CN113473837B

CN113473837B - Speed change device for agricultural work vehicle

Info

Publication number: CN113473837B
Application number: CN202080015417.9A
Authority: CN
Inventors: 韩仲洙; 朴元雨; 刘知勋; 金铎性; 李永揆; 金载坤
Original assignee: LS Mtron Ltd
Current assignee: LS Mtron Ltd
Priority date: 2019-03-20
Filing date: 2020-03-19
Publication date: 2023-07-14
Anticipated expiration: 2040-03-19
Also published as: CN113473837A

Abstract

The present invention relates to a transmission device for an agricultural work vehicle, comprising: a front-stage transmission unit that performs transmission of a drive transmitted from an engine of an agricultural work vehicle; a clutch section connected to the preceding-stage transmission section to selectively output the drive transmitted from the preceding-stage transmission section; an adjustment unit connected to the clutch unit; and a rear-stage shifting portion connected to the adjusting portion to perform shifting of the drive transmitted from the adjusting portion, the adjusting portion including: a first adjustment mechanism connected to a first clutch mechanism in the clutch section; a second adjustment mechanism connected to a second clutch mechanism in the clutch section; and the combination mechanism is connected with the first adjusting mechanism and the second adjusting mechanism, and the rear-stage gear shifting part comprises a rear-stage gear shifting mechanism connected with the combination mechanism.

Description

Speed change device for agricultural work vehicle

Technical Field

The present invention relates to a transmission for an agricultural work vehicle for adjusting the speed of the agricultural work vehicle.

Background

An agricultural work vehicle is a vehicle for planting crops necessary for human life using land. For example, combine (Combine), tractor (Tractor), rice seedling planting machine, and the like belong to agricultural work vehicles. The combine harvester performs operations of harvesting and threshing crops such as rice, barley, wheat, soybean, and the like. The tractor uses traction to perform the work required to plant the crop. The transplanting machine performs a work of transplanting seedlings growing in the seedbed or the seedling box to a paddy field.

Such agricultural work vehicles include a transmission to adjust torque, speed, etc. as needed during operation.

Fig. 1 is a schematic block diagram of a transmission of an agricultural work vehicle according to the prior art.

Referring to fig. 1, a transmission 100 of an agricultural work vehicle according to the related art includes a primary transmission portion 110 that performs a transmission on a drive transmitted from an engine 10, and a secondary transmission portion 120 that performs a transmission on a drive transmitted from the primary transmission portion 110.

The primary transmission portion 110 includes: a first drive shaft 111, a first speed change gear 112, a second speed change gear 113, a first sleeve 114, a second drive shaft 115, a third speed change gear 116, a fourth speed change gear 117, and a second sleeve 118.

The first drive shaft 111 is coupled with the first speed change gear 112, the second speed change gear 113, and the first sleeve 114.

The first speed gear 112 and the second speed gear 113 are coupled to the first drive shaft 111 so as to be capable of idling. The second speed change gear 113 and the first speed change gear 112 are formed to have different diameters.

The first sleeve 114 is coupled to the first driving shaft 111 to be located between the first speed change gear 112 and the second speed change gear 113. The first sleeve 114 is coupled to the first driving shaft 111 to rotate together. When the first sleeve 114 is not engaged with both the first speed change gear 112 and the second speed change gear 113, the first sleeve 114 is in a neutral state. The first sleeve 114 is in a meshed state when the first sleeve 114 is meshed with the first speed gear 112 or the second speed gear 113.

The third speed gear 116, the fourth speed gear 117, and the second sleeve 118 are coupled to the second drive shaft 115. The second driving shaft 115 and the first driving shaft 111 are arranged parallel to each other.

The third speed gear 116 and the fourth speed gear 117 are coupled to the second drive shaft 115 so as to be capable of idling. The fourth speed change gear 117 and the third speed change gear 116 are formed to have different diameters.

The second sleeve 118 is coupled to the second driving shaft 115 to be located between the third speed gear 116 and the fourth speed gear 117. The second sleeve 118 is coupled to the second drive shaft 115 to rotate together. When the second sleeve 118 is not engaged with neither the third speed gear 116 nor the fourth speed gear 117, the second sleeve 118 is in a neutral state. The second sleeve 118 is in a meshed state when the second sleeve 118 is meshed with the third speed gear 116 or with the fourth speed gear 117.

Here, in the transmission 100 of the agricultural work vehicle according to the related art, when the first sleeve 114 and the second sleeve 118 are simultaneously in the engaged state, there is a risk of damage or breakage of the primary transmission portion 110 or the secondary transmission portion 120. Thus, if the first sleeve 114 is in the occluded state, the second sleeve 118 should not be in the occluded state until the first sleeve 114 is in the neutral state. If the second sleeve 118 is in the occluded state, the first sleeve 114 should not be in the occluded state until the second sleeve 118 is in the neutral state. Therefore, in the transmission 100 of the agricultural work vehicle according to the related art, since both the first sleeve 114 and the second sleeve 118 need to undergo the process of being in the neutral state, there is a problem in that rattling, shock, and the like occur during the shifting.

Disclosure of Invention

Problems to be solved by the invention

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a transmission device for an agricultural work vehicle that can reduce rattle, shock, and the like occurring during a gear shift.

Means for solving the problems

In order to solve the above-described problems, the present invention may include the following constitution.

The transmission device of an agricultural work vehicle according to the present invention may include: a front-stage transmission unit that performs transmission of a drive transmitted from an engine of an agricultural work vehicle; a clutch section connected to the preceding-stage transmission section to selectively output the drive transmitted from the preceding-stage transmission section; an adjustment unit connected to the clutch unit; and a rear-stage shifting portion connected to the adjusting portion to perform shifting of the drive transmitted from the adjusting portion. The front stage shift portion may include: a first preceding-stage transmission mechanism that performs a transmission on a drive transmitted from the engine; a second front-stage transmission mechanism performs a transmission on the drive transmitted from the engine. The clutch portion may include: a first clutch mechanism connected with the first preceding-stage transmission mechanism to selectively output drive transmitted thereto from the first preceding-stage transmission mechanism; a second clutch mechanism is connected with the second preceding-stage transmission mechanism to selectively output the drive transmitted thereto from the second preceding-stage transmission mechanism. The adjusting part may include: the first adjusting mechanism is connected with the first clutch mechanism; the second adjusting mechanism is connected with the second clutch mechanism; and a combination mechanism connected with both the first adjusting mechanism and the second adjusting mechanism. The rear-stage transmission may include a rear-stage transmission mechanism connected to the combining mechanism.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, the following effects can be obtained.

The present invention is implemented to enable further shifting to be performed using one rear-stage shifting mechanism for driving shifting by the front-stage shifting portion, so that the ease of manufacturing the rear-stage shifting portion can be improved, and the cost of manufacturing the rear-stage shifting portion can be facilitated to be reduced.

The invention realizes that the sleeve can perform speed change without going through a neutral state, thereby reducing shaking, impact and the like in the speed change process, and being beneficial to providing a stable driving environment for a driver.

The present invention realizes that the first-stage transmission mechanism and the second-stage transmission mechanism can be shared or modularized, so that the ease of manufacturing the first-stage transmission mechanism and the second-stage transmission mechanism can be improved, and the cost of manufacturing the first-stage transmission mechanism and the second-stage transmission mechanism can be reduced.

Drawings

Fig. 2 is a schematic block diagram of a transmission of an agricultural work vehicle according to the present invention.

Fig. 3 to 12 are power transmission schematic views of a transmission of an agricultural work vehicle according to the present invention.

Fig. 13 is a conceptual diagram for explaining the arrangement of a first adjusting gear, a second adjusting gear, a first combining gear, and a second combining gear in the transmission of the agricultural work vehicle according to the present invention.

Fig. 14 to 17 are power transmission schematic views of a transmission of an agricultural work vehicle according to a modified embodiment of the present invention.

Detailed Description

An embodiment of a transmission device for an agricultural work vehicle according to the present invention will be described in detail with reference to the accompanying drawings.

Referring to fig. 2, a transmission 1 of an agricultural work vehicle according to the present invention is provided in an agricultural work vehicle (not shown) such as a tractor, a combine, a rice transplanter, or the like. The transmission device 1 for an agricultural work vehicle according to the present invention realizes a transmission function of adjusting torque, speed, and the like as needed, for driving transmitted from the engine 10 of the agricultural work vehicle. The transmission 1 of the agricultural work vehicle according to the present invention may include a front-stage transmission portion 2, a clutch portion 3, an adjusting portion 4, and a rear-stage transmission portion 5.

Referring to fig. 2 and 3, the front stage transmission section 2 performs a transmission of the drive transmitted from the engine 10. The pre-stage transmission 2 may be directly connected to the engine 10. The front stage transmission section 2 may also be connected to the engine 10 through a first transmission section (not shown). In this case, the drive generated by the engine 10 may be input to the preceding-stage transmission portion 2 through the first transmission portion. Hereinafter, the drive transmitted from the engine 10 includes not only the case of direct transmission from the engine 10 but also the case of transmission from the engine 10 through the first transmission portion. For example, the first transmission portion may include a forward/reverse transmission portion for performing a forward/reverse transmission. The first transmission portion may include an ultra-low speed transmission portion for performing ultra-low speed transmission. The preceding-stage transmission unit 2 may be implemented as a main transmission unit or a sub-transmission unit. Hereinafter, an embodiment in which the preceding stage transmission unit 2 is implemented as a main transmission unit will be described as an example.

The pre-stage transmission section 2 may include a first pre-stage transmission mechanism 21 and a second pre-stage transmission mechanism 22.

The first-stage transmission mechanism 21 performs a speed change on the drive transmitted from the engine 10. The first preceding-stage transmission mechanism 21 may be connected to the clutch portion 3. The drive transmitted from the engine 10 may be transmitted to the clutch portion 3 via the first-stage transmission mechanism 21.

The first backing shift mechanism 21 may include a plurality of first backing shift gears 211 and a first backing shift sleeve 212.

The first front stage transmission gear 211 rotates with the drive transmitted from the engine 10. The first front stage transmission gear 211 may be idly coupled to the first front stage transmission shaft 213. Bearings (not shown) may be provided between the plurality of first-stage transmission gears 211 and the first-stage transmission shaft 213. The plurality of first-stage transmission gears 211 may be arranged to be spaced apart from each other along the first axial direction (X-axis direction). The first axial direction (X-axis direction) is an axial direction parallel to the first-stage shift shaft 213. A plurality of the first-stage transmission gears 211 may be formed to have different diameters.

The first backing shift sleeve 212 selectively engages the first backing shift gear 211. The first backing-up shift sleeve 212 may be disposed between a plurality of the first backing-up shift gears 211 with respect to the first axial direction (X-axis direction). The first-stage transmission sleeve 212 may be brought into a meshed state when it is meshed with any one of the plurality of first-stage transmission gears 211. The first-stage shift sleeve 212 may reach a neutral state when spaced apart from all of the first-stage shift gears 211. The first pre-shift sleeve 212 may be coupled with the first pre-shift shaft 213. Therefore, when the first-stage shift sleeve 212 is engaged with any one of the plurality of first-stage shift gears 211, the first-stage shift sleeve 212 can rotate the first-stage shift shaft 213 while rotating. When the first-stage shift sleeve 212 is spaced apart from all of the first-stage shift gears 211, the first-stage shift sleeve 212 and the first-stage shift shaft 213 do not rotate even if a plurality of the first-stage shift gears 211 rotate. The first prior stage shift sleeve 212 may be a synchronizer sleeve (Synchronizer Sleeve).

The first-stage transmission mechanism 21 may further include a plurality of the first-stage transmission sleeves 212 according to the number of shift stages executable by the pre-stage shift portion 2. In this case, the first-stage shift sleeves 212 may be selectively engaged with the first-stage shift gears 211 disposed on both sides, respectively. The first-stage shift sleeves 212 may be selectively engaged with the first-stage shift gears 211 disposed on one side, respectively. In the case where the first-stage shift sleeve 212 is provided in plural numbers, the plural first-stage shift sleeves 212 may be individually moved.

The second preceding-stage transmission mechanism 22 performs a shift of the drive transmitted from the engine 10. The second preceding stage transmission mechanism 22 may be connected to the clutch portion 3. The drive transmitted from the engine 10 may be transmitted to the clutch portion 3 via the second pre-stage transmission mechanism 22.

The second pre-stage transmission 22 may include a plurality of second pre-stage transmission gears 221 and a second pre-stage transmission sleeve 222.

The second front stage transmission gear 221 rotates with the drive transmitted from the engine 10. The second front stage transmission gear 221 may be idly coupled to a second front stage transmission shaft 223. Bearings (not shown) may be provided between the plurality of second front stage transmission gears 221 and the second front stage transmission shaft 223. The second front stage shift shaft 233 may be arranged in parallel with the first axial direction (X-axis direction). The plurality of second front stage transmission gears 221 may be arranged to be spaced apart from each other along the first axial direction (X-axis direction). A plurality of the second pre-stage transmission gears 221 may be formed to have different diameters.

The second backing sleeve 222 selectively engages a plurality of the second backing gears 221. The second backing-up shift sleeve 222 may be disposed between the plurality of second backing-up shift gears 221 with reference to the first axial direction (X-axis direction). The second pre-stage shift sleeve 222 may be brought into a meshed state when it is meshed with any one of the plurality of second pre-stage shift gears 221. The second pre-stage shift sleeve 222 may reach a neutral state when spaced apart from all of the second pre-stage shift gears 221. The second pre-shift sleeve 222 may be coupled with the second pre-shift shaft 223. Therefore, when the second pre-stage shift sleeve 222 is engaged with any one of the plurality of second pre-stage shift gears 221, the second pre-stage shift sleeve 222 can rotate the second pre-stage shift shaft 223 while rotating. When the second-stage transmission sleeve 222 is spaced apart from all of the second-stage transmission gears 221, the second-stage transmission sleeve 222 and the second-stage transmission shaft 223 do not rotate even if a plurality of the second-stage transmission gears 221 rotate. The second pre-stage shift sleeve 222 may be a synchronizer sleeve.

The second pre-stage transmission mechanism 22 may further include a plurality of the second pre-stage shift sleeves 222 according to the number of shift stages executable by the pre-stage shift portion 2. In this case, the second pre-stage shift sleeves 222 may be selectively engaged with the second pre-stage shift gears 221 disposed at both sides, respectively. The second backing-up shift sleeve 222 may also be selectively engaged with the second backing-up shift gears 221 disposed on one side, respectively. In the case where the second preceding-stage shift sleeve 222 is provided in plural, the plurality of second preceding-stage shift sleeves 222 may be individually moved.

Referring to fig. 2 and 3, the pre-shift portion 2 may include a pre-shift input mechanism 23.

The front-stage transmission input mechanism 23 transmits the drive transmitted from the engine 10 to the first front-stage transmission mechanism 21 and the second front-stage transmission mechanism 22, respectively. The first-stage transmission mechanism 21 and the second-stage transmission mechanism 22 are each connected with the preceding-stage transmission input mechanism 23 so as to be connectable to the engine 10 through the preceding-stage transmission input mechanism 23.

The front stage shift input mechanism 23 may include a plurality of front stage shift input gears 231.

The plurality of front stage transmission input gears 231 may mesh with the plurality of first front stage transmission gears 211 and the plurality of second front stage transmission gears 221, respectively. Accordingly, the plurality of front stage transmission input gears 231 can be rotated by the drive transmitted from the engine 10, and the plurality of first front stage transmission gears 211 and the plurality of second front stage transmission gears 221 can be rotated. The plurality of backing stage shift input gears 231 may be coupled to a backing stage shift input shaft 232. The front stage transmission input shaft 232 is rotatable by the drive transmitted from the engine 10 and rotates the plurality of front stage transmission input gears 231. The pre-stage shift input shaft 232 may be disposed in parallel with respect to the first axial direction (X-axis direction). The plurality of front stage shift input gears 231 may be arranged to be spaced apart from each other along the first axis direction (X axis direction).

The plurality of front stage shift input gears 231 may be formed to have different diameters. Therefore, it is possible to achieve shifting in the process of transmitting drive from the plurality of the preceding stage transmission input gears 231 to the plurality of the first preceding stage transmission gears 211 and the plurality of the second preceding stage transmission gears 221.

One side of each of the front stage transmission input gears 231 may be meshed with any one of the first front stage transmission gears 211, and the other side may be meshed with any one of the second front stage transmission gears 221. Thereby, the plurality of front stage transmission input gears 231 can simultaneously rotate the first front stage transmission gear 211 and the second front stage transmission gear 221.

Referring to fig. 2 and 3, the clutch part 3 is connected to the pre-stage transmission part 2 so as to selectively output the drive transmitted from the pre-stage transmission part 2. The clutch part 3 may be connected to the adjustment part 4. The clutch section 3 can selectively output the drive transmitted from the front stage transmission section 2 to the adjustment section 4.

The clutch part 3 may include a first clutch mechanism 31 and a second clutch mechanism 32.

The first clutch mechanism 31 is connected to the first-stage transmission mechanism 21 so as to selectively output the drive transmitted from the first-stage transmission mechanism 21. The first clutch mechanism 31 can selectively output the drive transmitted from the first-stage transmission mechanism 21 in a state where the first-stage transmission sleeve 212 is engaged with any one of the first-stage transmission gears 211. The first clutch mechanism 31 may be connected to the adjustment portion 4. The first clutch mechanism 31 can selectively output the drive transmitted from the first preceding stage transmission mechanism 21 to the regulator 4. The first clutch mechanism 31 may be implemented by a multi-plate clutch (Multiple Disk Clutch) that selectively outputs drive using friction.

The first clutch mechanism 31 may include a plurality of first friction members 311 and a plurality of second friction members 312.

A plurality of the first friction members 311 may be coupled to the first front stage shift shaft 213. Accordingly, the plurality of first friction members 311 can rotate together with the rotation of the first front stage shift shaft 213. The plurality of first friction members 311 may be disposed to be spaced apart from each other along the first axis direction (X axis direction).

The plurality of second friction members 312 may selectively contact the plurality of first friction members 311. A plurality of the second friction members 312 may be combined with the adjusting portion 4. When the plurality of second friction members 312 contact the first friction members 311, the plurality of second friction members 312 may be rotated together with the rotation of the plurality of first friction members 311. Accordingly, the drive transmitted from the first-stage transmission mechanism 21 can be output to the regulating portion 4 through the plurality of first friction members 311 and the plurality of second friction members 312. When a plurality of the second friction members 312 are spaced apart from the first friction member 311, the second friction members 312 do not rotate even if the first friction member 311 rotates. Therefore, the drive transmitted from the first-stage transmission mechanism 21 is not output to the adjustment portion 4.

As described above, the first clutch mechanism 31 can selectively output the drive transmitted from the first front stage shift shaft 213 according to whether the first friction member 311 and the second friction member 312 are in contact. The first clutch mechanism 31 may selectively contact the second friction member 312 with the first friction member 311 using a working fluid such as Oil (Oil). The first clutch mechanism 31 supplies or discharges a working fluid according to the speed of the agricultural work vehicle or the like, so that the second friction member 312 can be selectively brought into contact with the first friction member 311. The first clutch mechanism 31 may also supply or discharge the working fluid according to a shift operation by the driver, thereby selectively contacting the second friction member 312 to the first friction member 311.

The second clutch mechanism 32 is connected to the second pre-stage transmission mechanism 22 so as to selectively output the drive transmitted from the second pre-stage transmission mechanism 22. The second clutch mechanism 32 can selectively output the drive transmitted from the second pre-stage transmission mechanism 22 in a state where the second pre-stage transmission sleeve 222 is engaged with any one of the plurality of second pre-stage transmission gears 221. Accordingly, the first clutch mechanism 31 and the second clutch mechanism 32 can also be selectively output driven in a state where the first preceding-stage shift sleeve 212 is engaged with any one of the plurality of first preceding-stage shift gears 211 and the second preceding-stage shift sleeve 222 is engaged with any one of the plurality of second preceding-stage shift gears 221, respectively. When the first clutch mechanism 31 performs an output driving operation, the second clutch mechanism 32 performs an operation of not performing an output driving operation. In this case, the first clutch mechanism 31 becomes an output path of the drive. When the second clutch mechanism 32 performs an output driving operation, the first clutch mechanism 31 performs an operation of not performing an output driving operation. In this case, the second clutch mechanism 32 becomes an output path of the drive.

Therefore, in the transmission 1 of the agricultural work vehicle according to the present invention, in the case where both the first-stage shift sleeve 212 and the second-stage shift sleeve 222 are in the engaged state, the output path of the drive can be changed by the first clutch mechanism 31 and the second clutch mechanism 32, so that the shifting can be performed. That is, in the transmission 1 of the agricultural work vehicle according to the present invention, both the first-stage shift sleeve 212 and the second-stage shift sleeve 222 can perform shifting without going through the process of reaching the neutral state. Thus, the transmission 1 for an agricultural work vehicle according to the present invention can reduce rattle, shock, and the like generated during shifting, thereby contributing to providing a stable driving environment for a driver.

The second clutch mechanism 32 may be connected to the adjustment portion 4. The second clutch mechanism 32 can selectively output the drive transmitted from the second pre-stage transmission mechanism 22 to the regulator 4. The second clutch mechanism 32 may be implemented by a multi-plate clutch that selectively outputs drive using friction.

The second clutch mechanism 32 may include a plurality of third friction members 321 and a plurality of fourth friction members 322.

The plurality of third friction members 321 may be coupled to the second front stage shift shaft 223. Thereby, the plurality of third friction members 321 can rotate together with the rotation of the second front stage shift shaft 223. The plurality of third friction members 321 may be disposed to be spaced apart from each other along the first axis direction (X axis direction).

The fourth friction members 322 may be selectively in contact with the third friction members 321. The plurality of fourth friction members 322 may be coupled with the adjustment part 4. When the fourth friction member 322 is in contact with the third friction member 321, the fourth friction member 322 may rotate together with the rotation of the third friction member 321. Accordingly, the drive transmitted from the second preceding stage transmission mechanism 22 can be output to the regulating portion 4 via the third friction member 321 and the fourth friction member 322. When the fourth friction member 322 is spaced apart from the third friction member 321, the fourth friction member 322 does not rotate even if the third friction member 321 rotates. Therefore, the drive transmitted from the second preceding stage transmission mechanism 22 is not output to the adjustment portion 4.

As described above, the second clutch mechanism 32 can selectively output the drive transmitted from the second front stage shift shaft 223 according to whether the third friction member 321 and the fourth friction member 322 are in contact. The second clutch mechanism 32 may selectively contact the fourth friction member 322 with the third friction member 321 using a working fluid such as Oil (Oil). The second clutch mechanism 32 supplies or discharges a working fluid according to the speed of the agricultural work vehicle or the like, so that the fourth friction member 322 can be selectively brought into contact with the third friction member 321. The second clutch mechanism 32 may also supply or discharge the working fluid according to a shift operation by the driver, thereby selectively contacting the fourth friction member 322 to the third friction member 321.

Referring to fig. 3 and 5, the clutch unit 3 may be disposed at a rear end of the preceding-stage transmission unit 2 and at a front end of the adjustment unit 4 with reference to a transmission order of the drive. In this case, the clutch portion 3, the front stage transmission portion 2, and the adjustment portion 4 may be arranged as follows with reference to the first axial direction (X-axis direction).

First, as shown in fig. 3, the clutch unit 3 may be disposed between the front-stage transmission unit 2 and the adjustment unit 4 with reference to the first axial direction (X-axis direction). In this case, the first clutch mechanism 31 may be disposed between the first preceding-stage transmission mechanism 21 and the adjustment portion 4 with reference to the first axial direction (X-axis direction). The second clutch mechanism 32 may be disposed between the second preceding-stage transmission mechanism 22 and the adjustment portion 4 with reference to the first axial direction (X-axis direction).

Next, as shown in fig. 5, the preceding-stage transmission unit 2 may be disposed between the clutch unit 3 and the adjustment unit 4 with reference to the first axial direction (X-axis direction). In this case, the first preceding-stage transmission mechanism 21 may be disposed between the first clutch mechanism 31 and the adjustment portion 4 with reference to the first axial direction (X-axis direction). When the first preceding-stage transmission mechanism 21 is disposed between the first clutch mechanism 31 and the adjustment portion 4 with reference to the first axial direction (X-axis direction), a first through hole 213a may be formed in the first preceding-stage transmission shaft 213. The first pass hole 213a may be formed through the first front stage shift shaft 213. The first clutch mechanism 31 may be connected to the adjustment portion 4 by the first passage hole 213a. The second pre-shift mechanism 22 may be disposed between the second clutch mechanism 32 and the adjustment portion 4 with reference to the first axial direction (X-axis direction). When the second pre-shift mechanism 22 is disposed between the second clutch mechanism 32 and the adjustment portion 4 with reference to the first axial direction (X-axis direction), a second through hole 223a may be formed in the second pre-shift shaft 223. The second through hole 223a may be formed through the second front stage shift shaft 223. The second clutch mechanism 32 may be connected to the adjustment portion 4 by the second through hole 223a.

Referring to fig. 2 to 5, the clutch part 3 may be connected to the previous stage transmission part 2 to selectively output a drive that is speed-changed by the previous stage transmission part 2 to be speed-reduced. That is, the clutch unit 3 is disposed at the rear end of the front-stage transmission unit 2 based on the transmission order of the drive. Such an embodiment can obtain the following operational effects, as compared with the comparative example in which the clutch portion 3 is disposed at the front end of the front-stage transmission portion 2 while taking the transmission order of the drive as a reference.

First, the clutch unit 3 is disposed at the front end of the front-stage transmission unit 2 in the comparative example based on the transmission order of the drive, and therefore, the front-stage transmission unit 2 performs transmission of the drive transmitted from the clutch unit 3. In this way, in the comparative example, the clutch unit 3 selectively outputs the drive that is not decelerated by the front-stage transmission unit 2.

Then, based on the transmission order of the drive, the clutch unit 3 is disposed at the rear end of the front-stage transmission unit 2 in the embodiment, and thus, the clutch unit 3 is realized to selectively output the drive decelerated by the front-stage transmission unit 2. Thus, the embodiment achieves that the clutch portion 3 rotates at a slower speed and selectively outputs driving, as compared with the comparative example. Therefore, the embodiment can reduce the centrifugal hydraulic pressure as compared with the comparative example. In the case where the clutch unit 3 does not output drive, the embodiment can reduce not only Drag Torque (Drag Torque) generated in the clutch unit 3 but also heat generation generated in the clutch unit 3, and can improve the gear shift efficiency, as compared with the comparative example.

Referring to fig. 2 to 4, the front stage shift portion 2 and the clutch portion 3 may be implemented to perform eight-stage shift. In this case, the first preceding stage transmission mechanism 21, the second preceding stage transmission mechanism 22, the preceding stage transmission input mechanism 23, the first clutch mechanism 31, and the second clutch mechanism 32 may be implemented as follows.

First, the first pre-stage shift mechanism 21 may include: a first front stage gear 211a (hereinafter, referred to as a "first stage gear 211 a") corresponding to the first stage; a first front stage gear 211b (hereinafter, referred to as a "third stage gear 211 b") corresponding to the third stage; a first front stage gear 211c (hereinafter, referred to as a fifth stage gear 211 c) corresponding to a fifth stage; a first front stage gear 211d (hereinafter, referred to as a seventh stage gear 211 d) corresponding to the seventh stage; a first front stage shift sleeve 212a (hereinafter, referred to as a first low stage sleeve 212 a) selectively engaged with the first stage gear 211a and the third stage gear 211 b; and a first-stage shift sleeve 212b (hereinafter, referred to as "first-stage sleeve 212 b") selectively engaged with the fifth-stage gear 211c and the seventh-stage gear 211 d. When arranged in order of diameter from large to small, there may be an order of the first stage gear 211a, the third stage gear 211b, the fifth stage gear 211c, and the seventh stage gear 211 d. The first stage gear 211a, the third stage gear 211b, the fifth stage gear 211c, and the seventh stage gear 211d may be spaced apart from each other along the first axial direction (X-axis direction) and coupled to the first front stage shift shaft 213 in an idle-able manner. The first low-stage sleeve 212a and the first high-stage sleeve 212b may be combined with the first front-stage shift shaft 213 to rotate together with the first front-stage shift shaft 213.

Next, the second pre-stage shift mechanism 22 may include: a second front stage gear 221a (hereinafter, referred to as "second stage gear 221 a") corresponding to the second stage; a second front stage gear 221b (hereinafter, referred to as a "fourth stage gear 221 b") corresponding to the fourth stage; a second front stage gear 221c (hereinafter, referred to as a "sixth stage gear 221 c") corresponding to the sixth stage; a second preceding stage gear 221d (hereinafter, referred to as an "eighth stage gear 221 d") corresponding to eight stages; a second pre-stage shift sleeve 222a (hereinafter, referred to as "second low-stage sleeve 222 a") selectively engaged with the second stage gear 221a and the fourth stage gear 221 b; and a second pre-stage shift sleeve 222b (hereinafter, referred to as "second high-stage sleeve 222 b") selectively engaged with the sixth stage gear 221c and the eighth stage gear 221 d. When arranged in order of diameter from large to small, there may be an order of the second stage gear 221a, the fourth stage gear 221b, the sixth stage gear 221c, and the eighth stage gear 221 d. The second stage gear 221a, the fourth stage gear 221b, the sixth stage gear 221c, and the eighth stage gear 221d may be spaced apart from each other along the first axial direction (X-axis direction) and coupled to the second front stage shift shaft 223 in an idle-able manner. The second low-stage sleeve 222a and the second high-stage sleeve 222b may be combined with the second front-stage shift shaft 223 so as to rotate together with the second front-stage shift shaft 223. The second lower stage sleeve 222a, the second upper stage sleeve 222b, the first lower stage sleeve 212a, and the first upper stage sleeve 212b may be individually movable, respectively.

Next, the pre-stage shift input mechanism 23 may include: a first front stage shift input gear 231a meshed with the first stage gear 211a and the second stage gear 221a, respectively; a second front stage shift input gear 231b meshed with the third stage gear 211b and the fourth stage gear 221b, respectively; a third front stage shift input gear 231c meshed with the fifth stage gear 211c and the sixth stage gear 221c, respectively; and a fourth backing stage shift input gear 231d meshed with the seventh stage gear 211d and the eighth stage gear 221d, respectively. When arranged in order of diameter from large to small, there may be an order of the fourth preceding stage transmission input gear 231d, the third preceding stage transmission input gear 231c, the second preceding stage transmission input gear 231b, and the first preceding stage transmission input gear 231 a. Therefore, when drive is transmitted from the first-stage gear input 231a to the first-stage gear 211a and the second-stage gear 221, maximum deceleration can be achieved. When drive is transmitted from the fourth front stage shift input gear 231d to the seventh stage gear 211d and the eighth stage gear 221d, minimum deceleration can be achieved. The first pre-stage shift input gear 231a, the second pre-stage shift input gear 231b, the third pre-stage shift input gear 231c, and the fourth pre-stage shift input gear 231d may be arranged to be spaced apart from each other along the first axial direction (X-axis direction). The first pre-stage transmission input gear 231a, the second pre-stage transmission input gear 231b, the third pre-stage transmission input gear 231c, and the fourth pre-stage transmission input gear 231d may be coupled to the pre-stage transmission input shaft 232 so as to rotate together with the pre-stage transmission input shaft 232.

Next, the first clutch mechanism 31 may be coupled with the first front stage shift shaft 213. The first stage gear 211a may be disposed between the first low stage sleeve 212a and the first clutch mechanism 31 with reference to the first axial direction (X-axis direction). When implemented in the embodiment shown in fig. 5, the seventh stage gear 211d may be disposed between the first clutch mechanism 31 and the first advanced sleeve 212b with reference to the first axial direction (X-axis direction).

The second clutch mechanism 32 may then be coupled to the second front range shaft 223. The second stage gear 221a may be disposed between the second low stage sleeve 222a and the second clutch mechanism 32 with reference to the first axial direction (X-axis direction). When implemented in the embodiment shown in fig. 5, the eighth stage gear 221d may be disposed between the second clutch mechanism 32 and the second advanced sleeve 222b with reference to the first axial direction (X-axis direction).

As described above, the front-stage shift portion 2 and the clutch portion 3 may be implemented to perform eight-stage shift. Although not shown, the front-stage transmission unit 2 and the clutch unit 3 may be configured to perform transmission in an even number of stages such as four stages and six stages. The front-stage transmission unit 2 and the clutch unit 3 may be configured to perform transmission in odd-numbered stages such as three-stage, five-stage, seven-stage, etc.

Referring to fig. 2 to 6, the adjustment portion 4 is connected to the clutch portion 3 and the rear-stage transmission portion 5, respectively. The adjustment section 4 may transmit the drive transmitted from the clutch section 3 to the rear-stage transmission section 5.

The adjusting part 4 may include: a first adjustment mechanism 41, a second adjustment mechanism 42, and a combination mechanism 43.

The first adjustment mechanism 41 is connected to the first clutch mechanism 31. The first adjustment mechanism 41 may be connected to the first clutch mechanism 31 and the combining mechanism 43, respectively. Thus, the first regulating mechanism 41 can transmit the drive transmitted from the first clutch mechanism 31 to the combining mechanism 43.

The first adjustment mechanism 41 may include a first adjustment gear 411.

The first adjustment gear 411 rotates by the drive transmitted from the first clutch mechanism 31. The first adjustment gear 411 may be connected to the combining mechanism 43. Accordingly, the first regulation gear 411 can transmit the drive transmitted from the first clutch mechanism 31 to the combining mechanism 43.

The first adjustment gear 411 may be coupled with the first adjustment shaft 410. The first adjustment shaft 410 is coupled to the first clutch mechanism 31. When the first clutch mechanism 31 outputs the drive transmitted from the first preceding stage transmission mechanism 21, the first adjustment shaft 410 may be rotated by the drive transmitted from the first clutch mechanism 31, and the first adjustment gear 411 may be rotated. The first adjustment shaft 410 may be disposed in parallel with the first axis direction (X axis direction).

The second adjustment mechanism 42 is connected to the second clutch mechanism 32. The second adjusting mechanism 42 may be connected to the second clutch mechanism 32 and the combining mechanism 43, respectively. Thus, the second regulating mechanism 42 can transmit the drive transmitted from the second clutch mechanism 32 to the combining mechanism 43.

The second adjustment mechanism 42 may include a second adjustment gear 421.

The second regulation gear 421 rotates by the drive transmitted from the second clutch mechanism 32. The second adjusting gear 421 may be connected to the combining mechanism 43. Accordingly, the second regulation gear 421 can transmit the drive transmitted from the second clutch mechanism 32 to the combining mechanism 43.

The second adjustment gear 421 may be coupled with the second adjustment shaft 420. The second adjustment shaft 420 is coupled to the second clutch mechanism 32. When the second clutch mechanism 32 outputs the drive transmitted from the second preceding-stage transmission mechanism 22, the second regulation shaft 420 may be rotated by the drive transmitted from the second clutch mechanism 32, and the second regulation gear 421 may be rotated. The second adjustment shaft 420 may be disposed in parallel with the first axis direction (X axis direction).

The combination mechanism 43 is connected to the first adjustment mechanism 41 and the second adjustment mechanism 42. The combining mechanism 43 may be connected to the rear-stage transmission unit 5. Therefore, when the first clutch mechanism 31 performs the output driving operation, the driving of the first preceding stage transmission mechanism 21 by the gear change can be transmitted to the succeeding stage transmission unit 5 through the first clutch mechanism 31, the first adjustment mechanism 41, and the combination mechanism 43. When the second clutch mechanism 32 performs the output driving operation, the driving of the second preceding stage transmission mechanism 22 by the gear shift is transmitted to the succeeding stage transmission unit 5 via the second clutch mechanism 32, the second regulator mechanism 42, and the combining mechanism 43.

The combining mechanism 43 may be connected with the first adjusting mechanism 41 to perform shifting with a first Gear Ratio (Gear Ratio), and may be connected with the second adjusting mechanism 42 to perform shifting with a second Gear Ratio different from the first Gear Ratio. Therefore, even if the first-stage transmission mechanism 21 and the second-stage transmission mechanism 22 perform transmission at the same transmission ratio, the combining mechanism 43 can output different-speed drives according to whether the drive transmitted from the first regulation gear 411 or the drive transmitted from the second regulation gear 421. Therefore, in the transmission 1 of the agricultural work vehicle according to the present invention, even if the first-stage transmission mechanism 21 and the second-stage transmission mechanism 22 are implemented in the same form as each other, it is possible to output the drive at different speeds depending on whether the drive is transmitted to the combining mechanism 43 from the first adjustment mechanism 41 or the second adjustment mechanism 42. Therefore, in the transmission 1 of the agricultural work vehicle according to the present invention, the first-stage transmission mechanism 21 and the second-stage transmission mechanism 22 may be shared or modularized. Therefore, the transmission 1 of the agricultural work vehicle according to the present invention can improve the ease of manufacturing the first-stage transmission mechanism 21 and the second-stage transmission mechanism 22, and contribute to a reduction in manufacturing cost.

When the first-stage transmission mechanism 21 and the second-stage transmission mechanism 22 are identically implemented to each other to perform a shift at the same shift ratio, the first-stage transmission gear 211 engaged with one side of each of the front-stage transmission input gears 231 and the second-stage transmission gear 221 engaged with the other side may be formed to be identical to each other to perform a shift at the same shift ratio. For example, the shift ratio between the first-stage gear 211a and the first-stage shift input gear 231a and the shift ratio between the second-stage gear 221a and the first-stage shift input gear 231a may be implemented to be the same. The shift ratio between the third stage gear 211b and the second preceding stage shift input gear 231b and the shift ratio between the fourth stage gear 221b and the second preceding stage shift input gear 231b may be implemented to be the same. The shift ratio between the fifth-stage gear 211c and the third-stage transmission input gear 231c and the shift ratio between the sixth-stage gear 221c and the third-stage transmission input gear 231c may be implemented to be the same. The shift ratio between the seventh-stage gear 211d and the fourth-stage shift input gear 231d and the shift ratio between the eighth-stage gear 221d and the fourth-stage shift input gear 231d may be implemented to be the same. The first and second stage gears 211a and 221a, the third and fourth stage gears 211b and 221b, the fifth and sixth stage gears 211c and 221c, and the seventh and eighth stage gears 211d and 221d may be formed to be identical to each other.

The combining mechanism 43 may include a first combining gear 431.

The first combined gear 431 may be engaged with the first and second adjusting gears 411 and 421, respectively. A shift may be performed at the first gear ratio in the process of transmitting the drive from the first regulation gear 411 to the first combination gear 431. A shift may be performed in the second gear ratio in the process of transmitting the drive from the second regulation gear 421 to the first combination gear 431. The first combining gear 431 may be combined with the combining shaft 430. When the driving is transmitted from the first adjusting gear 411 or the second adjusting gear 421 to the first combining gear 431, the first combining gear 431 may rotate and rotate the combining shaft 430. Accordingly, the drive after the speed change in the first gear ratio or the second gear ratio can be output through the combination shaft 430. The combined axis 430 may be disposed in parallel with respect to the first axis direction (X axis direction).

Referring to fig. 2 to 8, the rear-stage shifting portion 5 performs shifting of the drive transmitted from the adjusting portion 4. The rear stage transmission 5 may be connected to a distribution gear 20. The rear stage transmission unit 5 may be directly connected to the distribution gear 20, or may be connected to the distribution gear 20 via a second transmission unit (not shown). The rear-stage transmission unit 5 may be implemented as a main transmission unit or a sub-transmission unit. Hereinafter, an embodiment in which the rear-stage transmission unit 5 is implemented as a sub-transmission unit will be described as an example.

The rear stage transmission 5 may include a rear stage transmission mechanism 51.

The rear-stage transmission mechanism 51 may be connected to the first adjustment mechanism 41 and the second adjustment mechanism 42 through the combination mechanism 43. Therefore, when the first clutch mechanism 31 performs an output driving operation, the rear stage shift mechanism 51 can receive the driving of the shift by the first clutch mechanism 31, the first adjustment shaft 410, the first adjustment gear 411, the first combination gear 431, and the combination shaft 430, and perform a further shift. When the second clutch mechanism 32 outputs the drive, the rear stage shift mechanism 51 can receive the drive shifted by the second front stage shift mechanism 22 through the second clutch mechanism 32, the second regulation shaft 420, the second regulation gear 421, the first combination gear 431, and the combination shaft 430, and perform further shifting. That is, the rear-stage transmission mechanism 51 can selectively receive the drive shifted by the first front-stage transmission mechanism 21 or the drive shifted by the second front-stage transmission mechanism 22 according to the operation of the clutch portion 3, and perform further shifting.

Therefore, the transmission device 1 for an agricultural work vehicle according to the present invention can be realized such that further shifting is performed by one of the rear-stage shifting mechanisms 51 for the driving in which shifting is performed by the first front-stage shifting mechanism 21 and the driving in which shifting is performed by the second front-stage shifting mechanism 22. Therefore, the transmission 1 of the agricultural work vehicle according to the present invention can improve the ease of manufacturing the rear-stage transmission 5 and can reduce the material cost of the rear-stage transmission 5, and thus can reduce the manufacturing cost of the rear-stage transmission 5, as compared with the comparative example in which the rear-stage transmission 5 includes a plurality of rear-stage transmission mechanisms.

Further, since the rotational speed (RPM) decreases and the Torque (Torque) increases as the drive is transmitted rearward based on the transmission order of the drive, the drive having the Torque larger than that of the front-stage transmission section 2 is transmitted to the rear-stage transmission section 5. Therefore, it is necessary to secure the thickness of the gear, the rigidity of the gear, and the like of the rear stage transmission section 5, and therefore the material cost increases. In this case, the transmission device 1 of the agricultural work vehicle according to the present invention is realized such that the rear-stage transmission section 5 performs further transmission using one of the rear-stage transmission mechanisms 51. Therefore, in the transmission 1 of the agricultural work vehicle according to the present invention, the entire transmission can be realized at a lower material cost and thus can be realized at a lower manufacturing cost than in the comparative example in which the front-stage transmission portion 2 is provided with one front-stage transmission mechanism and the rear-stage transmission portion 5 is provided with a plurality of rear-stage transmission mechanisms.

The rear stage shift mechanism 51 may include a rear stage input shaft 510. The rear stage input shaft 510 may be connected to the adjustment section 4. The rear-stage transmission mechanism 51 may be directly connected to the adjustment portion 4 through the rear-stage input shaft 510 and the combination shaft 430. In this case, the rear stage input shaft 510 may be connected with the combination shaft 430. The rear input shaft 510 may be directly coupled to the combination shaft 430. The rear stage transmission mechanism 51 may receive drive from the combining mechanism 43 through the rear stage input shaft 510 and the combining shaft 430. The rear stage input shaft 510 may be disposed in parallel with respect to the first axis direction (X axis direction).

Here, the rear-stage shift mechanism 51 may be implemented in various embodiments. These embodiments will be described in sequence with reference to the accompanying drawings.

< post-stage transmission mechanism 51 according to the first embodiment >)

Referring to fig. 7, a rear-stage transmission mechanism 51 according to the first embodiment may include: a plurality of rear stage transmission gears 511, a rear stage transmission member 512, a plurality of rear stage transmission gears 513, and a rear stage output shaft 514.

The plurality of rear stage transmission gears 511 are coupled to the rear stage input shaft 510 so as to be capable of idling. The rear stage shift gears 511 may be disposed apart from each other along the first axial direction (X-axis direction). A bearing (not shown) may be disposed between the rear stage transmission gear 511 and the rear stage input shaft 510. The plurality of the rear stage shift gears 511 may be formed to have different diameters.

The rear stage transmission member 512 is selectively connectable with a plurality of the rear stage transmission gears 511. The rear stage shift member 512 may be implemented by a sleeve or a hydraulic clutch. Hereinafter, as shown in fig. 7, 8, 11, 12, although an embodiment implemented by a sleeve based on the rear stage transmission member 512 is described, it is obvious to those skilled in the art to which the present invention pertains that an embodiment implemented by a hydraulic clutch is derived therefrom. The rear stage transmission member 512 may be disposed between the plurality of rear stage transmission gears 511 with reference to the first axial direction (X-axis direction). The rear stage transmission member 512 can be brought into a meshed state by meshing with any one of the plurality of rear stage transmission gears 511. The rear stage transmission member 512 may reach a neutral state by being spaced apart from all the rear stage transmission members 511. The rear stage transmission member 512 may be coupled to the rear stage input shaft 510.

The plurality of rear stage transmission gears 513 are respectively meshed with the plurality of rear stage transmission gears 511. A plurality of the rear stage transmission gears 513 may be coupled to the rear stage output shaft 514. The plurality of rear stage transmission gears 513 may be arranged to be spaced apart from each other along the first axis direction (X axis direction). A plurality of the rear stage transmission gears 513 may be formed to have different diameters.

The rear-stage output shaft 514 is arranged parallel to the first axis direction (X axis direction) and spaced apart from the rear-stage input shaft 510. A plurality of the rear stage transmission gears 513 may be coupled to the rear stage output shaft 514. The distribution gear 20 may be connected to the rear output shaft 514. When the rear stage transmission member 512 is engaged with any one of the rear stage transmission gears 511, the drive transmitted through the combination shaft 430 may be transmitted to the distribution gear 20 via the rear stage input shaft 510, the rear stage transmission member 512, any one of the plurality of rear stage transmission gears 511, any one of the plurality of rear stage transmission gears 513, and the rear stage output shaft 514.

When the rear-stage transmission mechanism 51 performs a two-stage transmission, the rear-stage transmission mechanism 51 may include: a first rear stage transmission gear 511a and a second rear stage transmission gear 511b disposed on both sides of the rear stage transmission member 512; a first rear stage transmission gear 513a meshed with the first rear stage transmission gear 511 a; and a second rear stage transmission gear 513b meshed with the second rear stage transmission gear 511 b.

When the rear stage transmission member 512 is engaged with the first rear stage transmission gear 511a, the drive transmitted through the combination shaft 430 can be transmitted to the distribution gear 20 via the rear stage input shaft 510, the rear stage transmission member 512, the first rear stage transmission gear 511a, the first rear stage transmission gear 513a, and the rear stage output shaft 514.

When the rear stage transmission member 512 is engaged with the second rear stage transmission gear 511b, the drive transmitted through the combination shaft 430 can be transmitted to the distribution gear 20 via the rear stage input shaft 510, the rear stage transmission member 512, the second rear stage transmission gear 511b, the second rear stage transmission gear 513b, and the rear stage output shaft 514.

Although not shown, the rear-stage transmission mechanism 51 according to the first embodiment may be implemented to perform a shift of three or more stages.

< post-stage transmission mechanism 51 according to the second embodiment >)

Referring to fig. 8, a rear-stage transmission mechanism 51 according to the second embodiment is different from the first embodiment described above in that a plurality of the rear-stage transmission gears 511 and the rear-stage transmission member 512 are coupled to the rear-stage output shaft 514, and a plurality of the rear-stage transmission gears 513 are coupled to the rear-stage input shaft 510.

The plurality of rear-stage transmission gears 511 may be coupled to the rear-stage output shaft 514 so as to be capable of idling. The rear stage transmission member 512 may be coupled to the rear stage output shaft 514 so as to be selectively connectable with a plurality of the rear stage transmission gears 511.

The plurality of rear stage transmission gears 513 may be engaged with the plurality of rear stage transmission gears 511, respectively. A plurality of the rear stage transmission gears 513 may be coupled to the rear stage input shaft 510. The drive transmitted through the combination shaft 430 may be transmitted from the plurality of rear stage transmission gears 513 to the plurality of rear stage transmission gears 511 after being transmitted through the rear stage input shaft 510 to the plurality of rear stage transmission gears 513. In this case, when the rear stage transmission member 512 is engaged with any one of the plurality of rear stage transmission gears 511, the rear stage transmission member 512 may transmit drive to the distribution gear 20 through the rear stage output shaft 514 while rotating. A plurality of the rear stage transmission gears 513 may be formed to have different diameters.

When the rear stage transmission member 512 is engaged with the first rear stage transmission gear 511a, the drive transmitted through the combination shaft 430 may be transmitted to the distribution gear 20 via the rear stage input shaft 510, the first rear stage transmission gear 513a, the first rear stage transmission gear 511a, the rear stage transmission member 512, and the rear stage output shaft 514.

When the rear stage transmission member 512 is engaged with the second rear stage transmission gear 511b, the drive transmitted through the combination shaft 430 may be transmitted to the distribution gear 20 via the rear stage input shaft 510, the second rear stage transmission gear 513b, the second rear stage transmission gear 511b, the rear stage transmission member 512, and the rear stage output shaft 514.

As described above, in the rear-stage transmission mechanism 51 according to the first embodiment and the rear-stage transmission mechanism 52 according to the second embodiment, a plurality of the rear-stage transmission gears 511 are idly coupled to any one of the rear-stage input shaft 510 and the rear-stage output shaft 514, the rear-stage transmission member 512 is coupled to a shaft of the rear-stage input shaft 510 and the rear-stage output shaft 514 that is coupled to the plurality of the rear-stage transmission gears 511, and a plurality of the rear-stage transmission gears 513 may be coupled to a shaft of the rear-stage input shaft 510 and the rear-stage output shaft 514 that is not coupled to the plurality of the rear-stage transmission gears 511. Although not shown, the rear-stage transmission mechanism 51 according to the second embodiment may be implemented to perform a shift of three or more stages.

Referring to fig. 9 to 12, in the transmission 1 of the agricultural work vehicle according to the present invention, the combining mechanism 43 further includes a second combining gear 432 in addition to the first combining gear 431 and the combining shaft 430.

The first combined gear 431 is connected to the first regulating mechanism 41 to perform shifting according to the first gear ratio. The first combining gear 431 may be combined with the combining shaft 430. The first combined gear 431 may be engaged with the first adjusting gear 411. When the first clutch mechanism 31 performs an output driving operation, a driving force for shifting the speed through the first adjusting gear 411 and the first combining gear 431 can be transmitted to the rear-stage transmission unit 5 through the combining shaft 430.

The second combination gear 432 is connected to the second adjustment mechanism 42 to perform shifting according to the second gear ratio. The second combining gear 432 may be combined with the combining shaft 430. The second combination gear 432 may mesh with the second adjustment gear 421. When the second clutch mechanism 32 performs an output driving operation, a driving of shifting via the second regulating gear 421 and the second combining gear 432 can be transmitted to the rear stage transmission section 5 through the combining shaft 430.

The second combined gear 432 and the first combined gear 431 may be disposed at positions spaced apart from each other. The second combination gear 432 and the first combination gear 431 may be formed to have different diameters. In this case, the second adjustment gear 421 and the first adjustment gear 411 may be formed to have different diameters.

The combination shaft 430 is rotated by a drive transmitted from any one of the first combination gear 431 and the second combination gear 432. The first and second combination gears 431 and 432 may be coupled to the combination shaft 430. The combination shaft 430 may be connected to the rear stage transmission 5.

As described above, the combining mechanism 43 is implemented to further include the second combining gear 432 in addition to the first combining gear 431 and the combining shaft 430, so that the transmission 1 of the agricultural work vehicle according to the present invention can obtain the following operational effects.

Since the first adjusting gear 411 and the second adjusting gear 412 in the transmission 1 of the agricultural work vehicle according to the present invention can also be shared or modularized, the range of implementation of sharing or modularization can be enlarged. In this case, the first and second adjustment gears 411 and 421 may be formed to have the same diameter. Therefore, the transmission 1 of the agricultural work vehicle according to the present invention can further improve the convenience of assembly, and can further reduce the manufacturing cost by reducing the material cost. On the other hand, when the first and second adjustment gears 411 and 412 are formed to have the same diameter, the difference between the first and second gear ratios may be achieved by the difference in diameter between the first and second combination gears 431 and 432.

The transmission 1 for an agricultural work vehicle according to the present invention can dispose the combination shaft 430 in the center of a transmission case (not shown) by adjusting the diameters of the first adjusting gear 411, the second adjusting gear 412, the first combination gear 431, and the second combination gear 432. In this case, as shown in fig. 13, a first diameter value, which is a sum of the diameter of the first adjusting gear 411 and the diameter of the first combining gear 431, and a second diameter value, which is a sum of the diameter of the second adjusting gear 421 and the diameter of the second combining gear 432, may be identical to each other. Accordingly, a first distance between the first adjustment shaft 410 and the combination shaft 430 and a second distance between the second adjustment shaft 420 and the combination shaft 430 may be identical to each other. Thus, the first-stage transmission mechanism 21, the second-stage transmission mechanism 22, the first clutch mechanism 31, the second clutch mechanism 32, the first adjustment mechanism 41, the second adjustment mechanism 42, and the combining mechanism 43 can realize an arrangement capable of improving the overall balance inside the transmission. Therefore, the transmission 1 for an agricultural work vehicle according to the present invention can improve the balance of the overall layout for achieving a speed change. The first distance and the second distance may each refer to the shortest distance of two axes connected in a straight line.

As shown in fig. 11, the combination shaft 430 may be connected to the rear stage transmission mechanism 51 according to the first embodiment described above. As shown in fig. 12, the combination shaft 430 may be connected to the rear stage shift mechanism 51 according to the second embodiment described above. The rear-stage transmission mechanism 51 according to the first and second embodiments may be implemented such that the rear-stage input shaft 510 is directly coupled to the combination shaft 430.

Referring to fig. 14 to 17, a transmission 1 of an agricultural work vehicle according to a modified embodiment of the present invention may include a transmission portion 6. Unlike the form in which the regulating portion 4 is directly connected to the rear-stage transmission mechanism 51 in the above-described transmission device 1 for an agricultural work vehicle according to the present invention, the transmission device 1 for an agricultural work vehicle according to the modified embodiment of the present invention may be implemented such that the regulating portion 4 is connected to the rear-stage transmission mechanism 51 through the transmission portion 6.

The transmission 6 may be connected to the combining mechanism 43 and the rear-stage transmission mechanism 51, respectively. Accordingly, the transmission portion 6 can receive the drive from the combining mechanism 43 and can transmit the drive to the rear-stage transmission mechanism 51. The transmission 6 may be connected to the rear-stage transmission mechanism 51 by being connected to the rear-stage input shaft 510. The transmission part 6 may be connected to the combining mechanism 43 by being connected to the combining shaft 430. The transmission portion 6 may be disposed between the combining mechanism 43 and the rear-stage transmission mechanism 51.

The transmission part 6 may include a transmission output gear 61 and a transmission input gear 62.

The transmission output gear 61 is connected to the rear-stage transmission mechanism 51. The transmission output gear 61 may be coupled to the rear stage input shaft 510. Accordingly, the transmission output gear 61 may be connected to the rear-stage transmission mechanism 51 through the rear-stage input shaft 510.

The transmission input gear 62 is connected to the combining mechanism 43. The drive input gear 62 may be coupled to the combination shaft 430. Thus, the transmission input gear 62 may be connected to the combining mechanism 43 through the combining shaft 430. Thus, the transmission input gear 62 may be connected with the adjustment portion 4. The transmission input gear 62 may mesh with the transmission output gear 61. Accordingly, the drive transmitted through the combination shaft 430 can be transmitted to the rear-stage transmission mechanism 51 through the transmission input gear 62 and the transmission output gear 61 and through the rear-stage input shaft 510. Further shifting may also be performed in accordance with the gear ratio between the transmission input gear 56 and the transmission output gear 61 during transmission of drive from the transmission input gear 56 to the transmission output gear 61. In this case, the transmission input gear 56 and the transmission output gear 61 may be formed to have different diameters.

When the transmission part 6 is provided, as shown in fig. 14 and 15, the combining mechanism 43 may be implemented as an embodiment including only the combining shaft 430 and the first combining gear 431. In this case, the above-described rear-stage transmission mechanism 51 according to the first embodiment or the above-described rear-stage transmission mechanism 51 according to the second embodiment may be connected to the transmission portion 6.

When the transmission part 6 is provided, as shown in fig. 16 and 17, the combining mechanism 43 may be implemented as an embodiment including the combining shaft 430, the first combining gear 431, and the second combining gear 432. In this case, the above-described rear-stage transmission mechanism 51 according to the first embodiment or the above-described rear-stage transmission mechanism 51 according to the second embodiment may be connected to the transmission portion 6.

The present invention described above is not limited to the foregoing embodiments and the accompanying drawings, and it should be apparent to those skilled in the art that various substitutions, modifications and alterations can be made without departing from the technical spirit of the present invention.

Claims

1. A transmission for an agricultural work vehicle, comprising:

a front-stage transmission unit that performs transmission of a drive transmitted from an engine of an agricultural work vehicle;

A clutch section connected to the preceding-stage transmission section to selectively output the drive transmitted from the preceding-stage transmission section;

an adjustment unit connected to the clutch unit; and

a rear-stage shifting portion connected to the adjusting portion to perform shifting of the drive transmitted from the adjusting portion,

the power of the engine is transmitted to the rear-stage transmission section through the front-stage transmission section, the clutch section, and the adjustment section in this order,

the front stage transmission section includes:

a first preceding-stage transmission mechanism that performs a transmission on a drive transmitted from the engine; and

a second front-stage transmission mechanism that performs a transmission of drive transmitted from the engine,

the clutch section includes:

a first clutch mechanism connected with the first preceding-stage transmission mechanism to selectively output drive transmitted thereto from the first preceding-stage transmission mechanism; and

a second clutch mechanism connected with the second preceding-stage transmission mechanism to selectively output the drive transmitted from the second preceding-stage transmission mechanism,

the adjusting section includes:

the first adjusting mechanism is connected with the first clutch mechanism;

the second adjusting mechanism is connected with the second clutch mechanism; and

The combined mechanism is connected with the first adjusting mechanism and the second adjusting mechanism,

the rear-stage transmission section includes a rear-stage transmission mechanism connected to the combining mechanism,

the front-stage transmission portion includes a front-stage transmission input mechanism that transmits the drive transmitted from the engine to the first front-stage transmission mechanism and the second front-stage transmission mechanism, respectively,

the front stage transmission input mechanism comprises a plurality of front stage transmission input gears which are respectively meshed with a plurality of first front stage transmission gears in the first front stage transmission mechanism and a plurality of second front stage transmission gears in the second front stage transmission mechanism,

the first preceding stage transmission gear engaged with one side of each of the plurality of preceding stage transmission input gears and the second preceding stage transmission gear engaged with the other side are formed to be identical to each other, so that shifting is performed at the same shifting ratio,

the combining mechanism is connected with the first adjusting mechanism to perform shifting in a first gear ratio, and with the second adjusting mechanism to perform shifting in a second gear ratio different from the first gear ratio,

The first adjusting mechanism includes a first adjusting gear rotated by the drive transmitted from the first clutch mechanism and a first adjusting shaft coupled to the first adjusting gear,

the second adjusting mechanism includes a second adjusting gear rotated by the drive transmitted from the second clutch mechanism and a second adjusting shaft coupled to the second adjusting gear,

the combination mechanism comprises:

a first combination gear engaged with the first regulation gear to perform a gear change in the first gear ratio;

a second combination gear engaged with the second regulating gear to perform a gear change in the second gear ratio; and

a combination shaft coupled with the first combination gear and the second combination gear and rotated by a drive transmitted from any one of the first combination gear and the second combination gear,

a first diameter value as a sum of the diameter of the first adjusting gear and the diameter of the first combining gear and a second diameter value as a sum of the diameter of the second adjusting gear and the diameter of the second combining gear are identical to each other.

2. The agricultural work vehicle transmission of claim 1, wherein,

The front stage transmission input mechanism includes a front stage transmission input shaft that rotates with the drive transmitted from the engine and rotates a plurality of the front stage transmission input gears, thereby rotating the plurality of first front stage transmission gears and the plurality of second front stage transmission gears through the plurality of front stage transmission input gears.

3. The agricultural work vehicle transmission of claim 1, wherein,

the rear-stage transmission mechanism includes a rear-stage input shaft connected to the adjustment portion,

the rear stage input shaft is directly coupled with the combined shaft.

4. The agricultural work vehicle transmission of claim 1, wherein,

comprises a transmission part, wherein the transmission part is connected with the adjusting part and the rear-stage speed-changing mechanism,

the transmission part includes:

the transmission output gear is connected with the rear-stage gear shifting mechanism; and

a transmission input gear meshed with the transmission output gear and connected with the adjusting part,

the rear-stage gear shifting mechanism comprises a rear-stage input shaft which is connected with the transmission part,

the transmission output gear is combined with the rear-stage input shaft,

The drive input gear is coupled to the compound shaft.

5. The agricultural work vehicle transmission of claim 1, wherein,

the rear-stage transmission mechanism includes:

a rear-stage input shaft and a rear-stage output shaft arranged to be spaced apart from each other;

a plurality of rear-stage transmission gears coupled to one of the rear-stage input shaft and the rear-stage output shaft so as to be capable of idling;

a rear-stage transmission member coupled to a shaft coupled to a plurality of the rear-stage transmission gears among the rear-stage input shaft and the rear-stage output shaft, and selectively connected to the plurality of rear-stage transmission gears; and

and a plurality of rear stage transmission gears coupled to the remaining shafts of the rear stage input shaft and the rear stage output shaft excluding the shaft to which the plurality of rear stage transmission gears are coupled, and configured to mesh with the rear stage transmission gears.