Height-increasing type tractor gearbox cover assembly

Abstract

The utility model discloses a heightening type tractor gearbox cover assembly, which relates to the technical field of gearboxes, and comprises a cover body, a gear shifting shaft is arranged in the cover body, the gear shifting shaft comprises a gear shifting input end and a gear shifting output end, a gear shifting heightening cylinder positioned above the gear shifting input end is fixedly arranged on the cover body, and the gear shifting heightening cylinder is fixedly arranged on the cover body. A gear shifting rod is mounted at the upper end of the gear shifting heightening cylinder in a swinging manner; a gear shifting input rod arranged upwards is fixedly arranged at the gear shifting input end, and the lower end of the gear shifting rod is used for shifting the gear shifting input rod. The gear shifting heightening cylinder is additionally installed on the cover body, the gear shifting rod is installed at the upper end of the gear shifting heightening cylinder, the gear shifting input rod can be arranged upwards on the gear shifting shaft to transmit the gear shifting operation effect, the occupied space below the gearbox cover is reduced, and the size of a gearbox is reduced. The upward gear shifting input rod and the heightened gear shifting rod achieve reduction of the length ratio of the upper rod to the lower rod of the gear shifting rod, and the gear shifting control range can be easily reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to gearbox technical field especially relates to a heightening formula tractor gearbox cover assembly. BACKGROUND

[0002] Gearbox is important power component on tractor, and its shift lever and shift shaft structure are integrated on gearbox cover. After gearbox cover assembly is installed on gearbox body, shift lever is in driver's cabin, and its upper end handle is at the height that driver's hand can reach. In existing gearbox cover assembly, crank arm is arranged for end part of shift shaft, shift lever is swingly installed on gearbox cover, and its lower end drives shift shaft to rotate (gear engagement) or axially moves (gear selection) through the crank arm, thereby realizing gear shifting operation. The crank arm occupies certain space below gearbox cover. With the development trend of tractor height integration, higher requirements are put forward for the volume of gearbox in tractor, and the above-mentioned space occupation below gearbox cover is not conducive to reducing the volume of gearbox. In addition, the lower half of shift lever is approximately connected with crank arm after shift shaft, and the length between upper and lower lever bodies of shift lever is relatively large, so that the handle has a large operating range during gear shifting, and the driver's cabin of height integrated tractor does not have enough space to meet the above-mentioned operation requirements. Therefore, the gearbox cover assembly needs to be improved according to the above-mentioned conditions. Figure 3 TECHNICAL PROBLEM The utility model provides a heightening formula tractor gearbox cover assembly, which reduces the space occupied below the gearbox cover, is conducive to reducing the volume of the gearbox, and is conducive to reducing the gear shifting operating range. ADVANTAGEOUS EFFECTS

[0003] The utility model provides a heightening formula tractor gearbox cover assembly, which reduces the space occupied below the gearbox cover, is conducive to reducing the volume of the gearbox, and is conducive to reducing the gear shifting operating range.

[0004] In order to solve the above technical problems, the technical scheme of the utility model is as follows: a heightening formula tractor gearbox cover assembly, which comprises a cover body, a shift shaft installed in the cover body, a shift input end and a shift output end of the shift shaft, a shift heightening cylinder fixedly installed above the shift input end on the cover body, and a shift lever swingly installed at the upper end of the shift heightening cylinder.

[0005] As a preferred technical scheme, the shift lever comprises a swing connection part, an operating lever body extending out of the shift heightening cylinder is fixedly arranged at the upper part of the swing connection part, and a transmission lever body for driving the shift input lever is fixedly arranged at the lower part of the swing connection part.

[0006] As a preferred technical scheme, the upper end of the gear shift heightening cylinder is integrally provided with a swing connection fixing seat, the swing connection part is installed on the swing connection fixing seat, and a swing connection press fitting seat is buckled on the swing connection fixing seat.

[0007] Due to the adoption of the above technical scheme, the heightening type tractor gearbox cover assembly comprises a cover body, a gear shift shaft is installed in the cover body, the gear shift shaft comprises a gear shift input end and a gear shift output end, a gear shift heightening cylinder located above the gear shift input end is fixedly installed on the cover body, and a gear shift lever is swingingly installed at the upper end of the gear shift heightening cylinder; an upwardly arranged gear shift input rod is fixedly arranged on the gear shift input end, and the lower end of the gear shift lever is used for actuating the gear shift input rod. The gear shift heightening cylinder is additionally arranged on the cover body, the gear shift lever is installed at the upper end thereof, the upwardly arranged gear shift input rod on the gear shift shaft can be used to transmit gear shift control action, the space occupied below the gearbox cover is reduced, and the volume of the gearbox is reduced. The upwardly arranged gear shift input rod and the heightened gear shift lever reduce the length ratio of the upper and lower rods of the gear shift lever, and the gear shift control range is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0008] The following drawings are merely intended to schematically illustrate and explain the present application, and do not limit the scope of the present application. Among them:

[0009] Figure 1 is a sectional view of an embodiment of the present application;

[0010] Figure 2 is Figure 1 is an enlarged schematic view of the structure at the upper end of the gear shift heightening cylinder in the middle;

[0011] Figure 3 is a sectional view of the existing gearbox cover assembly.

[0012] In the drawings: 1-cover body; 2-gear shift shaft; 21-gear shift input end; 22-gear shift output end; 3-gear shift heightening cylinder; 31-swing connection fixing seat; 32-swing connection press fitting seat; 4-gear shift lever; 41-swing connection part; 42-actuating lever body; 43-transmission lever body; 5-gear shift input rod; 9-crank. DETAILED DESCRIPTION

[0013] The present application will be further described below in conjunction with the drawings and embodiments. In the following detailed description, only certain exemplary embodiments of the present application are described by way of illustration. It is obvious for those skilled in the art that the described embodiments can be modified in various ways without departing from the spirit and scope of the present application. Therefore, the drawings and description are illustrative in nature and are not intended to limit the scope of protection of the claims.

[0014] As Figure 1 And Figure 2 As shown in the drawings, the raised tractor gearbox cover assembly comprises a cover body 1, a shift shaft 2 is installed in the cover body 1, the installation of the cover body 1 and the shift shaft 2 thereon is a technology known in the art, which will not be described here. It is also known that the shift shaft 2 comprises a shift input end 21 and a shift output end 22, the shift input end 21 is an end for receiving shift actuation, and the shift output end 22 is an end for outputting the shift actuation through a shift claw.

[0015] A shift-raising cylinder 3 is fixedly installed on the cover body 1 above the shift input end 21, and bolt fixation is preferred. A shift lever 4 is swingably installed at the upper end of the shift-raising cylinder 3; a shift input lever 5 is fixedly provided on the shift input end 21 and arranged upwardly, and the lower end of the shift lever 4 is arranged to actuate the shift input lever 5. Actuation is achieved by arranging a shift actuation groove on one of the lower end of the shift lever 4 and the upper end of the shift input lever 5, and a shift actuation ball on the other, the shift actuation ball being in the shift actuation groove to transmit the shift actuation; this is a known technology, which will not be described here.

[0016] The embodiment adds the shift-raising cylinder 3 to the cover body 1, which raises the installation position of the shift lever 4, and thus the shift input lever 5 can be arranged upwardly on the shift shaft 2. With this arrangement, the embodiment no longer has a crank arm below the shift shaft 2, which reduces the occupied space below the cover body 1 and helps to reduce the volume of the gearbox. The direct upward arrangement of the shift input lever 5 also helps to reduce the length of the shift shaft 2 in the axial direction, which also helps to reduce the volume of the gearbox. The upward shift input lever 5 and the raised shift lever 4 of the embodiment reduce the length ratio of the shift lever 4, which helps to reduce the shift actuation range. In addition, the detachable installation of the shift-raising cylinder 3 allows the embodiment to use different heights of the shift-raising cylinder 3 and the corresponding shift lever 4 according to different tractor cab use environments without changing the cover body 1 and the shift shaft 2, which makes the use more flexible and helps to reduce the batch production cost.

[0017] Preferably, the shift lever 4 comprises a swing connection part 41, an upper part of the swing connection part 41 is fixedly provided with a control rod body 42 extending out of the shift heightening cylinder 3, and a lower part of the swing connection part 41 is fixedly provided with a transmission rod body 43 for shifting the shift input rod 5. The control rod body 42 and the transmission rod body 43 are respectively an upper half part rod body and a lower half part rod body of the shift lever 4, i.e. two parts for reducing the rod length ratio in the embodiment. In the case of increasing the installation height of the swing connection part 41, the upper end height of the control rod body 42 is unchanged, so the length of the control rod body 42 is obviously reduced, and in the case of little change in the length of the transmission rod body 43, the rod length ratio of the control rod body 42 and the transmission rod body 43 is obviously reduced. In actual implementation, the rod length ratio of the shift lever 4 can be reduced from the original 6:1 to 5:1 or even 4:1, and the shift control range in the cab is obviously reduced.

[0018] The swing connection part 41 is installed on the swing connection fixing seat 31, and a swing connection press fitting seat 32 is buckled on the swing connection fixing seat 31. Thus, the swing connection fixing seat 31 can be integrally cast with the shift heightening cylinder 3, simplifying the manufacturing process, and only the swing connection press fitting seat 32 needs to be fixedly installed during assembly, so the assembly is also simple. The swing connection press fitting seat 32 can be directly fixed by bolts or can be fixed after being limited by a check ring structure, which is not limited herein, and the embodiment only illustrates the latter. The swing connection part 41 can be a ball or a pin according to the shift swing direction requirement, which is not limited herein.

[0019] The basic principle, main features and advantages of the utility model are shown and described above. It should be understood by those skilled in the art that the utility model is not limited by the above embodiments, and the above embodiments and the description in the specification only illustrate the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model can also have various changes and improvements, and these changes and improvements all fall within the scope of the utility model claimed. The scope of protection of the utility model is defined by the appended claims and their equivalents.

Claims

1. A height-adjustable tractor gearbox cover assembly, comprising a cover body, wherein a shift shaft is installed within the cover body, the shift shaft comprising a shift input end and a shift output end, characterized in that: A shift lift cylinder is fixedly installed on the cover above the shift input end, and a shift lever is swayingly installed at the upper end of the shift lift cylinder; a shift input lever is fixedly provided on the shift input end and is set upward, and the lower end of the shift lever is used to move the shift input lever.

2. The height-adjustable tractor gearbox cover assembly as described in claim 1, characterized in that: The shift lever includes a swing connection part, the upper part of which is fixedly provided with an operating lever body that extends out of the shift lift cylinder, and the lower part of which is fixedly provided with a transmission rod body for moving the shift input lever.

3. The height-adjustable tractor gearbox cover assembly as described in claim 2, characterized in that: The upper end of the shift booster cylinder is integrally provided with a swing connection fixing seat, the swing connection part is installed on the swing connection fixing seat, and a swing connection press-fit seat is fastened on the swing connection fixing seat.

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