JPH088888Y2 - Front wheel tread adjuster for mobile agricultural machinery - Google Patents

Description

[Detailed Description of the Invention] (a) Industrial field of application The present invention relates to a front wheel tread adjusting device in a mobile agricultural machine such as a tractor. Specifically, a slide pipe having a front wheel attached to one end is freely movable in an axle housing. The present invention relates to a front wheel tread adjusting device configured to slide on and to be fixed at an arbitrary position.

(B) Conventional Technology In general, a mobile agricultural machine such as a tractor has a tread adjusting device configured to appropriately adjust the tread of the front wheels according to the work content.

A front wheel is installed on one end of the slide pipe that freely expands and contracts in the left-right direction of the machine body, and with the slide pipe appropriately extended (or contracted), a large number of positioning grooves formed at predetermined positions on the side surface of the slide pipe. Is pressed and engaged by a pin member inserted and arranged in the pin insertion portion formed on the axle housing side, so that the slide pipe can be fixed at an appropriate position and the tread of the front wheel can be freely adjusted and positioned. The front wheel tread adjustment device configured in
Proposed by the applicant.

(C) Problems to be Solved by the Invention By the way, the front wheel tread adjusting device proposed by the applicant of the present invention presses two arbitrary taper grooves formed in the slide pipe by pressing two taper pins. It can be considered that the front wheels are engaged and fixed to the adjusted position.However, according to this method, since each taper pin tries to make surface contact with each taper groove, one taper pin makes the taper groove surface contact. When the other taper pin is tightened after being pressed and engaged with, the other taper pin and the taper groove do not come into complete surface contact due to processing tolerances, and especially when the tread is enlarged, the slide pipe When the moment acting on is increased and the pressure of the contact portion is increased, the incomplete surface contact portion may be dented, which may cause backlash.

Therefore, the present invention is configured to provide a contact between the taper pin and the positioning groove such that one is a surface contact and the other is a line contact, and an object of the present invention is to provide a tread adjusting device for a mobile agricultural machine that solves the above-mentioned problems. It is what

(D) Means for Solving the Problems The present invention has been made in view of the above circumstances. For example, referring to FIGS. 1 to 3, a slide having a front wheel (32) attached to one end thereof is provided. In the front wheel tread adjusting device of a mobile agricultural machine, which is configured so that the pipe (12) can be freely slid in the axle housing (2) and can be fixed at an arbitrary position, a side surface of the slide pipe (12) is provided. A large number of positioning grooves (19a), (19b), along the axial direction
(19c), (19d) and (19e) are formed, and the axle housing (2) is provided with pin insertion portions (9) and (10) corresponding to arbitrary two positions of the positioning groove. Tapered pins (6) and (7) are inserted and arranged in the pin insertion portion, and further, the plurality of positioning grooves are tapered grooves (19c) and (19d) that are in surface contact with the tapered pins (6) and (7).
And the rounded grooves (19a), (19) that make line contact with the taper pin.
b) and (19e), and one of the two tapered pins contacts the positioning groove formed of the tapered groove, and the other of the tapered pins contacts the positioning groove formed of the rounded groove. Further, the taper pin and the positioning groove are arranged.

(E) Action Based on the above configuration, when tread adjustment of the front wheels (32), (32) is performed, the taper pins (6), (7) are loosened to release the slide pipe (12), and the pipe (12) is released. ) Slide in the right and left direction of the machine. And the pin insertion part (9),
A proper positioning groove is made to correspond to (10), and the taper pins (6) and (7) are tightened in this state. As a result, the taper pins (6) and (7) are brought into pressure contact / engagement with the positioning groove corresponding to one of them by surface contact, and the other taper pin is brought into pressure contact / engagement of the corresponding positioning groove with line contact. . Therefore, for example, even if there is a processing tolerance, one taper pin (for example, 6) comes into surface contact with the taper groove (19c or 19d), and the other taper pin (7) has a round groove (19a, 19b or 19e) surely comes into contact with some part of line 19e by line contact, so that the machining tolerance is absorbed and the slide pipe (12) is positioned without backlash.

The reference numerals in parentheses are for reference to the drawings, but do not limit the configuration in any way, and even the same reference numerals are described based on the scope of claims for utility model registration. It may be different from the name of the embodiment shown below.

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

As shown in FIG. 1, the front axle 1 of a four-wheel drive tractor has an axle housing 2, and the axle housing 2 has a differential device 3 built in its diff chamber and a diff The shaft 5 projects from the differential chamber and is rotatably supported. Then, insert the taper pins 6 and 7 into the protruding portion 2a of the axle housing 2, respectively.
The pin insertion portions 9 and 10 to be arranged are formed with a predetermined space therebetween, and an oil injection port 11 is formed between the pin insertion portions 9 and 10. Support portions 13 and 15 are formed inside the axle housing 2 and the slide pipe 1 is provided.
2 is supported and slidably housed and arranged by the supporting portions 13 and 15 and the like. Further, a key groove 16 is formed on the lower side of the slide pipe 12, and a bolt 17 is screwed into the support portion 13. The tip of the bolt 17 is the key groove 16
The slide pipe 12 is prevented from rotating by being inserted into.

Further, a large number of positioning grooves 19a, 19b, 19c, 19d, 19e are formed on the upper side surface of the slide pipe 12, and the slide pipe 12 is slid to appropriately pin two arbitrary positions of these positioning grooves. The taper pins 6 and 7 are tightened, positioned and fixed in this state in correspondence with the insertion portions 9 and 10. On the other hand, a flange portion 20 is provided at one end of the slide pipe 12, and a kingpin case 21 is bolted to the flange portion 20. Inside the slide pipe 12, a drive pipe 22 has bearings at both ends.
It is rotatably supported via 23 and 24, and the differential shaft 5 is slidably fitted to one end of the drive pipe 22 by a spline 5a. Also, the drive pipe 22
A bevel gear 28 is fixed to the other end of the bevel gear 28, which meshes with the bevel gear 25 in the kingpin case 21, and the bevel gear 25 is linked to the axle 30 via the shaft 26 and the gears 27 and 29. A front wheel 32 is attached to the axle 30 via a disc 31.

Further, a cutout 13a is formed in the support portion 13, and an oil hole 12a is formed below one end of the slide pipe 12, so that the oil injected from the oil injection hole 11 at the time of vehicle assembly is the oil injection hole 11a. It passes through the space 33 continuing to, and the notch of the support 13
13a, the space 35, the oil hole 12a, the gap between the drive pipe 22 and the slide pipe 12, and the gap between the ball and the retainer in the bearing 24 to the kingpin case.
It is designed to flow into the inside of 21. An oil hole 22a is formed on the lower surface of the other end of the drive pipe 22 and an oil hole 36 is formed toward the kingpin case 21 side. Therefore, the drive pipe 22 and the slide pipe 12 described above are formed. The oil that flows in through the gap between the kingpin case 21 and the oil hole 22a and the oil hole 36 is
Is flowed into.

On the other hand, the taper pins 6 and 7 are shown in FIGS. 2 (a) and 2 (b).
As shown in Fig. 1, one end 6a (7a) and the other end 6b (7b) of the cylindrical pin insertion portion 9 (10) are formed in a cylindrical shape, and the central portion thereof is The lower side surface 6c (7c) is formed so as to gradually expand from the right side to the left side and is inclined toward the left side at an angle α.
Further, a ring groove 6d (7d) into which the O-ring is fitted is formed following the other end 6b (7b), and the screw portion 6e (7e) is formed.
Are formed. A washer is attached to the screw portion 6e (7e).
37, 39 are fitted and nut 40 is screwed.

Further, as shown in FIG. 4 (a), the positioning groove formed on the upper side surface of the slide pipe 12 has a center line 41 of a tapered milling cutter 40 having an angle α, which is formed on the slide pipe 12 as shown in FIG.
Tapered grooves 19c and 19d (see FIG. 3 (a)) that are cut parallel to the center line 42 of the cylinder, and as shown in FIG. 4 (b), the center line of the cylindrical end mill 43. It is composed of R (R) -shaped grooves 19a, 19b, 19e (see FIG. 3 (b)) in which 45 is inclined by an angle α with respect to the center line 46 of the slide pipe 12.

Further, the pin insertion portions 9 and 10 are arranged in any one of the positioning grooves even when the pipe 12 is slid to any position with respect to a large number of positioning grooves formed on the upper surface of the slide pipe 12 at predetermined intervals. It is formed at a position where both sides are pressed and engaged with each other in a crotch position, and a large number of positioning grooves are also provided from one end side of the slide pipe 12 into the rounded grooves 19a, 19b and the tapered grooves 19c, 19d. And the rounded groove 19e are formed in this order (see FIG. 5). Therefore, taper pins 6 and 7
By tightening the nut 40, the arrow A direction in FIG. 2 (a),
That is, when sliding in the direction of arrow B in FIG. 3, one of the taper pins 6 and 7 has a lower surface on which the positioning groove 19a,
While making contact with either 19b, 19e in line contact, the other makes contact with positioning grooves 19c, 19d in surface contact.

Since the present embodiment is configured as described above, the rotation of the differential shaft 5 by the differential device 3 is transmitted to the bevel gear 28 via the spline 5a and the drive pipe 22, and the bevel gear 28 is further rotated.
It is transmitted to the axle 30 via the shaft 25, the shaft 26, and the gears 27, 29, and drives the front wheel 32 via the disc 31.

Then, when adjusting the tread between the front wheels 32, 32, the nut 40 fastening the taper pins 6, 7 is rotated in the direction of loosening, and the taper pins 6, 7 are moved in the direction of arrow C in FIG. To slide the lower side surfaces 6c, 7c away from the positioning groove to release the slide pipe 12. In this state, the slide pipe 12 is stretched to the maximum in the direction of expanding the tread, for example. Then, the positioning grooves 19 are formed in the pin insertion portions 9 and 10, respectively.
a and 19c correspond to each other, and in this state, the nut 40 is tightened to move the taper pins 6 and 7 in the direction of arrow B in FIG.
As a result, the taper pin 6 located on the inner side of the fuselage is in line contact with the positioning groove 19a, and the taper pin 7 located on the outer side of the fuselage is in contact with the positioning groove 19c in surface contact.
Therefore, when the tread is at the maximum, a large moment acting on the drive pipe 22 is surely carried by the surface contact between the taper pin 7 and the positioning groove 19c, and in this case, the positioning groove 19a relatively free from load. Contacts with the taper pin 6 in the form of line contact and absorbs the machining tolerance, so that the drive pipe 22 does not rattle.

On the contrary, when the slide pipe 12 is contracted most to minimize the tread, the positioning grooves 19c and 19e are positioned correspondingly to the pin insertion portions 9 and 10, respectively. In this state, when the nut 40 is tightened and the taper pins 6 and 7 are moved in the direction of arrow B in FIG. 3, the taper pin 6 on the inner side of the machine body comes into surface contact with the positioning groove 19c and the taper pin on the outer side of the machine body. 7 is in line contact with the positioning groove 19e. Therefore, in the state where the tread is at a minimum, the moment acting on the slide pipe 12 is smaller than that at the time when the tread is at a maximum, so that the positioning groove 19e side is sufficient for the engagement by the line contact, and the positioning groove 19c is the surface contact. By engaging with each other, the machining tolerance is absorbed between the two, so that the occurrence of backlash is surely prevented.

Also, in cases other than the above-mentioned combination, one taper pin presses and engages the positioning groove by surface contact, and the other taper pin presses and engages the positioning groove by surface contact, resulting in a machining tolerance. In any case, it is absorbed and the occurrence of backlash is surely prevented.

(G) Effect of the Invention As described above, according to the present invention, the pin insertion part is provided in the axle housing (2) so as to correspond to any two positions of the multiple positioning grooves formed in the slide pipe (12). Tapered pins (6) and (7) in which (9) and (10) are provided and a large number of positioning grooves are inserted and arranged in the pin insertion portion.
One of them has a taper groove that makes a surface contact, and the other has a round groove that makes a line contact.Therefore, when adjusting the tread of the front wheel (32), a large number of positioning grooves are used. In any case, one of the taper pins (6) and (7) may come into surface contact and the other may come into line contact with the taper pins (6) and (7), so that the slide pin slides. The pipe (12) can be carried in a state in which the processing tolerance is absorbed, and it is possible to reliably prevent problems such as play in the slide pipe (12).

[Brief description of drawings]

1 is a sectional view showing a front wheel tread adjusting device according to the present invention, FIG. 2 (a) is a sectional view taken along the line aa in FIG. 1, and FIG.
FIG. 2B is a sectional view of the taper pin taken along line bb in FIG. 2A, FIGS. 3A and 3B are plan views showing positioning grooves formed in the slide pipe, and FIG. 4A. , (B) are diagrams showing a cutting process in the case of forming a tapered groove and a rounded groove in the slide pipe, respectively. And FIG. 5 is a view showing the arrangement of many positioning grooves formed in the slide pipe. 2 ... Axle housing, 6,7 ... Taper pin, 9,10
...... Pin insertion part, 12 …… Slide pipe, 19a, 19b, 19c,
19d, 19e …… Positioning groove.

Claims (1)

[Scope of utility model registration request] 1. A slide pipe having a front wheel attached to one end,
A front wheel tread adjusting device for a mobile agricultural machine configured to be freely slidable within an axle housing and fixed at a predetermined adjustment position, wherein a large number of positioning grooves are formed on an outer peripheral surface of the slide pipe along an axial direction. In addition, 2 of these positioning grooves are provided on the axle housing.
The pin insertion portions are provided so as to correspond to the positions, and the taper pins are inserted and arranged in the pin insertion portions, respectively, and further, the plurality of positioning grooves are provided with the taper groove that makes surface contact with the taper pin and the round groove that makes line contact with the taper pin. And one of the two taper pins is in contact with the positioning groove formed of the taper groove, and the other of the taper pins is in contact with the positioning groove formed of the round groove. A front wheel tread adjusting device for a mobile agricultural machine, which is characterized by arranging grooves.