combine

Abstract

Conventionally, the rotation transmitted from the input shaft to the counter shaft is returned and transmitted to the harvesting main shaft via gears for standard speed and lodging speed, which presents the problem of transmission loss. [Solution] The output rotation of the engine 22 is transmitted from the output shaft 24 of the continuously variable transmission 20 to the first shaft 29, second shaft 32 and third shaft 26 of the transmission 23 via the input shaft 25 of the transmission 23. The first shaft 29 is provided with a first gear 30 that is always meshed with the gear 27 of the input shaft 25, a second gear 43, and a clutch 48 that rotates integrally with the first shaft 29 between the first gear 30 and the second gear 43. The second shaft 32 is provided with a third gear 46 that is always meshed with the first gear 30, a fourth gear 45 that is always meshed with the second gear 43, and a fifth gear 47 that transmits rotation to the third shaft 26. The first gear 30 is provided with an engagement portion 50 that engages with the engagement portion 48A of the clutch 48, and the second gear 43 is provided with an engagement portion 51 that engages with the engagement portion 48B of the clutch 48.

Description

Technical Field

[0004] , , ,

[0001] The present invention relates to a combine harvester.

Background Art

[0002] Conventionally, the rotation of a continuously variable transmission is input to an input shaft, and the output rotation transmitted to the input shaft is transmitted to a counter shaft via the gear of the input shaft, the gear of the main cutting shaft, and the gear of the counter shaft. The configuration in which the rotation transmitted to the counter shaft is transmitted back to the standard speed gear and the lodging speed gear provided on the main cutting shaft and output to the cutting device is known (Patent Document 1). Also conventionally, a first sub-transmission gear integrally formed with a second sub-transmission gear and a third sub-transmission gear and constantly meshing with an output shaft is loosely fitted on a sub-transmission shaft so as to be axially slidable and non-rotatable relative to the shaft. A configuration in which the counter shaft is sub-transmitted at any of high speed, medium speed, and low speed by selecting the meshing of any of the first gear and the first counter gear, the second gear and the second counter gear, and the third gear and the third counter gear is known (Patent Document 2).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] [[ID=XXX]] Among the above-known examples, the former has a problem that transmission loss occurs because the rotation transmitted from the input shaft to the counter shaft is transmitted back to the standard speed gear and the lodging speed gear provided on the main cutting shaft. Among the above-known examples, the latter has a configuration of only a transmission mechanism without变速 from the output shaft to the sub-transmission shaft. When the crop is lodged, it is necessary to lower (slow down) the traveling speed and perform the cutting operation, resulting in a problem of poor work efficiency. It should be noted that the tags "XXX" in the above translation are used to represent the original text tags that are not clearly numbered in the provided content. Since the original text's tag numbering seems to be incomplete in some parts related to "

発明の概要

発明が解決しようとする課題

[0005] The invention of claim 1 is a combine harvester in which a continuously variable transmission 20 is provided downstream of the transmission path of the engine 22 to increase / decrease the output rotation of the engine 22 and switch the direction of rotation, and the output rotation of the continuously variable transmission 20 is transmitted to the running gear 2 and the harvesting gear 4 via a transmission 23, wherein the output rotation of the engine 22 is transmitted from the output shaft 24 of the continuously variable transmission 20 to the input shaft 25 of the transmission 23 to the first shaft 29, second shaft 32 and third shaft 26 of the transmission 23, and the first shaft 29 is connected to the input shaft 2 of the transmission The combine harvester is characterized by having a first gear 30 that is always meshed with gear 27, a second gear 43, and a clutch 48 that rotates integrally with the first shaft 29 between the first gear 30 and the second gear 43; the second shaft 32 is provided with a third gear 46 that is always meshed with the first gear 30, a fourth gear 45 that is always meshed with the second gear 43, and a fifth gear 47 that transmits rotation to the third shaft 26; the first gear 30 is provided with an engagement portion 50 that engages with the engagement portion 48A of the clutch 48, and the second gear 43 is provided with an engagement portion 51 that engages with the engagement portion 48B of the clutch 48. The invention of claim 2 is a combine harvester in which the variable speed rotation of the continuously variable transmission 20 is provided with two transmission paths: a direct transmission path in which the rotation is transmitted from the output shaft of the continuously variable transmission 20 via gears to the first shaft 29 and output to the harvesting device 4, and a detour transmission path in which the drive rotation transmitted indirectly to the first shaft 29 via a separately provided second shaft 32 is returned to the first shaft 29 and output to the harvesting device 4. The invention of claim 3 is a combine harvester configured such that a gear 27 provided on the output shaft 24 of the continuously variable transmission 20 is constantly meshed with a first gear 30 on a first shaft 29 provided near the output shaft 24, and the rotation of the first gear 30 is transmitted to a harvesting output pulley 31 provided on the first shaft 29 protruding from the transmission case 21 and output to the harvesting device 4 in a direct transmission path configuration; a second gear 43 is provided separately on the first shaft 29 so as to be rotatable, and a second gear 43 is provided which is rotated by transmission from a second shaft 32 provided near the first shaft 29 to form a bypass transmission path; and a clutch 48 is provided between the first gear 30 and the second gear 43 to selectively switch and transmit the rotation of either the first gear 30 or the second gear 43 to the first shaft 29, thereby switching between the direct transmission path and the bypass transmission path. The invention of claim 4 is a combine harvester in which a clutch 48 is provided on a first shaft 29 between a first gear 30 and a second gear 43, an engaging portion 50 that engages with and disengages from the engaging portion 48A of the clutch 48 is provided on the clutch 48 side of the first gear 30, and an engaging portion 51 that engages with and disengages from the engaging portion 48B of the clutch 48 is provided on the clutch 48 side of the second gear 43. The invention of claim 5 is a combine harvester in which the number of teeth of the first gear 30 is greater than the number of teeth of the second gear 43, the rotation transmitted by the first gear 30 to the first shaft 29 is set to standard speed, and the rotation transmitted by the second gear 43 to the first shaft 29 is set to high speed. The invention of claim 6 is a combine harvester in which a continuously variable transmission 20 for increasing or decreasing the output rotation speed of the engine 22 and switching the direction of rotation (forward or reverse rotation) is provided on either the left or right side of the transmission case 21 downstream of the transmission path of the engine 22, and the variable rotation speed of the continuously variable transmission 20 is provided on two transmission paths: a direct transmission path in which the rotation is transmitted from the output shaft of the continuously variable transmission 20 via gears to the first shaft 29 and output to the harvesting device 4, and a detour transmission path in which the drive rotation transmitted indirectly to the first shaft 29 via a separately provided second shaft 32 is returned to the first shaft 29 and output to the harvesting device 4. The invention of claim 7 is a combine harvester configured such that a gear 27 provided on the output shaft 24 of the continuously variable transmission 20 is constantly meshed with a first gear 30 on a first shaft 29 provided near the output shaft 24, and the rotation of the first gear 30 is transmitted to a harvesting output pulley 31 provided on the first shaft 29 protruding from the transmission case 21 and output to the harvesting device 4, in a direct transmission path configuration; a second gear 43 is provided separately on the first shaft 29 so as to be rotatable, and a second gear 43 is provided which is rotated by transmission from a second shaft 32 provided near the first shaft 29 to form a bypass transmission path; and a clutch 48 is provided between the first gear 30 and the second gear 43 to selectively switch and transmit the rotation of the first gear 30 or the second gear 43 to the first shaft 29, thereby switching between the direct transmission path and the bypass transmission path. The invention of claim 8 is a combine harvester in which a clutch 48 is provided on a first shaft 29 between a first gear 30 and a second gear 43, an engaging portion 50 that engages with and disengages from the engaging portion 48A of the clutch 48 is provided on the clutch 48 side of the first gear 30, and an engaging portion 51 that engages with and disengages from the engaging portion 48B of the clutch 48 is provided on the clutch 48 side of the second gear 43. The invention of claim 9 is a combine harvester in which the first gear 30 transmits rotation to the first shaft 29 at a standard speed, and the second gear 43 transmits rotation to the first shaft 29 at a high speed. The invention of claim 10 is a combine harvester in which the harvesting output pulley 31 is composed of a pair of pulley bodies 53, and the pulley bodies 53 of the pair of harvesting output pulleys 31 are of different diameters. The invention of claim 11 is a combine harvester configured to switch the transmission of a pair of belts 54 in the transmission path from the harvesting output pulley 31 to the harvesting device 4 using separate tension pulleys 55, and the switching of the tension pulleys 55 is performed by a lever 56 or a motor 57. [Effects of the Invention]

[0006] In the invention of claim 1, the output rotation of the engine 22 is transmitted from the output shaft 24 of the continuously variable transmission 20 to the input shaft 25 of the transmission 23, and the first shaft 29 is provided with a first gear 30 that is always meshed with the gear 27 of the input shaft 25 of the transmission, a second gear 43, and a clutch 48 that rotates integrally with the first shaft 29 between the first gear 30 and the second gear 43, and the second shaft 32 is provided with the first gear 3 The first gear 30 is provided with an engagement portion 50 that engages with the engagement portion 48A of the clutch 48, and the second gear 43 is provided with an engagement portion 51 that engages with the engagement portion 48B of the clutch 48. As a result, the output to the harvesting device 4 can be directly supplied from the first shaft 29, and while a speed transmission mechanism to the harvesting device 4 is provided, the output transmission loss is reduced, and the device can be made lighter and more compact. In the invention of claim 2, the variable speed rotation of the continuously variable transmission 20 is transmitted via two transmission paths: a direct transmission path from the output shaft of the continuously variable transmission 20 to the first shaft 29 via gears and output to the harvesting device 4; and a detour transmission path from the first shaft 29 to the first shaft 29 via a separately provided second shaft 32, where the drive rotation is returned to the first shaft 29 and output to the harvesting device 4. With this configuration, the variable speed rotation from the continuously variable transmission 20 is transmitted to the first shaft 29 via the direct transmission path and output to the harvesting device 4, thereby reducing the number of meshing gears and rotating shafts and minimizing power transmission loss. Furthermore, by transmitting the variable speed rotation of the continuously variable transmission 20 to the first shaft 29 via a second shaft 32, which is provided separately from the first shaft 29, and then via a second gear 43 through a detour transmission path, two transmission mechanisms can be provided within the transmission case 21 to transmit the rotation of the continuously variable transmission 20 to the harvesting device 4. In the invention of claim 3, a gear 27 provided on the output shaft 24 of the continuously variable transmission 20 is constantly meshed with a first gear 30 on a first shaft 29 provided near the output shaft 24, and the rotation of the first gear 30 is transmitted to a harvesting output pulley 31 provided on the first shaft 29 protruding from the transmission case 21, and output to the harvesting device 4, in a direct transmission path configuration. A second gear 43 is provided separately on the first shaft 29 so as to be rotatable, and a second gear 43 is provided which is rotated by transmission from a second shaft 32 provided near the first shaft 29, forming a bypass transmission path. A clutch 48 is provided between the first gear 30 and the second gear 43 to selectively switch and transmit the rotation of either the first gear 30 or the second gear 43 to the first shaft 29, thereby switching between the direct transmission path and the bypass transmission path. With this configuration, the clutch 48 selectively switches between the first gear 30 and the second gear 43, allowing the output to be switched between directly transmitting the variable speed rotation from the continuously variable transmission 20 to the first shaft 29 via a transmission path to the harvesting device 4, and transmitting the rotation to the first shaft 29 via a detour transmission path that transmits rotation from the second shaft 32, which is provided separately from the first shaft 29, to the second gear 43, thereby switching the output to the harvesting device 4. The output can then be transmitted to the harvesting device 4 via the harvesting output pulley 31. In the invention of claim 4, a clutch 48 is provided on the first shaft 29 between the first gear 30 and the second gear 43. An engaging portion 50 that engages with and disengages from the engaging portion 48A of the clutch 48 is provided on the clutch 48 side of the first gear 30, and an engaging portion 51 that engages with and disengages from the engaging portion 48B of the clutch 48 is provided on the clutch 48 side of the second gear 43. Therefore, when the clutch 48 is connected to the first gear 30, the clutch 48 transmits rotation to the first shaft 29, suppressing transmission loss and enabling output to the harvesting device 4. When the clutch 48 is switched and connected to the second gear 43, the rotation transmitted from the continuously variable transmission 20 to the second gear 43 can be output to the harvesting device 4, enabling output of two-speed drive rotation to the harvesting device 4. In the invention of claim 5, the number of teeth of the first gear 3 is greater than the number of teeth of the second gear 43, the rotation transmitted by the first gear 30 to the first shaft 29 is set to standard speed, and the rotation transmitted by the second gear 43 to the first shaft 29 is set to high speed. This configuration makes it possible to handle the harvesting of lodged grain stalks, while simplifying the configuration of the transmission path for the standard speed harvesting operation that is commonly used, thereby suppressing the occurrence of transmission loss and improving the durability of the transmission path. In the invention of claim 6, a continuously variable transmission 20 for increasing / decelerating the output rotation of the engine 22 and switching the direction of rotation is provided on either the left or right side of the transmission case 21 downstream of the transmission path of the engine 22, and the variable rotation of the continuously variable transmission 20 is provided on two transmission paths: a direct transmission path in which the rotation is transmitted from the output shaft of the continuously variable transmission 20 via gears to the first shaft 29 and output to the harvesting device 4, and a bypass transmission path in which the drive rotation transmitted indirectly to the first shaft 29 via a separately provided second shaft 32 is returned to the first shaft 29 and output to the harvesting device 4. Therefore, the variable speed rotation from the continuously variable transmission 20 can be transmitted directly to the first shaft 29 via a transmission path and output to the harvesting device 4, reducing the number of meshing gears and rotating shafts and minimizing transmission loss of output. Additionally, by transmitting the variable speed rotation of the continuously variable transmission 20 to the first shaft 29 via a second shaft 32, which is provided separately from the first shaft 29, and then via a second gear 43 via a detour transmission path, the rotation of the continuously variable transmission 20 can be transmitted to the harvesting device 4 within the transmission case 21 via two transmission paths. In the invention of claim 7, a gear 27 provided on the output shaft 24 of the continuously variable transmission 20 is constantly meshed with a first gear 30 on a first shaft 29 provided near the output shaft 24, and the rotation of the first gear 30 is transmitted to a harvesting output pulley 31 provided on the first shaft 29 protruding from the transmission case 21, and output to the harvesting device 4, in a direct transmission path configuration. A second gear 43 is provided separately on the first shaft 29 so as to be rotatable, and a second gear 43 is provided which is rotated by transmission from a second shaft 32 provided near the first shaft 29, forming a bypass transmission path. A clutch 48 is provided between the first gear 30 and the second gear 43 to selectively switch and transmit the rotation of either the first gear 30 or the second gear 43 to the first shaft 29, thereby switching between the direct transmission path and the bypass transmission path. This configuration allows the first gear 30 to engage with the clutch 48, transmitting the variable speed rotation from the continuously variable transmission 20 directly to the first shaft 29 via a transmission path and outputting it to the harvesting device 4. This reduces the number of meshing gears and rotating shafts, thereby minimizing power transmission loss. Alternatively, the second gear 43 can be engaged with the clutch 48, transmitting the variable speed rotation of the continuously variable transmission 20 to the first shaft 29 via a detour transmission path through the second shaft 32 (which is provided separately from the first shaft 29) and the second gear 43. As a result, the transmission case 21 allows for selective switching between two transmission paths for the rotation of the continuously variable transmission 20 to the harvesting device 4. In the invention of claim 8, a clutch 48 is provided on the first shaft 29 between the first gear 30 and the second gear 43, an engaging portion 50 that engages with and disengages from the engaging portion 48A of the clutch 48 is provided on the clutch 48 side of the first gear 30, and an engaging portion 51 that engages with and disengages from the engaging portion 48B of the clutch 48 is provided on the clutch 48 side of the second gear 43. As a result, the variable speed rotation from the continuously variable transmission 20 can be directly transmitted to the first shaft 29 via a transmission path and output to the harvesting device 4, reducing the number of meshing gears and rotating shafts and minimizing output transmission loss. Additionally, rotation can be transmitted to the first shaft 29 via a bypass transmission path that transmits rotation from a second shaft 32, which is provided separately from the first shaft 29, to a harvesting output pulley 31 and a second gear 43, which is provided separately, thereby outputting to the harvesting device 4. Thus, the rotation of the continuously variable transmission 20 can be varied and transmitted to the harvesting device 4 via two transmission paths. In the invention of claim 9, the first gear 30 transmits rotation to the first shaft 29 at a standard speed, and the second gear 43 transmits rotation to the first shaft 29 at a high speed. Therefore, when the clutch 48 is connected to the first gear 30, the clutch 48 transmits rotation to the first shaft 29, suppressing transmission loss and allowing output to the harvesting device 4. When the clutch 48 is switched and connected to the second gear 43, the rotation transmitted from the continuously variable transmission 20 to the second gear 43 can be output to the harvesting device 4, allowing a two-speed drive rotation to be output to the harvesting device 4. In the invention of claim 10, the harvesting output pulley 31 is composed of a pair of pulley bodies 53, and the pulley bodies 53 of the pair of harvesting output pulleys 31 have different diameters. As a result of miniaturizing the transmission 23, it becomes possible to arrange a double pulley, which was not possible in the conventional design, and the number of gear shifting stages increases to four. In the invention of claim 11, the transmission path from the harvesting output pulley 31 to the harvesting device 4 is configured to be switched by separate tension pulleys 55 on each of the pair of belts 54, and the switching of the tension pulleys 55 is performed by a lever 56 or a motor 57, so that the working speed of the harvesting device 4 can be appropriately changed according to the crop conditions. [Brief explanation of the drawing]

[0007] [Figure 1] Side view of a combine harvester. [Figure 2] Perspective view of the transmission. [Figure 3] A schematic front view of the same. [Figure 4] A schematic front view of the same. [Figure 5] A schematic diagram of the belt mechanism that outputs power from the transmission to the harvesting device. [Figure 6] Side view and front view of the same. [Figure 7] Diagram of another embodiment. [Best Mode for Carrying Out the Invention]

[0008] An embodiment of the present invention will be described with reference to the drawings. 1 is a machine body frame, 2 is a traveling device provided at a lower position of the machine body frame 1, 3 is a threshing device provided at an upper position of the machine body frame 1, 4 is a cutting device provided in front of the machine body frame 1, 5 is a grain tank provided at a side portion of the threshing device 3 for temporarily storing grains taken out from the threshing device 3, and 6 is a control unit. The cutting device 4 is provided with a weeding device 8 at the front, and a lifting device 9 is arranged in parallel behind the weeding device 8. 12 is a feeder chain. The traveling device 2 is configured to be able to change the traveling speed by a hydraulic continuously variable transmission (HST: Hydraulic Static Transmission) 20, and the rotation transmitted to the cutting device 4 is also shifted in synchronization with the traveling speed of the traveling device 2. That is, the rotation from the engine 22 is input to the hydraulic continuously variable transmission 20, and the rotation continuously variable by the hydraulic continuously variable transmission 20 is output to the traveling device 2 and the cutting device 4 via the transmission 23, and the cutting device 4 is driven at a working speed synchronized with the traveling speed. The transmission 23 is housed in the transmission case 21.

[0009] The hydraulic continuously variable transmission 20 is provided at the upper part of either the left or right side of the transmission 23, and the output shaft 24 of the hydraulic continuously variable transmission 20 is connected to the input shaft 25 of the transmission 23. An output gear 27 is provided on the input shaft 25. A first shaft (cutting output shaft) 29 for outputting to the cutting device 4 is provided in the vicinity of the input shaft 25, and a first gear (driven gear) 30 rotatably provided on the first shaft 29 is constantly meshed with the output gear 27. The end of the first shaft 29 protrudes outside the transmission case 21, and a cutting output pulley 31 is attached. A second gear 43 is provided separately on the first shaft 29. A second shaft (counter shaft) 32 is provided in the vicinity of the first shaft 29. A third gear (counter gear) 46 is fixed to the second shaft 32, and the third gear 46 is constantly meshed with the driven gear 30. A fourth gear 45 is provided separately on the second shaft 32, and the fourth gear 45 is constantly meshed with the second gear 43. A fifth gear 47 is provided at the intermediate position of the second shaft 32. Rotation is output to the third shaft via the fifth gear 47, and finally transmitted to a side clutch (not shown) to drive-rotate a foil shaft (not shown), driving the traveling device 2 to make the machine body travel. When one of the left and right side clutches is disengaged, the machine makes a gentle turn, and when the brake is further applied, it can make a sharp turn.

[0010] A continuously variable transmission 20 for increasing or decreasing the output rotation speed of the engine 22 and switching the rotation direction (forward and reverse rotation) is provided on the downstream side of the transmission path of the engine 22. In a combine in which the output rotation of the continuously variable transmission 20 is transmitted to the traveling device 2 and the mowing device 4 via the transmission 23, the transmission 23 transmits the output rotation of the engine 22 from the output shaft 24 of the continuously variable transmission 20 to the first shaft 29, the second shaft 32, and the third shaft 26 of the transmission 23 via the input shaft 25 of the transmission 23. The first shaft 29 is provided with a first gear 30 that always meshes with a gear 27 of the input shaft 25 of the transmission, a second gear 43, and a clutch (clutch sleeve) 48 that rotates integrally with the first shaft 29 between the first gear 30 and the second gear 43. The second shaft 32 is provided with a third gear 46 that always meshes with the first gear 30, a fourth gear 45 that always meshes with the second gear 43, and a fifth gear 47 that transmits rotation to the third shaft 26. The first gear 30 is provided with an engaging portion 50 that engages with an engaging portion 48A of the clutch 48, and the second gear 43 is provided with an engaging portion 51 that engages with an engaging portion 48B of the clutch 48.

[0011] In this case, the clutch 48 may have a configuration that switches the transmission of the rotation of the first gear 30 or the second gear 43 to the first shaft 29, and the configuration is arbitrary. For example, in the present embodiment, it is a clutch sleeve (clutch release bearing) provided with a sleeve and is configured to be axially slidable on the first shaft 29. Therefore, while having a transmission mechanism for变速 to the mowing device 4, the transmission loss of the output is small, and it can be made lightweight, compact, and the mowing output can be increased by adopting a two-stage pulley for mowing变速. In this embodiment, the first gear 30 is rotatably mounted on the first shaft 29, and when engaged with the clutch 48, the rotation of the first gear 30 is transmitted to the first shaft 29. Similarly, the second gear 43 is rotatably mounted on the first shaft 29, and when engaged with the clutch 48, the rotation of the second gear 43 is transmitted to the first shaft 29.

[0012] The variable speed rotation of the continuously variable transmission 20 is provided by two transmission paths: a direct transmission path from the output shaft of the continuously variable transmission 20 to the harvesting device 4 via gears transmitted to the first shaft 29, and a bypass transmission path from the first shaft 29 via a separately provided second shaft 32, which returns the drive rotation to the first shaft 29 and outputs it to the harvesting device 4 (Figure 4). Therefore, the variable speed rotation from the continuously variable transmission 20 can be transmitted directly to the first shaft 29 via a transmission path and output to the harvesting device 4, reducing the number of meshing gears and rotating shafts and minimizing power transmission loss. Additionally, by transmitting the variable speed rotation of the continuously variable transmission 20 to the first shaft 29 via a second shaft 32, which is provided separately from the first shaft 29, and then via a second gear 43, the rotation of the continuously variable transmission 20 can be transmitted to the harvesting device 4 via two transmission paths within the transmission case 21.

[0013] A gear 27 on the output shaft 24 of the continuously variable transmission 20 is constantly engaged with the first gear 30 on the first shaft 29 located near the output shaft 24. The rotation of the first gear 30 is transmitted to the harvesting output pulley 31 located on the first shaft 29 protruding from the transmission case 21, and output to the harvesting device 4, thus forming a direct transmission path. A second gear 43, which is rotatably mounted separately on the first shaft 29, is provided with a second gear 43 that rotates by transmission from the second shaft 32 located near the first shaft 29, forming a bypass transmission path. A clutch 48 is provided between the first gear 30 and the second gear 43 to selectively switch and transmit the rotation of either the first gear 30 or the second gear 43 to the first shaft 29, thereby switching between the direct transmission path and the bypass transmission path. Therefore, the variable speed rotation from the continuously variable transmission 20 can be directly transmitted to the first shaft 29 via a transmission path and output to the harvesting device 4, reducing the number of meshing gears and rotating shafts and minimizing power transmission loss. Additionally, rotation can be transmitted to the first shaft 29 via a bypass transmission path that transmits rotation from a second shaft 32 (which is provided separately from the first shaft 29) to a harvesting output pulley 31 and a second gear 43 (which is also provided separately), thereby outputting to the harvesting device 4. Thus, the rotation of the continuously variable transmission 20 can be varied and transmitted to the harvesting device 4 via two separate transmission paths.

[0014] In other words, in conventional configurations, all rotation of the continuously variable transmission 20 is transmitted from the first shaft 29 through the second shaft 32 back to the first shaft 29 and then to the harvesting device 4. This increases the number of meshing gears and rotating shafts, resulting in transmission losses. However, the present invention solves this problem and suppresses transmission losses. A clutch 48 is provided on a first shaft 29 between a first gear 30 and a second gear 43 so as to be able to slide freely. An engaging portion 50 is provided on the clutch 48 side of the first gear 30 to engage with and disengage from the engaging portion 48A of the clutch 48, and an engaging portion 51 is provided on the clutch 48 side of the second gear 43 to engage with and disengage from the engaging portion 48B of the clutch 48. Therefore, when the engagement portion 48A of the clutch 48 is connected to the first gear 30, rotation is transmitted from the output shaft 24 of the continuously variable transmission 20 → input shaft 25 of the transmission case 21 → gear 27 → first gear 30 → clutch 48 → first shaft 29 and output to the harvesting device 4. Also, when the clutch 48 is switched and connected to the second gear 43, the rotation transmitted from the output shaft 24 of the continuously variable transmission 20 → input shaft 25 of the transmission case 21 → gear 27 → first gear 30 → third gear 46 → second shaft 32 → fourth gear 45 → second gear 43 → clutch 48 → first shaft 29 is output to the harvesting device 4.

[0015] In other words, the first gear 30 provided on the first shaft 29 is configured to serve both as a transmission gear for transmitting the variable speed rotation of the continuously variable transmission 20 to other rotating shafts and as an input gear for transmitting rotation to the first shaft 29, thereby creating a direct transmission path, simplifying the transmission path, and suppressing transmission losses. The first gear 30 and the second gear 43 are configured such that the rotation transmitted by the first gear 30 to the first shaft 29 is the standard speed, and the rotation transmitted by the second gear 43 to the first shaft 29 is the high-speed rotation (rotation for tilting). Therefore, while being able to handle the harvesting of lodged grain stalks, the configuration of the transmission path for the commonly used standard speed harvesting operation is simplified, thereby suppressing transmission loss and improving the durability of the transmission path. A continuously variable transmission (CVT) 20, which increases or decreases the output rotation speed of the engine 22 and switches the direction of rotation (forward or reverse rotation), is provided on either the left or right side of the transmission case 21 downstream of the transmission path of the engine 22. The CVT 20 has two transmission paths: a direct transmission path in which the rotation is transmitted from the output shaft of the CVT 20 via gears to the first shaft 29 and output to the harvesting device 4; and a detour transmission path in which the drive rotation transmitted indirectly to the first shaft 29 via a separately provided second shaft 32 is returned to the first shaft 29 and output to the harvesting device 4.

[0016] Therefore, the variable speed rotation from the continuously variable transmission 20 can be transmitted directly to the first shaft 29 via a transmission path and output to the harvesting device 4, reducing the number of meshing gears and rotating shafts and minimizing power transmission loss. Additionally, by transmitting the variable speed rotation of the continuously variable transmission 20 to the first shaft 29 via a second shaft 32, which is provided separately from the first shaft 29, and then via a second gear 43, the rotation of the continuously variable transmission 20 can be transmitted to the harvesting device 4 via two transmission paths within the transmission case 21. A gear 27 on the output shaft 24 of the continuously variable transmission 20 is constantly engaged with the first gear 30 on the first shaft 29 located near the output shaft 24. The rotation of the first gear 30 is transmitted to the harvesting output pulley 31 located on the first shaft 29 protruding from the transmission case 21, and output to the harvesting device 4, thus forming a direct transmission path. A second gear 43, which is rotatably mounted separately on the first shaft 29, is provided with a second gear 43 that rotates by transmission from the second shaft 32 located near the first shaft 29, forming a bypass transmission path. A clutch 48 is provided between the first gear 30 and the second gear 43 to selectively switch and transmit the rotation of either the first gear 30 or the second gear 43 to the first shaft 29, thereby switching between the direct transmission path and the bypass transmission path.

[0017] Therefore, the variable speed rotation from the continuously variable transmission 20 can be directly transmitted to the first shaft 29 via a transmission path and output to the harvesting device 4, reducing the number of meshing gears and rotating shafts and minimizing transmission loss of output. In addition, rotation can be transmitted to the first shaft 29 via a bypass transmission path from the second shaft 32, which is provided separately from the first shaft 29, through a second gear 43, and output to the harvesting device 4. Thus, the rotation of the continuously variable transmission 20 can be varied and transmitted to the harvesting device 4 via two transmission paths. In other words, in conventional configurations, all rotation of the continuously variable transmission 20 is transmitted from the first shaft 29 through the second shaft 32 back to the first shaft 29 and then to the harvesting device 4. This increases the number of meshing gears and rotating shafts, resulting in transmission losses. However, the present invention solves this problem and suppresses transmission losses. A clutch 48 is provided on the first shaft 29 between the first gear 30 and the second gear 43. An engaging portion 50 is provided on the clutch 48 side of the first gear 30 to engage with and disengage from the engaging portion 48A of the clutch 48, and an engaging portion 51 is provided on the clutch 48 side of the second gear 43 to engage with and disengage from the engaging portion 48B of the clutch 48.

[0018] Therefore, when the clutch 48 is connected to the first gear 30, rotation is transmitted from the output shaft 24 of the continuously variable transmission 20 → input shaft 25 of the transmission case 21 → gear 27 → first gear 30 → clutch 48 → first shaft 29 and output to the harvesting device 4. Also, when the clutch 48 is switched and connected to the second gear 43, rotation transmitted from the output shaft 24 of the continuously variable transmission 20 → input shaft 25 of the transmission case 21 → gear 27 → first gear 30 → third gear 46 → second shaft 32 → fourth gear 45 → second gear 43 → clutch 48 → first shaft 29 is output to the harvesting device 4. In other words, by configuring the first gear 30 provided on the first shaft 29 to serve as both a transmission gear that transmits the variable speed rotation of the continuously variable transmission 20 to another rotating shaft (second shaft 32) and an input gear that transmits rotation to the first shaft 29, a direct transmission path can be constructed, simplifying the transmission path and suppressing transmission losses.

[0019] The first gear 30 and the second gear 43 are configured such that the rotation transmitted by the first gear 30 to the first shaft 29 is the standard speed, and the rotation transmitted by the second gear 43 to the first shaft 29 is the high-speed rotation (rotation for tilting). Therefore, while being able to handle the harvesting of lodged grain stalks, the configuration of the transmission path for the commonly used standard speed harvesting operation is simplified, thereby suppressing transmission loss and improving the durability of the transmission path. The harvesting output pulley 31 is composed of a pair of pulley bodies 53, and the pulley bodies 53A and 53B of the pair of harvesting output pulleys 31 have different diameters. As a result of miniaturizing the transmission 23, it became possible to arrange a double pulley, which was not possible with conventional designs, and the number of gear shifting stages was increased to four. In other words, by switching between the first gear 30 and the second gear 43 using the clutch 48, a two-speed transmission is achieved. Furthermore, by using a double pulley to create a two-speed transmission configuration, the transmission output to the harvesting device 4 can be configured into four stages.

[0020] This configuration, with its increased number of speed settings, allows for the selection and setting of a harvesting speed that matches the crop (matching the degree of lodging of the grain stalks). Furthermore, increasing the harvesting speed thins the layer of grain stalks being transported, reducing the threshing load. The transmission path from the harvesting output pulley 31 to the harvesting input pulley 52 of the harvesting device 4 is configured to use separate tension pulleys 55 to switch the transmission between each of the pair of belts 54, and the switching of the tension pulleys 55 is performed by a lever 56 or a motor 57 (Figures 5 and 6). An engagement portion 50 is provided on the first gear 30, which is rotationally transmitted from a gear 27 located on the input shaft 25 of the continuously variable transmission 20. Therefore, the variable speed rotation from the continuously variable transmission 20 can be transmitted to the engagement portion 48A of the clutch 48 via the engagement portion 50 of the first gear 30, and the first gear 30 and the clutch 48 can directly form a transmission path, reducing the number of meshing gears and rotating shafts, and thus reducing the output to the harvesting device 4, thereby reducing the transmission loss of the output.

[0021] This reduces the number of parts and assembly time in the transmission mechanism from the continuously variable transmission 20 to the harvesting device 4, makes the transmission 23 lighter, reduces the environmental impact by reducing the number of parts, and improves durability by increasing the thickness of the first gear 30, which is used frequently. Furthermore, the reduction in the number of parts on the upper part of the mission case 21 results in a lighter weight, which lowers the center of gravity of the mission case 21, stabilizing the aircraft's attitude and improving the aircraft's flight stability. Furthermore, the first shaft 29 of the transmission case 21 of the present invention has a structure with fewer gears on the shaft compared to conventional transmission structures, which reduces the load on the shaft and allows for a thinner shaft diameter than conventional transmission structures. Furthermore, the first shaft 29 has a structure with fewer gears on the shaft compared to conventional transmission structures, which allows for a shorter shaft length. This reduces shaft deflection, resulting in less noise and vibration. In addition, the weight of the machine can be reduced, improving fuel efficiency. The harvesting cylinder is positioned in the center of the machine frame 1 in the left-right direction. Therefore, by positioning the support position of the harvesting device 4 at the center of the machine, the stability of the machine is improved.

[0022] The harvesting output pulley 31 is constructed using a so-called double pulley system. In this case, the harvesting output pulleys 31 of the double pulley system will have different diameters. As a result of the miniaturization of the transmission 23, it became possible to arrange a double pulley, which was not possible with conventional designs, and the number of gear shifting stages increased to four. In other words, by switching between the first gear 30 and the second gear 43 using the clutch 48, a two-speed transmission is achieved, and by further configuring a two-speed transmission using a double pulley, the transmission can be configured with four gear stages. This configuration, with its increased number of speed settings, allows for the selection and setting of a harvesting speed tailored to the crop. Increasing the harvesting speed thins the layer of grain being transported, thereby reducing the threshing load. The transmission path from the harvesting output pulley 31 to the harvesting device 4 is configured to use separate tension pulleys 55 to switch the transmission on each of the pair of belts 54. Therefore, increasing the harvesting speed thins the straw layer and reduces the threshing load. The tension pulley 55 is switched using lever 56.

[0023] The mounting configuration of the tension pulley 55 is arbitrary, but as an example, a pair of tension pulleys 55 are provided on the left and right sides, each in contact with the belt 54, the tension pulleys 55 are attached to the ends of the arms 58, the base of the arms 58 are rotatably attached to the fixed part, and levers 56 are attached to the base of the arms 58 so that the arms 58 can rotate together (Figure 6). Therefore, when either the left or right lever 56 is operated, it contacts the belt 54, turning on the power transmission and outputting power to the harvesting device 4. The lever 56 may also be extended vertically and configured to be directly operable from the control unit 6. The switching of the tension pulley 55 may also be configured to use a motor 57. In this case, a motor 57 can be installed in place of the lever 56 in Figure 6. The configuration will use a single motor 57 for switching. Therefore, the switching mechanism can be configured simply.

[0024] In this case, the configuration of the tension switching mechanism is arbitrary, but the rotating body 60 is fixed to the output shaft of the motor 57, and the rotating body 60 and a pair of levers 56 are connected via an arm 61 and a rod 62 (Figures 2 and 7). Therefore, when the motor 57 is energized and the rotating body 60 is rotated once, one arm 61 engages the tension pulley 55, and the other arm 61 disengages the tension pulley 55. In addition, the output to the harvesting device 4 can be stopped separately from the tension switching mechanism by stopping the output of the continuously variable transmission 20 or by using the harvesting clutch (not shown), etc. The second gear 43, which is rotationally transmitted from the output gear 27 of the continuously variable transmission 20 via a bypass transmission path, is provided with an engagement portion 51, and the rotation is transmitted to the clutch 48 via the engagement portion 51 to rotate the first shaft 29. Furthermore, by making the number of teeth of the second gear 43 less than the number of teeth of the first gear 30, the first shaft 29 is configured to rotate at high speed.

[0025] In other words, when the engagement portion 48B of the clutch 48 is engaged with the engagement portion 51 of the second gear 43, the rotation of the second gear 43 is transmitted to the first shaft 29 via the clutch 48, and the harvesting device 4 is driven at high speed as the lodging speed via the belt drive from the harvesting output pulley 31. An engagement portion 51 is provided on the second gear 43, which is rotationally transmitted from the gear 27 of the continuously variable transmission 20. The engagement portion 51 is used to transmit rotation to the clutch 48, thereby rotating the first shaft 29. The first shaft 29 rotates at a standard speed, and the rotational transmission to the first shaft 29 is cut off by moving the clutch 48.

[0026] In other words, when the clutch 48 is moved to the left in the diagram, the engagement portion 48B of the clutch 48 that is engaged with the engagement portion 51 of the second gear 43 disengages from the engagement portion 51 of the second gear 43, and the drive rotation transmitted from the gear 27 to the first shaft 29 is interrupted as the clutch 48 moves to a neutral position. The rotation from the gear 27 of the continuously variable transmission 20 is transmitted at high speed through a bypass transmission path: first gear 30 → third gear 46 → second shaft 32 → fourth gear 45 → second gear 43. The engagement portion 48B of the clutch 48 is moved to the right in the diagram and engages with the engagement portion 51 of the second gear 43, causing the first shaft 29 to rotate at high speed (lodging speed) and driving the harvesting device 4 to rotate at high speed. In other words, by moving the clutch 48 to the right in the diagram and engaging the engagement portion 48B of the clutch 48 with the engagement portion 51 of the second gear 43, the rotation of the second gear 43 is transmitted to the first shaft 29 via the clutch 48, and the harvesting device 4 is driven at high speed via the belt drive from the harvesting output pulley 31.

[0027] Furthermore, the tooth width (gear width) of the first gear 30 is set to be greater than or equal to the tooth width of the second gear 43. This improves the durability of the first gear 30, which is used frequently. It is preferable to configure the left wall 69 of the transmission case 21 and the second gear 43 to be relatively close together, and to shorten the first shaft 29 that generates the harvesting output to the vicinity of the second gear 43. This makes it possible to miniaturize the transmission case 21. Therefore, since the length of the first shaft 29 is shortened, the deflection of the first shaft 29 itself can be reduced, resulting in reduced noise and vibration. [Explanation of Symbols]

[0028] 1...Machine frame, 2...Traction mechanism, 3...Threshing mechanism, 4...Harvesting mechanism, 5...Grain tank, 6...Control unit, 20...Hydraulic continuously variable transmission, 21...Transmission case, 22...Engine, 23...Transmission, 24...Output shaft, 25...Input shaft, 26...Third shaft, 27...Output gear, 29...First shaft (harvesting output shaft), 30...First gear (driven gear), 31...Harvesting output pulley, 32...Second shaft (counter shaft) 40...wheel gear, 41...wheel shaft, 43...2nd gear, 45...4th gear, 46...3rd gear (counter gear), 47...5th gear, 48...clutch, 48A...engaging part, 48B...engaging part, 50...engaging part, 51...engaging part, 52...harvesting input pulley, 53...pulley body, 54...belt, 55...tension pulley, 56...lever, 57...motor, 58...arm, 60...rotating body, 61...arm, 62...rod.

Claims

1. In a combine harvester, a continuously variable transmission (20) is provided downstream of the transmission path of the engine (22) to increase / decrease the output rotation of the engine (22) and switch the direction of rotation, and the output rotation of the continuously variable transmission (20) is transmitted to the running gear (2) and the harvesting gear (4) via a transmission (23), the output rotation of the engine (22) is transmitted from the output shaft (24) of the continuously variable transmission (20) to the input shaft (25) of the transmission (23) to the first shaft (29), second shaft (32), and third shaft (26) of the transmission (23), and the first shaft (29) is connected to the input shaft (25) of the transmission A combine harvester characterized by having a first gear (30) that is always meshed with a shaft (27), a second gear (43), and a clutch (48) that rotates integrally with the first shaft (29) between the first gear (30) and the second gear (43), the second shaft (32) having a third gear (46) that is always meshed with the first gear (30), a fourth gear (45) that is always meshed with the second gear (43), and a fifth gear (47) that transmits rotation to the third shaft (26), the first gear (30) having an engagement portion 50 that engages with the engagement portion (48A) of the clutch (48), and the second gear (43) having an engagement portion (51) that engages with the engagement portion (48B) of the clutch (48).

2. The combine harvester according to claim 1, wherein the variable speed rotation of the continuously variable transmission (20) is provided with two transmission paths: a direct transmission path from the output shaft of the continuously variable transmission (20) to the harvesting device (4) via gears on the first shaft (29), and a detour transmission path in which the first shaft (29) is detoured via a separately provided second shaft (32) to return the drive rotation to the first shaft (29) and output it to the harvesting device (4).

3. A gear (27) on the output shaft (24) of the continuously variable transmission (20) is constantly engaged with the first gear (30) on the first shaft (29) located near the output shaft (24). The rotation of the first gear (30) is transmitted to the harvesting output pulley (31) on the first shaft (29) protruding from the transmission case (21), and output to the harvesting device (4) in a direct transmission path configuration. A second gear is separately rotatably provided on the first shaft (29). The combine harvester according to claim 2, wherein a second gear (43) is provided in (43) which is rotated by transmission from a second shaft (32) located near the first shaft (29) to form a bypass transmission path, and a clutch (48) is provided between the first gear (30) and the second gear (43) to selectively switch and transmit the rotation of either the first gear (30) or the second gear (43) to the first shaft (29), thereby switching between a direct transmission path and a bypass transmission path.

4. The combine harvester according to claim 3, wherein a clutch (48) is provided on a first shaft (29) between a first gear (30) and a second gear (43), an engaging portion (50) that engages with and disengages from an engaging portion (48A) of the clutch (48) is provided on the clutch (48) side of the first gear (30), and an engaging portion (51) that engages with and disengages from an engaging portion (48B) of the clutch (48) is provided on the clutch (48) side of the second gear (43).

5. The combine harvester according to claim 4, wherein the number of teeth of the first gear (30) is greater than the number of teeth of the second gear (43), the rotation transmitted by the first gear (30) to the first shaft (29) is set to standard speed, and the rotation transmitted by the second gear (43) to the first shaft (29) is set to high-speed rotation.

6. A combine harvester is provided with two transmission paths: a continuously variable transmission (20) that increases or decreases the output rotation of the engine (22) and switches the direction of rotation (forward or reverse rotation) on the downstream side of the transmission path of the engine (22) on either the left or right side of the transmission case (21); a direct transmission path in which the rotation of the continuously variable transmission (20) is transmitted from the output shaft of the continuously variable transmission (20) via gears to a first shaft (29) and then output to the harvesting device (4); and a detour transmission path in which the drive rotation transmitted indirectly to the first shaft (29) via a separately provided second shaft (32) is returned to the first shaft (29) and output to the harvesting device (4).

7. A gear (27) on the output shaft (24) of the continuously variable transmission (20) is constantly engaged with the first gear (30) on the first shaft (29) located near the output shaft (24). The rotation of the first gear (30) is transmitted to the harvesting output pulley (31) on the first shaft (29) protruding from the transmission case (21), and output to the harvesting device (4) in a direct transmission path configuration. A second gear is separately rotatably provided on the first shaft (29). The combine harvester according to claim 6, wherein a second gear (43) is provided in (43) which is rotated by transmission from a second shaft (32) located near the first shaft (29) to form a bypass transmission path, and a clutch (48) is provided between the first gear (30) and the second gear (43) to selectively switch and transmit the rotation of either the first gear (30) or the second gear (43) to the first shaft (29), thereby switching between a direct transmission path and a bypass transmission path.

8. The combine harvester according to claim 7, wherein a clutch (48) is provided on a first shaft (29) between a first gear (30) and a second gear (43), an engaging portion (50) that engages with and disengages from an engaging portion (48A) of the clutch (48) is provided on the clutch (48) side of the first gear (30), and an engaging portion (51) that engages with and disengages from an engaging portion (48B) of the clutch (48) is provided on the clutch (48) side of the second gear (43).

9. The combine harvester according to claim 8, wherein the first gear (30) transmits rotation to the first shaft (29) at a standard speed, and the second gear (43) transmits rotation to the first shaft (29) at a high speed.

10. A combine harvester according to any one of claims 1 to 9, wherein the harvesting output pulley (31) is composed of a pair of pulley bodies (53), and the pulley bodies (53) of the pair of harvesting output pulleys (31) have different diameters.

11. The combine harvester according to claim 10, wherein the transmission path from the harvesting output pulley (31) to the harvesting device (4) is configured to be switched by separate tension pulleys (55) on each of the pair of belts (54), and the switching of the tension pulleys (55) is performed by a lever (56) or a motor (57).

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