CN113473837A

CN113473837A - Speed change device for agricultural working vehicle

Info

Publication number: CN113473837A
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 America Creation Co ltd
Current assignee: Ls America Creation Co ltd
Priority date: 2019-03-20
Filing date: 2020-03-19
Publication date: 2021-10-01
Anticipated expiration: 2040-03-19
Also published as: CN113473837B

Abstract

The present invention relates to a transmission device for agricultural use industrial vehicles, comprising: a front stage transmission unit that performs a transmission of a drive transmitted from an engine of an agricultural utility vehicle; a clutch portion connected with the forward stage transmission portion to selectively output the drive transmitted thereto from the forward stage transmission portion; an adjustment section connected to the clutch section; and a rear stage shift portion connected with the adjusting portion to perform shifting of the drive transmitted thereto from the adjusting portion, the adjusting portion including: a first adjustment mechanism connected with a first clutch mechanism in the clutch section; a second adjustment mechanism connected with a second clutch mechanism in the clutch section; and a combination mechanism connected to both the first adjustment mechanism and the second adjustment mechanism, the rear shift portion including one rear shift mechanism connected to the combination mechanism.

Description

Speed change device for agricultural working vehicle

Technical Field

The present invention relates to a transmission device for agricultural utility vehicles for adjusting the speed of the agricultural utility vehicles.

Background

An agricultural work vehicle is a vehicle for utilizing land to grow crops required for human life. For example, a Combine (Combine), a Tractor (Tractor), a rice transplanter, and the like are agricultural vehicles. The combine harvester performs an operation of harvesting and threshing crops such as rice, barley, wheat, soybeans, and the like. Tractors use tractive effort to perform the work required to grow crops. The seedling transplanter performs an operation of transplanting the seedlings grown in the seedbed or the seedling box to the paddy field.

Such agricultural utility vehicles include transmissions 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 related art.

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

The primary shift 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 transmission gear 112, the second transmission gear 113, and the first sleeve 114 are coupled to the first drive shaft 111.

The first transmission gear 112 and the second transmission gear 113 are coupled to the first drive shaft 111 in an idle-able manner. 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 ratio gear 112 and the second ratio gear 113, the first sleeve 114 is in a neutral state. When the first sleeve 114 is engaged with the first transmission gear 112 or engaged with the second transmission gear 113, the first sleeve 114 is in an engaged state.

The third speed change gear 116, the fourth speed change 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 change gear 116 and the fourth speed change gear 117 are coupled to the second drive shaft 115 so as to be able to idle. 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 change gear 116 and the fourth speed change 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 both the third speed gear 116 and the fourth speed gear 117, the second sleeve 118 is in a neutral state. When the second sleeve 118 is engaged with the third speed gear 116 or with the fourth speed gear 117, the second sleeve 118 is in an engaged state.

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

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 thereof is to provide a transmission device for an agricultural work vehicle, which can reduce rattling, impact, and the like generated during a transmission process.

Means for solving the problems

In order to solve the above problems, the present invention may include the following configurations.

The transmission device for an agricultural work vehicle according to the present invention may include: a front stage transmission unit that performs a transmission of a drive transmitted from an engine of an agricultural utility vehicle; a clutch portion connected with the forward stage transmission portion to selectively output the drive transmitted thereto from the forward stage transmission portion; an adjustment section connected to the clutch section; and a rear-stage speed change portion connected with the adjustment portion to perform speed change of the drive transmitted from the adjustment portion. The pre-stage shift portion may include: a first forward stage transmission mechanism that performs a gear shift of the drive transmitted from the engine; and a second forward stage transmission mechanism that shifts the drive transmitted from the engine. The clutch portion may include: a first clutch mechanism connected with the first forward speed change mechanism to selectively output the drive transmitted from the first forward speed change mechanism; a second clutch mechanism connected with the second forward stage transmission mechanism to selectively output the drive transmitted from the second forward 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 adjustment mechanism and the second adjustment mechanism. The rear stage shift portion may include one rear stage shift 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 gear shifting to be performed using one rear gear shifting mechanism for driving the gear shifting by the front gear shifting portion, thereby enabling to improve the ease of manufacturing the rear gear shifting portion and to contribute to a reduction in the cost of manufacturing the rear gear shifting portion.

The present invention realizes that the sleeve can perform speed change even without going through a neutral state, and can reduce the shaking, impact, etc. occurring during the speed change, and thus can contribute to providing a stable driving environment for the driver.

The present invention realizes that a first preceding stage transmission mechanism and a second preceding stage transmission mechanism can be shared or modularized, thereby improving the manufacturing ease of the first preceding stage transmission mechanism and the second preceding stage transmission mechanism, and contributing to reducing the cost for manufacturing the first preceding stage transmission mechanism and the second preceding stage transmission mechanism.

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 diagrams of the transmission of the agricultural work vehicle according to the present invention.

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

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

Detailed Description

Next, an embodiment of the transmission of an agricultural vehicle according to the present invention will be described in detail with reference to the drawings.

Referring to fig. 2, 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, and a rice transplanter. 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 necessary for driving transmitted from an engine 10 of the agricultural work vehicle. The transmission device 1 of the agricultural work vehicle according to the present invention may include a forward stage transmission portion 2, a clutch portion 3, an adjustment portion 4, and a backward stage transmission portion 5.

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

The forward speed changing portion 2 may include a first forward speed changing mechanism 21 and a second forward speed changing mechanism 22.

The first front stage transmission mechanism 21 performs a shift of the drive transmitted from the engine 10. The first forward 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 forward stage transmission mechanism 21.

The first forward speed change mechanism 21 may include a plurality of first forward speed change gears 211 and a first forward speed change sleeve 212.

The first front stage transmission gear 211 is rotated by the drive transmitted from the engine 10. The first forward speed change gear 211 can be coupled to the first forward speed change shaft 213 in an idling manner. Bearings (not shown) may be provided between the plurality of first forward speed gears 211 and the first forward speed shaft 213. The plurality of first front stage speed change gears 211 may be arranged to be spaced apart from each other in the first axial direction (X-axis direction). The first axial direction (X-axis direction) is an axial direction parallel to the first forward stage shift shaft 213. The plurality of first front stage speed change gears 211 may be formed to have different diameters.

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

The first forward speed changing mechanism 21 may further include a plurality of first forward speed changing sleeves 212 according to the number of speed changing steps that the forward speed changing portion 2 can perform. In this case, the first forward stage transmission sleeve 212 may be selectively meshed with the first forward stage transmission gears 211 disposed on both sides, respectively. The first forward stage transmission sleeve 212 may be selectively engaged with the first forward stage transmission gear 211 disposed on one side. In the case where the first forward stage shift sleeve 212 is provided in plural numbers, the plural first forward stage shift sleeves 212 may be individually moved.

The second forward stage shifting mechanism 22 performs shifting of the drive transmitted from the engine 10. The second forward stage shifting 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 forward stage transmission mechanism 22.

The second forward speed change mechanism 22 may include a plurality of second forward speed change gears 221 and a second forward speed change sleeve 222.

The second front stage transmission gear 221 is rotated by the drive transmitted from the engine 10. The second forward speed change gear 221 may be coupled to the second forward speed change shaft 223 in an idling manner. Bearings (not shown) may be provided between the plurality of second forward speed change gears 221 and the second forward speed change shaft 223. The second front stage transmission shaft 233 may be arranged in parallel with the first axial direction (X-axis direction). The plurality of second front stage speed change gears 221 may be arranged to be spaced apart from each other in the first axial direction (X-axis direction). The plurality of second front stage speed change gears 221 may be formed to have different diameters.

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

The second forward speed changing mechanism 22 may further include a plurality of second forward speed changing sleeves 222 according to the number of speed changing steps that the forward speed changing portion 2 can perform. In this case, the second forward speed sleeve 222 may selectively mesh with the second forward speed gear 221 disposed on both sides, respectively. The second forward speed shift sleeves 222 may be selectively engaged with the second forward speed shift gears 221 disposed on one side. In the case where the second forward speed shift sleeve 222 is provided in plural, the plural second forward speed shift sleeves 222 may be moved individually.

Referring to fig. 2 and 3, the forward shifting portion 2 can include a forward shifting input mechanism 23.

The forward shift input mechanism 23 transmits the drive transmitted from the engine 10 to the first forward shift mechanism 21 and the second forward shift mechanism 22, respectively. The first forward speed change mechanism 21 and the second forward speed change mechanism 22 are each connected to the forward speed change input mechanism 23 so as to be connectable to the engine 10 through the forward speed change input mechanism 23.

The forward range input mechanism 23 may include a plurality of forward range input gears 231.

The plurality of forward speed change input gears 231 may be meshed with the plurality of first forward speed change gears 211 and the plurality of second forward speed change gears 221, respectively. Therefore, the plurality of forward speed change input gears 231 can be rotated by the drive transmitted from the engine 10, and the plurality of first forward speed change gears 211 and the plurality of second forward speed change gears 221 are rotated. The plurality of forward stage shift input gears 231 may be coupled with a forward stage shift input shaft 232. The forward speed change input shaft 232 is rotatable by the drive transmitted from the engine 10, and rotates the plurality of forward speed change input gears 231. The forward stage shift input shaft 232 may be arranged in parallel with 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 axial direction (X-axis direction).

The plurality of forward stage shift input gears 231 may be formed to have different diameters. Therefore, gear shifting can be achieved while transmitting drive from the plurality of forward speed change input gears 231 to the plurality of first forward speed change gears 211 and the plurality of second forward speed change gears 221.

One side of each of the forward speed change input gears 231 may be engaged with any one of the first forward speed change gears 211, and the other side may be engaged with any one of the second forward speed change gears 221. Thus, the plurality of forward speed change input gears 231 can rotate the first forward speed change gear 211 and the second forward speed change gear 221 simultaneously.

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

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

The first clutch mechanism 31 is connected to the first forward speed change mechanism 21 so as to selectively output the drive transmitted from the first forward speed change mechanism 21. The first clutch mechanism 31 can selectively output the drive transmitted from the first forward speed change mechanism 21 in a state where the first forward speed change sleeve 212 is engaged with either one of the first forward speed change 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 forward stage transmission mechanism 21 to the adjusting portion 4. The first Clutch mechanism 31 may be realized by a Multiple Disk 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. Therefore, 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 arranged to be spaced apart from each other along the first axial 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 adjustment part 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. Therefore, the drive transmitted from the first front stage transmission mechanism 21 can be output to the adjusting portion 4 through the plurality of first friction members 311 and the plurality of second friction members 312. When the plurality of second friction members 312 are spaced apart from the first friction member 311, the second friction member 312 does not rotate even though the first friction member 311 rotates. Therefore, the drive transmitted from the first front 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 or not 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 to the first friction member 311 using a working fluid such as Oil (Oil). The first clutch mechanism 31 can selectively bring the second friction member 312 into contact with the first friction member 311 by supplying or discharging a working fluid in accordance with the speed of the agricultural work vehicle or the like. The first clutch mechanism 31 may also supply or discharge the working fluid in accordance with the driver's gear shift operation, thereby selectively contacting the second friction member 312 to the first friction member 311.

The second clutch mechanism 32 is connected to the second forward speed change mechanism 22 so as to selectively output the drive transmitted from the second forward speed change mechanism 22. The second clutch mechanism 32 can selectively output the drive transmitted from the second forward speed change mechanism 22 in a state where the second forward speed change sleeve 222 is engaged with any one of the plurality of second forward speed change gears 221. Therefore, in a state where the first forward speed shift sleeve 212 is engaged with any one of the plurality of first forward speed shift gears 211 and the second forward speed shift sleeve 222 is engaged with any one of the plurality of second forward speed shift gears 221, the first clutch mechanism 31 and the second clutch mechanism 32 may be selectively driven. When the first clutch mechanism 31 performs the output drive operation, the second clutch mechanism 32 performs the output drive non-operation. In this case, the first clutch mechanism 31 serves as an output path for driving. When the second clutch mechanism 32 performs the output drive operation, the first clutch mechanism 31 performs the output drive non-operation. In this case, the second clutch mechanism 32 serves as an output path for driving.

Therefore, in the transmission 1 of the agricultural work vehicle according to the present invention, even when both the first forward speed shift sleeve 212 and the second forward speed 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, and the gear shift can be executed. That is, in the transmission 1 of the agricultural work vehicle according to the present invention, the first forward speed sleeve 212 and the second forward speed sleeve 222 can perform the speed change without going through the process of reaching the neutral state. Thus, the transmission device 1 for agricultural work vehicles according to the present invention can reduce rattling, shocks, and the like generated during shifting, and thus contribute to providing a stable driving environment to 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 forward stage shifting mechanism 22 to the adjusting portion 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. Thus, the plurality of third friction members 321 can rotate together with the rotation of the second front stage transmission shaft 223. The plurality of third friction members 321 may be arranged to be spaced apart from each other along the first axial direction (X-axis direction).

The plurality of fourth friction members 322 may selectively contact the plurality of third friction members 321. The plurality of fourth friction members 322 may be combined 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 be rotated together with the rotation of the third friction member 321. Therefore, the drive transmitted from the second front stage transmission mechanism 22 can be output to the adjusting 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 forward 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 or not. The second clutch mechanism 32 may selectively contact the fourth friction member 322 to the third friction member 321 using a working fluid such as Oil (Oil). The second clutch mechanism 32 can selectively contact the fourth friction member 322 with the third friction member 321 by supplying or discharging working fluid according to the speed of the agricultural work vehicle or the like. The second clutch mechanism 32 may also supply or discharge the working fluid according to the driver's gear shift operation, thereby selectively contacting the fourth friction member 322 to the third friction member 321.

Referring to fig. 3 and 5, the clutch portion 3 may be disposed at a rear end of the forward stage transmission portion 2 and a front end of the adjusting portion 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 portion 3 may be disposed between the forward stage transmission portion 2 and the adjustment portion 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 forward 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 forward stage shift mechanism 22 and the adjustment portion 4 with reference to the first axial direction (X-axis direction).

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

Referring to fig. 2 to 5, the clutch portion 3 may be connected to the forward stage transmission portion 2 so as to selectively output the drive that is shifted by the forward stage transmission portion 2 and decelerated. That is, the clutch portion 3 is disposed at the rear end of the front stage transmission portion 2 with reference to the order of transmission of drive. Compared with the comparative example in which the clutch portion 3 is disposed at the front end of the front stage transmission portion 2 with reference to the transmission order of the drive, the following operational effects can be obtained with this embodiment.

First, since the clutch unit 3 is disposed at the front end of the forward shifting portion 2 in the comparative example based on the order of transmission of the drive, the forward shifting portion 2 shifts the drive transmitted from the clutch unit 3. In this way, in the comparative example, the clutch portion 3 selectively outputs the drive without the speed reduction of the front stage transmission portion 2.

Then, in the embodiment, the clutch portion 3 is disposed at the rear end of the forward speed shift portion 2 based on the order of transmission of the drive, and therefore, it is realized that the clutch portion 3 selectively outputs the drive decelerated by the forward speed shift portion 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 embodiment, when the clutch unit 3 is not driven, not only the Drag Torque (dragtorque) generated in the clutch unit 3 but also the heat generation generated in the clutch unit 3 can be reduced, which can improve the gear shift efficiency, as compared with the comparative example.

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

First, the first forward stage shift mechanism 21 may include: a first front stage transmission gear 211a (hereinafter, referred to as "first stage gear 211 a") corresponding to a first stage; a first front stage transmission gear 211b (hereinafter, referred to as "third stage gear 211 b") corresponding to the third stage; a first front stage transmission gear 211c (hereinafter referred to as a fifth stage gear 211c) corresponding to a fifth stage; a first front stage transmission gear 211d (hereinafter referred to as a seventh stage gear 211d) corresponding to a seventh stage; a first front stage transmission sleeve 212a (hereinafter, referred to as a first low stage sleeve 212a) that selectively meshes with the first stage gear 211a and the third stage gear 211 b; and a first pre-stage transmission sleeve 212b (hereinafter, referred to as "first high-stage sleeve 212 b") that selectively meshes with the fifth stage gear 211c and the seventh stage gear 211 d. When arranged in order of a large diameter to a small diameter, the first stage gear 211a, the third stage gear 211b, the fifth stage gear 211c, and the seventh stage gear 211d may be arranged in this order. 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 in the first axial direction (X-axis direction) and coupled to the first pre-stage shift shaft 213 in an idling manner. The first low stage sleeve 212a and the first high stage sleeve 212b may be coupled to the first forward stage shift shaft 213 for rotation with the first forward stage shift shaft 213.

Next, the second forward stage shifting mechanism 22 may include: a second front stage speed change gear 221a (hereinafter, referred to as "second stage gear 221 a") corresponding to the second stage; a second front stage speed change gear 221b (hereinafter referred to as "fourth stage gear 221 b") corresponding to a fourth stage; a second front stage speed change gear 221c (hereinafter, referred to as "sixth stage gear 221 c") corresponding to a sixth stage; a second front stage speed change gear 221d (hereinafter, referred to as "eighth stage gear 221 d") corresponding to eight stages; a second pre-stage transmission sleeve 222a (hereinafter, referred to as "second low stage sleeve 222 a") that selectively meshes with the second stage gear 221a and the fourth stage gear 221 b; and a second pre-stage transmission sleeve 222b (hereinafter, referred to as "second high-stage sleeve 222 b") that selectively meshes with the sixth stage gear 221c and the eighth stage gear 221 d. When arranged in order of the diameter from large to small, the second stage gear 221a, the fourth stage gear 221b, the sixth stage gear 221c, and the eighth stage gear 221d may be arranged in this order. 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 in the first axial direction (X-axis direction) and be coupled to the second front stage shift shaft 223 in an idling manner. The second low stage sleeve 222a and the second high stage sleeve 222b may be coupled to the second forward shift shaft 223 to rotate with the second forward shift shaft 223. The second low-stage sleeve 222a, the second high-stage sleeve 222b, the first low-stage sleeve 212a, and the first high-stage sleeve 212b may be individually movable, respectively.

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

Next, the first clutch mechanism 31 may be coupled to the first forward speed change 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 the embodiment shown in fig. 5 is implemented, the seventh stage gear 211d may be disposed between the first clutch mechanism 31 and the first stage sleeve 212b with reference to the first axial direction (X-axis direction).

The second clutch mechanism 32 may then be coupled to the second forward speed change 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). In the embodiment shown in fig. 5, the eighth stage gear 221d may be disposed between the second clutch mechanism 32 and the second high stage sleeve 222b with reference to the first axis direction (X axis direction).

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

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

The adjusting portion 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. Therefore, the first adjustment 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 is rotated by the drive transmitted from the first clutch mechanism 31. The first adjustment gear 411 may be connected to the combining mechanism 43. Therefore, the first regulation gear 411 can transmit the drive transmitted from the first clutch mechanism 31 to the combining mechanism 43.

The first adjusting gear 411 may be combined with the first adjusting shaft 410. The first adjusting shaft 410 is coupled to the first clutch mechanism 31. When the first clutch mechanism 31 outputs the drive transmitted from the first forward 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 parallel to the first axis direction (X axis direction).

The second adjustment mechanism 42 is connected to the second clutch mechanism 32. The second adjustment mechanism 42 may be connected with the second clutch mechanism 32 and the combining mechanism 43, respectively. Therefore, the second adjustment 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 adjustment gear 421 is rotated by the drive transmitted from the second clutch mechanism 32. The second regulation gear 421 may be connected to the combining mechanism 43. Therefore, the second regulation gear 421 can transmit the drive transmitted from the second clutch mechanism 32 to the combining mechanism 43.

The second regulation gear 421 may be combined with the second regulation 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 pre-stage shift mechanism 22, the second adjustment shaft 420 may be rotated by the drive transmitted from the second clutch mechanism 32, and may rotate the second adjustment gear 421. The second adjustment shaft 420 may be disposed parallel to the first axis direction (X axis direction).

The combining mechanism 43 is connected to the first adjusting mechanism 41 and the second adjusting mechanism 42. The combining mechanism 43 may be connected to the rear stage transmission 5. Therefore, when the first clutch mechanism 31 performs an output driving operation, the driving performed by the first forward stage transmission mechanism 21 can be transmitted to the backward stage transmission unit 5 via the first clutch mechanism 31, the first adjustment mechanism 41, and the combining mechanism 43. When the second clutch mechanism 32 performs the output driving operation, the driving performed by the second forward stage transmission mechanism 22 may be transmitted to the backward stage transmission unit 5 via the second clutch mechanism 32, the second adjustment 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 forward speed change mechanism 21 and the second forward speed change mechanism 22 perform speed change at the same speed change ratio, the combining mechanism 43 can output drive at different speeds depending on whether the drive is transmitted from the first adjusting gear 411 or the drive is transmitted from the second adjusting gear 421. Therefore, in the transmission 1 of the agricultural work vehicle according to the present invention, even if the first forward speed change mechanism 21 and the second forward speed change mechanism 22 are implemented in the same form as each other, it is possible to output different speeds of drive 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 forward speed change mechanism 21 and the second forward speed change 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 forward speed change mechanism 21 and the second forward speed change mechanism 22, and contribute to a reduction in manufacturing cost.

When the first forward speed change mechanism 21 and the second forward speed change mechanism 22 are implemented identically to each other to perform a speed change at the same speed change ratio, the first forward speed change gear 211 engaged with one side of each of the forward speed change input gears 231 and the second forward speed change gear 221 engaged with the other side may be formed identically to each other to perform a speed change at the same speed change ratio. For example, the gear ratio between the first stage gear 211a and the first forward stage shift input gear 231a and the gear ratio between the second stage gear 221a and the first forward stage shift input gear 231a may be implemented to be the same. The gear ratio between the third stage gear 211b and the second front stage gear change input gear 231b and the gear ratio between the fourth stage gear 221b and the second front stage gear change input gear 231b may be implemented to be the same. The gear ratio between the fifth stage gear 211c and the third pre-stage shift input gear 231c and the gear ratio between the sixth stage gear 221c and the third pre-stage shift input gear 231c may be implemented to be the same. The gear ratio between the seventh stage gear 211d and the fourth pre-stage shift input gear 231d and the gear ratio between the eighth stage gear 221d and the fourth pre-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 combination gear 431 may be engaged with the first adjustment gear 411 and the second adjustment gear 421, respectively. The shifting may be performed at the first gear ratio in the process of transmitting the drive from the first adjusting gear 411 to the first combination gear 431. The shifting in the second gear ratio may be performed in the process of transmitting the drive from the second regulation gear 421 to the first combination gear 431. The first combination gear 431 may be combined with the combination shaft 430. When the driving is transmitted from the first adjusting gear 411 or the second adjusting gear 421 to the first combination gear 431, the first combination gear 431 may rotate and rotate the combination shaft 430. Therefore, the drive after the gear shift in the first gear ratio or the second gear ratio can be output through the combination shaft 430. The combination shaft 430 may be arranged in parallel with respect to the first axis direction (X-axis direction).

Referring to fig. 2 to 8, the rear shift portion 5 shifts the drive transmitted from the adjustment portion 4. The rear stage shift portion 5 may be connected with the 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 through a second transmission unit (not shown). The rear-stage transmission 5 may be implemented as a main transmission or a sub-transmission. 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 shift portion 5 may include a rear stage shift mechanism 51.

The rear stage transmission mechanism 51 may be connected to the first adjustment mechanism 41 and the second adjustment mechanism 42 via the combining mechanism 43. Therefore, when the first clutch mechanism 31 performs an output driving operation, the rear transmission mechanism 51 can receive a driving force shifted by the first front transmission mechanism 21 through 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 shifting. When the second clutch mechanism 32 outputs drive, the rear stage shift mechanism 51 can receive drive of shifting 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 transmission mechanism 51 can selectively receive the drive of the gear shift by the first front transmission mechanism 21 or the drive of the gear shift by the second front transmission mechanism 22 according to the operation of the clutch portion 3, and perform a further gear shift.

Therefore, the transmission 1 of the agricultural work vehicle according to the present invention can be realized such that the drive of the first front stage transmission mechanism 21 and the drive of the second front stage transmission mechanism 22, which have been shifted, are shifted further by one of the rear stage transmission mechanisms 51. Therefore, compared to a comparative example in which the rear-stage transmission unit 5 includes a plurality of rear-stage transmission mechanisms, the transmission device 1 for an agricultural work vehicle according to the present invention can improve the ease of manufacturing the rear-stage transmission unit 5 and can reduce the material cost of the rear-stage transmission unit 5, thereby reducing the manufacturing cost of the rear-stage transmission unit 5.

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

The rear stage transmission mechanism 51 may include a rear stage input shaft 510. The rear stage input shaft 510 may be connected to the adjustment portion 4. The rear stage transmission mechanism 51 may be directly connected to the adjusting portion 4 via 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 combined shaft 430. The rear stage input shaft 510 may also be directly coupled to the combination shaft 430. The rear stage transmission mechanism 51 can receive drive from the combining mechanism 43 via the rear stage input shaft 510 and the combining shaft 430. The rear stage input shaft 510 may be arranged in parallel with the first axis direction (X axis direction).

Here, the rear stage transmission mechanism 51 may be implemented in various embodiments. The embodiments will be described in turn with reference to the accompanying drawings.

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

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

The plurality of rear stage speed change gears 511 are coupled to the rear stage input shaft 510 in an idling manner. The rear stage speed change gears 511 may be arranged to be spaced apart from each other in the first axis 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. A plurality of the rear stage speed change gears 511 may be formed to have different diameters.

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

The plurality of rear stage transmission gears 513 are meshed with the plurality of rear stage transmission gears 511, respectively. A plurality of the rear stage drive 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 in the first axis direction (X axis direction). The plurality of rear stage transmission gears 513 may be formed to have different diameters.

The rear stage output shaft 514 is disposed parallel to the first axial 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 stage output shaft 514. When the rear stage shift member 512 is engaged with any one of the rear stage shift gears 511, 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 shift member 512, any one of the plurality of rear stage shift gears 511, any one of the plurality of rear stage transmission gears 513, and the rear stage output shaft 514.

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

When the rear stage shift member 512 is engaged with the first rear stage shift 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 shift member 512, the first rear stage shift gear 511a, the first rear stage drive gear 513a, and the rear stage output shaft 514.

When the rear stage shift member 512 is engaged with the second rear stage shift 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 shift member 512, the second rear stage shift gear 511b, the second rear stage transmission gear 513b, and the rear stage output shaft 514.

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

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

Referring to fig. 8, the rear stage shift mechanism 51 according to the second embodiment is different from the first embodiment in that a plurality of the rear stage shift gears 511 and the rear stage shift 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 speed change gears 511 may be coupled to the rear stage output shaft 514 in an idling manner. The rear stage shift member 512 can be coupled to the rear stage output shaft 514 to selectively connect with a plurality of the rear stage shift gears 511.

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

When the rear stage shift member 512 is engaged with the first rear stage shift 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 first rear stage drive gear 513a, the first rear stage shift gear 511a, the rear stage shift member 512, and the rear stage output shaft 514.

When the rear stage shift member 512 is engaged with the second rear stage shift 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 second rear stage transmission gear 513b, the second rear stage shift gear 511b, the rear stage shift member 512, and the rear stage output shaft 514.

As described above, in the rear stage shift mechanism 51 according to the first embodiment and the rear stage shift mechanism 52 according to the second embodiment, the plurality of rear stage shift gears 511 are coupled to any one of the rear stage input shaft 510 and the rear stage output shaft 514 in an idling manner, the rear stage shift member 512 is coupled to one of the rear stage input shaft 510 and the rear stage output shaft 514 to which the plurality of rear stage shift gears 511 are coupled, and the plurality of rear stage transmission gears 513 may be coupled to one of the rear stage input shaft 510 and the rear stage output shaft 514 to which the plurality of rear stage shift gears 511 are not coupled. Although not shown, the rear-stage shift 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 combination gear 431 is connected to the first adjustment mechanism 41 to perform shifting in accordance with the first gear ratio. The first combination gear 431 may be combined with the combination shaft 430. The first combination gear 431 may be engaged with the first adjustment gear 411. When the first clutch mechanism 31 performs an output driving operation, the driving force of the gear shift via the first adjustment gear 411 and the first combination gear 431 may be transmitted to the rear gear shift unit 5 via the combination shaft 430.

The second combined gear 432 is connected to the second adjusting mechanism 42 to perform shifting in accordance with the second gear ratio. The second combination gear 432 may be coupled with the combination shaft 430. The second combination gear 432 may be engaged with the second adjustment gear 421. When the second clutch mechanism 32 performs an output driving operation, the driving force of the gear shift via the second adjustment gear 421 and the second combination gear 432 can be transmitted to the rear gear shift unit 5 via the combination shaft 430.

The second combination gear 432 and the first combination 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 regulation gear 421 and the first regulation gear 411 may be formed to have different diameters.

The combination shaft 430 is rotated by the drive transmitted from any one of the first combination gear 431 and the second combination gear 432. The first combination gear 431 and the second combination gear 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 combination mechanism 43 is implemented to include the second combination gear 432 in addition to the first combination gear 431 and the combination shaft 430, so that the transmission device 1 for an 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 device 1 for an agricultural work vehicle according to the present invention can also be shared or modularized, the shared or modularized implementation range can be expanded. In this case, the first adjusting gear 411 and the second adjusting gear 421 may be formed to have the same diameter. Therefore, according to the transmission device 1 for agricultural work vehicles of the present invention, the ease of assembly can be further improved, and the manufacturing cost can be further reduced by reducing the material cost. On the other hand, when the first adjusting gear 411 and the second adjusting gear 412 are formed to have the same diameter, the difference between the first gear ratio and the second gear ratio may be realized by the difference between the diameters of the first combination gear 431 and the second combination gear 432.

The transmission device 1 of the agricultural work vehicle according to the present invention can arrange the combination shaft 430 at the center of a transmission case (not shown) by adjusting the diameters of the first adjustment gear 411, the second adjustment 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 the sum of the diameter of the first adjusting gear 411 and the diameter of the first combination gear 431, and a second diameter value, which is the sum of the diameter of the second adjusting gear 421 and the diameter of the second combination gear 432, may be identical to each other. Accordingly, a first distance between the first adjusting shaft 410 and the combining shaft 430 and a second distance between the second adjusting shaft 420 and the combining shaft 430 may be the same as each other. Therefore, the first forward speed change mechanism 21, the second forward speed change 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 achieve an arrangement that can improve the overall balance inside the transmission. Therefore, the transmission device 1 of the agricultural work vehicle according to the present invention can improve the balance of the overall layout for achieving the speed change. The first distance and the second distance may each refer to a shortest distance of two axes connected in a straight line.

As shown in fig. 11, the combination shaft 430 may be connected with the rear shift mechanism 51 according to the first embodiment described above. As shown in fig. 12, the combination shaft 430 may be connected to the rear shift mechanism 51 according to the second embodiment described above. The rear stage shift 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, the transmission device 1 of the agricultural work vehicle according to the modified embodiment of the present invention may include a power transmission portion 6. Unlike the form in which the adjusting portion 4 is directly connected to the rear stage shift mechanism 51 in the above-described transmission device 1 of an agricultural work vehicle according to the present invention, the transmission device 1 of an agricultural work vehicle according to a modified embodiment of the present invention may be implemented such that the adjusting portion 4 is connected to the rear stage shift mechanism 51 through the power transmitting portion 6.

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

The transmission section 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 shift mechanism 51. The transmission output gear 61 may be coupled to the rear stage input shaft 510. Therefore, the transmission output gear 61 can be connected to the rear stage transmission mechanism 51 via the rear stage input shaft 510.

The transmission input gear 62 is connected to the combining mechanism 43. The transmission input gear 62 may be coupled to the combination shaft 430. Thus, the transmission input gear 62 can be connected to the combining mechanism 43 through the combining shaft 430. Therefore, the transmission input gear 62 can be connected with the adjustment portion 4. The transmission input gear 61 may be meshed with the transmission output gear 61. Therefore, 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. During the transmission of drive from the transmission input gear 56 to the transmission output gear 61, a further gear change may also be performed in accordance with the gear ratio between the transmission input gear 56 and 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 speed change mechanism 51 according to the first embodiment or the above-described rear speed change mechanism 51 according to the second embodiment may be connected to the power 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 speed change mechanism 51 according to the first embodiment or the above-described rear speed change mechanism 51 according to the second embodiment may be connected to the power transmission portion 6.

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

Claims

1. A transmission for agricultural use industrial vehicles, comprising:

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

a clutch portion connected with the forward stage transmission portion to selectively output the drive transmitted thereto from the forward stage transmission portion;

an adjustment section connected to the clutch section; and

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

the front stage transmission unit includes:

a first forward stage transmission mechanism that performs a gear shift of the drive transmitted from the engine; and

a second forward stage transmission mechanism that performs a gear shift of the drive transmitted from the engine,

the clutch portion includes:

a first clutch mechanism connected with the first forward speed change mechanism to selectively output the drive transmitted from the first forward speed change mechanism; and

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

the adjusting portion includes:

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 to both the first adjustment mechanism and the second adjustment mechanism,

the rear stage shift portion includes one rear stage shift mechanism connected to the combining mechanism.

2. The transmission of an agricultural work vehicle according to claim 1,

the combining mechanism is connected with the first adjusting mechanism to perform shifting at a first Gear Ratio (Gear Ratio), and is connected with the second adjusting mechanism to perform shifting at a second Gear Ratio different from the first Gear Ratio.

3. The transmission of an agricultural work vehicle according to claim 1,

the first adjustment mechanism includes a first adjustment gear that is rotated by the drive transmitted from the first clutch mechanism,

the second adjustment mechanism includes a second adjustment gear that is rotated by the drive transmitted from the second clutch mechanism,

the combination mechanism includes:

the first combined gear is meshed with the first adjusting gear and the second adjusting gear; and

a combination shaft coupled with the first combination gear and rotated by the drive transmitted thereto from the first combination gear.

4. The transmission of an agricultural work vehicle according to claim 3,

the rear stage transmission mechanism includes a rear stage input shaft connected to the adjusting portion, the rear stage input shaft being directly coupled to the combined shaft.

5. The transmission of an agricultural work vehicle according to claim 3,

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

the transmission portion includes: the transmission output gear is connected with the rear-stage speed change mechanism; a transmission input gear engaged with the transmission output gear and connected with the adjustment part,

the rear-stage speed change 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 transmission input gear is coupled with the combination shaft.

6. The transmission of an agricultural work vehicle according to claim 3,

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 any one of the rear stage input shaft and the rear stage output shaft in an idling manner;

a rear stage transmission member coupled to a shaft coupled with the plurality of 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 other shafts of the rear stage input shaft and the rear stage output shaft except for the shafts to which the plurality of rear stage transmission gears are coupled, and configured to mesh with the rear stage transmission gears.

7. The transmission of an agricultural work vehicle according to claim 1,

the combination mechanism includes:

a first combination gear that meshes with the first adjustment gear to perform shifting in the first gear ratio;

a second combination gear that meshes with the second adjusting gear to perform shifting in the second gear ratio; and

and a combination shaft to which the first combination gear and the second combination gear are coupled and which rotates by the drive transmitted from any one of the first combination gear and the second combination gear.

8. The transmission of an agricultural work vehicle according to claim 7,

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

the rear stage input shaft is directly coupled to the combination shaft.

9. The transmission of an agricultural work vehicle according to claim 7,

the transmission portion includes:

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

a transmission input gear engaged with the transmission output gear and connected with the adjustment part,

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

the transmission input gear is coupled with the combination shaft.

10. The transmission of an agricultural work vehicle according to claim 7,

the rear stage transmission mechanism includes:

11. The transmission of an agricultural work vehicle according to claim 7,

the first adjustment gear and the second adjustment gear are formed to have the same diameter.

12. The transmission of an agricultural work vehicle according to claim 7,

a first diameter value that is a sum of the diameter of the first regulation gear and the diameter of the first combination gear and a second diameter value that is a sum of the diameter of the second regulation gear and the diameter of the second combination gear are identical to each other.

13. The transmission of an agricultural work vehicle according to claim 1,

the first forward stage shifting mechanism and the second forward stage shifting mechanism are implemented identically to each other so as to perform shifting at the same shift ratio.

14. The transmission of an agricultural work vehicle according to claim 1,

the forward stage shift portion includes a forward stage shift input mechanism that transmits drive transmitted from the engine to the first forward stage shift mechanism and the second forward stage shift mechanism, respectively,

the forward speed change input mechanism includes a plurality of forward speed change input gears engaged with a plurality of first forward speed change gears in the first forward speed change mechanism and a plurality of second forward speed change gears in the second forward speed change mechanism, respectively,

the first forward speed change gear meshing with one side of each of the plurality of forward speed change input gears and the second forward speed change gear meshing with the other side are formed to be identical to each other so that the speed change is performed at the same speed change ratio.