JPH0720435Y2 - Transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Use The present invention includes an output member and a switching unit that selectively engages and switches a plurality of transmission gears, and the output member and the switching unit via a main clutch. More particularly, the present invention relates to an output member that facilitates selective meshing of a switching unit, for example, a structure of a pretreatment unit driving pulley in a combine.

(B) Conventional technology Generally, in a work vehicle, for example, a combine, the rotation of an engine is transmitted to an input transmission shaft through a continuously variable transmission composed of a drive side split pulley and a driven side split pulley, and the rotation is further forwarded. It is configured to be transmitted from the processing drive pulley to the pretreatment unit via the endless belt and to the traveling system via the gear train that is meshed with each other. Therefore, when the main clutch located upstream of the pretreatment drive pulley and the speed change unit is disengaged to perform a speed change operation,
The traveling transmission system connected to the traveling machine body via the sprocket is in a locked state, and the pretreatment transmission system in which the pretreatment drive pulley is connected to the pretreatment unit via the endless belt is also in a locked state. Therefore, when the slide gears interlocking with the traveling transmission system and the pretreatment transmission system are slid on the speed change shaft and meshed with the switching gears, if the teeth of these gears face each other, the teeth will face each other. Even with sufficient tooth chamfering, it was difficult to engage the teeth, and smooth switching operation could not be performed.

Therefore, in the past, the present applicant has proposed that a drive gear fixed to an input transmission shaft that rotates together with a driven side split pulley that constitutes a continuously variable transmission, an axle gear fixed to an axle, and a pretreatment drive pulley before being rotated. An input gear meshed with the drive gear, which is provided on a speed change shaft having a speed change gear that is selectable and slidable, is configured to be meshed with a pre-process gear fixedly mounted on the process transmission shaft. A gear transmission structure for an agricultural machine has been devised which is configured to be free to rotate around the axis of a speed change shaft (see Japanese Utility Model Laid-Open No. 62-89931).

The input gear in the gear transmission structure for agricultural machinery is rotatably fitted to the speed change gear, and a plurality of engaging claws provided on the side surface thereof are fixed to the speed change shaft adjacent to the speed change gear. When a plurality of engaging claws protruding from the fixed disc are engaged with each other, and when the opposing engaging claws are engaged with each other, the engaging claws extend over a predetermined angle around the axis of the transmission shaft. The clearance portion is formed so that the input gear on the speed change shaft extends over a predetermined angle around the axis of the speed change shaft by the clearance portion formed between the engaging claws and the engaging claws. It is configured to be idle.

(C) Problems to be Solved by the Invention However, in the gear transmission structure for agricultural machines devised by the applicant described above, the engaging claw formed on the input gear is free from the fixed disc. Therefore, the position of the play part formed by the engagement claw of the input gear and the engagement claw of the fixed disc is not fixed, and therefore even when the main clutch is disengaged, the play part is located only on one side of the engagement claw. Therefore, when the teeth of the slide gear 40 and the teeth of the other gear face each other, the slide gear can idle in one direction of the idle part, but can idle in the other side. There is a problem that the switching operation is not always performed smoothly.

(D) Means for Solving the Problems The present invention is intended to solve the above problems. For example, referring to FIGS. 1 and 2, the output member (27), And a switching unit (21) for selectively engaging and switching a plurality of transmission gears (37), (39), and rotating to the output member (27) and the switching unit (21) via the main clutch (75), respectively. In the transmission device configured to transmit the gears, the transmission gears (37), (39) and the slide gear (40) selectively meshing with the transmission gears have chamfered portions (37b), (39b), at the gear end surfaces facing each other. (40b) are formed (see FIG. 3), and the output member (27) is provided with a clearance (a) between them.
An output interlocking member (85) and an input interlocking member (82) that are connected to each other via engaging claws (81a) and (85a), and that the output interlocking member (85) and the input interlocking member (85) Between the input interlocking member (82), a clearance (a) formed by the engaging pawl (81a) of the input interlocking member (82) and the engaging pawl (85a) of the output interlocking member (85) is provided. 82) Engaging claw (81)
The transmission gears (37), (3) are interposed with an intermediate biasing means (86) for biasing and holding them so that they are positioned on both sides in the rotational direction of a).
When the slide gear (40) meshes with the slide gear (40), either the left or right rotation based on the chamfered portion is caused by the input interlocking member (85).
Absorbs by rotating the play part (a) against the intermediate urging means (86).

(E) Action Based on the above configuration, when the slide gear (40) meshes with the transmission gears (37) and (39) with the main clutch (75) disengaged, the gears are formed by the facing relationship of these gears. A force that the input interlocking member (82) tries to rotate in either the left or right direction acts on the basis of the chamfered portion. On this occasion,
With respect to the output interlocking member (85) in the locked state, the input interlocking member (82) is held by the intermediate urging means (86) so as to have a play portion (a) on the left and right, and therefore, the input interlocking member (82). The (82) can rotate in either the left or right direction, allows the input interlocking member to rotate based on the meshing of the gears, and meshes smoothly regardless of the facing relationship between the two gears.

Note that the reference numerals in parentheses do not limit the configuration in any way.

(F) Embodiment An embodiment according to the present invention will be described below with reference to the drawings.

The combine 1 has a sprocket 53 as shown in FIG.
It has a traveling machine body 3 supported by a crawler 2 driven by (see FIG. 1). On one side of the traveling machine body 3, an engine 4 is mounted on the rear side and a driver's seat on the front side. 5 is arranged, and an automatic threshing device is mounted on the other side of the traveling machine body 3. Further, a pre-processing unit 7 is disposed in front of the traveling machine body 3 so as to be able to move up and down, and below the traveling machine body 3 behind it, a mission case 19 is provided.
(See FIG. 1) is mounted. The driver's seat 5 has a driver's seat frame 10 fixed on the body frame,
A step surface 11 is fixed to the front part on the frame 10, and further on the rear part of the driver's seat frame 10,
A seat 13 is installed via a seat frame. An operation console 15 is erected above the front part of the driver's seat frame 10, and an upper surface of the operation console 15 is an operation panel 16.
Moreover, a monolever 17 is erected on the operation panel 16.

On the other hand, as shown in FIG. 1, the transmission case 19 accommodates a transmission 24 including an auxiliary transmission unit 20, a forward / reverse switching unit 21, a side clutch / brake device 22, and a traveling drive unit 23. An input transmission shaft 29 is installed laterally through the case 19 in the auxiliary transmission 20 located at the top of the transmission case 19. Further, one end of the transmission shaft 29 has a continuously variable transmission. A driven side split pulley 26 that constitutes the device 25 is installed, and a pretreatment drive pulley 27 that transmits rotation to the pretreatment unit 7 is installed at the other end. Further, a large-diameter gear 30 and a small-diameter gear 31 each having internal teeth are rotatably installed at both inner ends of the case of the input transmission shaft 29, and an auxiliary gear is provided between the large-diameter gear 30 and the small-diameter gear 31. The variable speed slide gear 32 is fitted so as to slide only.

Further, the forward / reverse switching portion 21 has a shaft 33 rotatably arranged in the case 19, and a large diameter gear 35 and a small diameter gear 36 are spline-coupled to both ends of the shaft 33, respectively. A reverse gear 37 having internal teeth and a forward gear 39 are rotatably installed on the large-diameter gear 35 and the small-diameter gear 36, respectively, and a speed change slide gear 40 slides in an intermediate portion between the gears 37 and 39. Only the movement is freely fitted. The large diameter gear 30 and the small diameter gear 36, and the small diameter gear 31 and the large diameter gear 35 are always meshed with each other,
The reverse gear 37 always meshes with a gear 42 fixed to a shaft 41 arranged adjacent to the shaft 33. Further, a counter shaft 43 is rotatably installed adjacent to the shaft 41, and a large diameter gear 45 and a small diameter gear 46 are splined to the shaft 43.
Engages with a gear 47 fixed to the shaft 41 and with a forward gear 39.

Further, the side clutch / brake device 22 has a center gear 50 provided at the center of the center shaft 49 and left and right side clutches C and C composed of dock gears 51 and 51 rotatably fitted to both ends thereof. In addition, it is equipped with left and right side brakes B, B having a large number of disc plates. Further, the traveling drive unit 23 has axles 52, 52 protruding toward both sides of the case 19, the axle 52 has a sprocket 53 at one end thereof and a drive gear 55 at the other end. is set up. Further, a shift rail 56 is arranged above the mission case 19, and a shift fork 57 is slidably inserted into the rail 56 via a click stop so that the fork 57 can be operated. Thus, the sub-transmission slide gear 32 slides and engages with the inner teeth of the large-diameter gear 30 or the small-diameter gear 31, whereby the high speed and the low speed can be switched.

On the other hand, as shown in FIG. 4, a counter case 68 is installed above the mission case 19, and a variable speed endless belt 69 is wound around the counter case 68 with the driven side split pulley 26. A drive side split pulley 70 that is hung to form the continuously variable transmission 25 is installed. Further, the split pulley 70
The rotation of the engine 4 is transmitted via the endless belt 71 to rotate, and the width thereof is changed by the speed change cam 72 operated by the expansion and contraction operation of the hydraulic actuator 67 for continuously variable speed to change the speed of the speedless endless belt 69. It is configured to move and thereby appropriately change the transmission ratio. Further, a pipe rod 73 is installed so as to interlock with the operation of the continuously variable transmission hydraulic actuator 67, and the pipe rod 73 connects and disconnects the driven side split pulley 26 and the main clutch 5 provided on the driving shaft. A rod 77 that interlocks with the clutch cam 76 is slidably fitted. Therefore, when the continuously variable electromagnetic switching valve 66 is operated by the signal based on the CPU 65 and the continuously variable hydraulic actuator 67 contracts, the rod 77 pushed down by the pipe rod 73 interlocks with the clutch cam 70 when the continuously variable hydraulic actuator 67 contracts. When the main clutch 75 is operated to disconnect the hydraulic actuator 67 and the hydraulic actuator 67 extends, the pipe rod 73 releases the rod 77 in conjunction with this, so that the clutch cam 76 is rotated in the clutch connecting direction by a spring (not shown). Then, the main clutch 75 is connected. Accordingly, when the hydraulic actuator 67 for continuously variable transmission is extended, the main clutch 75 is connected and the continuously variable transmission 25 is accelerated, and when the hydraulic actuator 67 is contracted, the continuously variable transmission 25 is decelerated. At the same time, the main clutch 75 is disconnected. Reference numeral 79 in the figure denotes a switching arm that operates in conjunction with the tilting operation of the FR right / left continuously variable lever 62 in the left-right direction to operate the forward / reverse switching unit 21.

On the other hand, as shown in FIGS. 1 and 2A, the pretreatment drive pulley 27 includes a holder member 82 fitted and fixed to a boss 81 spline-coupled to the other end of the input transmission shaft 29, and a bearing.
The pulley member 85 is rotatably fitted to the boss 81 via 83, and these holder member 82 and pulley member 85
Are arranged facing each other. Further, a holder pin 82a and a pulley pin 85a are formed on the holder member 82 and the pulley member 85 so as to be opposed to each other, and a torsion spring 86 is fitted in a spring locking portion 85b formed on the pulley member 85. The torsion spring 86
The bent portions 86a, 86a formed at both ends sandwich the holder pin 82a and the pulley pin 85a from both sides thereof so as to be aligned on a straight line passing through the transmission shaft 29. Further, a boss claw 81a ... Is formed at one end of the boss 81, and a pulley claw 85c ... Is formed at a portion of the pulley member 85 facing the boss claw 81a. As shown in the figure (b), between the adjacent pulley claws 85c and the pulley claws 85c, there is a clearance on both sides in the rotation direction.
It is biased by the torsion spring 86 so as to have a and a. In addition, b in FIG. 1 is a pretreatment endless belt which interlocks and connects the drive pulley 27 and the pretreatment unit 7.

Therefore, the holder pin 82a and the pulley pin 85a are sandwiched from both sides in a straight line portion of the bent portions 86a, 86a in FIG. 2 (a) so as to be aligned in a straight line, and the boss claw 81a and the pulley claw 85c and the pulley claw 85a.
Since it is located in the central portion of c and has play portions a and a on both sides in the direction of rotation thereof, it is a direction orthogonal to the axis of the pulley member 85 or the holder 82 in FIG. Due to the rotation, the holder pin 82a resists the biasing force of the bent portion 86a to move the second pin.
When rotated to the position shown by the two-dot chain line in FIG.
The boss claw 81a comes into contact with the pulley claw 85c to transmit the rotation from the engine 4.

Further, as shown in FIGS. 3 (a) and 3 (b), the reverse gear 37
(Or forward gear 39) has internal teeth 37a ... (or 39a ...), and teeth 40a ... formed on the sliding speed-change slide gear 40 mesh with the internal teeth 37a ... (or 39a ...). The internal teeth 37a ... (or 39a ...) and the teeth 40a of the slide gear 40 ... The chamfered portion 37b (or 39) at the end.
b) and the chamfered portion 40b are respectively formed.

Since the present embodiment is configured as described above, when the driving force based on the engine 4 is transmitted to the counter case 68 via the endless belt 71, the drive side split pulley 70 is rotated and the variable speed endless belt 69 is passed. The rotation is transmitted to the driven side split pulley 26.

Then, when the FR stepless speed change lever 62 is tilted in the direction of arrow A in FIG.
79 is operated in conjunction with a rod etc.
40 slides toward the forward gear 39, and the teeth of the slide gear 40
40a ... meshes with the internal teeth 39a of the forward gear 39. At this time, if the teeth 40a and the internal teeth 39a are to be engaged with each other in a state of facing each other, the main clutch 75 is disengaged at this point, and the holder member 82 is disengaged from the pulley member 85. Since it is flexible via a and a, the large diameter gear 35 (or small diameter gear 36), small diameter gear 31 (or large diameter gear 3
0), and the transmission slide gear 40 connected to the holder member 82 via the input transmission shaft 29, with respect to the forward gear 39 which is locked by being connected to the traveling machine body via a number of gears,
The tooth 40a can be freely rotated by a predetermined amount in any of its rotation directions, and therefore the tooth 40a can be switched between the forward and reverse movements.
Even if the tooth faces and contacts the tooth 39a (or 37a) of the forward gear 39 (or reverse gear 37), it can rotate in either direction to avoid the contact, and the switching between forward and reverse can be performed smoothly. Can be done.

Then, when the main clutch 75 is re-engaged and the transmission shaft 29 starts to rotate, the pulley claw 85c of the pulley member 85 is locked by the boss 81.
The rotation is transmitted from the boss claw 81a. At this time, the urging force from the torsion spring 86 when the holder pin 82a rotates with respect to the pulley pin 85a is applied while the one end of the boss claw 81a moves in the free space a so as to come into contact with the one end of the pulley claw 85c. Therefore, the rotation transmitted through the input transmission shaft 29 when the main clutch 75 is connected is buffered, and is transmitted to the pulley member 85 as a gradually increasing torque.
No shocking torque is transmitted to the preprocessing unit 7,
As a result, it is possible to reliably prevent problems such as damage to the pretreatment unit 7.

(G) Effect of the Invention As described above, according to the present invention, the engaging claw (81a) of the input interlocking member (82) is provided between the output interlocking member (85) and the input interlocking member (82). An intermediate urging means (86) for urging / holding a free space (a) formed by the engaging claw (85a) of the output interlocking member (85) so as to be positioned on both sides in the rotation direction of the engaging claw (81a). , So disconnect the main clutch (75),
When the speed change gears (37) and (39) are selectively meshed in the switching portion (21), even if the teeth of the gears face each other, the teeth are swung quickly in either direction. The contact can be surely avoided, so that the switching operation can be performed smoothly in any case.

[Brief description of drawings]

FIG. 1 is an overall cross-sectional view of a transmission case showing a transmission structure according to the present invention, FIG. 2 (a) is a side view showing a combined structure of a holder member and a pulley member, and FIG. 2 (b) is a boss pawl and a pulley. FIG. 3 (a) is a side view showing the meshing state of the forward / reverse gear and the transmission slide gear, FIG. 3 (b) is a plan view thereof, and FIG. 4 is a gear shifting operation system. It is a figure which shows a power transmission system. FIG. 5 is a perspective view showing the whole combine. 21 ... Switching unit (forward / reverse switching unit), 27 ... Output member (pretreatment drive pulley), 37, 39 ... Shift gear (reverse gear, forward gear), 75 ... Main clutch, 81a ... Engaging claw (boss claw) ), 82 ... Input interlocking member (holder member), 85 ... Output interlocking member (pulley member), 85a ... Engaging claw (pulley claw), 86 ...
Intermediate biasing means (torsion spring), a ...

Claims (1)

[Scope of utility model registration request] 1. A transmission device comprising an output member and a switching unit for selectively engaging and switching a plurality of transmission gears, and transmitting rotation to the output member and the switching unit via a main clutch, respectively. Output interlocking in which chamfered portions are formed on gear end surfaces of a transmission gear and a slide gear selectively meshing with the transmission gear, which oppose each other, and the output members are connected to each other via engaging claws having a clearance portion. A member and an input interlocking member, and between the output interlocking member and the input interlocking member, a clearance between the engagement pawl of the input interlocking member and the engagement pawl of the output interlocking member is the input interlocking member. When a slide gear meshes with the speed change gear, an intermediate urging means that urges and holds the engaging claw so as to be positioned on both sides in the rotational direction of the engaging claw is used, and any left or right rotation based on the chamfered portion is caused by the input. Interlocking part A transmission device characterized in that the material absorbs by rotating the play part against the intermediate urging means.