FR3064586A1 - TRACTOR INCLUDING A ARM LINKAGE MECHANISM ACTIVATED BY LOCKING BY A PARKING LEVER - Google Patents

Abstract

According to one embodiment, a tractor includes: an arm linkage mechanism (25) engageable with an actuating arm (24) that allows a brake mechanism (17) to perform brake actuation by pressing a brake pedal (28), the arm linkage mechanism (25) being formed to be actuated in engagement by actuation of a parking lever (35) via a linkage mechanism of parking (38), wherein the parking lever (35) is supported on one side of a seat support (36), and the parking linkage mechanism (38) is provided with a plurality of pivot shafts (43, 44), the plurality of pivot shafts (43, 44) being provided in the seat support (36).

Description

Holder (s): ISEKI & CO., LTD.

Extension request (s)

Agent (s): BREVALEX.

TRACTOR INCLUDING A ARM LINK MECHANISM ACTIVATED BY A PARKING LEVER.

FR 3,064,586 - A1 (5 /) According to one embodiment, a tractor includes: an arm linkage mechanism (25) capable of engaging with an actuating arm (24) which allows a brake mechanism (17) effecting a brake actuation by depressing a brake pedal (28), the arm linkage mechanism (25) being formed to be actuated in engagement by actuation of a parking lever (35) by through a parking linkage mechanism (38), wherein the parking lever (35) is supported on one side of a seat support (36), and the parking linkage mechanism (38) is provided with a plurality of pivot shafts (43, 44), the plurality of pivot shafts (43, 44) being provided in the seat support (36).

i

Tractor including an arm linkage mechanism actuated by a parking lever

Context

Field of the invention

The present invention relates to a work vehicle such as an agricultural tractor, and particularly a brake engagement configuration which is provided with a parking brake.

Description of Related Art

In the related art, as a configuration for connecting both a parking lever and a brake pedal in a brake device of an agricultural tractor, there is disclosed a configuration in which right brake actuation rods and left are arranged on both sides of a transmission case, the front portion is connected to the brake pedal, and the rear portion is connected to right and left brake mechanisms (JP-A-2008-273367). In this configuration, a horizontal interlocking shaft is arranged on the lower side of the transmission housing. A lower portion of an arm, the upper portion of which is connected to the brake actuating rod, is pivotally attached to the horizontal engagement shaft. An actuating arm connected to the parking lever is operatively linked to the brake actuating rod on one side. An actuating force is transferred to the brake actuating rod on one side when the actuating arm is actuated to a brake system by the parking lever. The actuating force is transferred to brake the brake actuating rod on the other side via the horizontal engaging shaft and the actuating arm on the other side.

According to the configuration disclosed in JP-A-2008-273367, an intense arrangement of the brake pedal and the parking lever is avoided, and two actuation systems can be arranged in separate positions. However, due to the fact that the horizontal interlocking shaft is arranged on the lower side of the transmission housing, there is a concern for breaking, and a linkage element for actuating a brake actuation rod from the parking lever is lying down. So the configuration becomes complicated.

summary

The invention includes the following technical ideas for solving the above problems.

According to a first aspect of the invention, a tractor is proposed including: an arm linkage mechanism 25 capable of engaging with an actuation arm 24 which allows a brake mechanism 17 to effect brake actuation by depressing a brake pedal 28, the arm linkage mechanism 25 being formed to be actuated into engagement by actuation of a parking lever 35 via a parking linkage mechanism 38, wherein the lever 35 is supported on one side of a seat support 36, and the parking linkage mechanism 38 is provided with a plurality of pivot shafts 43, 44, the plurality of pivot shafts 43, 44 being provided in seat support 36.

According to a second aspect of the invention, in the tractor according to the first aspect, a pivot shaft 44 among the plurality of pivot shafts 43, 44 may be provided along a width on the right and left sides of a transmission case 5, and right and left ends of the pivot shaft 44 can be engaged to a right arm linkage mechanism and a left arm linkage mechanism included in the arm linkage mechanism 25, respectively.

According to a third aspect of the invention, in the tractor according to the second aspect, the plurality of pivot shafts 43,44 can be arranged at a predetermined interval forwards and backwards, the parking lever 35 and a first pivot shaft 43 can be engaged by a first engagement rod 39, a second pivot shaft 44 and the right and left arm linkage mechanisms 25 can be engaged by second right and left engagement rods 40 respectively , the first pivot shaft 43 and the second pivot shaft 44 can be engaged by a first connecting rod mechanism 41, and one of the second engagement rods 40 can perform a reciprocating movement through a rotation of the second pivot shaft 44.

According to a fourth aspect of the invention, in the tractor according to the third aspect, the right and left arm linkage mechanisms 25 can connect the actuation arm 24 near the brake mechanism 17 and an actuation rod brake 26, are provided with a relay arm 32 intended to be engaged with one of the second engaging rods 40 by means of a second connecting rod mechanism 42, rotate the relay arm 32 by actuation of one of the second engaging rods 40, and allow the brake actuating rod 26 to engage the brake mechanism 17 at a braking side.

According to a fifth aspect of the invention, in the tractor according to the fourth aspect, the second connecting rod mechanism 42 can be provided with an engaging pin 46 which passes through and is fixed to a lower end of one of the second engagement rods 40 and a driven relay arm 32a which is provided integrally with the relay arm 32, and the engagement pin 46 can pass through a long hole 32b which is formed at one end of the driven relay arm 32a.

According to a sixth aspect of the invention, in the tractor according to the fifth aspect,

The interlocking pin 46 can be provided on a lower end side of one of the second interlocking rods 40 so that a position of the interlocking pin 46 can be adjusted along the one of the second interlocking rods 40.

According to the invention, when the arm linkage mechanism 25 is engaged

5 with the parking lever 35, a plurality of pivot shafts 43, 44 are arranged in a seat support 36, the plurality of pivot shafts 43, 44 being interposed between the arm linkage mechanism 25 and the lever 35 and interlocked with each other. So, it is possible to reduce the damage, and to use an empty space for the assembly work.

Even when the installation space is smaller due to various types of auxiliary elements (for example, hydraulic hose and various types of valves) in a side surface of the transmission case, it is sufficient to guarantee the space d installation substantially along a longitudinal direction of the second interlocking rod 40, whereby flexibility of design can be guaranteed.

Adjustment work from the lateral surface of a body 1 can be easily carried out, and can be implemented without problem even when a rear wheel 3 is mounted.

Brief description of the drawings

The present invention will be better understood from the detailed description provided below and from the accompanying drawings which are provided by way of illustration only, and thus are not limiting of the present invention and in which:

Figure 1 is a side view of an agricultural tractor;

Figure 2 is a top view of a transmission housing;

Figure 3 is a side view illustrating the transmission case and a peripheral structure;

Figure 4A is a perspective view illustrating a right brake engagement mechanism and Figure 4B is a perspective view illustrating a left brake engagement mechanism;

Figure 5 is a side view illustrating a parking linkage mechanism;

Figure 6A is a rear view illustrating the parking linkage mechanism and Figure 6B is a bottom view illustrating the parking linkage mechanism;

Figure 7 is a perspective view illustrating the parking linkage mechanism;

Figure 8A is an enlarged front view illustrating the parking linkage mechanism and Figure 8B is an enlarged side view illustrating the parking linkage mechanism; and Figure 9 is a cross-sectional view illustrating a watertight configuration of the actuating arm of a brake mechanism.

Detailed description of the invention

In the following, embodiments of the invention will be described in detail on the basis of the drawings.

An agricultural tractor used as a work vehicle that performs work in the fields while being self-powered. The agricultural tractor is provided with right and left front wheels 2L and 2R which are driven and oriented on the front side of a body 1, right and left rear wheels 3L and 3R which are mounted on the rear side of body 1, a motor 4 which serves as a power source, and a transmission casing 5 in which a transmission is mounted inside. The L symbol indicates a left side and the R symbol a right side in a pair of right and left elements.

In the rear portion of the body 1 is arranged a linkage device 7 in which a working machine 6 such as a rotary element can be mounted. The linkage device 7 is a three-point linkage structure which is configured by an upper linkage 7a in the upper central portion and lower right and left linkages 7b and 7b in the lower portion. The lower linkage 7b is rotated by hydraulically rotating a lifting arm 8 via lifting rods 9 and 9 in order to move the working machine 6 up and down.

A cabin 11 of the tractor 1 covers an operator seat 10 on the bodywork. In the cabin 11, a steering wheel 13 rises from a dashboard 12 on the front side of the operator seat 10. Various types of operating pedals such as a clutch pedal 14, a brake pedal, accelerator, and various operating levers such as a front / rear lever and a gear shift lever are disposed in the vicinity of the operator seat 10.

A transmission mechanism is arranged in the transmission housing 5. With regard to the transmission mechanism, the power of the motor 4 is transferred to a rear wheel differential gear 15 via a front / rear permutation mechanism , a main transmission mechanism, and an auxiliary transmission mechanism which are well known. Right and left brake mechanisms 17L and 17R are provided at the two ends of the right and left differential gear output shafts 16L and 16R. Final speed reduction mechanisms 19L and 19R are configured by combining flat gears between the right and left differential gear output shafts 16L and 16R and rear vehicle shafts 18L and 18R which support the right and left rear wheels 3L and 3R.

The description will be given in detail with regard to the configuration and the engagement configuration of the right and left brake mechanisms 17L and 17R. The right and left brake mechanisms 17L and 17R are configured in common, and so will be described correctly by omitting the symbols “L” and “R” indicating the right and left sides. The brake mechanism 17 is configured by a pair of brake disc groups 20a and 20b which are engaged with the differential gear output shaft 16 and can slide in an axial direction, a pair of brake cam discs 21a and 21b which are provided between the pair of brake disc groups 20a and 20b, and a cam mechanism 22 which is made of a cam groove and a bolt 5 between the pair of brake cam discs 21a and 21b. The pair of brake cam discs 21a and 21b are provided with projecting bands 21c and 21d on the front side, and pull forward the central portion of a cam actuating rod 23 connecting the two projecting bands 21c and 21d for rotating the brake cam discs 21a and 21b in opposite directions, so as to be compressed and extended by the cam mechanism 22. The groups of brake discs 20a and 20b are configured to be compressed towards a fixed wall in order to brake the differential gear output shaft 16.

An actuating arm 24 is connected to the central portion of the cam actuating rod 23 of the brake mechanism 17, and connected to a brake actuating rod 26 which extends towards the front side along the lateral surface of the transmission casing 5 via a relay arm linkage mechanism 25. The front end of the brake actuation rod 26 is connected to an L-shaped arm 27 which is supported on the lateral surface of the transmission housing 5. The brake actuating rod 26 is pulled towards the front side when the L-shaped arm 27 is rotated in a clockwise direction in FIG. 3 together with the action of depressing a brake pedal 28. The brake mechanism 17 is actuated towards a braking system via the arm linkage mechanism 25 and the actuating arm 24. A pair of the brake pedals 28 is provided on the right and left sides e to brake the right and left brake mechanisms 17L and 17R independently, and can actuate a left brake engagement rod 27L and a right brake engagement rod 27R.

The arm linkage mechanism 25 will be described. As illustrated in Figures 4A and 4B, a support plate 30 is detachably attached to a rear axle housing 29 which stores the differential gear output shaft 16, the brake mechanism 17, the rear vehicle shaft 18, and the final speed reduction mechanism 19. A U-shaped connecting piece 24a is provided in the front end of the actuating arm 24 which passes through a through hole 30a formed in the plate of support 30. A U-shaped connecting piece 26a is provided at the rear end of a brake actuating rod 26. These two U-shaped connecting pieces 24a and 26a are rotatably connected l to one another. In addition, a connecting pin 31 connecting the two connecting pieces passes through a relay arm 32 which is engaged to a parking linkage mechanism for a parking lever described below. The relay arm 32 is intended to be rotatable around a pivot pin 33 which is connected to the support plate 30. In other words, a boss portion 32c of the relay arm 32 is loosely installed on the pin. pivot 33 to be rotatable about the pivot pin 33. Therefore, the U-shaped connecting piece 26a of the brake actuating rod 26 and the relay arm 32 which form the arm linkage mechanism 25 are actuated to pull the actuating arm 24, and brake the brake mechanism 17. The configurations other than the linkage mechanisms 25L and 25R are supplied separately to the right and left brake mechanisms 17L and 17R, so that the right and left 17L and 17R are configured to be braked independently of each other.

Now, a brake configuration of a parking lever 35 will be described based on Figures 3, and 5 to 8B. The parking lever 35 is rotatably supported by a support shaft 37 on one side (the right side in the drawing) of a seat support 36 which is disposed in the upper portion of the transmission housing 5. The lever parking 35 is configured to be rotatable around the support shaft 37. When actuated to move upward a gripping portion 35a, the parking lever 35 can actuate the brake mechanism 17 towards the braking system jointly with the relay arm 32 of the linkage mechanism 25 via a parking linkage mechanism 38.

In the parking linkage mechanism 38, two interlocking rods 39 and 40, a first connecting rod mechanism 41 which is interposed between the interlocking rods 39 and 40, and a second connecting rod mechanism 42 which is interposed between the rod lower engagement 40 (a second engagement rod) and the relay arm 32 are disposed between the parking lever 35 and the relay arm 32 of the arm linkage mechanism 25. The upper end of the link rod engagement 39 (the first engagement rod) is connected between the support shaft 37 of the parking lever 35 and the gripping portion 35a. In the seat support 36 and on the upper side of the transmission housing 5, the first connecting rod mechanism 41 is provided with the pivot shaft 43 (a first pivot shaft) on the upper front side and the shaft pivot 44 (a second pivot shaft) on the lower rear side. A parallel connecting rod 45 is configured to connect these two pivot shafts 43 and 44. An extension arm 45b is provided to extend towards a parallel connecting rod arm 45c provided on one side near the pivot shaft 43. L the lower end of the upper engagement rod 39 (the first engagement rod) is connected to the extension arm 45b. On the other hand, an arm 45d extending towards the parallel connecting rod arm 45c provided on one side near the pivot shaft 44 (the second pivot shaft) is connected to the lower engagement rod 40 (the second rod ). At the lower end of the lower interlocking rod 40 (the second interlocking rod), a different-diameter interlocking pin 46 formed with a through hole passes through to the lower interlocking rod 40 ( the second interlocking rod), and a long screw nut 50 and a fixing nut 51 are screwed sequentially with the lower interlocking rod 40 (the second interlocking rod) in the lower portion. In this configuration, a small diameter portion end piece 46a of the locking pin of different diameter 46 passes through a long hole 32b formed at the end of a driven relay arm 32a provided in one piece with the arm of relay 32, so that the second connecting rod mechanism 42 is formed. In other words, the second connecting rod mechanism 42 is configured by the boss portion 32c which loosely installs the relay arm 32 to be rotatable around the pivot pin 33, the driven relay arm 32a which is intended to extend in the rear direction of the body 1 together with the boss portion 32c, and the locking pin of different diameter 46. In the driven relay arm 32a, the long hole 32b is formed along a vertical direction for pass through the locking pin of different diameter 46. Therefore, even when the braking system of the brake actuating rod 26 is actuated to brake the relay arm 32 (rotation around the pivot pin 33), the actuating force is not transferred to the parking linkage mechanism 38, apart from the locking rod 40.

The long screw nut 50 and the fixing nut 51 can be suitably adjusted to be loosened along the rod body. The adjusted position becomes the lower limit position of the locking pin of different diameter 46. Therefore, the braking operation is carried out by pulling up the locking rod 40, and a braking instant and a braking force can be adjusted by adjusting the lower limit position. A balance between right and left braking forces can also be easily considered. Specifically, the position of the locking pin of different diameter 46 relative to the long hole 32b of the driven relay arm 32a is determined by reversing the long screw nut 50, and is adjusted by a fixing nut 48. The position of the long hole 32b and the position of the relay arm 32 are influenced by a relation to the actuating rod of the brake 26, but can be adjusted in conjunction with the adjustment of the action of depressing the pedal. brake 28.

In pivot shafts 43 and 44, the pivot shaft 44 (the second pivot shaft) on the lower rear side extends to the opposite side (the left side in the drawing) in the upper surface of the transmission case 5. The configuration below the lower engagement rod 40 (the second engagement rod) is asymmetric in pairs in order to brake the left brake mechanism 17L on the opposite side (the left side). By explaining in detail, a base support 47 formed along the width on the right and left sides of the housing 5 in the upper surface of the transmission housing is detachably attached. An elevated support portion 47a is formed on one side (the right side in the drawing) of the right and left sides to support the pivot shaft 43 (the first pivot shaft) of the front upper portion in the support shaft 43 and 44. The pivot shaft 43 is fixedly formed to fix the axial center horizontally to the raised support portion 47a. A first boss portion 45A provided with the parallel connecting rod arm 45a and the arm 45b is installed loosely to be rotated. The other pivot shaft 44 (the second pivot shaft) is intended to be installed loosely on a cylindrical fixing shaft 49 which is provided horizontally and detachably on the base support 47 by means of a pair of support elements 49a and 49a. On the two ends of the pivot shaft 44 (the second pivot shaft), the parallel connecting rod arm 45c and the arm 45d extending towards the parallel connecting rod arm 45c are respectively provided on the two right and left ends of the lower engagement rod 40 (the second engagement rod) of the right and left brake mechanisms 17L and 17R.

With this configuration, in case a direction adjustment or a headland turn is made during work in the fields, you press any of the right and left brake pedals 28L and 28R to brake the corresponding mechanism of the mechanisms brake 17L and 17R. The L-shaped arm 27 is pulled by pressing the brake pedal 28, and the actuating arm 24 is pulled through the brake actuating rod 26. Therefore, the brake mechanism 17 is braked . At the same time, the relay arm 32 rotates to the front side in connection with the brake actuating rod 26 or the actuating arm 24. However, as described above, a long hole 32c is formed in the driven relay arm 32a, so that the parking lever 35 is not randomly actuated without influencing the movement of the relay arm 32 and without transferring force to the parking linkage mechanism 38, apart from the rod d engagement 40.

On the other hand, when the bodywork 1 is stopped, the parking lever 35 is pulled upward to prevent unexpected movement. The relay arm 32 can be rotated through the parking linkage mechanism 38, and the actuation arm 24 can be actuated toward the braking system. In other words, the interlocking rod 39 (the first interlocking rod) is pulled up by the rotation of the parking lever 35. The lower interlocking rod 40 (the second interlocking rod) is pulled towards the top via the parallel rod 45. An upward pulling force is applied to one or the other of the upper engagement rod 39 (the first engagement rod) and of the lower engagement 40 (the second engagement rod) substantially along an axial center of the rod. In addition, the interlocking rods 39 and 40 can be moved forward and backward by interposing the parallel rod 45, and can be reasonably arranged in locations which are limited in installation. This is due to the fact that a connection point p to the parking lever 35 of the upper engagement rod 39 (the first engagement rod) and a connection point q at the lower end of the rod d 'upper engagement 39 (the first engagement rod) relative to the support 45b extending towards the parallel connecting rod support 45a provided near the pivot shaft 43 are arranged almost in the vertical direction, and the any of the connection points p and q and a range of back-and-forth vibrations of the parallel rod 45 are set to be almost in the vertical direction, and thus the interlocking rod 39 moves upward and toward the bottom almost in the longitudinal direction and the amplitude of the back and forth can be adjusted to be extremely small. Similarly, a connection point r to the support 45d of the parallel connecting rod support 45c in the lower engagement rod 40 (the second engagement rod) is disposed almost in the vertical direction relative to a point of connections to the driven relay arm 32a of the locking pin of different diameter 46. The lower locking rod 40 can move vertically almost in the longitudinal direction.

On the lower end side of the lower interlocking rod 40 (the second interlocking rod), the interlocking pin of different diameter 46 is engaged with the upper portion of the long hole 32b formed at the end of the driven support 32a to rotate the driven support 32a, and rotates the relay arm 32 towards the braking system (the front side in the drawing). The brake actuating rod 26 connected by the rotation of the relay arm 32 is compressed towards the front side. A long hole 26b is formed in the U-shaped connecting piece 26a which connects the L-shaped arm 27 and the brake actuating rod 26. Even when the brake actuating rod 26 is compressed towards the before as described above, the force is not transferred to the L-shaped arm 27.

In the lower interlocking rod 40 (the second interlocking rod) of the parking linkage mechanism 38, the position of the different-diameter interlocking pin 46 relative to the interlocking rod 40 is adjusted by the long screw nut 50 and fixing nut 51. A state in engagement between the locking pin of different diameter 46 and the relay arm 32a can be adjusted by adjusting a fixed position of the screw nut 50 relative to to the engaging rod 40, and a braking force when the parking lever 35 is pulled up can be adjusted appropriately. A length adjustment element such as a lantern tensioner can be provided in the intermediate portion of the interlocking rod 40 in addition to the case of

5 the lower end of the engaging rod 40, and the braking force can be adjusted. Incidentally, since the long screw nut 50 and the fixing nut 51 are disposed in the lower end of the interlocking rod 40 in the case of the above embodiment, the tire is not not removed and, for example, tools can easily approach these nuts from the lower side of the body 1, so that adjustment work can be facilitated even after the tire is mounted in the rear wheel 3.

FIG. 9 illustrates an improved configuration of mud protection and watertightness of the actuating arm 24 of the brake mechanism 17. A flexible rubber casing 54 is mounted for mud protection and sealing at the water. Specifically, the flexible casing 54 is inserted into the through hole 30a of the support plate 30 from the rear side to the front side, and an installation hole 30b having the same diameter which is formed with a rear end flange 54a in the peripheral portion of the through hole 30a of the support plate 30 is formed and mounted to be adjusted in position.

An O-ring 55 which indicates the front end side of the actuating arm 24 is interposed between the flexible casing 54 and the actuating arm 24, and a collar 56 and a fixing nut 57 are provided to prevent tip of the casing tip to be deflected or rubbed, and also to prevent oil leakage.

Claims (6)

1. Tractor, including: an arm linkage mechanism (25) capable of engaging with an actuation arm (24) which allows a brake mechanism (17) to effect brake actuation by depressing a brake pedal (28) , the mechanism of 5 linkage arms (25) being formed to be engaged in engagement by actuation of a parking lever (35) via a parking linkage mechanism (38), wherein the parking lever (35 ) is supported on one side of a seat support (36), and The parking linkage mechanism (38) is provided with a plurality of pivot shafts (43,44), the plurality of pivot shafts (43, 44) being provided in the seat support (36) . 2. Tractor according to claim 1, 15 characterized in that a pivot shaft (44) among the plurality of pivot shafts (43, 44) is provided along a width on right and left sides of a transmission housing (5), and right and left ends of the pivot shaft (44) are engaged to a right arm linkage mechanism and a left arm linkage mechanism included in the 20 linkage arms (25), respectively. 3. Tractor according to claim 2, characterized in that the plurality of pivot shafts (43, 44) are arranged at a predetermined interval forwards and backwards, the lever 25 parking (35) and a first pivot shaft (43) are engaged by a first engagement rod (39), a second pivot shaft (44) and the right and left arm linkage mechanisms (25) are engaged by second right and left engagement rods (40) respectively, the first pivot shaft (43) and the second pivot shaft (44) are engaged by a first connecting rod mechanism (41), and one of the second interlocking rods (40) reciprocates through 5 of a rotation of the second pivot shaft (44). 4. Tractor according to claim 3, characterized in that the linkage mechanisms of right and left arm (25) connect the actuating arm (24) near the mechanism of 10 brake (17) and a brake actuating rod (26) are provided with a relay arm (32) intended to be engaged to one of the second engaging rods (40) via '' a second connecting rod mechanism (42), rotate the relay arm (32) by actuation of one of the second interlocking rods (40), and allow the actuation rod to 15 brake (26) to engage the brake mechanism (17) at a braking side. 5. Tractor according to claim 4, characterized in that the second connecting rod mechanism (42) is provided with an interlocking pin (46) which passes through and is fixed at one end Bottom 20 of one of the second interlocking rods (40) and of a driven relay arm (32a) which is provided in a single piece with the relay arm (32), and the interlocking pin (46) passes through a long hole (32b) which is formed at one end of the driven relay arm (32a). 25 6. Tractor according to claim 5, characterized in that the interlocking pin (46) is provided on a lower end side of one of the second interlocking rods (40) so that a position of the interlocking pin (46) can be adjusted along one of the second interlocking rods (40).