Hydraulic transmission device of tail wheel mechanism

Abstract

A hydraulic transmission device of a tail wheel mechanism comprises a gear transmission box (1) connected with a chassis transmission box (20) and a gear oil pump (21), a carrier gear (14) and a cylindrical gear (6) which are meshed with each other are arranged in the gear transmission box (1), and a cross slider connector (2) connected with a power input shaft (15) of the gear oil pump (21) is arranged at one end of the cylindrical gear (6). An opening is formed in a box body of the chassis transmission box (20), the gear transmission box (1) is installed on the opening of the chassis transmission box (20), and the carrier gear (14) is in meshing transmission with a power output gear (22) of the chassis transmission box (20). The gear transmission case has the advantages that the gear transmission case is arranged between the chassis transmission case and the gear oil pump, the rated rotating speed of the oil pump is met through gear transmission and gear speed change, and the problems that a belt is not durable and hydraulic oil supply is unstable are effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical equipment, and particularly relates to a hydraulic transmission device for a tail wheel mechanism. Background Art

[0002] The walking tractor is not only a very widely applicable agricultural means of transporting agricultural materials in rural areas, but also an essential farming machine. When the walking tractor is performing rotary tillage operations, the tail wheel component is an important component for supporting the tractor to walk in the field. When it is externally equipped with a "rotary tiller", the height of the tail wheel must be adjusted to control the depth of rotary tillage. Therefore, the lifting adjustment of the tail wheel is a very important link in rotary tillage operations.

[0003] In the past, the tail wheel mechanism used a screw rod, a nut, and a crank handle for adjustment. During operation, due to the vibration of the machine, the screw rod and nut were prone to loosening, resulting in poor stability, inconvenient adjustment, and low work efficiency.

[0004] In view of the above deficiencies, we adopted a hydraulic device and added a one-way hydraulic cylinder, an oil pump, a pulley, an oil pipeline, and a control mechanism (see the attached Figure 4 : Installation schematic diagram of the tail wheel mechanism). When it was first used, users were satisfied as it was more advanced and easier to operate than before. However, after using it for some time, the following problems were found: 1. The belt was not durable and it was inconvenient to replace the belt; 2. The hydraulic oil supply was unstable. Since the power for the oil pump was provided by the prime mover of the diesel engine on the walking tractor without speed change, the rotational speed was too high, resulting in the belt being not durable. At the same time, due to the high rotational speed, high temperature was generated, causing the rubber belt to elongate, resulting in slip and power reduction, thus causing unstable oil supply. Content of the Utility Model

[0005] The purpose of the utility model is to provide a hydraulic transmission device for a tail wheel mechanism in view of the above deficiencies.

[0006] The utility model includes a gear transmission box connecting a chassis transmission box and a gear oil pump.

[0007] In the gear transmission box, an intermediate gear and a cylindrical gear that mesh with each other are respectively provided. One end of the cylindrical gear is provided with a cross-slider connector connected to the power input shaft of the gear oil pump. An opening is provided on the box body of the chassis transmission box, and the gear transmission box is installed on the opening of the chassis transmission box, and the intermediate gear meshes with the power output gear of the chassis transmission box for transmission.

[0008] In the gear transmission box, a spline shaft and an intermediate shaft are respectively provided. The spline shaft is movably installed in the gear transmission box through a bearing, the cylindrical gear is fixedly connected to the spline shaft through a spline, the intermediate shaft is fixedly connected in the gear transmission box, and the intermediate gear is movably installed on the intermediate shaft through a bearing.

[0009] One side of the gear transmission box is provided with a spline shaft mounting hole, and a bearing cover is provided on the spline shaft mounting hole. Inside the gear transmission box at one end of the cross-slider connector, there is a spline shaft oil seal for sealing the spline shaft.

[0010] Inside the gear transmission box at the connection end with the gear oil pump, there is a centering sleeve.

[0011] The gear transmission box is provided with a cross-shaft mounting hole, and at both ends of the cross-shaft mounting hole, there are respectively a spacer sleeve and a cross-shaft oil seal for sealing the cross-shaft.

[0012] The advantages of the present utility model are: A gear transmission box is provided between the chassis transmission box and the gear oil pump. Through gear transmission and gear speed change, the rated speed of the oil pump is satisfied, effectively solving the problems of the belt being not durable and the hydraulic oil supply being unstable. Description of the Drawings

[0013] Figure 1 It is a schematic structural diagram of the present utility model.

[0014] Figure 2 It is a schematic connection structure diagram of the gear transmission box and the gear oil pump.

[0015] Figure 3 It is a schematic internal structure diagram of the gear transmission box.

[0016] Figure 4 It is a schematic installation diagram of the original tail wheel mechanism.

[0017] Figure 5 It is a schematic installation diagram of the improved original tail wheel mechanism. Detailed Description of the Invention

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and illustrated herein can be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the present utility model claimed, but merely represents selected embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present utility model. It should be noted that: Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0020] In the description of the embodiments of the present utility model, it should be noted that if terms such as "upper", "lower", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present utility model is usually placed during use, it is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to the present utility model. In addition, in the description of the present utility model, if terms such as "first", "second", etc. are only used for distinguishing descriptions, they cannot be construed as indicating or implying relative importance.

[0021] In the description of the embodiments of the present utility model, it should also be noted that unless otherwise clearly specified and limited, if terms such as "set", "connected" are understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0022] As shown in the drawings, the present utility model includes a gear transmission box 1 connecting a chassis transmission box 20 and a gear oil pump 21.

[0023] In the gear transmission box 1, an over-running gear 14 and a cylindrical gear 6 that mesh with each other are respectively provided. One end of the cylindrical gear 6 is provided with a cross-slider connector 2 connected to the power input shaft 15 of the gear oil pump 21. An opening is provided on the box body of the chassis transmission box 20, and the gear transmission box 1 is installed on the opening of the chassis transmission box 20, and the over-running gear 14 meshes with and drives the power output gear 22 of the chassis transmission box 20.

[0024] In this case, a rectangular hole for installing gears is opened on the box body of the chassis transmission box 20 of the walking tractor. The box body of the gear transmission box 1 is fixed on the rectangular hole through a set of screws. A part of the over-running gear 14 extends into the rectangular hole and meshes with and drives the power output gear 22 in the chassis transmission box 20. The gear transmission box 1 transmits the kinetic energy of the chassis transmission box 20 to the gear oil pump 21 after gear speed change, thereby driving the gear oil pump 21 to work, maintaining the stability of hydraulic oil supply, and at the same time solving the problems of the belt being not durable and difficult to replace.

[0025] Specifically, a spline shaft 10 and an over-running shaft 11 are respectively provided in the gear transmission box 1. The spline shaft 10 is movably installed in the gear transmission box 1 through bearings. The cylindrical gear 6 is fixedly connected to the spline shaft 10 through splines. The over-running shaft 11 is fixedly connected in the gear transmission box 1, and the over-running gear 14 is movably installed on the over-running shaft 11 through bearings.

[0026] One side of the gear transmission case 1 is provided with a spline shaft mounting hole, and a bearing cover 7 is provided on the spline shaft mounting hole. Inside the gear transmission case 1 at one end of the cross slider connector 2, there is a spline shaft oil seal 4 for sealing the spline shaft 10.

[0027] Inside the gear transmission case 1 at the connection end with the gear oil pump 21, there is a centering sleeve 3.

[0028] The gear transmission case 1 is provided with a cross shaft mounting hole, and at both ends of the cross shaft mounting hole, there are respectively a spacer sleeve 12 and a cross shaft oil seal 16 for sealing the cross shaft 11.

[0029] Both the spline shaft oil seal 4 and the cross shaft oil seal 16 are provided with skeletons to improve the strength of the oil seal.

[0030] The tail wheel mechanism includes a tail wheel fork 30, a lifting inner cylinder 34, a lead screw 35, a guide cylinder 38, and a hydraulic cylinder 32. The bottom of the tail wheel fork 30 is provided with a hub 31. One end of the top of the tail wheel fork 30 is provided with a connecting rod, and it can be installed on the lifting inner cylinder 34 in a liftable manner through the connecting rod. The lead screw 35 is installed on the lifting inner cylinder 34 and drives the connecting rod to move up and down to finely adjust the height of the tail wheel fork 30.

[0031] The tail wheel fork 30 is movably connected to the connecting rod, and the tail wheel fork 30 can rotate on the connecting rod. There are pedals on both sides of the tail wheel fork 30 to control the direction of the tail wheel fork 30 through the pedals. The guide cylinder 38 is fixedly installed on the main body frame 41 of the tractor, the lifting inner cylinder 34 is movably installed inside the guide cylinder 38, and both ends of the hydraulic cylinder 32 are respectively connected to the lifting inner cylinder 34 and the guide cylinder 38 to drive the lifting inner cylinder 34 to move up and down inside the guide cylinder 38 to quickly adjust the height of the tail wheel fork 30.

[0032] There is a gear oil pump 21 on the main body frame 41. The power input shaft 15 of the gear oil pump 21 is provided with a pulley. The gear oil pump 21 is driven by a belt 43 to be transmitted with the chassis transmission case of the tractor. The oil outlet of the gear oil pump 21 is communicated with the oil inlet hole of the hydraulic cylinder 32 through an oil pipe 45. There is a connecting rod control mechanism 42 for controlling the opening and closing of the oil outlet on one side of the gear oil pump 21, and the action of the hydraulic cylinder 32 is controlled through the connecting rod control mechanism 42.

[0033] After improvement, a gear transmission case 1 is added between the gear oil pump 21 and the chassis transmission case, the box body of the chassis transmission case is transformed, so that the gear transmission case 1 is connected to the chassis transmission case as a whole, and kinetic energy is transmitted to the gear oil pump 21 through gear transmission.

Claims

1. A hydraulic transmission device for a tail wheel mechanism, characterized in that It comprises a gear transmission box (1) connected to a chassis transmission box (20) and a gear oil pump (21), A gear transmission box (1) is provided with meshing bridge gears (14) and cylindrical gears (6), one end of the cylindrical gear (6) is provided with a cross slide connector (2) connected to a power input shaft (15) of a gear oil pump (21), an opening is provided on a chassis transmission box (20), the gear transmission box (1) is mounted on the opening of the chassis transmission box (20), and the bridge gear (14) is meshed with a power output gear (22) of the chassis transmission box (20) for transmission.

2. A hydraulic transmission device for a tail wheel mechanism according to claim 1, characterized in that A spline shaft (10) and a bridge shaft (11) are respectively provided in the gear transmission box (1); the spline shaft (10) is movably mounted in the gear transmission box (1) via a bearing; the cylindrical gear (6) is fixedly connected to the spline shaft (10) via a spline; the bridge shaft (11) is fixedly connected to the gear transmission box (1); and the bridge gear (14) is movably mounted on the bridge shaft (11) via a bearing.

3. A hydraulic transmission device for a tail wheel mechanism according to claim 2, characterized in that A spline shaft mounting hole is provided on one side of the gear transmission box (1), and a bearing cover (7) is provided on the spline shaft mounting hole. A spline shaft oil seal (4) for sealing the spline shaft (10) is provided in the gear transmission box (1) at one end of the cross slider connector (2).

4. A tail wheel mechanism hydraulic transmission device according to claim 2, characterized in that A bridge shaft mounting hole is provided on the gear transmission box (1), and a spacer (12) and a bridge shaft oil seal (16) for sealing the bridge shaft (11) are respectively provided at both ends of the bridge shaft mounting hole.

5. The hydraulic transmission device of the tail wheel mechanism according to claim 1, characterized in that A centering sleeve (3) is provided in the gear transmission box (1) at the end connected to the gear oil pump (21).

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