JPH1016839A - Crawler traveling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To keep the tensile force of a crawler constant by providing a rack pinion mechanism linearly reciprocating a tension ring in response to the relative rotary change of a link against a truck frame. SOLUTION: A truck frame 26 provided with multiple idler rollers 21 and a tension roller 22 is lowered against a fixed frame 25 supporting a drive wheel 20. Multiple rollers 21 and the tension roller 22 are separated from the drive wheel 20 to increase the tensile force of a crawler. When the truck frame 26 is lowered, the attitude of a rear link 28 is changed against the truck frame 26. A pinion 35 is rotated, and the rotation is transferred to a rack 34 provided on the side of the tension roller 22. The rack 34 is moved linearly forward, and the tensile force of the crawler is kept constant. When the truck frame 26 is lifted, the pinion 35 is reversely rotated, the rack 34 is moved linearly backward, and the tensile force of the crawler is kept constant.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crawler traveling device mounted on a combine or a transport vehicle, and more particularly, to a crawler traveling device for elevating or lowering an airframe or for rolling an airframe.

[0002]

2. Description of the Related Art Conventionally, as shown in Japanese Utility Model Laid-Open Publication No. 58-150584, a track frame provided with a plurality of rolling wheels and tension wheels on a fixed frame supporting driving wheels is conventionally used. A tensioning wheel which is connected to the track frame in a forward and backward direction with respect to the track frame so as to maintain a constant tension of the crawler as the track frame moves up and down with respect to the fixed frame. A moving mechanism is provided.

[0003]

In the above crawler traveling apparatus, when the track frame provided with a plurality of rolling wheels and tension wheels is lowered with respect to the fixed frame supporting the driving wheels, the relative distance between the two is increased. Crawler tension increases, that is, the apparent circumferential length of the crawler increases and the crawler tension increases, so that the tension wheel is moved forward with respect to the track frame, that is, to the drive wheel side. In order to reduce the tension of the crawler and maintain the tension of the crawler constant, in configuring a tension wheel moving mechanism that moves the tension wheel of the crawler back and forth as the track frame moves up and down,
A triangular link having one end connected to the body-side fixed frame, and the other end connected to a connecting portion between the track frame and the lifting cylinder, and a rod holder including an intermediate portion of the triangular link and a threaded rod of a tension ring. When the crawler traveling device is lowered, that is, when the tensioning wheel is moved backward with the rise of the track frame, the triangular link rotates As a result, a diagonally upward component force is generated in the screw rod of the tension ring, and the screw rod undergoes bending deformation due to the component force, or it is slidable on the connecting portion between the screw rod and the slide frame, that is, the rear end of the track frame. Since the connecting portion between the slide frame and the screw rod that is internally fitted into the screw rod is deformed, the strength of the screw rod and the screw rod holding portion is increased. Must be kept, there is a regulation is less likely to perform inconvenience of crawler tension force to adjust the threaded rod with the large diameter of the threaded rod, there is room for improvement.

[0004] It is an object of the present invention to maintain the tension of the crawler constant with the vertical movement of the track frame without unnecessarily increasing the strength of the screw rod and the screw rod holding portion.

[0005]

According to the first aspect of the present invention, a track frame provided with a plurality of rolling wheels and tension wheels on a fixed frame for supporting driving wheels is lifted and lowered and fixed via a pair of front and rear links. A crawler crawler having a tensioning wheel moving mechanism that is freely connected and that can move the tensioning wheel in the front-rear direction with respect to the track frame in order to maintain a constant tension of the crawler as the track frame moves up and down with respect to the fixed frame. In a traveling device, a rack that linearly moves the tensioning wheel back and forth with the change in relative rotation of the link with respect to a track frame.
It consists of a pinion mechanism. [Operation] When the track frame provided with a plurality of rolling wheels and tension wheels with respect to the fixed frame supporting the driving wheels descends, the plurality of rolling wheels and tension wheels are relatively separated from the driving wheels, and the Tension increases. In such a case, the relative attitude of the rear link changes with respect to the track frame as the track frame descends, and the pinion rotates due to the change in the relative attitude of the rear link, and the rotation of the pinion is directly applied to the tension wheel side. By transmitting the signal to the attached rack, the rack is moved linearly forward to make the tension of the crawler constant. Conversely, when the track frame is raised, the pinion rotates in reverse to move the rack linearly rearward to keep the crawler tension constant. [Effect] As described above, the rack and pinion mechanism transmits the change in the relative position of the rear link to the track frame directly to the tension ring by rotation and linear motion.
As in the conventional case, when the relative attitude change of the rear link with respect to the track frame is transmitted to the tensioning wheel by swinging and linear motion, the screw rod for adjusting the front and rear of the tensioning ring does not receive external force of bending deformation and retains the screw rod or screw rod. The tension of the crawler can be kept constant without unnecessarily increasing the strength of the portion, whereby the crawler tension can be easily adjusted by reducing the diameter of the screw rod.

The present invention according to claim 2 is characterized in that the rack
The pinion mechanism includes a pinion that rotates integrally with the link at a fulcrum of the link, a rack on a slide bracket that supports the tensioning wheel and moves back and forth, and the pinion and the rack are interlocked. [Operation] A pinion that rotates integrally with the link is provided at the fulcrum of the link, a rack is provided on a slide bracket that supports the tensioning ring and moves back and forth, and the two are engaged with each other to directly swing the link. The tension ring can be supported and linearly transmitted to the slide bracket that moves back and forth. [Effect] As a result of the above configuration, the structure for moving the tensioning wheel back and forth can be simplified as compared with the case where an idle gear is interposed between the rack and pinion mechanism.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to a combine crawler traveling device. As shown in FIGS. 8 and 9, this combine is a four-row cutting combine, in which a cutting pre-processing device 3 is provided at a front portion of a body 1 having a pair of right and left crawler traveling devices C, C. The thruster 8 is provided at the center of the right and left sides of the fuselage. A pair of left and right Glen tanks 10 and 10 are provided on both left and right sides of the threshing device 9. A cutting device 11 is provided.

The pre-cutting device 3 includes a raising device 4 for raising the lodging grain culm, a clipper-type cutting device 5 for cutting the root portion of the raising grain culm, and a device for moving the harvested grain culm to the center in the machine width direction. The collecting device 6 includes a collecting device 6 and a vertical conveying device 7 that inherits grain stems from the collecting device 6, gradually conveys the culm to a rearward position while transferring the culm to the rear, and transfers it to the feed chain 9 a of the threshing device 9. ing.

The pair of left and right Glen tanks 10, 10
, The bottom of the threshing device 9 whose bottom is connected in communication and is driven to rotate forward and backward at regular intervals;
The grains are supplied alternately through the second and the second grains.
A bottom conveying screw 13 that conveys grains backward is disposed at the left and right center of the tank bottom 10A, and an auger 14 that discharges grains out of the tank is connected to an end of the bottom conveying screw 13. .

A hydraulic oil tank 15 is disposed in front of the left Glen tank 10.
From the Glen tank 10 so as to cover the outside of the
6 extends forward, and the operator's hand unexpectedly contacts the feed chain 9a of the threshing device 9 due to the relationship between the side cover 16 and the position of the threshing device 9 disposed on the inner side of the machine. It is possible to prevent that.

As described above, in this combine, the threshing device 9 is disposed at the left and right center of the fuselage, and the Glen tanks 10 and 10 are disposed on both left and right sides of the threshing device 9.
Even if the Glen tanks 10 and 10 become empty or full, the position of the center of gravity of the fuselage is not easily changed. Feed chain 9a of threshing device 9 from outside
, And furthermore, the waste straw is directly discharged by the feed chain 9a of the threshing device 9 and the waste straw shredder 1
1 to eliminate the need for a waste straw transport device.

Next, the crawler traveling device C will be described. Since the pair of left and right crawler traveling devices C and C have the same structure, only one crawler traveling device C will be described below. As shown in FIGS. 1 to 3, the crawler traveling device C includes a driving wheel 20, a plurality of ground contact wheels 21, and tension wheels 2.
2, a rubber crawler 23, and a drip-preventing rolling wheel 24 for preventing the rubber crawler 23 from drooping, and a plurality of rolling wheels 21 and a main frame 25 as a fixed frame provided at a lower portion of the body frame 1. A pair of left and right track frames 26 each having a tension ring 22
Are connected via an elevating link mechanism R such that the elevating adjustment can be fixed.

The lifting link mechanism R includes a main frame 25.
On the other hand, a front swing arm 27 and a rear swing arm 28, each of which is a pair of front and rear swing links that are rotatably mounted, are shown in a side view, and an upper part of the front swing arm 27. It comprises a connecting rod 29 having an adjustable length for connecting the upper part of the rear swing arm 28 and a lifting cylinder 30 connected to the upper end of the rear swing arm 28.

The anti-sag wheels 24 are provided on the main frame 25, and the drive wheels 20 are mounted on the axle case 31 a of the transmission case 31.
Are supported by the body frame 25.

The support structure for the tension ring 22 will be described in detail. An intermediate frame 32 as a slide bracket is fitted on the upper rear end of the track frame 26 so as to be slidable forward and backward. The support frame 22A of 22 is internally fitted so as to be able to slide forward and backward. A screw rod 33 is provided over the outer surface of the intermediate frame 32 and the outer surface of the tension ring support frame 22A.
The tension of No. 3 is adjusted. A rack 34 is provided on the inner side surface of the intermediate frame 32, while a pinion 35 is provided on the rear swing arm 28, and the rack 34 and the pinion 35 are engaged with each other via an idle gear 36. The pinion mechanism L moves the intermediate frame 32 and the tensioning wheel support frame 22A integrally in the front-rear direction as the track frame 26 moves up and down to move the crawler 24.
It is configured to keep the tension of the tire constant.

When the hydraulic cylinder 30 is extended, the crawler traveling device C is turned into a pair of front and rear swing arms 2.
7, 28 rotate in the same direction as the clock to move the crawler traveling device C
When the hydraulic cylinder 30 is contracted and the hydraulic cylinder 30 is contracted, the pair of front and rear swing arms 27 and 28 rotate counterclockwise, and the crawler traveling device C rises with respect to the vehicle body frame. , The crawler traveling device C is fixed to the vehicle body frame. In such a case, as the crawler traveling device C descends, the track frame 26 is relatively separated from the drive wheels 20, and the apparent circumferential length of the crawler 23 increases, and the tension of the crawler 23 increases. The pinion 35 fixed to the rear link 28 rotates relative to the track frame 26 due to a change in the relative posture of the rear swing arm 28 accompanying the lowering of the track frame 26, and the swing angle of the rear swing arm 28 The rack 34 is moved forward in proportion to the intermediate frame 32 and the tension ring support frame 22A.
Are moved integrally forward to keep the tension of the crawler 24 constant.

In the crawler traveling device C, if the hydraulic cylinders 30, 30 of the left and right crawler traveling devices C, C are simultaneously operated, the entire body relatively moves up and down, and only one hydraulic cylinder 30 is operated. In this case, the rolling of the aircraft is performed.

As shown in FIG. 4 and FIG.
Means that the teeth 20a of the sprocket are 1
Each sheet is configured to be separable and fixed via a bolt 37. The drive wheel 20 is provided with the core metal projection 2 of the crawler 23.
The crawler 23 is driven by engaging with a sprocket hole 23b formed between the sprocket holes 3a. However, when the front edge of the sprocket tooth is worn due to contact with the rear edge of the crawler core projection, usually, The crawler is removed, and the drive wheels are used by reversing the drive wheels back and forth with respect to the drive shaft so that the trailing edge is located on the front side. In such a case, by removing the teeth 20a without removing the crawler 23, The leading edge and the trailing edge can be interchanged.

[Alternative Embodiment] In the above-described embodiment, the rack and pinion mechanism L is provided with an idle gear 36 provided between the rack 34 and the pinion 35. May be directly engaged.

Further, the crawler traveling device may be a crawler traveling device such as a transport vehicle or a backhoe.

Further, as shown in FIG. 6, a roller 20 is provided at the root of the front edge of the tooth as a driving wheel of the crawler traveling device.
c may be provided so that the front edge of the sprocket teeth 20a suppresses wear due to contact with the rear edge of the crawler core bar projection 23a.

[Brief description of the drawings]

FIG. 1 is a side view of a crawler traveling device.

FIG. 2 is a plan view of the same.

FIG. 3 is a longitudinal sectional front view of the same.

FIG. 4 is an exploded side view of a drive wheel.

FIG. 5 is a longitudinal sectional front view of a drive wheel.

FIG. 6 is a longitudinal sectional side view showing another embodiment of the drive wheel.

FIG. 7 is a longitudinal sectional front view of the same.

FIG. 8 is a plan view of the combine.

FIG. 9 is a vertical rear view of the Glen tank.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 20 Drive wheel 21 Rolling wheel 22 Tension wheel 25 Fixed frame 26 Track frame 27 Front link 28 Rear link 32 Slide bracket 34 Rack 35 Pinion L Rack and pinion mechanism

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tamotsu Seiya 64 Ishizukita-cho, Sakai-shi, Osaka Inside Kubota Sakai Works

Claims (2)

[Claims] 1. A truck frame having a plurality of rolling wheels and tension wheels is connected to a fixed frame supporting driving wheels so as to be vertically movable and fixed via a pair of front and rear links.
A crawler traveling device provided with a tensioning wheel moving mechanism capable of moving the tensioning wheel in the front-rear direction with respect to the track frame so as to maintain a constant tension of the crawler as the track frame moves up and down with respect to the fixed frame; A crawler traveling device, wherein the wheel moving mechanism comprises a rack and pinion mechanism that linearly moves the tensioning wheel back and forth with a change in the relative rotation of the link with respect to the track frame. 2. The rack and pinion mechanism includes a pinion that pivots integrally with the link at a fulcrum of the link, a rack on a slide bracket that supports a tensioning wheel and moves back and forth, and interlocks the pinion and the rack. The crawler traveling device according to claim 1, wherein