JP4903739B2 - Mowing transmission - Google Patents

Description

  The present invention relates to an improvement in a harvesting transmission device provided for shifting a harvesting speed between high and low in a transmission system from a transmission case to a harvesting conveyance device in a harvesting machine such as a combine.

As the above-described combine, those having the structures shown in [1] and [2] below are known.
[1] The output from the engine is shifted by an HST (hydrostatic continuously variable transmission) and introduced into the transmission case, and the transmission case is branched into a driving system and a cutting unit driving system. The power is gear-shifted in the transmission case and transmitted to the traveling unit, and the power of the cutting unit drive system is transmitted to the cutting unit via a one-way clutch (see Patent Document 1). [2] The output from the engine is shifted by an HST (hydrostatic continuously variable transmission) and introduced into the transmission case, and then branched into the driving system and the cutting unit driving system in the transmission case. The power is gear-shifted in the transmission case and transmitted to the traveling unit, and the power of the cutting unit drive system is also gear-shifted to a high and low level and transmitted to the cutting unit via a one-way clutch (see Patent Document 2) ).

JP 2002-274204 A (paragraphs [0014], [0015], [0017], FIG. 2, FIG. 3, FIG. 4, FIG. 5) JP 11-32557 A (paragraphs [0039], [0040], FIG. 2, FIG. 22)

As shown in Patent Documents 1 and 2, the output from the engine is shifted by an HST (hydrostatic continuously variable transmission) and introduced into the transmission case, and the traveling drive system and the cutting unit drive system are In the structure of branching and transmitting, the cutting speed can be changed and driven according to the traveling speed.
However, in this type of combine, when the airframe is operated backward, rotational power in the direction opposite to the forward direction is also transmitted to the cutting unit drive system. It is necessary not to communicate. For this reason, in the thing of the said patent documents 1 and 2, the one-way clutch was provided in the pulley for output provided in the output shaft to a cutting part.
As described above, if the one-way clutch is provided in the output pulley attached to the output shaft protruding from the transmission case, the axial length of the output pulley itself is increased, and the output pulley is enlarged. In addition, there is an inconvenience that the arrangement space for that is increased, and the arrangement space inside the combine where various transmission members are complicated is reduced.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a cutting transmission having a one-way clutch with a simple structure while avoiding an increase in the size of an output pulley when a one-way clutch is provided in a power transmission system to a cutting unit.

[Solution 1 ]
First solution in cutting the transmission of the present invention, as described in claim 1, reaper fast and slow side output rotary member on the axis at a site located within the transmission case of the output shaft of the conveying device thereby deploy and for side output rotor, the shaft at a site located between the low-speed output rotary member a site located within the transmission case of the output shaft and the high-speed side output rotary member A shifted member for high and low speed shifting that can be slid freely is provided on the top,
The form and the shift member, the teeth of the power transmission to each of the opposed surfaces of the low-speed side output rotary member and the high-speed side output rotary member,
Wherein said tooth portions formed on respective opposing surfaces of and the shift member and the low-speed side output rotary member, formed in said respective opposing surfaces of the rotating body for the high-speed side output the shift member each other in each of the teeth, as the reverse direction of rotation of the driving side of the one-way rotation of the driven side to the direction of rotation to engage one another Kakarigose' immediate and the driving side to communicate is not transmitted to the driven side An inclined surface that can be ridden with the rotation in the reverse direction is formed on the opposite surface of the tooth portion.

[Action and effect]
As described above, the cutting transmission of the present invention according to the solution 1 does not provide a one-way clutch inside the output pulley, but effectively uses the transmission for high and low speeds installed in the transmission case. Thus, the one-way rotation mechanism is configured to be small.
In other words, the shift target for high / low speed shifting that is slidably disposed on the output shaft between the low speed side output rotating body and the high speed side output rotating body, which is necessarily provided in the high / low speed shifting transmission. Simple structure that changes the tooth shape of the tooth portion formed on the opposing surfaces of the shifted member, the high-speed side output rotator, and the low-speed side output rotator using the member effectively As a result of the improvement, a compact one-way rotation mechanism can be constructed without causing an increase in the size of the apparatus.
Therefore, there is an advantage that the output pulley necessary for power transmission to the cutting and conveying device while avoiding reverse rotation when the aircraft is moving backward can be reduced by reducing the arrangement space and by simply improving the structure of the cutting transmission itself. is there.

[Solution 2 ]
Second aspect in cutting the transmission of the present invention, as described in claim 2, between sites and the low-speed side output rotary member located within the transmission case of the output shaft, the object to be is characterized in that the one-way clutch for transmitting the rotation of the same direction as the rotation direction transmitted by the respective opposing tooth portion formed on surface of the shift member and the high-speed side output rotary member at a point that is interposed.

[Action and effect]
As described above, the cutting transmission of the present invention according to the solving means 2 has the following effects in addition to the same effects as the invention according to the solving means 1 .
In other words, when the stalk toe to be harvested is extremely prone and needs to be greatly increased, the cutting transmission is switched to the high speed side in order to increase the ratio of the triggering speed to the traveling speed of the aircraft. When the shifted member is disengaged from the low-speed output rotator and engaged with the high-speed output rotator, no power is transmitted to the shifted member from either the high or low side. Occurs.
Therefore, if the power is transmitted to the output shaft only through the shifted member, there is a possibility that the power is not transmitted only while the above engagement is not performed. A one-way clutch that transmits rotation in the same direction as the rotation direction transmitted by the tooth portions formed on the opposed surfaces of the shifted member and the high-speed side output rotating body also between the side output rotating body Since it is interposed, there is an advantage that power can be continuously transmitted to the output shaft in a state where there is no power interruption.
[Solution 3]
According to a third aspect of the cutting transmission of the present invention, as described in claim 3, the low-side output rotator and the high-speed output rotator have lateral end surfaces facing the shifted member. A partial arc-shaped hole that is recessed in the direction in which the tooth portion of the member to be shifted is engaged,
The engagement contact surfaces of the low-speed output rotator and the high-speed output rotator are formed at one end of the hole in the circumferential direction of the low-speed output rotator and the high-speed output rotator. And
The inclined surfaces of the low-speed output rotator and the high-speed output rotator are formed at the other end of the hole in the circumferential direction of the low-speed output rotator and the high-speed output rotator. There is a feature in the point.

  Hereinafter, an example of an embodiment of the present invention will be described based on the drawings.

[Overall structure of the combine]
First, the structure of the entire combine to which the cutting transmission of the present invention is applied will be described.
FIG. 1 shows the entire side surface of the self-removing combine, and FIG. 2 shows the entire plane. This combine is provided with a body frame 1 formed in a frame shape by a square pipe material or the like, and a pair of left and right crawler type traveling devices 10 are provided at the lower part of the body frame 1. A cutting and conveying device 3 connected to the front and left front portions of the body frame 1 so as to be able to move up and down is provided, a threshing device 4 is mounted on the left rear portion of the body frame 1, and a grain storage device is mounted on the right rear portion of the body frame 1. 5, and further includes a driving unit 6 provided on the right front portion of the body frame 1, a boarding operation unit 11 formed on the upper side of the driving unit 6, and the like.
As shown in FIG. 2, the boarding operation unit 11 includes a shift lever 11 </ b> A that performs a forward / reverse shift operation of the aircraft, and a steering operation lever 11 </ b> B that performs a steering operation of the aircraft, and a high / low shift of the cutting transmission device 2. An operation panel 11C for instructing operations and the like is provided.

[Configuration of transmission system]
The engine 60 provided in the prime mover 6 is mounted on the body frame 1 in a posture in which the axial center direction of the output shaft 60A is laterally oriented. As shown in FIG. 3, the transmission from the engine 60 to the left and right crawler type traveling devices 10 is performed from the left end portion of the output shaft 60A of the engine 60 projecting toward the left and right central portion of the machine body. This is performed via a transmission system for traveling over the drive wheels 10A of the traveling device 10. The traveling transmission system includes a belt-type transmission 12, a hydrostatic continuously variable transmission 13 provided as a main transmission, and a gear-type transmission (not shown) incorporated in the transmission case 14 as an auxiliary transmission. , Etc.

  Each of the left and right crawler type traveling devices 10 switches between a stepless speed change operation and a forward / reverse movement by the hydrostatic continuously variable transmission 13 by swinging the speed change lever 11A provided in the boarding operation unit 11 in the front / rear direction. In addition, the steering operation lever 11B equipped in the boarding operation unit 11 is swung in the left-right direction, so that the gear-type transmission in the transmission case 14 moves straight, and the left and right turns slowly. It is configured to be able to switch between a state and a left and right sudden turning state.

  The chopping and conveying device 3 has a plurality of pulling devices as the power after shifting by the hydrostatic continuously variable transmission 13 is transmitted via the chopping transmission 2 and a belt tension type reaping clutch 30 described later. 32, the clipper-shaped mowing device 33, the cereal conveying device 34, and the like are driven, and as the machine travels, the plurality of weeding tools 35 provided at the front end of the planted cereal cedar are planted. Each pulling device 32 causes the planted culm after weeding, and the cutting device 33 cuts the planted side of the planted culm, and the culm transporting device 34 lifts the harvested culm from the standing posture. It is configured to convey toward the rear threshing device 4 while switching to the sideways posture, and by moving the steering operation lever 11B in the front-rear direction, the lift cylinder 16 is operated to lift and lower the cutting and conveying device 3. Can now operate There.

  The threshing device 4 is the power of the engine 60 transmitted through the belt-tension type threshing clutch 40, and the barrel 41 and the like are driven. It is constituted by a known structure that handles and processes the head side and supplies the grain obtained by the sorting process to the grain tank 51 of the grain storage device 5 via the first recovery screw (not shown). ing.

  The feed chain 42 is configured so that power from the engine 60 is transmitted by a transmission system branched from the transmission system to the threshing device 4 by a transmission belt 43 and via a tension clutch type feed chain clutch 44. It is. Then, the feed chain clutch 44 is arbitrarily operated to drive the threshing device 4 at a different timing from the start or end of driving.

  The grain storage device 5 includes a grain tank 51 and a grain discharge auger 52, and is configured such that the power of the engine 60 is transmitted to the grain discharge auger 52. That is, the transmission belt 54 is stretched over the input portion 53 of the grain storage device 5 from the portion of the output shaft 60A of the engine 60 that protrudes from the right lateral side toward the outer side of the machine body. A belt tension type grain discharging clutch 50 for turning on and off the power transmission is provided.

The Glen tank 51 has a working position where the whole is located behind the engine 60 around the longitudinal axis y provided at the rear part thereof, and a front part of the Glen tank 51 protrudes outward to the right of the fuselage frame 1 so that the rear side of the engine 60 It is configured to be able to swing and displace over a maintenance position that opens the position, and to be able to hold the position at the work position and the maintenance position by a lock mechanism (not shown).
The screw conveyor 55 and the input portion 53 for the grain discharge auger 52 provided at the bottom of the Glen tank 51 that swings and displaces in this way allow the Glen tank 51 to swing around the longitudinal axis y. It has a disengagement structure.

That is, as shown in FIG. 3, the input pulley 56 on which the transmission belt 54 is stretched, and the transmission shaft 57 that is spline-fitted to the input pulley 56 so as to be integrally rotatable and relatively slidable are provided in the machine body. It is supported by a bearing bracket 1a provided on the frame 1 side.
The power transmitted to the transmission shaft 57 is transmitted to an input transmission shaft 58 that is engaged and disengaged with respect to the transmission shaft 57, and the bevel gear 58 a of the input transmission shaft 58 and the screw conveyor 55 The screw conveyor 55 and the grain discharging auger 52 are transmitted via a bevel gear 55a provided on the shaft end side.
The input transmission shaft 58 is supported on the Glen tank 51 side, and includes a recessed engagement portion 58b that can be inserted into and removed from the transmission shaft 57, while the rotational power from the transmission shaft 57 is transmitted. Since it can be inserted and removed in the axial direction, engagement and disengagement associated with the swing of the Glen tank 51 around the longitudinal axis y can be allowed.
Reference numeral 59 in the drawing denotes a pressing spring for pressing and urging the transmission shaft 57 toward the input transmission shaft 58.

[Configuration of the cutting gearbox]
The cutting speed in the cutting and conveying device 3 is not only a stepless speed change by the hydrostatic continuously variable transmission 13 but also a cutting speed change device 2 that can be operated in two steps of high and low steps provided in the mission case 14. The speed can also be changed.
The trim transmission 2 will be described in detail.

  As shown in FIGS. 4 to 8, the cutting gear shifter 2 is configured so that the power from the transmission upper side with respect to the cutting output shaft 21 that supports the cutting pulley 31 provided on the upper lateral side of the transmission case 14. A gear stage switching mechanism 2A that can be switched between a state that outputs to the cutting and conveying apparatus 3 at a high speed and a state that outputs at a low speed, and a gear shifting operation mechanism 2B that performs a gear shifting operation of the gear stage switching mechanism 2A. .

The shift stage switching mechanism 2A is engaged with a shift member 22 that is splined to the cutting output shaft 21 so as to be slidable, and can be engaged with and disengaged from one end of the shift member 22 in the sliding direction. An example of an output rotator that can be engaged and disengaged opposite to the end of the high speed side output gear 23, which is an example of an output rotator, and the end of the shifted member 22 in the direction opposite to the one end in the sliding direction. It is composed of a certain low-speed side output gear 24.
The high-speed side output gear 23 and the low-speed side output gear 24 correspond to a driving-side rotating body positioned on the upper side in the transmission direction with respect to the shifted member 22, respectively. The shifted member 22 engaged with and disengaged from the low-speed output gear 24 becomes a driven-side rotating body, and the engine-side power is transmitted to the cutting output shaft 21 via the shifted member 22.
That is, as shown in FIGS. 4 to 8, the shifted member 22 that is spline-fitted to the output shaft 21 that supports the cutting output pulley 31 provided on the upper lateral side portion of the transmission case 14 is disposed in the transmission case 14. Thus, the shift operation can be freely performed between a state in which the high speed side output gear 23 is loosely fitted to the output shaft 21 and a state in which the high speed side output gear 24 is engaged.

Both end portions of the shifted member 22 in the sliding direction and the opposing surfaces of the high speed side output gear 23 and the low speed side output gear 24 facing the respective end portions are engaged tooth portions 22a, 23a, 24a, respectively. Is formed.
Among these tooth portions 22a, 23a, 24a, in the tooth portions 22a, 23a between the shifted member 22 and the high-speed side output gear 23, as shown in FIGS. When engaged so that 23a engages, it has the engagement contact surfaces 22b and 23b engaged in the state which prevents the rotation to a mutually reverse direction. Then, inclined surfaces 22c and 23c that can be ridden with the rotation in the opposite direction are formed on the opposing surfaces of the tooth portions 22a and 23a so as to be disengaged when there is a speed difference between the rotations in the same direction. Thus, the rotation in the reverse direction on the driving side is not transmitted to the driven side.
In this case, on the shifted member 22 side, the tooth portion 22a protrudes in the engaging direction to form the engaging contact surface 22b and the inclined surface 22c, but on the high speed side output gear 23 side, the engaging portion 22a is engaged. The engagement contact surface 23b and the inclined surface 23c are formed at the circumferential end of the partial arc-shaped hole portion 70 that is recessed in the direction to constitute the tooth portion 23a.
Therefore, as shown in FIG. 8, the tooth portions 22a and 23a are engaged with each other, and the tooth portion 23a of the high speed side output gear 23 which is the rotation side in the forward direction of the machine body (the direction of the arrow f in FIG. 8) and which is the driving side. If the rotational speed is higher than the toothed portion 22a of the shifted member 22 on the driven side, the power from the high-speed side output gear 23 is transmitted to the shifted member 22, and the cutting and conveying device 3 is driven at a high speed. . If the rotational speed of the shifted member 22 on the driven side exceeds the rotational speed of the high-speed output gear 23 in this rotational direction, the preceding member of the shifted member 22 is allowed to rotate in the same direction. In form, such a phenomenon does not occur.

When rotation in the reverse direction of the vehicle body is transmitted to the high speed side output gear 23, the tooth portion 23a of the high speed side output gear 23 moves in the direction of the arrow r in FIG. By moving in a direction away from each other by cooperation, the reverse rotation of the high-speed output gear 23 is prevented from being transmitted to the shift target member 22, and the reverse rotation driving of the cutting and conveying device 3 can be avoided.
That is, the tooth portion 22a formed on the shifted member 22 and the tooth portion 23a formed on the high-speed side output gear 23 transmit only rotation in one direction, and rotation in the reverse direction rides on the inclined surfaces 22c and 23c. A one-way clutch 20 of a jump clutch type that jumps and disengages is constituted.

Although not shown, between the shifted member 22 and the low speed side output gear 24, tooth portions 22a and 24a similar to the tooth shape between the shifted member 22 and the high speed side output gear 23 are formed. The power of the forward side of the fuselage is transmitted through the engagement contact surfaces 22b and 23b formed in the respective tooth portions 22a and 24a, and the reverse side is driven by the inclined surfaces 22c and 24c that can be ridden with rotation in the reverse direction. It is configured to avoid transmission of power.
Therefore, when rotation in the reverse direction of the vehicle body is transmitted to the low speed side output gear 24, the tooth portion 24a of the low speed side output gear 24 moves in the direction of the arrow r in FIG. 8 and the inclined surface of the tooth portion 22a of the member 22 to be shifted. In the direction away from each other, the reverse rotation of the low-speed output gear 24 is prevented from being transmitted to the shifted member 22, and the reverse rotation drive of the cutting and conveying apparatus 3 can be avoided.

The shift operation mechanism 2B that operates the shift target member 22 at high and low speeds includes a shift shaft 25 that is pivotally supported while penetrating the transmission case 14, and an arm member that rotates the shift shaft 25 outside the transmission case 14. 26, an electric motor 27 for rotating the arm member 26, and an operation wire 27a.
By operating the pulling operation of the operation wire 27a connected to one end side of the arm member 26 (pulling operation to rotate clockwise in FIG. 4), the shifted member 22 is operated to the high speed side (FIG. 4A). ) And is always urged toward the low speed side (return urging rotated in the counterclockwise direction in FIG. 4) by the urging force of the return spring 28 connected to the other end of the arm member 26 (FIG. 4 (FIG. 4). b)).
The activation of the electric motor 27 is configured so as to be able to alternately switch between a high cutting speed and a low cutting speed by pressing an operation button B on an operation panel 11C provided in the boarding operation unit 11.

  As shown in FIG. 5, a well-known one-way clutch 29 using a roller is interposed between the output shaft 21 of the output pulley 31 for cutting and the low-speed output gear 24. Only power is output from the output pulley 31 for cutting output shaft cutting. This one-way clutch 29 operates from the output pulley 31 for harvesting until the shifted member 22 is disengaged from the low-speed output gear 24 and engaged with the high-speed output gear 23 by operating the shift operating means. In order to avoid the temporary disappearance of the output, the power transmission from the low-speed output gear 24 is continued until the meshing start of the shifted member 22 and the high-speed output gear 23 starts.

[Other Embodiment 1]
In the above-mentioned “best mode for carrying out the invention”, a known one-way clutch 29 using a roller is interposed between the output shaft 21 of the output pulley 31 for cutting and the low-speed side output gear 24 so as to be covered. A structure that prevents the output from the output pulley 31 from temporarily disappearing until the shift member 22 is disengaged from the low-speed output gear 24 and meshed with the high-speed output gear 23. Although shown, the one-way clutch 29 can be omitted. That is, the output shaft 21 of the cutting output pulley 31 and the low-speed output gear 24 may be configured to be relatively rotatable.

[Second embodiment]
In the cutting transmission 2, the return spring 28 is not limited to a tension spring that is used by forming hook portions for hooking at both ends. For example, a coil spring is sandwiched between end plates and the return spring 28 is compressed. It may be used in such a way as to generate power. In this way, since it is not necessary to form a hook portion formed by bending the end of the tension spring, even if the one-way clutch 20 of the jump clutch type repeats the jump operation when the aircraft is moving backward, This is effective in avoiding the possibility of cracks in the hook portion.

[3 of another embodiment]
Engaging tooth portions 22a, 23a formed on both ends of the shifted member 22 in the sliding direction, and on each of the opposing surfaces of the high-speed output gear 23 and the low-speed output gear 24 facing each end. As shown in “Best Mode for Carrying Out the Invention”, reference numeral 24a denotes a tooth portion 22a on the shifted member 22 side, tooth portions 23a and 24a of the high speed side output gear 23, and the low speed side output gear 24. Need to have engaging contact surfaces 22b, 23b, 24b and inclined surfaces 22c, 23c, 24c that engage with each other in the rotational direction so as to transmit the unidirectional rotation on the driving side to the driven side. For example, the engagement contact surface 22b and the inclined surface 22c are formed only at the tooth portions 22a at both ends on the shifted member 22 side, and the opposing surfaces of the high speed side output gear 23 and the low speed side output gear 24 are formed. Formed in each of That tooth portions 23a, 24a may be such as to form a mere through holes.

[4 of another embodiment]
In order to perform the switching operation to the high speed state in the cutting transmission 2, the operation tool provided in the operation panel 11 </ b> C is not limited to the push button B described above, and an operation tool such as a dial switch or an operation lever is used. An appropriate configuration, such as detecting a command work by detecting an operation position, can be employed.

[5 of another embodiment]
The means for performing the switching operation to the high speed state in the cutting transmission 2 is not limited to the one using the electric motor 27, and may be performed manually in conjunction with a manually operated lever provided separately. Good.

Overall side view of self-removing combine Overall plan view of self-decomposing combine Explanatory diagram showing the transmission system Plan view showing the operating mechanism of the mowing transmission Sectional view showing the mowing transmission part The members to be shifted are shown, (a) is a front view, (b) is a sectional view, and (c) is a rear view. A high-speed side shift gear is shown, (a) is a front view, and (b) is a sectional view. Sectional drawing which shows the tooth | gear part of a to-be-shifted member and a high-speed side output gear

DESCRIPTION OF SYMBOLS 1 Airframe frame 2 Cutting transmission 2A Shift stage switching mechanism 2B Shifting operation mechanism 3 Cutting conveyance device 4 Threshing device 5 Grain storage device 20 One-way clutch 21 Cutting output shaft 22 Shifted member
22a tooth
22b engagement contact surface
22c inclined surface 23 Rotating body for high speed side output
23a tooth part
23b engagement contact surface
23c inclined surface 24 Rotating body for low speed side output
24a tooth part
24b engagement contact surface
24c inclined surface
70 holes

Claims (3)

A portion where the low-speed output rotator and the high-speed output rotator are arranged on the shaft in the portion of the output shaft located in the transmission case to the cutting and conveying device, and the portion of the output shaft located in the mission case A shift member for high and low speeds that is slidable on a shaft in a portion located between the low-speed output rotator and the high-speed output rotator is provided,
Forming a tooth portion for power transmission on each of the opposed surfaces of the shifted member, the low-speed-side output rotator, and the high-speed-side output rotator;
The tooth portions formed on the opposing surfaces of the shifted member and the low-speed output rotor, and the tooth portions formed on the opposing surfaces of the shifted member and the high-speed output rotor. each tooth portion, the driving side Kakarigose' immediate and transmitted so as not to each other physicians in the opposite direction of rotation the driven side of the driving side of the one-way rotation to engage each other in the rotational direction to convey to the driven side of the The cutting transmission which forms the inclined surface which can ride on the opposing surface of a tooth | gear part with the rotation of the said reverse direction. Between the portion of the output shaft located in the transmission case and the low-speed output rotating body, tooth portions formed on the respective opposed surfaces of the shifted member and the high-speed output rotating body The cutting transmission according to claim 1, further comprising a one-way clutch for transmitting rotation in the same direction as the transmitted rotation direction . A partial arc-shaped hole that is recessed in the direction in which the tooth portion of the shifted member engages from the lateral end face toward the shifted member in the low-speed output rotating member and the high-speed output rotating member. Set up a section,
The engagement contact surfaces of the low-speed output rotator and the high-speed output rotator are formed at one end of the hole in the circumferential direction of the low-speed output rotator and the high-speed output rotator. And
The inclined surfaces of the low-speed output rotator and the high-speed output rotator are formed at the other end of the hole in the circumferential direction of the low-speed output rotator and the high-speed output rotator. cutting transmission according to claim 1 or 2 wherein there Te.

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