILED DESCRIPTION

[0035] The following description provides specific application scenarios and requirements of this specification, with the purpose of enabling those skilled in the art to make and use the contents of this specification. Various local modifications to the disclosed embodiments will be apparent to those skilled in the art, and the general principles defined herein may be applied to other embodiments and applications without departing from the spirit and scope of this specification. Therefore, this specification is not limited to the embodiments shown, but to the widest scope consistent with the claims.

[0036] In the description of the present application, it should be noted that, unless otherwise expressly specified and limited, the terms "longitudinal", "transverse", "radial", "length", "width", "thickness", "up", "down", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. These terms are mainly for better describing the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0037] Secondly, the terms "first", "second" and similar words do not indicate any order, quantity or importance, but are only used to distinguish different components and should not be understood as limitations on the embodiments of the present application.

[0038] In addition, the terms "installed", "set", "provided with", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements or components.

[0039] For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0040] Regarding the drawings of the present application, it should be clearly understood that the drawings are for illustration and description purposes only and are not intended to limit the scope of the present specification. It should also be understood that the drawings are not drawn to scale.

[0041] Embodiment 1:

[0042] like Figures 1 to 9 As shown, the present embodiment provides a multi-speed adjustable gearbox, including a housing 1, the housing 1 is formed by the left housing and the right housing and has an installation cavity therein, the installation cavity is provided with a first rotating shaft 2, a second rotating shaft 3, a first gear set 4, a second gear set 5, a third gear set 6 and a switching mechanism 7, the first rotating shaft 2 and the second rotating shaft 3, one of which is an output shaft and the other is an input shaft, the output shaft is connected to the load end, and the input shaft is connected to the driving source, the first gear set 4, the second gear set 5 and the third gear set 6, one of which is a fast gear set, the second is a slow gear set, and the third is a reverse gear set inversely proportional to the transmission ratio of one of the first two, specifically, the transmission ratio of the fast gear set is set to N, the transmission ratio of the slow gear set is set to n, and the transmission ratio of the reverse gear set is set to 1 / N or 1 / n, that is, if the fast gear set and the slow gear set are speed-increasing gear sets, the reverse gear set is a speed-reducing gear set, and if the fast gear set and the slow gear set are speed-reducing gear sets, the reverse gear set is a speed-increasing gear set.

[0043] Secondly, the first gear set 4, the second gear set 5 and the third gear set 6 are arranged at intervals along the axial direction of the first rotating shaft 2 and the axial direction of the second rotating shaft 3, and the switching mechanism 7 is used to enable the gear box to have a fast state in which the first rotating shaft 2 and the second rotating shaft 3 are only driven by the fast gear set, a slow state in which the first rotating shaft 2 and the second rotating shaft 3 are only driven by the slow gear set, and a reverse speed state in which the first rotating shaft 2 and the second rotating shaft 3 are only driven by the reverse speed gear set; in this way, not only the fast and slow speed adjustment can be achieved, but also the switching between speed increase and speed decrease can be achieved through the switching mechanism 7 without readjusting the connection relationship between the output shaft, the input shaft, the driving source and the load end of the gear box, which greatly improves the application range and convenience of use of the gear box.

[0044] In the disclosed embodiment, the first rotating shaft 2 is set as the output shaft and the second rotating shaft 3 is set as the input shaft. At the same time, the first gear group 4 and the second gear group 5 are set as the acceleration gear group, and the third gear group 6 is the reduction gear group. In addition, the first gear group 4 is a fast gear group, which includes a first small gear 41 and a first large gear 42, the second gear group 5 is a slow gear group, which includes a second small gear 51 and a second large gear 52, and the third gear group 6 is a reverse gear group, which includes a third small gear 61 and a third large gear 62, wherein the first small gear 41, the second small gear 51 and the third large gear 62 are arranged on the first rotating shaft 2, the first large gear 42, the second large gear 52 and the third small gear 61 are arranged on the second rotating shaft 3, and the transmission ratio of the first small gear 41 to the first large gear 42 is smaller than the transmission ratio of the second small gear 51 to the second large gear 52.

[0045] In the embodiment of the present disclosure, a switching mechanism 7 is proposed, and the switching mechanism 7 includes a movable sleeve assembly and an adjustment assembly respectively arranged on the first rotating shaft 2 and the second rotating shaft 3. The first rotating shaft 2 and the second rotating shaft 3 are provided with the same movable sleeve assembly. Therefore, the movable sleeve assembly on the first rotating shaft 2 is taken as an example: on the first rotating shaft 2, the movable sleeve assembly includes a first movable sleeve 71, a second movable sleeve 72 and a third movable sleeve 73, and the first movable sleeve 71, the second movable sleeve 72 and the third movable sleeve 73 are sequentially arranged along the axial direction of the first rotating shaft 2, the first pinion 41 is connected to the first movable sleeve 71 and moves synchronously, the second pinion 51 is connected to the second movable sleeve 72 and moves synchronously, and the third large gear 62 is connected to the third movable sleeve 73 and moves synchronously. Specifically, taking the first pinion 41 and the first movable sleeve 71 as an example, the two can be integrated or connected and fixed, and the synchronous action represents the synchronous rotation and synchronous movement of the two.

[0046] Secondly, the inner walls of the first movable sleeve 71, the second movable sleeve 72 and the third movable sleeve 73 are respectively provided with a first connecting hole portion 710, a second connecting hole portion 720 and a third connecting hole portion 730, and the first rotating shaft 2 is respectively provided with a first connecting shaft portion 21, a second connecting shaft portion 22 and a third connecting shaft portion 23 corresponding to the first connecting hole portion 710, the second connecting hole portion 720 and the third connecting hole portion 730. Preferably, each connecting hole portion has the same structure, and each connecting shaft portion has the same structure. At the same time, the connecting hole portion is a polygonal inner hole, for example, a square hole, a hexagonal hole, etc., and can also be a straight hole, a cross hole, etc., and the connecting shaft portion is adapted to the connecting hole portion.

[0047] Based on this, when the gear box is in a fast state, the first connecting hole portion 710 cooperates with the first connecting shaft portion 21, the second connecting hole portion 720 is offset with the second connecting shaft portion 22, and the third connecting hole portion 730 is offset with the third connecting shaft portion 23; when the gear box is in a slow state, the second connecting hole portion 720 cooperates with the second connecting shaft portion 22, the first connecting hole portion 710 is offset with the first connecting shaft portion 21, and the third connecting hole portion 730 is offset with the third connecting shaft portion 23; when the gear box is in a reverse state, the third connecting hole portion 730 cooperates with the third connecting shaft portion 23, the first connecting hole portion 710 is offset with the first connecting shaft portion 21, and the second connecting hole portion 720 is offset with the second connecting shaft portion 22.

[0048] On the contrary, if other situations are set, for example, the first gear set 4 and the second gear set 5 are set as a reduction gear set, and the third gear set 6 is set as a speed increase gear set, etc., those skilled in the art should be able to implement it based on the above examples.

[0049] In the embodiment of the present disclosure, the adjustment assembly includes four adjustment seats 74, two fixed plates 75, a first push plate 76, a second push plate 77, a first spring 78 and an adjustment shaft 79. The four adjustment seats 74 are respectively arranged at both ends of the first rotating shaft 2 and the second rotating shaft 3. The two fixed plates 75 are arranged at intervals in the box body 1. The fixed plates 75 are connected and fixed to the inner wall of the box body 1. The adjustment seat 74 includes a disc body portion 740 connected to the fixed plate 75 and a main body portion 741. The center of the main body portion 741 is provided with a through hole 742 for the corresponding rotating shaft to pass through along its axial direction. The main body portion 741 has a through hole 742 for the corresponding rotating shaft to pass through, and one end of the main body portion 741 toward the fixed plate 75 is provided with a through hole 742 for the corresponding moving shaft to pass through. The sleeve slides on the channel 743, and a push groove 744 is provided on the main body 741 along its axial direction. Both ends of the first push plate 76 and the second push plate 77 are provided with openings 760 adapted to the main body 741. A push protrusion 761 adapted to the push groove 744 is protruded in the opening 760, and the push protrusion 761 is abutted against the end of the corresponding movable sleeve. Preferably, two push grooves 744 are provided on the main body 741 and are distributed in a straight line. Similarly, two push protrusions 761 are protruded in the opening 760 and are also distributed in a straight line. In this way, when the first push plate 76 and the second push plate 77 push the corresponding movable sleeve, the movement of the corresponding movable sleeve is more stable.

[0050] Secondly, one end of the adjusting shaft 79 is rotatably set on the fixed plate 75 close to the side of the first gear set 4, and the other end is provided with an operating port 790, into which a suitable operating handle can be inserted to rotate the adjusting shaft 79, and a screw slider matching structure is provided between the middle part of the adjusting shaft 79 and the first push plate 76. Specifically, a screw part is provided on the adjusting shaft 79, and a slider matched with the screw part is provided on the first push plate 76. In this way, when the adjusting shaft 79 rotates, the first push plate 76 will move along the direction of the channel 743, so that the first movable sleeve 71 on the first rotating shaft 2 and the second rotating shaft 3 move synchronously.

[0051] In addition, the first spring 78 is arranged between the second push plate 77 and the inner wall of the box body 1. Under the action of the first spring 78, the second push plate 77, the third movable sleeve 73, the second movable sleeve 72, the first movable sleeve 71 and the first push plate 76 are abutted in sequence, thereby ensuring that each movable sleeve will not move arbitrarily on the corresponding rotating shaft.

[0052] Optionally, a spring positioning column 770 is provided on the second push plate 77, and a fixing cylinder 771 is provided on the box body 1 coaxially with the first spring 78. The fixing cylinder 771 is internally threadedly connected with an adjusting bolt 772, and a spring pushing disk 773 is provided at the end of the adjusting bolt 772. The spring pushing disk 773 is provided with a spring positioning groove 774 for the first spring 78 to be embedded, which not only positions the first spring 78 but also adjusts the preload force of the first spring 78 to cope with the processing errors of parts and the elastic fatigue of the first spring 78.

[0053] Optionally, two slide seats 80 are provided on the fixed plate 75 close to the third gear set 6, and the two slide seats 80 are located on both sides of the second push plate 77. A sliding block 81 is slidably provided in the slide seat 80. The slide seat 80 is U-shaped, and sliding oblong holes 800 are opened on both sides thereof. Sliding protrusions 810 are correspondingly provided on both sides of the sliding block 81, and the sliding protrusions 810 extend into the sliding oblong holes 800. A gear slideway 82 is provided on the side of the sliding block 81 facing the second push plate 77, and three gear slots 820 are provided on the gear slideway 82 along the moving direction of the second push plate 77. The three gear slots 820 respectively correspond to the second push plate 77 in the fast state, the slow state and the reverse state. The movable plate 77 moves to the corresponding position. Specifically, the first gear slot 8201, the second gear slot 8202 and the third gear slot 8203 are arranged in sequence along the moving direction of the second push plate 77. The first gear slot 8201 corresponds to the fast state, the second gear slot 8202 corresponds to the slow state, and the third gear slot 8203 corresponds to the reverse state. The two sides of the second push plate 77 are provided with sliding parts 7700 corresponding to the gear slot 820. The sliding parts 7700 include two sliding inclined surfaces. The two sliding inclined surfaces are close to the side of the gear slot 820. Preferably, the cross section of the gear slot 820 and the cross section of the sliding part 7700 are adapted trapezoids. Secondly, a second spring 83 is arranged between the side of the sliding block 81 away from the second push plate 77 and the slide seat 80. Under the action of the second spring 83, the sliding part 7700 abuts against the gear slide 82.

[0054] Through the above arrangement, there is an obvious gear position feeling when using the adjustment shaft 79 for adjustment, and at the same time, when the gear box is in various states, the transmission of the corresponding gear set is more stable and reliable.

[0055] Optionally, a limiting protrusion 8200 is provided on one end of the gear slide 82 away from the fixed plate 75, and the limiting protrusion 8200 is located on the moving path of the sliding part 7700, thereby effectively limiting the moving range of the second push plate 77 and avoiding excessive adjustment of the adjustment shaft 79.

[0056] In the disclosed embodiment, a rotating connection assembly is provided between the first push plate 76 and the first movable sleeve 71, between the first movable sleeve 71 and the second movable sleeve 72, between the second movable sleeve 72 and the third movable sleeve 73, and between the third movable sleeve 73 and the second push plate 77. The rotating connection assembly includes two connecting rings and a plurality of balls uniformly arranged circumferentially between the two connecting rings. The two connecting rings are respectively connected or plugged with two abutting parts, and the rotating connection is achieved through the balls, thereby reducing the friction resistance and friction loss between the gear set and the abutting parts during rotation, ensuring that when a gear set is working, it will not drive the abutting gear set to rotate, and also extending the service life of the gear box. It should be understood that the rotating connection assembly can also adopt the rotating connection parts in the prior art, such as bearings.

[0057] In the disclosed embodiment, the lower end of the second push plate 77 is connected to a first rack 91 arranged along the axial direction of the first rotating shaft 2, and the inner bottom wall of the box body 1 is provided with a rack slide 92 and a gear seat 93, a second rack 94 is slidably provided on the rack slide 92, and a fourth large gear 95 and a fourth small gear 96 are rotatably provided on the gear seat 93, the fourth small gear 96 is meshed with the first rack 91, the fourth large gear 95 is meshed with the second rack 94, and the fourth large gear 95 and the fourth small gear 96 rotate synchronously. When the second push plate 77 moves forward, it drives the first rack 91 to move forward, through The fourth small gear 96 and the fourth large gear 95 drive the second rack 94 to move backward. One end of the second rack extends out of the box body 1 and is provided with a gear indicator needle 97. The box body 1 is provided with a gear scale 98 corresponding to the gear indicator needle 97. The gear scale 98 has three gear scales, which correspond to the three states of the gear box. Through the above arrangement, the user can read from the outside of the box body 1 which set of gears is used for transmission inside the box body 1. At the same time, the structure of the first rack 91, the fourth large gear 95, the fourth small gear 96 and the second rack can reduce the displacement of the gear indicator needle 97, thereby reducing the space occupied by the entire gear box in this direction.

[0058] In the disclosed embodiment, lubricating liquid is provided in the housing 1 to ensure smooth operation of the gear sets, rotating connection components, etc.

[0059] In summary, after reading this detailed disclosure, those skilled in the art will appreciate that the foregoing detailed disclosure may be presented only by way of example and may not be restrictive. Although not explicitly stated herein, those skilled in the art will appreciate that the requirements of this application encompass various reasonable changes, improvements and modifications to the embodiments. These changes, improvements and modifications are intended to be proposed by the present application and are within the spirit and scope of the exemplary embodiments of the present application.

[0060] In addition, it should be understood that in the foregoing description of the embodiments of the present application, in order to help understand a feature and for the purpose of simplifying the present application, the present application combines various features in a single embodiment, drawing or its description. However, this does not mean that the combination of these features is necessary. When reading the present application, it is entirely possible for a person skilled in the art to mark out a part of the devices as a separate embodiment. In other words, the embodiments in the present application can also be understood as the integration of multiple secondary embodiments. This is also true when the content of each secondary embodiment is less than all the features of a single aforementioned disclosed embodiment.

[0061] Finally, it should be understood that the embodiments of the application disclosed herein are explanations of the principles of the embodiments of the present application. Other modified embodiments are also within the scope of the present application. Therefore, the embodiments disclosed in the present application are merely examples and not limitations. Those skilled in the art can adopt alternative configurations according to the embodiments in the present application to implement the application in the present application. Therefore, the embodiments of the present application are not limited to the embodiments accurately described in the application.

Claims

1. A multi-speed adjustable gearbox, comprising a housing, characterized in that: The housing is provided with a first rotating shaft, a second rotating shaft, a first gear set, a second gear set, a third gear set and a switching mechanism, wherein the first rotating shaft and the second rotating shaft, one of them is used as an output shaft and the other as an input shaft, wherein the first gear set, the second gear set and the third gear set, one of them is a fast gear set, the second of them is a slow gear set, and the third of them is a reverse gear set having a transmission ratio inversely proportional to that of one of the first two, the first gear set, the second gear set and the third gear set are arranged at intervals along the axial direction of the first rotating shaft and the axial direction of the second rotating shaft, and the switching mechanism is used to enable the gear box to have a fast state in which the first rotating shaft and the second rotating shaft are driven only by the fast gear set, a slow state in which the first rotating shaft and the second rotating shaft are driven only by the slow gear set, and a reverse state in which the first rotating shaft and the second rotating shaft are driven only by the reverse gear set; Wherein, when the fast gear set and the slow gear set are used as a reduction gear set, the reverse gear set is an acceleration gear set; when the fast gear set and the slow gear set are used as an acceleration gear set, the reverse gear set is a reduction gear set; The first gear set is a fast gear set, which includes a first small gear and a first large gear; the second gear set is a slow gear set, which includes a second small gear and a second large gear; the third gear set is a reverse gear set, which includes a third small gear and a third large gear; When the first rotating shaft is an output shaft and the second rotating shaft is an input shaft, the first gear set and the second gear set are acceleration gear sets, and the third gear set is a reduction gear set; The first small gear, the second small gear and the third large gear are arranged on the first rotating shaft, the first large gear, the second large gear and the third small gear are arranged on the second rotating shaft, and the transmission ratio of the first small gear to the first large gear is smaller than the transmission ratio of the second small gear to the second large gear; The switching mechanism comprises a moving sleeve assembly and an adjusting assembly respectively arranged on the first rotating shaft and the second rotating shaft; On the first rotating shaft, the movable sleeve assembly includes a first movable sleeve, a second movable sleeve and a third movable sleeve, the first movable sleeve, the second movable sleeve and the third movable sleeve are sequentially arranged along the axial direction of the first rotating shaft, the first pinion is connected to the first movable sleeve and moves synchronously, the second pinion is connected to the second movable sleeve and moves synchronously, the third large gear is connected to the third movable sleeve and moves synchronously, the inner walls of the first movable sleeve, the second movable sleeve and the third movable sleeve are respectively provided with a first connecting hole portion, a second connecting hole portion and a third connecting hole portion, and the first rotating shaft is respectively provided with a first connecting shaft portion, a second connecting shaft portion and a third connecting shaft portion corresponding to the first connecting hole portion, the second connecting hole portion and the third connecting hole portion; When the gearbox is in a fast state, the first connection hole portion is matched with the first connection shaft portion, the second connection hole portion is misaligned with the second connection shaft portion, and the third connection hole portion is misaligned with the third connection shaft portion; When the gearbox is in a slow state, the second connection hole portion is matched with the second connection shaft portion, the first connection hole portion is misaligned with the first connection shaft portion, and the third connection hole portion is misaligned with the third connection shaft portion; When the gearbox is in a reverse speed state, the third connection hole portion is matched with the third connection shaft portion, the first connection hole portion is misaligned with the first connection shaft portion, and the second connection hole portion is misaligned with the second connection shaft portion; The structure of the movable sleeve assembly on the second rotating shaft is the same as the structure of the movable sleeve assembly on the first rotating shaft; The adjusting assembly includes four adjusting seats, two fixed plates, a first pushing plate, a second pushing plate, a first spring and an adjusting shaft, the four adjusting seats are respectively arranged at both ends of the first rotating shaft and the second rotating shaft, the two fixed plates are arranged in the box at intervals, the adjusting seat includes a disc body portion connected to the fixed plate and a main body portion, the center of the main body portion is provided with a through hole for the corresponding rotating shaft to pass through along its axial direction, the main body portion is provided with a channel for the corresponding moving sleeve to slide towards one end of the fixed plate, the main body portion is provided with a pushing groove along its axial direction, the first pushing plate and the second pushing plate are connected to each other Both ends of the movable plate are provided with openings adapted to the main body, and a pushing protrusion adapted to the pushing groove is protruded in the opening, and the pushing protrusion is abutted against the end of the corresponding movable sleeve, one end of the adjusting shaft is rotatably arranged on the fixed plate close to the first gear set, and the other end is provided with an operating port, and a screw slider matching structure is provided between the middle part and the first pushing plate, and the first spring is provided between the second pushing plate and the inner wall of the box body, and under the action of the first spring, the second pushing plate, the third moving sleeve, the second moving sleeve, the first moving sleeve and the first pushing plate are abutted in sequence; When the adjusting shaft rotates, the first pushing plate moves along the channel direction, so that the first moving sleeve of the first rotating shaft moves synchronously with the first moving sleeve on the second rotating shaft.

2. A multi-speed adjustable gearbox according to claim 1, characterized in that: A spring positioning column is arranged on the second push plate, a fixing cylinder is arranged on the box body coaxially with the first spring, an adjusting bolt is connected with the inner thread of the fixing cylinder, a spring pushing disk is arranged at the end of the adjusting bolt, and a spring positioning groove is arranged on the spring pushing disk for the first spring to be embedded.

3. A multi-speed adjustable gearbox according to claim 1, characterized in that: Two slide seats are arranged on the fixed plate near the third gear set, and the two slide seats are located on both sides of the second push plate. A sliding block is slidably arranged in the slide seat, and a gear slide is arranged on the side of the sliding block facing the second push plate, and three gear slots are arranged on the gear slide along the moving direction of the second push plate, and the three gear slots respectively correspond to the corresponding positions to which the second push plate moves in the fast state, the slow state and the reverse state, and sliding parts are arranged on both sides of the second push plate corresponding to the gear slots, and the sliding part includes two sliding inclined surfaces, and the two sliding inclined surfaces are close to each other on the side of the gear slot, and a second spring is arranged between the side of the sliding block away from the second push plate and the slide seat, and under the action of the second spring, the sliding part abuts against the gear slide.

4. A multi-speed adjustable gearbox according to claim 3, characterized in that: The cross section of the shift groove and the cross section of the sliding portion are matched trapezoids.

5. A multi-speed adjustable gearbox according to claim 3, characterized in that: A limiting protrusion is arranged on one end of the gear slideway away from the fixing plate, and the limiting protrusion is located on the moving path of the sliding part.

6. A multi-speed adjustable gearbox according to claim 1, characterized in that: A rotating connection component is provided between the first push plate and the first movable sleeve, between the first movable sleeve and the second movable sleeve, between the second movable sleeve and the third movable sleeve, and between the third movable sleeve and the second push plate. The rotating connection component includes two connecting rings and a plurality of balls uniformly arranged circumferentially between the two connecting rings.

7. A multi-speed adjustable gearbox according to claim 1, characterized in that: The lower end of the second push plate is connected to the first rack arranged along the axial direction of the first rotating shaft, the inner bottom wall of the box body is provided with a rack slide and a gear seat, the second gear is slidably provided on the rack slide, and a fourth large gear and a fourth small gear are rotatably provided on the gear seat, the fourth small gear is meshed with the first rack, the fourth large gear is meshed with the second rack, the fourth large gear and the fourth small gear rotate synchronously, one end of the second rack extends out of the box body and is provided with a gear indicator needle, and the box body is provided with a gear scale corresponding to the gear indicator needle.

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