JP3734513B2 - Work vehicle transmission - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a transmission device including a traveling transmission mechanism and a PTO transmission mechanism for a work vehicle such as a tractor.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a transmission system for a work vehicle including a travel system transmission mechanism in which a high / low switching device and a three-stage multi-speed transmission mechanism including a reverse gear are connected in series and a two-stage PTO transmission mechanism are known. ing. For example, the technique disclosed in Japanese Utility Model Publication No. 63-166836. In this technology, the multi-stage transmission mechanism has a lever guide including a reverse gear and a lever guide of the PTO transmission mechanism on one side of the seat and is arranged in front of and behind the fuselage.
[0003]
[Problems to be solved by the invention]
With such a configuration, since the multi-stage transmission mechanism includes a reverse gear, the lever guide is H-shaped and pivots not only in the front-rear direction but also in the lateral direction, resulting in poor operability. Further, if the number of speed steps of the PTO transmission mechanism is increased, the lever guide can only be extended to the rear of the seat, resulting in poor operability.
[0004]
[Means for Solving the Problems]
The present invention uses the following means in order to solve the above problems.
In claim 1, a traveling vehicle transmission mechanism comprising a forward / reverse switching mechanism C and a multi-stage transmission mechanism B connected in series, and a multi-stage PTO transmission mechanism A, a transmission for a work vehicle, An input shaft 26 to which power from the engine is input, a first transmission shaft 34 parallel to the input shaft 26, and a PTO transmission shaft 29 that is concentric with the input shaft 26 and supported so as to be relatively rotatable are provided. A PTO transmission mechanism A is configured among the input shaft 26, the first transmission shaft 34, and the PTO transmission shaft 29 , and the second transmission shaft 41, the third transmission shaft 49, and the fourth transmission shaft 34 with respect to the first transmission shaft 34. A transmission shaft 56 is arranged in parallel, and the forward / reverse switching mechanism C is configured between the first transmission shaft 34 and the second transmission shaft 41, and between the third transmission shaft 49 and the fourth transmission shaft 56. The multi-stage speed change mechanism B is configured, and the forward / reverse switching mechanism C is configured as a column shift type. 7 is arranged on the left or right side of the handle 5, and the multi-stage transmission mechanism B is configured such that the clutch slider 61 is linearly slid in the axial direction of the transmission shaft by the lever 14 to transmit a plurality of stages of power. In the PTO transmission mechanism A, the clutch slider 32 is linearly slid in the direction of the transmission shaft by the lever 15 to transmit the forward and reverse powers. The multi-stage transmission mechanism B and the PTO transmission mechanism A is a straight gear change type in which the clutch slider is linearly slid and engaged with any one of a plurality of gears, and a lever guide 20a for guiding the lever 14 of the multi-stage transmission mechanism B; The lever guide 20b for guiding the lever 15 of the PTO transmission mechanism is arranged on one side of the seat 10 along the front-rear direction of the fuselage and in parallel with each other.
[0005]
According to a second aspect of the present invention, in the work vehicle transmission according to the first aspect, the forward / reverse switching mechanism C is configured to move toward one side between the first transmission shaft 34 and the second transmission shaft 41. Then, the height switching mechanism D is arranged so as to approach the other side between the second transmission shaft 41 and the third transmission shaft 49.
[0006]
[Action]
Next, the operation will be described.
In claim 1, since the lever guides of the multi-stage transmission mechanism and the PTO-type transmission mechanism are parallel to each other, the operation direction is linear along the longitudinal direction of the fuselage, and each operability is maintained even if both mechanisms are multistage. The lever guide length can be taken sufficiently without inferiority.
[0007]
Further, according to the second aspect of the present invention, multi-stage is realized while the traveling system transmission mechanism is compactly integrated.
[0008]
【Example】
Next, an embodiment of the present invention will be described with reference to the drawings.
1 is a plan view of a tractor, FIG. 2 is a plan view of a lever guide of a PTO transmission lever and a lever guide of a multi-stage transmission lever, FIG. 3 is a skeleton diagram of the entire transmission, FIG. 4 is a side sectional view of a transmission case, and FIG. FIG. 6 is a sectional view of a PTO transmission mechanism, and FIG. 6 is a sectional view of a multi-stage transmission mechanism.
[0009]
As shown in FIG. 1, the tractor as a work vehicle houses the engine E in the bonnet 1, and the driving force of the engine E causes the rear wheels 3 and the front wheels 2 to pass through a transmission in the transmission case 4 to be described later. The PTO shaft 6 is driven. A handle 5 is provided on the rear part of the bonnet 1, and a column shift type forward / reverse switching lever 7 and an accelerator lever 8 protrude from the left and right sides of the handle 5. In addition, a position control lever 12 and a depth control lever 13 are disposed on the right side fender 11R of the seat 10, and a PTO speed change lever 15 and a multi-stage speed change lever 14 are disposed on the left side fender 11L of the seat 10. 10 A height shift lever 16 and a front wheel drive on / off lever 17 configured in a floor shift manner are disposed at the front lower part.
[0010]
As shown in FIG. 2, the multi-stage speed change lever 14 and the PTO speed change lever 15 on the fender 11L are positioned on the guide plate 20 with linear lever guides 20a and 20b parallel to the front and rear directions and in the front and rear directions. The multi-stage speed change lever 14 and the PTO speed change lever 15 protrude from the lever guides 20a and 20b, respectively. The lever guide 20b of the PTO speed change lever 15 is provided with reverse shift prevention means so that it cannot be easily shifted to the reverse side. The pin 22 protrudes into the lever guide 20b by the biasing force of the spring 21, and the PTO speed change lever 15 Is prevented from shifting to the reverse rotation position “R”, and by pulling the pin 22, the restraint is released and the reverse rotation position “R” can be shifted. In this embodiment, the multi-stage transmission lever 14 is a four-stage transmission and is provided with a neutral position between the second and third speeds, and the PTO transmission lever 15 is provided with three forward rotations and one reverse rotation. However, the number and position of the first speed, the second speed, and the like are not limited.
[0011]
3 and 4, the configuration of the transmission provided in the transmission case 4 will be described. In the transmission case 4, the input shaft 26, the first transmission shaft 34, the second transmission shaft 41, the third transmission shaft 49, the first transmission shaft 49, The four transmission shafts 56 are horizontally mounted, and the power from the engine E is transmitted to the input shaft 26 via the main clutch 25. A forward / reverse switching mechanism C is configured as follows on the rear side between the first transmission shaft 34 and the second transmission shaft 41. That is, the first transmission shaft 34 is provided with a forward fixed gear 35 and a reverse fixed gear 39, the second transmission shaft 41 is an idle gear 43 that meshes with the forward fixed gear 35, and the reverse fixed gear. An idler gear 42 meshing with the intermediate gear 39 via an intermediate gear 40 is provided. On the second transmission shaft 41 between the idle gears 42 and 43, a clutch slider 44 of a cone type synchronous clutch that is not rotatable relative to the shaft 41 and is slidable in the axial direction is disposed. The clutch slider 44 engages one of the reverse gears 42, 43 with the second transmission shaft 41 by the shifting operation of the forward / reverse switching lever 7, so that the forward / reverse power is transmitted to the second transmission shaft 41. It is configured as follows.
[0012]
Further, the elevation switching mechanism D is configured as follows on the front side between the second transmission shaft 41 and the third transmission shaft 49. That is, the second transmission shaft 41 is provided with a low-speed idle gear 45 and a high-speed idle gear 46, and the third transmission shaft 49 is fixed to the fixed gear 50 that meshes with the low-speed idle gear 45 and the high-speed idle gear 46. A fixed gear 51 that meshes with the rolling gear 46 is provided. On the second transmission shaft 41 between the idle gears 45, 46, a clutch slider 47 that is not rotatable relative to the shaft 41 and is slidable in the axial direction is disposed, so that the height switching lever 16 can be moved. The clutch slider 47 is configured to engage either one of the idle gears 45, 46 with the second transmission shaft 41 by a shift operation so that high and low speed power is transmitted to the third transmission shaft 49.
[0013]
Further, the multi-stage transmission mechanism B is configured between the third transmission shaft 49 and the fourth transmission shaft 56 as follows. That is, the third transmission shaft 49 is provided with a second speed fixed gear 55, a first speed fixed gear 54, a fourth speed fixed gear 53, and a third speed fixed gear 52 in order from the right side of the drawing. The fourth transmission shaft 56 is provided with idle gears 60, 59, 58, 57 that mesh with the fixed gears 55, 54, 53, 52 described above. On the fourth transmission shaft 56 between the idle gears 59, 58, a clutch slider 61 that is not rotatable relative to the shaft 56 and is slidable in the axial direction is disposed, and the multi-stage speed change lever is provided. 14, the clutch slider 61 is slid linearly, and the clutch slider 61 engages any one of the four idle gears 59, 60, 57, 58 with the fourth transmission shaft 56. Thus, the power from the first speed to the fourth speed is transmitted to the fourth transmission shaft 56, and the straight gear change type multi-stage transmission mechanism B is configured. The forward / reverse switching mechanism C, the elevation switching mechanism D, and the multi-stage transmission mechanism B are connected in series, and a traveling system transmission mechanism is configured in the mission case 4.
[0014]
Further, a PTO transmission shaft 29 parallel to the first transmission shaft 34 is laid horizontally on the shaft end of the input shaft 26 so as to be relatively rotatable, and a PTO transmission speed change is made between the first transmission shaft 34 and the PTO transmission shaft 29. The mechanism A is configured as follows. That is, the first transmission shaft 34 is provided with a forward second speed fixed gear that is also used by the fixed gear 35, a forward first speed fixed gear 36, and a reverse fixed gear 38. An idle gear 30 that meshes with the forward rotation second speed fixed gear 35, an idle gear 31 that meshes with the forward rotation first speed fixed gear 36, and an idle gear 27 that meshes with the reverse rotation fixed gear 38 via the intermediate gear 33. The engaging teeth 26b that rotate integrally with the input shaft 26 are disposed at the end of the PTO transmission shaft 29 so as to be relatively rotatable. On the PTO transmission shaft 29 between the idle gears 36 and 27, a clutch slider 32 that is not rotatable relative to the shaft 29 and is slidable in the axial direction is disposed. The clutch slider 32 is slid by the movement, and the clutch slider 32 engages one of the idle gears 30, 31, 27 and the engaging teeth 26b with the PTO speed change shaft 29, so that the first forward speed, The second-speed, third-speed and reverse rotation power is transmitted to the PTO transmission shaft 29, and a straight change type PTO transmission mechanism A is configured.
[0015]
As shown in FIG. 5, the details of the PTO transmission mechanism are provided with an input gear 26a and a PTO engagement tooth 26b at the rear of the input shaft 26, and between the input gear 26a and the engagement tooth 26b. The idle gear 27 is installed. A recess is formed at the center of the rear end of the input shaft 26 and the front end of the PTO transmission shaft 29 is rotatably fitted. A spline portion 29 a is formed on the PTO transmission shaft 29. The engaging teeth 26b are adjacent to one side of the spline portion 29a. The idle gear 30 is provided with a boss portion, and an engagement tooth 30a is formed at the end of the boss portion so as to be adjacent to the spline portion 29a. The idle gear 31 is installed on the boss portion of the idle gear 30. The idle gears 27 and 31 are provided with engagement teeth 27a and 31a, respectively. The spline portion 29a slides in an axial direction the clutch slider 32 having inner teeth 32a meshable with the engagement teeth 26b, 30a and outer teeth 32b, 32c meshable with the engagement teeth 27a, 31a. Fits freely.
[0016]
The input gear 26 a meshes with a gear 37 on the first transmission shaft 34 to transmit engine power to the first transmission shaft 34. When the PTO speed change lever 15 is linearly shifted to slide the clutch slider 32 and the inner teeth 32a are engaged with the engaging teeth 30a, the input gear 26a of the input shaft 26 is changed from the gear 37 to the first transmission shaft. 34 → Gear 35 → Gear 30 → Clutch slider 32 → Spline portion 29a → PTO speed change shaft 29 is transmitted to the PTO speed change “forward 1st speed”.
[0017]
Similarly, when the external teeth 32c of the clutch slider 32 are engaged with the engaging teeth 31a, the gear 37 → the first transmission shaft 34 → the gear 36 → the gear 31 → the clutch slider 32 → the spline portion 29a → the PTO transmission shaft 29 from the input gear 26a. Is transmitted and the PTO gear shift is set to “second forward speed”. Similarly, when the inner teeth 32a of the clutch slider 32 are engaged with the engaging teeth 26b, the input shaft 26 is transmitted to the PTO speed change shaft 29 via the clutch slider 32, so that the PTO speed change is “third forward speed”. Similarly, when the external teeth 32b of the clutch slider 32 are engaged with the engaging teeth 27a, the gear 37 → the first transmission shaft 34 → the gear 38 → the intermediate gear 33 → the gear 27 → the clutch slider 32 → the spline portion 29a → This is transmitted to the PTO speed change shaft 29, and the PTO speed change “reverse (R)” is made.
[0018]
As shown in FIG. 6, the details of the multi-stage transmission mechanism described above are such that a spline collar 56 a is fixed on the fourth transmission shaft 56 so as not to be relatively rotatable, and on one side and the other side of the spline collar 56 a, Engagement teeth 57a and 60a carved at the ends of the bosses of the idle gears 57 and 60 are adjacent to each other. The above-mentioned idle gears 58 and 59 are installed on the boss portions of the idle gears 57 and 60, respectively. The idle gears 58 and 59 are provided with engagement teeth 58a and 59a, respectively. The spline collar 56a slides in an axial direction the clutch slider 61 having inner teeth 61a meshable with the engagement teeth 57a and 60a and outer teeth 61b and 61c meshable with the engagement teeth 58a and 59a. Fits freely.
[0019]
Accordingly, when the clutch slider 61 is slid by shifting the multi-stage transmission lever 14 linearly and the outer teeth 61c are engaged with the engaging teeth 59a, the third transmission shaft 49 → the gear 54 → the gear 59 → Clutch slider 61 → spline collar 56a → fourth transmission shaft 56 is transmitted, and “first speed” is obtained. Similarly, when the inner teeth 61a are engaged with the engaging teeth 60a, the third transmission shaft 49 → the gear 55 → the gear 60 → the clutch slider 61 → the spline collar 56a → the fourth transmission shaft 56 is transmitted, and the “second speed” is transmitted. can get. Similarly, when the inner teeth 61a are engaged with the engaging teeth 57b, the third transmission shaft 49 → the gear 52 → the gear 57 → the clutch slider 61 → the spline collar 56a → the fourth transmission shaft 56 is transmitted, and the “third speed” is transmitted. can get. Similarly, when the outer teeth 61c are engaged with the engaging teeth 58b, the third transmission shaft 49 → the gear 53 → the gear 58 → the clutch slider 61 → the spline collar 56a → the fourth transmission shaft 56 is transmitted, and the “fourth speed” is transmitted. can get.
[0020]
The power transmitted to the fourth transmission shaft 56 in this way is connected to the front wheel drive input shaft 63 via the universal joint 62 from the spline 56b formed at the front end of the fourth transmission shaft 56, as shown in FIG. The front wheel drive input shaft 63 is transmitted to the input shaft 65 of the front differential case DF via the clutch slider 64 and the gear 66 which are slid by the rotation of the front wheel drive on / off lever 17 so that the front wheel 2 can be driven. ing. Further, a pinion 56c is formed at the rear end of the fourth transmission shaft 56, meshed with the ring gear 67 of the rear differential device DR, and the rear wheel 3 is driven via the rear differential device DR. 68 is a differential lock device, and 69 is a brake.
[0021]
【The invention's effect】
Since the present invention is configured as described above, the following effects can be obtained. That is, as in claim 1, in claim 1, a work vehicle constituted by a traveling transmission mechanism in which a forward / reverse switching mechanism C and a multi-stage transmission mechanism B are connected in series, and a multi-stage PTO transmission mechanism A. And a PTO that is supported by the input shaft 26 to which power from the engine is input, a first transmission shaft 34 that is parallel to the input shaft 26, and that is coaxial with the input shaft 26 and relatively rotatable. A transmission shaft 29 is provided, and a PTO transmission mechanism A is configured among the input shaft 26, the first transmission shaft 34, and the PTO transmission shaft 29 , and the second transmission shaft 41, Three transmission shafts 49 and a fourth transmission shaft 56 are arranged in parallel, and the forward / reverse switching mechanism C is configured between the first transmission shaft 34 and the second transmission shaft 41, and the third transmission shaft 49 and the The multi-stage transmission mechanism B is formed between the four transmission shafts 56, and the forward / reverse switching mechanism C is a column shift. The lever 7 is arranged on the left and right sides of the handle 5, and the multi-stage transmission mechanism B is configured such that the clutch slider 61 is linearly slid in the axial direction of the transmission shaft by the lever 14, and a plurality of stages are provided. In this PTO transmission mechanism A, the clutch slider 32 is linearly slid in the direction of the transmission shaft by the lever 15 to transmit forward and reverse power, and the multi-stage transmission mechanism B and the PTO transmission mechanism A are configured as a straight gear change type in which a clutch slider is linearly slid and engaged with any one of a plurality of gears, and the lever 14 of the multi-stage transmission mechanism B is guided. And a lever guide 20b for guiding the lever 15 of the PTO transmission mechanism on one side of the seat 10 along the longitudinal direction of the body and parallel to each other. Having location, the lever and the multi-stage transmission mechanism, and a lever guide for guiding the lever of the PTO transmission mechanism parallel to each other, it is possible to improve the respective operability while realizing a multistage of two mechanisms.
Further, the operability can be further improved by making the forward / reverse switching device a column shift type.
In addition, the PTO transmission mechanism is made compact and the multi-stage is realized, and the entire transmission is made compact.
Furthermore, when the reverse rotation stage is provided as shown in the embodiment, usability is improved in terms of workability in addition to improvement in operability. In that case, the reverse operation prevention means is provided in the lever guide of the PTO speed change lever to prevent erroneous operation even in the straight change type.
[0022]
As in claim 2, the forward / reverse switching mechanism C is configured so as to approach one side between the first transmission shaft 34 and the second transmission shaft 41, and the second transmission shaft 41 and the third transmission shaft C. Since the high / low switching mechanism D is arranged so as to move toward the other side between the shafts 49, multi-stages can be realized while the traveling system speed change mechanism is made compact.
[Brief description of the drawings]
FIG. 1 is a plan view of a tractor.
FIG. 2 is a plan view of a lever guide for a PTO transmission lever and a lever guide for a multi-stage transmission lever.
FIG. 3 is a skeleton diagram of the entire transmission.
FIG. 4 is a side sectional view of a mission case.
FIG. 5 is a cross-sectional view of a PTO transmission mechanism.
FIG. 6 is a sectional view of a multi-stage transmission mechanism.
[Explanation of symbols]
A PTO transmission mechanism B Multi-stage transmission mechanism C Forward / backward switching mechanism D Height switching mechanism 4 Mission case 10 Seat 14 Multi-stage transmission lever 15 PTO transmission lever 20a, 20b Lever guide 29 PTO transmission shaft 32 Clutch slider 61 Clutch slider

Claims (2)

A transmission system for a work vehicle including a traveling transmission mechanism in which a forward / reverse switching mechanism C and a multi-stage transmission mechanism B are connected in series, and a multi-stage PTO transmission mechanism A;
An input shaft 26 to which power from the engine is input, a first transmission shaft 34 parallel to the input shaft 26, and a PTO transmission shaft 29 that is concentric with the input shaft 26 and supported so as to be relatively rotatable are provided. A PTO transmission mechanism A is configured between the input shaft 26, the first transmission shaft 34, and the PTO transmission shaft 29 ,
A second transmission shaft 41, a third transmission shaft 49, and a fourth transmission shaft 56 are arranged in parallel to the first transmission shaft 34, and the first transmission shaft 34 and the second transmission shaft 41 are arranged between the first transmission shaft 34 and the second transmission shaft 41. A forward / reverse switching mechanism C is configured, and the multi-stage transmission mechanism B is configured between the third transmission shaft 49 and the fourth transmission shaft 56,
The forward / reverse switching mechanism C is configured as a column shift type, and the lever 7 is arranged on one of the left and right sides of the handle 5. The multi-stage transmission mechanism B is configured such that the clutch slider 61 is linearly moved in the axial direction of the transmission shaft by the lever 14. The PTO transmission mechanism A is configured such that the clutch slider 32 is linearly slid in the direction of the transmission shaft by the lever 15 to transmit forward and reverse power. To communicate,
The multi-stage transmission mechanism B and the PTO transmission mechanism A are configured as a straight gear change type in which a clutch slider is linearly slid and engaged with any one of a plurality of gears.
A lever guide 20a for guiding the lever 14 of the multi-stage transmission mechanism B and a lever guide 20b for guiding the lever 15 of the PTO transmission mechanism on one side of the seat 10 along the longitudinal direction of the body, And the transmission of the working vehicle characterized by arrange | positioning so that it may mutually parallel.   2. The transmission for a work vehicle according to claim 1, wherein the forward / reverse switching mechanism C is configured to move toward one side between the first transmission shaft 34 and the second transmission shaft 41, and the second transmission is provided. A transmission for a work vehicle, characterized in that a high / low switching mechanism D is arranged between the shaft 41 and the third transmission shaft 49 so as to approach the other side.

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