JPH04136926U - Tractor front wheel transmission structure - Google Patents

Abstract

(57) [Summary] [Purpose] To facilitate the assembly and disassembly of the front wheel drive transmission shaft that passes through the oil pan at the bottom of the engine in the front and back. [Structure] The transmission shaft 22 passed through the shaft insertion hole 27 of the oil pan 25 and the input shaft 21 of the front axle case 7 are butted together in a substantially abutting state, and spline-connected with the first coupling sleeve 23. and the front wheel drive shaft 11 of the transmission case 5 are spline-connected with a second coupling sleeve 24 in a state where they face each other with a large interval L, and the transmission shaft is connected with pins 28 and 29 driven into the second coupling sleeve 24. The back and forth movement of the transmission shaft 22 is stopped, and the rearward movement of the transmission shaft 22 is allowed by removing the pins 28 and 29.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This idea consists of a front wheel drive shaft that protrudes forward from the transmission case, and a Connect the input shaft that protrudes rearward from the front axle case to the input shaft provided at the rear of the front axle case. A tractor's front wheel transmission mechanism that is linked and connected by a transmission shaft that passes through the engine's oil pan. Regarding construction.

0002

[Conventional technology]

For example, as shown in FIG. 5, the conventional transmission structure described above has a A concave groove 32 penetrating back and forth is formed in the bottom of the provided oil pan 25, and a groove 32 is formed therein. There is a structure in which the transmission shaft 22 is inserted and stored together with the telescopic cover tubes 30a and 30b. Ru.

0003

[Problem that the idea aims to solve]

In the above conventional structure, even if the oil pan 25 and the front axle case 7 are close to each other, the transmission Assembly and disassembly in order to reach the connecting part between the shaft 22 and input shaft 21 from below the groove 32. Although it is convenient for 32 is also deep, making machining difficult, and the oil pan is difficult to form due to the concave grooves. There was also the problem that the volume could not be made sufficiently large. This invention reduces the oil pan volume without significantly reducing the assembly and disassembly performance of the transmission shaft. The purpose of this invention is to provide a front wheel transmission structure that can increase the

0004

[Means to solve the problem]

In order to achieve the above purpose, in this invention, a Connect the front wheel drive shaft that has come out and the input shaft that protrudes rearward from the front axle case at the front of the vehicle. Interlocking via a transmission shaft that passes through the engine oil pan located at the rear of the front axle case In the front wheel transmission structure of a tractor that is tied together, A shaft insertion hole is formed that penetrates the oil pan in the front and back, and the input shaft and the transmission shaft are connected to each other. the first coupling sleeve so that it is in approximate contact with the inside of the shaft insertion hole; In addition to spline connection, the transmission shaft and front wheel drive shaft are connected to the rear of the oil pan. Butt them together with a large gap between them and spline them with the second coupling sleeve. This second coupling prevents the sleeve from moving back and forth and also has a transmission function. A pin that prevents the shaft from moving backwards is installed in a removable manner, and this pin can be removed. In this state, the second coupling sleeve is allowed to move forward or backward; By moving the transmission shaft backward, the shaft connection at the first coupling sleeve is released. Set the abutment interval between the transmission shaft and the front wheel drive shaft in the assembled state as follows. Ta.

[0005]

[Effect]

According to the above configuration, for example, when the front wheel transmission system is disassembled in the assembled state shown in FIG. If it becomes necessary to remove the rear end of the rear cover tube 30b from the transmission case 5, first Remove the second coupling, push it into the shaft insertion hole 27 of the oil pan 25, and then remove the second coupling. The sleeve 24 is exposed. Next, remove the pin 28 or 28, 29, and While moving the coupling sleeve 24 forward and removing it from the front wheel drive shaft 11, , the transmission shaft 22 is moved rearward until it hits the drive shaft 11. After this transmission shaft 22 The transmission shaft 22 is pulled out from the first coupling sleeve 23 by moving in the opposite direction. , tilt the transmission shaft 22 appropriately and pull it out from the shaft insertion hole 27 rearward. Furthermore, the transmission shaft 22 is assembled by performing the above operations in reverse order.

[0006]

[Effect of the idea]

As described above, according to the present invention, the oil pan has a through hole through which the transmission shaft is inserted back and forth. Since the shaft insertion hole is Since an oil reservoir is formed at the bottom, a large capacity oil pan can be constructed. Ru. Moreover, the assembly and disassembly of the transmission shaft can only be done using the second coupling sleeve located at the rear of the oil pan. Since you only need to operate the connection part using the Even if the connecting part is inside the shaft insertion hole, it can be operated relatively easily in the large space behind the oil pan. I can make it. In other words, it has excellent workability during assembly and disassembly while ensuring a large oil pan capacity. This made it possible to construct a front wheel transmission structure.

[0007]

【Example】

FIG. 3 shows an overall side view of a tractor to which the present invention is applied. This tractor has an engine 2 mounted on the front part of a main frame 1, and a main frame 1. Rear mission case 3 containing the main mission is connected to the rear of frame 1. The main clutch housing 4 and the front transmission case 5 are connected to the rear of the engine 2. The power input to the rear transmission case 3 via the main clutch changes gears accordingly. is transmitted to the rear wheels 6, and its gear change output is branched to the front transmission case. after being input to the base 5, it is transmitted to the front wheels 8 for steering via the front axle case 7. It is configured like this. As shown in Fig. 4, the front mission case 5 has a an input shaft 9 that receives the power, a front wheel transmission mechanism 10 that shifts this input into two high and low stages; A front wheel drive shaft 11 for output to the front axle case 7 is provided. Front wheel shifting A mechanism 10 shifts a shift member 13 spline-connected to a gear shift shaft 12 to the right in the figure. The input shaft 9 and the transmission shaft 12 are directly connected by interlockingly connecting them to the gear 14 from the side. When the high speed state is obtained, the shift member 13 is shifted to the left in the figure, and the multi-disc friction clutch 15 is activated. By operating the shift shaft 1 through the transmission system of gears 14, 16, 17, and 18, 2 is now being sped up. Then, in a low speed state, the circumferential speed of the front wheels 8 is higher than that of the rear wheels 6. It is set to be approximately the same as the circumferential speed, and the steering angle of the front wheels 8 is greater than the set value. and the shift member 13 is automatically operated by the shift fork 19 to enter the high speed state. It is possible to switch. Note that a needle thrust bearing is provided at the fork receiving portion of the shift member 13. 20 to prevent wear and seizure. FIG. 1 shows the transmission structure from the front transmission case 5 to the front axle case 7. There is. The front wheel drive shaft 11 and the front axle case 7 protrude forward from the front transmission case 5. The input shaft 21 protrudes rearward from the transmission shaft 22 and a pair of front and rear coupling sleeves. The front wheel transmission system is connected to the engine 2 by the engine 2. Installed through the shaft insertion hole 27 formed by penetrating the pipe 26 back and forth into the Lupin 25 has been done. To be more specific, the input shaft 21 and the transmission shaft 22 are butted against each other with a slight interval between them. 1 is spline-connected with a coupling sleeve 23, and each shaft 21, 22 has a spline connection. The plines are formed to have the necessary length to fit the coupling sleeve 23. . Further, the transmission shaft 22 and the front wheel drive shaft 11 are connected to each other through the first coupling sleeve 23. The second cover is butted together with a distance L larger than the length required to remove the shaft 22. The spline connection is made with a coupling sleeve 24, and the spline of the transmission shaft 22 moves this coupling sleeve 24 forward greatly to remove it from the front wheel drive shaft 11. It is formed over a length that can be removed. And this second couple The shaft end of the front wheel drive shaft 11 and the shaft end of the transmission shaft 22 are in contact with the shaft end of the front wheel drive shaft 11 and the shaft end of the transmission shaft 22 in the middle of the grease sleeve 24. Two pins 28, 29 are driven into place, thereby connecting the second coupling sleeve. The back and forth movement of the blade 24 is prevented. Note that the front wheel rolling system is surrounded by the front transmission case 5 and the front axle case 7. Protective telescopic cover tubes 30a and 30b are installed, and rubber covers are installed at the telescopic parts. -31 is fitted externally. The front wheel transmission structure of the present invention is constructed as described above, and the next step is to disassemble and assemble it. The procedure will be explained below. (1) When disassembling from the assembled state shown in Fig. 1, first Remove it from the front transmission case 5 and push it far forward. (2) Next, remove the two pins 28 and 29 (or just the front pin 28) and 2. Move the coupling sleeve 24 forward, and Pull it out from the front wheel drive shaft 11. (3) Connect the transmission shaft 22 so that its rear end (or the remaining pin 29) is connected to the front wheel drive shaft 11. By moving the front end of the transmission shaft 22 backward until it makes contact with the first coupling sleeve, Remove it from the tab 23. (4) Pull out the transmission shaft 22 backward from the shaft insertion hole 27 of the oil pan 25 while tilting it. . The transmission shaft 22 can be assembled by performing the above procedure in reverse.

[0008] In addition, symbols are written in the claims section of the utility model registration for convenience of comparison with the drawings. However, the present invention is not limited to the configuration shown in the attached drawings.

[Brief explanation of drawings]

[Figure 1] Partially cutaway side view of main parts

[Figure 2] Longitudinal front view of main parts

[Figure 3] Overall side view of the tractor

[Figure 4] Longitudinal side view of the front transmission case

[Fig. 5] Partially cutaway side view of main parts showing a conventional front wheel transmission structure

[Explanation of symbols]

2 engine 5 Mission case 11 Front wheel drive shaft 21 Input shaft 22 Transmission shaft 23 First coupling sleeve 24 Second coupling sleeve 25 Oil pan 27 Shaft insertion hole L interval

Claims (1)

[Scope of utility model registration request] [Claim 1] The front wheel drive shaft (11) protruding forward from the transmission case (5) and the input shaft (21) protruding rearward from the front axle case (7) at the front of the vehicle body are connected to the rear of the front axle case. In the front wheel transmission structure of a tractor, the front wheel transmission structure of a tractor is interlocked and connected by a transmission shaft (22) passing through an oil pan (25) of an engine (2) installed in the engine (2).
5) is configured with a shaft insertion hole (27) that penetrates back and forth, and the input shaft (21) and the transmission shaft (22) are inserted into the shaft insertion hole (27).
7), the transmission shaft (22) and the front wheel drive shaft (11) are connected by a spline connection with the first coupling sleeve (23) so that they are substantially in contact with each other, and the transmission shaft (22) and the front wheel drive shaft (11) are positioned at the rear of the oil pan (25). The second coupling sleeve (24) abuts against each other with a large interval (L) and is spline-connected with the second coupling sleeve (24). 2
pins (28), (2) that prevent the
9) is attached in a removable manner, and in this pin removed state, the second coupling sleeve (24) is allowed to move forward or backward, and by the backward movement of the transmission shaft (22), the first coupling sleeve Transmission shaft (22) in the assembled state so that the shaft connection at (23) is released.
A front wheel transmission structure for a tractor, in which the butt interval (L) between the front wheel drive shaft (11) and the front wheel drive shaft (11) is set.