A gearbox

Abstract

The present invention discloses a gearbox according to an embodiment of the present invention, comprising a case body, and further comprising: a case cover; which is installed above the case body, and the case cover is provided with an installation and disassembly opening; a shift fork assembly, which comprises a shift fork seat and a shift fork body, the shift fork seat is installed at the installation and disassembly opening, the shift fork seat is movably and detachably connected to the case body, the shift fork body is located directly below the installation and disassembly opening, the shift fork body is detachably connected to the shift fork seat, a shift fork block is provided on the shift fork body, and the shift fork block is connected to the shift gear to drive the shift gear to slide along the axis direction of the output shaft. Since the installation and disassembly opening is provided on the case cover, and the shift fork seat is installed at the installation and disassembly opening, when the shift fork needs to be replaced, there is no need to remove the case cover, and only the shift fork seat needs to be removed, the shift fork seat connected to the shift fork body needs to be taken out, and then the shift fork body needs to be removed from the shift fork seat for replacement, thereby reducing the time for replacing the gearbox shift fork.

Description

Technical Field

[0001] The invention relates to the field of transmission structures, and in particular to a gearbox. Background Art

[0002] The gearbox matches the speed and transmits torque between the prime mover and the working machine or actuator, and is widely used in modern machinery. In steel and non-ferrous metal rolling equipment, in order to better meet process requirements and improve the working capacity and economy of the prime mover, the gearbox is often designed as a variable speed ratio structure. The total speed ratio of the low gear is relatively large to meet the working requirements of extremely large torque and low speed, while the total speed ratio of the high gear is relatively small to meet the working requirements of low torque and extremely high speed.

[0003] In order to achieve the switching between low gear and high gear, a shifting device is needed. The usual practice is to use a cylinder to drive the rotating arm to rotate the transmission shaft, and the transmission shaft drives the shift fork mechanism to shift the inner spline sleeve to the outer spline sleeve of the double gear of different gears to achieve the gear switching. The shift fork drives the inner spline sleeve to move along the axial direction of the intermediate gear shaft by the swing of the shift fork device through the cylindrical or inner circle outer square shift fork block and the annular groove of the inner spline sleeve. When the gearbox is working, the shift fork block is always in contact with the annular groove of the inner spline sleeve. In the process that the inner spline sleeve always rotates at high speed with the shaft, there is sliding friction between the shift fork block and the annular groove of the inner spline sleeve. Long-term friction will cause the shift fork block to wear, resulting in inadequate gear switching and other equipment failures. Therefore, the shift fork block needs to be replaced irregularly according to the use and maintenance conditions. In order to remove the shift fork block, the existing gearbox often needs to remove the entire gearbox cover. Removing the cover requires unlocking many screws. During installation, the cover is heavy and it is more laborious to move and position, so it is inconvenient to disassemble and assemble. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a gearbox that can solve the problem of inconvenient replacement of a shift fork.

[0005] A gearbox according to an embodiment of the present invention comprises a housing, wherein a speed change mechanism is arranged in the housing, wherein the speed change mechanism comprises an input shaft, an output shaft, a shift gear and a plurality of speed change gear sets, wherein the transmission ratios of the plurality of speed change gear sets are different, wherein the plurality of speed change gear sets are all drivingly connected to the input shaft, wherein the speed change gear set is drivingly connected to the output shaft through the shift gear, wherein the shift gear slides along the axis direction of the output shaft so that the input shaft can be drivingly connected to the output shaft through different speed change gear sets, and wherein the gearbox further comprises:

[0006] A box cover is installed above the box body, and a mounting and disassembly opening is provided on the box cover;

[0007] A shift fork assembly comprises a shift fork seat and a shift fork body, wherein the shift fork seat is installed at the installation and disassembly opening, the shift fork seat is movably and detachably connected to the housing, the shift fork body is located directly below the installation and disassembly opening, the shift fork body is detachably connected to the shift fork seat, a shift fork block is provided on the shift fork body, and the shift fork block is connected to the shift gear to drive the shift gear to slide along the axial direction of the output shaft.

[0008] A gearbox according to an embodiment of the present invention has at least the following beneficial effects: since an installation and disassembly opening is provided on the case cover, and a shift fork seat is installed at the installation and disassembly opening, when the shift fork needs to be replaced, there is no need to remove the case cover, but only the shift fork seat needs to be removed, the shift fork seat connected to the shift fork body needs to be taken out, and then the shift fork body needs to be removed from the shift fork seat and replaced, thereby reducing the time for replacing the gearbox shift fork.

[0009] According to some embodiments of the present invention, the shift fork assembly further includes: a transmission mechanism, which includes a shift fork shaft and a transmission shaft, the shift fork shaft is fixedly connected to the shift fork body, the shift fork seat is provided with a first shaft seat, the first shaft seat is provided with a first shaft hole, the shift fork shaft is rotationally connected to the first shaft hole; the transmission shaft is rotationally connected to the second shaft hole; a driving device, which includes a driving seat and a driving shaft, the driving seat is connected to the housing, and the driving shaft is transmission-connected to the transmission shaft. The driving device drives the shift fork shaft to rotate through the driving shaft, and drives the shift gear along the axial direction of the output shaft through the shift fork block by mechanical drive, so that the output shaft is transmission-connected to different speed gear groups, avoiding manual shifting, which is safer.

[0010] According to some embodiments of the present invention, the fork shaft is detachably connected to the transmission shaft. Since the fork shaft is detachably connected to the transmission shaft, the fork shaft and the fork body are set to be smaller than the size of the installation and disassembly opening, so that when the fork seat and the box body are disassembled, the fork seat can be directly lifted to lift out the fork shaft together with the fork body, and the fork body and the fork block can be replaced, which is convenient.

[0011] According to some embodiments of the present invention, the fork seat includes a top cover and a connecting block, the top cover is detachably connected to the connecting block, the assembly and disassembly opening is provided on the connecting block, the first shaft seat is provided on the connecting block, the fork seat includes a top cover and a connecting block, the top cover is detachably connected to the connecting block, the assembly and disassembly opening is provided on the connecting block, the first shaft seat is provided on the connecting block, and the fork body is detachably connected to the fork shaft. If the fork body and the fork block need to be replaced, the top cover is removed to open the assembly and disassembly opening, the fork body is inserted into the box at the assembly and disassembly opening, and then taken out, so as to replace the fork block and the fork body. In this solution, since the disassembled components, the top cover and the fork body, are small and light in weight, the entire operation process does not require the use of an overhead crane, and the replacement process requires less production resources.

[0012] According to some embodiments of the present invention, the fork body includes a fork leg and two split bodies, the two split bodies are detachably connected by screws and hold the fork shaft tightly, and the fork leg is fixed to the split body located at the lower side and extends downward toward the shift gear. Thus, a specific structure is provided that can realize detachable connection between the fork body and the fork shaft, and the structure is simple, reliable and easy to implement. Furthermore, the axis of the screw passes through the assembly and disassembly opening, so that the fork body can be assembled and disassembled by screwing the screw with a straight screwdriver at the assembly and disassembly opening, and the assembly and disassembly of the fork body is more flexible and convenient.

[0013] According to some embodiments of the present invention, the shift fork shaft and the transmission shaft are integrally formed, the transmission shaft and the drive shaft are detachably connected, a protrusion is provided on the side wall of the box body, the drive device is arranged outside the box body, one end of the transmission shaft extends to the outside through the protrusion and is connected to the drive shaft. With this arrangement, after the shift fork body is removed from the shift fork shaft, the transmission shaft and the drive shaft are disassembled, and the transmission shaft and the shift fork shaft can be directly pulled out from the protrusion for maintenance, which makes the maintenance of the shift fork assembly and the transmission mechanism more convenient.

[0014] According to some embodiments of the present invention, the assembly and disassembly opening passes through the side wall and the top wall of the box body at the same time, the drive seat and the drive shaft are both located outside the box body, the transmission shaft extends outside the box body and is detachably connected to the drive shaft, and the fork seat closes the assembly and disassembly opening.

[0015] According to some embodiments of the present invention, the fork block is detachably connected to the fork body, so that when the fork block is worn, only the fork block needs to be replaced without replacing the fork body, which reduces maintenance costs.

[0016] According to some embodiments of the present invention, the driving device is a cylinder, the driving seat is a cylinder body, the driving shaft is a piston rod, the piston rod slides along the cylinder body, the cylinder body is hinged to the box body, and the transmission mechanism also includes a swivel arm, one end of the swivel arm is hinged to the piston rod, and the other end of the swivel arm is fixed to the transmission shaft. The above swivel arm is connected to the cylinder linkage to drive the fork body to move, and the hinge point of the cylinder body and the box body is preset at different positions or the stroke of the cylinder is changed to control the swing amplitude of the fork body driven by the fork shaft. Therefore, according to the actual swing amplitude required by the fork body, it can be achieved by changing the hinge point of the cylinder body and the box body or changing the stroke of the cylinder, and the implementation scheme is more flexible. In addition, a double gear is used in the embodiment of the present invention, which involves two gears of low speed and high speed. When three gears are needed, the use of a double cylinder combination can achieve the control of three gears.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 is a schematic top view of a gearbox according to an embodiment of the present invention;

[0020] Figure 2 It is a schematic diagram of the main structure of an embodiment of the present invention;

[0021] Figure 3 for Figure 2 Partial cross-sectional view of AA;

[0022] Figure 4 is a schematic diagram of the structure of the driving device;

[0023] Figure 5 It is a schematic diagram of the main structure of another embodiment of the present invention;

[0024] Figure 6 It is a schematic diagram of the main structure of another embodiment of the present invention.

[0025] A schematic top view of a gearbox according to an embodiment.

[0026] In the accompanying drawings: 100 - box;

[0027] 210-input shaft; 220-output shaft; 231-low-speed gear double gear; 232-low-speed gear input gear; 233-high-speed gear double gear; 234-high-speed gear input gear;

[0028] 300 - shift gear;

[0029] 400-box cover; 410-installation and disassembly opening;

[0030] 510-shift fork seat; 511-top cover; 512-connecting block; 520-shift fork body; 521-split; 530-shift fork block;

[0031] 610-shift fork shaft; 620-transmission shaft; 630-swing arm;

[0032] 710-driving seat; 720-driving shaft. DETAILED DESCRIPTION

[0033] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0034] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0035] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0036] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0037] The present embodiment provides a gearbox, including a housing 100, a speed change mechanism is arranged in the housing 100, the speed change mechanism includes an input shaft 210, an output shaft 220, a shift gear 300 and a plurality of speed change gear sets, one end of the input shaft 210 extends out of the housing 100, the output shaft 220 is provided with output teeth and meshes with the output gear, the transmission ratios of the plurality of speed change gear sets are different, the plurality of speed change gear sets are all transmission-connected with the input shaft 210, the speed change gear set is transmission-connected with the output shaft 220 through the shift gear 300, the shift gear 300 slides along the axial direction of the output shaft 220, so that the input shaft 210 can be transmission-connected with the output shaft 220 through different speed change gear sets, and a gearbox also includes:

[0038] The box cover 400 is installed above the box body 100, and a mounting and disassembly opening 410 is provided on the box cover 400;

[0039] The shift fork assembly includes a shift fork seat 510 and a shift fork body 520. The shift fork seat 510 is installed at the installation and disassembly opening 410. The shift fork seat 510 is movably and detachably connected to the housing 100. The shift fork body 520 is located directly below the installation and disassembly opening 410. The shift fork body 520 is detachably connected to the shift fork seat 510. A shift fork block 530 is provided on the shift fork body 520. The shift fork block 530 is connected to the shift gear 300 to drive the shift gear 300 to slide along the axial direction of the output shaft 220.

[0040] Since the assembly and disassembly opening 410 is opened on the case cover 400 and the fork seat 510 is installed at the assembly and disassembly opening 410, when the shift fork needs to be replaced, there is no need to remove the case cover 400. Instead, it is only necessary to remove the fork seat 510, take out the fork body connected to the fork seat 510, and then remove the fork body from the fork seat 510 for replacement, thereby reducing the time for replacing the gearbox fork.

[0041] Specifically, refer to Figure 1 The speed change mechanism includes two speed change gear sets, namely a low-speed gear set and a high-speed gear set. The low-speed gear set includes a low-speed input gear 232 fixedly connected to the input shaft 210 and a low-speed double gear 231 sleeved on the output shaft 220 and rotatably connected to the output shaft 220. The low-speed input gear 232 and the low-speed double gear 231 are meshed with each other. Similarly, the high-speed gear set includes a high-speed input gear 234 fixedly connected to the input shaft 210 and a high-speed double gear 233 sleeved on the output shaft 220 and rotatably connected to the output shaft 220. High speed and low speed refer to the relative relationship between the speeds, and do not specifically refer to a certain speed value or speed range.

[0042] A transmission gear is fixedly connected to the output shaft 220, and the shift gear 300 is sleeved outside the transmission gear and meshes with the transmission gear. The shift gear 300 slides along the output shaft 220, and a slide groove is provided on the outer periphery of the shift gear 300, and the slide groove passes through upward. When the shift gear 300 is fitted with the transmission gear and the low-speed gear double gear 231 at the same time, the output shaft 220 is in a low-speed gear operating state; when the shift gear 300 is fitted with the transmission gear and the high-speed gear double gear 233 at the same time, the output shaft 220 is in a high-speed gear operating state.

[0043] The fork body 520 is installed below the fork seat 510 , and the fork block 530 at the lower side of the fork body 520 extends into the slide groove and is slidably connected with the slide groove, driving the shift gear 300 to slide along the axial direction of the output shaft 220 .

[0044] Reference Figure 2 and Figure 3 and Figure 4 , the fork assembly also includes:

[0045] The transmission mechanism includes a fork shaft 610, a transmission shaft 620 and a swivel arm 630. The fork shaft 610 is fixedly connected to the fork body 520. A first shaft seat is provided at the lower side of the fork seat 510. A first shaft hole is provided on the first shaft seat. The fork shaft 610 is rotatably connected to the first shaft hole. The transmission shaft 620 is rotatably connected to the second shaft hole.

[0046] The driving device is an oil cylinder, which includes a driving seat 710 and a driving shaft 720. The driving seat 710 is a cylinder body, and the driving shaft 720 is a piston rod. The driving seat 710 is connected to the box body 100. The driving seat 710, the driving shaft 720 and the rotating arm 630 are all located outside the box body 100. One end of the rotating arm 630 is hinged to the piston rod, and the other end of the rotating arm 630 is fixedly connected to the transmission shaft 620, so that the driving shaft 720 is connected to the transmission shaft 620 in transmission connection.

[0047] Reference Figure 5 In other embodiments, the fork shaft 610 is detachably connected to the transmission shaft 620. The fork seat 510 includes a top cover 511 and a connecting block 512, the top cover 511 is detachably connected to the connecting block 512, the assembly and disassembly opening 410 is provided on the connecting block 512, the first shaft seat is provided on the connecting block 512, the fork seat 510 includes a top cover 511 and a connecting block 512, the top cover 511 is detachably connected to the connecting block 512, the assembly and disassembly opening 410 is provided on the connecting block 512, the first shaft seat is provided on the connecting block 512, and the fork body 520 is detachably connected to the fork shaft 610. The fork body 520 includes two split bodies 521, the two split bodies 521 are detachably connected by screws and hold the fork shaft 610 tightly. Thus, a specific structure capable of realizing detachable connection between the fork body 520 and the fork shaft 610 is provided, and the structure is simple, reliable and easy to implement. Furthermore, the axis of the screw passes through the mounting and disassembly opening 410 , so that the fork body 520 can be assembled and disassembled by using a straight screwdriver at the mounting and disassembly opening 410 , and the assembly and disassembly of the fork body 520 is more flexible and convenient.

[0048] The fork shaft 610 and the transmission shaft 620 are integrally formed, and the transmission shaft 620 and the drive shaft 720 are detachably hinged by a latch, a projection opening is provided on the side wall of the housing 100, and the driving device is provided outside the housing 100, and one end of the transmission shaft 620 extends to the outside through the projection opening and is in transmission connection with the drive shaft 720. According to this arrangement, after the fork body 520 is removed from the fork shaft 610, the transmission shaft 620 and the drive shaft 720 are disassembled, and the transmission shaft 620 and the fork shaft 610 can be directly withdrawn from the projection opening for maintenance, and the maintenance of the fork assembly and the transmission mechanism is relatively convenient.

[0049] Reference Figure 6 In other embodiments, the installation and disassembly opening 410 passes through the side wall and the top wall of the box body 100 at the same time, the transmission shaft 620 extends outside the box body 100 and is detachably connected to the driving shaft 720, and the fork seat 510 closes the installation and disassembly opening 410.

[0050] In any of the above embodiments, the fork block 530 is detachably connected to the fork body 520 by screws. Therefore, when the fork block 530 is worn, only the fork block 530 needs to be replaced, and the fork body 520 does not need to be replaced, which reduces maintenance costs.

[0051] The preferred embodiments of the present invention are specifically described above, but the present invention is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of the present invention.

Claims

1. A gearbox, comprising a housing, wherein a speed change mechanism is arranged in the housing, wherein the speed change mechanism comprises an input shaft, an output shaft, a shift gear and a plurality of speed change gear sets, wherein the transmission ratios of the plurality of speed change gear sets are different, wherein the plurality of speed change gear sets are all drivingly connected to the input shaft, wherein the speed change gear set is drivingly connected to the output shaft through the shift gear, wherein the shift gear slides along the axial direction of the output shaft so that the input shaft can be drivingly connected to the output shaft through different speed change gear sets, wherein the gear change gear slides along the axial direction of the output shaft, wherein ... Also includes: A box cover is installed above the box body, and a mounting and disassembly opening is provided on the box cover; A shift fork assembly, comprising a shift fork seat and a shift fork body, wherein the shift fork seat is mounted at the mounting and disassembly opening, the shift fork seat is movably and detachably connected to the housing, the shift fork body is located directly below the mounting and disassembly opening, the shift fork body is detachably connected to the shift fork seat, a shift fork block is provided on the shift fork body, the shift fork block is connected to the shift gear to drive the shift gear to slide along the axis direction of the output shaft; The fork assembly also includes: The transmission mechanism comprises a shift fork shaft and a transmission shaft, wherein the shift fork shaft is fixedly connected to the shift fork body, the shift fork seat is provided with a first shaft seat, the first shaft seat is provided with a first shaft hole, the shift fork shaft is rotatably connected to the first shaft hole; the transmission shaft is rotatably connected to the second shaft hole; A driving device, comprising a driving seat and a driving shaft, wherein the driving seat is connected to the housing, and the driving shaft is drivingly connected to the transmission shaft; The fork shaft is detachably connected to the transmission shaft, and the fork shaft and the fork body are configured to be smaller than the size of the installation and disassembly opening; The assembly and disassembly opening passes through the side wall and the top wall of the box body at the same time, the driving seat and the driving shaft are both located outside the box body, the transmission shaft extends outside the box body and is detachably connected to the driving shaft, and the fork seat closes the assembly and disassembly opening.

2. A gearbox according to claim 1, characterized in that: The fork seat comprises a top cover and a connecting block, the top cover is detachably connected to the connecting block, the assembly and disassembly opening is arranged on the connecting block, the first shaft seat is arranged on the connecting block, and the fork body is detachably connected to the fork shaft.

3. A gearbox according to claim 2, characterized in that: The shift fork body comprises a shift fork foot and two split bodies, the two split bodies are detachably connected by screws and hold the shift fork shaft tightly, and the shift fork foot is fixed on one of the split bodies and extends toward the shift gear.

4. A gearbox according to any one of claims 1 to 3, characterized in that: The fork block is detachably connected to the fork body.

5. A gearbox according to any one of claims 1 to 3, characterized in that: The driving device is a cylinder, the driving seat is a cylinder body, the driving shaft is a piston rod, the piston rod slides along the cylinder body, the cylinder body is hinged to the box body, and the transmission mechanism also includes a swivel arm, one end of the swivel arm is hinged to the piston rod, and the other end of the swivel arm is fixed to the transmission shaft.

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