JPH0594077U - Positioner for grease fitting for adjusting idler position - Google Patents

Abstract

(57) [Summary] [Purpose] The direction of the adjusting grease fitting is not affected by the expansion and contraction of the spring so that the track tension can be adjusted at all times. [Structure] A recoil spring 5 is attached to the outer circumference of a piston rod 3 connected to an idler 1 via a yoke 2 and a cylinder 4 to which the piston rod 3 is fitted from one side. In an idler position adjusting device that includes a case 6 and adjusts the position by injecting and discharging grease from the other side of the cylinder 4, an end surface on the other side of the cylinder 4 and a track frame 8 are provided. A hole 9a in a supporting plate 9 which is fixed and holds one end of the spring case 6.
A rotation stopping member 1 which is fixed to a polygonal rotation stopping plate 11 which penetrates through the grease fitting 10 and is in contact with one side 11a of the rotation stopping plate 11 on the support plate 9.
Fixed to 2. [Effect] The problem that the position of the inlet of the grease fitting is rotated by the rotation of the recoil spring and the grease cannot be supplied is solved.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a grease fitting positioning device for adjusting an idler position for adjusting track tension in a tracked vehicle such as a bulldozer.

[0002]

[Prior Art]

 Conventionally, the underbody structure of a tracked vehicle generally has a structure as shown in FIG. 4, for example, in the case of a bulldozer. That is, the crawler belt 23 is provided around the sprocket 21 and the idler 22, and when the sprocket 21 rotates, the crawler belt 23 rotates to drive the vehicle. Here, 24 is a vehicle body, 25 is an earthwork plate, and 26 is a truck frame in which a recoil spring case is housed.

The support structure of the underbody idler cushion is, for example, as shown in the side view of FIG. 5, the idler 22 is supported by the yoke 27 attached to the track frame 26. A piston rod 28 is attached to the tip of 27, and a cylinder 29 for adjustment is externally fitted. A flange 30 is formed at the outer peripheral end of the cylinder 29, and is attached so that one end of a recoil spring 31 fitted on the cylinder 29 comes into contact with it. The other end of the recoil spring 31 contacts the bottom 33a of the case 33 of the recoil spring 31 slidably fitted to the outer periphery of the grease guide 32 integrally formed on the other side of the cylinder 29. Have been installed. Then, the hexagon nut which fits the inward portion 33b of the bottom 33a into the hole 34a of the support plate 34 fixed to the track frame 26 and is screwed with the screw provided at the end portion of the grease guide 32. The set length of the coil spring 31 is set by tightening 35. A stopper 36 is attached to the front end of the hexagon nut 35 to prevent the hexagon nut 35 from returning. A grease fitting 37 is attached to an end surface of the grease guide 32, and a greasing window 38 is provided in the track frame 26 corresponding to this position. In the figure, 33c is a flange of the case 33, 39 is a cover cover, and a dust seal 40 is provided between the end surface of the cover cover 39 and the piston rod 28 to prevent water or the like from being applied to the case. The inside of 33 is prevented. FIG. 6 is a view taken in the direction of arrow C in FIG. 5. The window 38 provided in the track frame 26 is in the X direction which is directly above the inlet of the grease fitting 37, in other words, of the grease fitting 37. The inlet is mounted so that it is always in the X direction when assembled.

The tension of the crawler belt 23 is adjusted by inserting a grease gun through the window 38, injecting grease into the cylinder 29 from the grease fitting 37 through the grease guide 32, and pushing out the idler 22. The force of the recoil spring 31 is always applied to the idler 22, and when the idler 22 receives a large impact from the outside, it is absorbed by the recoil spring 31. When the idler 22 is returned, it can be returned by discharging the grease from the cylinder 29.

[0005]

[Problems to be solved by the device]

 With such a structure, if the recoil spring 31 constantly expands and contracts due to an external force during traveling, the recoil spring 31 expands and contracts to generate a force in the rotational direction. While repeating this, the cylinder 29 rotates little by little, and finally the position of the inlet of the grease fitting 37 is removed from the greasing window 38 of the track frame 26, and the grease gun is opened to the window 38. Even if it is inserted from above, it cannot be set in the grease fitting 37, and it becomes impossible to lubricate, and it becomes impossible to adjust the track tension.

In order to solve the above problems, conventionally, as shown in FIG. 7, a knock pin 41 is fitted to a flange 30 of a cylinder 29, and a tip of the knock pin 41 is attached to a cover cover of a case 33 of a recoil spring 31. It is fitted in a hole 42 formed at −39. Further, the outer shape of the flange 33c of the case 33 is designed to keep a small clearance s along the inner surface shape of the track frame 26 as shown in FIG. 8 which is a DD cross section of FIG. There is something. As a result, there is almost no relative rotation between the cylinder 29 and the case 33, and relative rotation between the case and the track frame 26 is also slight. Therefore, the position of the inlet of the grease fitting 37 does not deviate from the window 38.

However, when the idler 22 receives an external force and compresses and moves the recoil spring 31, a twist is generated between the cook pin 41 and the hole 42 of the lid cover 39, and abnormal noise is generated. In addition, since there is a gap between the cook pin 41 and the hole 42, water or the like may enter and cause rust.

In view of the above, the present invention provides a positioning device for idler position adjusting grease fitting which can adjust the track tension at all times without causing abnormal noise or water intrusion. It was made with the purpose of eliminating the drawbacks it possesses.

[0009]

[Means for Solving the Problems]

 According to claim 1 of the present invention as means for solving the above-mentioned problems of the prior art, a recoil is provided on a piston rod connected to an idler via a yoke and on the outer circumference of a cylinder on which the piston rod is fitted from one side. A device for adjusting the position of an idler, in which a spring is mounted and a spring case is provided to cover the spring, the grease is injected and discharged from the other side of the cylinder to adjust the position, -The lid cover of the case is provided with a protrusion close to the inner surface of the track frame for preventing relative rotation between the track frame and the spring case. On the other end face of the cylinder, a polygonal shape which is fixed to the track frame and which penetrates the hole of the supporting plate for holding one end of the spring case and which is integral with the grease fitting is formed. With fixed the door, the rotation stopping flop les to the support plate - - rolling stop pre, characterized in that the fixed detent member in contact with one side of the bets.

[0010]

[Action]

 According to the above construction, since the lid cover shape of the spring case is a projection close to the inner surface of the track frame, the relative rotation between the spring case and the track frame is slight. .. In addition, a rotation stop plate integral with the grease fitting is fixed to the other end surface of the cylinder, and a detent member in contact with one side of the rotation stop plate is fixed to the support plate. The rotation of the spring case is fixed, and thus the position of the inlet of the grease fitting is also fixed without rotation.

[0011]

【Example】

 FIG. 1 is a sectional view of an embodiment of a positioning device for idler position adjusting grease fitting according to the present invention, FIG. 2 is a sectional view taken along line AA of FIG. 1, and FIG. 3 is a sectional view taken along line BB of FIG. Is.

Hereinafter, the present invention will be described with reference to an embodiment shown in FIGS. The structure and the function are almost the same as those shown in FIG. 5 except for the reference numerals, but since they are almost the same, refer to the above description for the portions not described. According to claim 1 of the present invention, a recoil subring 5 is attached to the outer circumference of a piston rod 3 connected to an idler 1 via a yoke 2 and a cylinder 4 fitted with the piston rod 3 from one side. A cover for the spring case 6 is provided in an idler position adjusting device which is provided with a sprinkling case 6 covering the same and adjusts the position by injecting and discharging the grease from the other side of the cylinder 4. The cover 7 is provided with a protrusion 7a close to the inner surface of the track frame 8 as shown in FIG. 2 for preventing relative rotation between the track frame 8 and the spring case 6. In the first aspect of the present invention, the other end surface of the cylinder 4 penetrates a hole 9a of a support plate 9 fixed to a track frame 8 and holding one end of the spring case 6, and a grease sheet 2 is provided. Ting 10 Body polygon detent flop Les - with fixed the door 11, the rotation stopping pre to the support plate 9 - is composed of those fixed detent member 12 in contact with the one side 1 1a bets 11.

A piston rod 3 is fastened to the other end of a yoke 2 which supports an idler 1 on one side, and the piston rod 3 is fitted inside one side of an adjusting cylinder 4 having a flange 4a on one side. There is. A grease guide 13 having a grease passage therein is integrally formed or fixed to the other side of the cylinder 4. One side of the recoil spring 5 is attached to the flange 4a, and the other side of the recoil spring 5 is attached to a bottom 6a of a spring case 6 serving as a cover of the recoil spring 5. A protrusion 6b is formed on the bottom 6a, and this portion is fitted in a hole 9a of a support plate 9 provided on the track frame 8. A flange 6c is provided on the side of the spring case 6 opposite to the bottom 6a. A cover 7 is attached to the flange 6c. The cover 7 has a projection 7a, a portion of which is close to the track frame 8. The bottom 6a of the spring case 6 is slidably fitted on the outer periphery of the grease guide 13, and a screw is provided on the shaft portion near the end of the grease guide 12, The spring case 6 is integrated with the grease guide 13 by screwing and tightening the hexagon nut 14 onto the spring case 6. Further, a stopper 15 for preventing rotation is provided near the hexagon nut 14. A polygonal anti-rotation plate 11 is fastened to the end face of the grease guide 13 with bolts 16 and the like, and the grease fitting 10 is passed through the plate 11 and screwed into the grease guide 13. There is. The inlet at this time is directed toward the window 17 provided on the track frame 8. In this embodiment, the anti-rotation member 12 is an angle member that extends in parallel from the support plate 9 so as to come into contact with one side 11a of the polygon of the rotation stop plate 11 and is fixed thereto by welding or the like. Ribs 18 are vertically fixed to the left and right spring case 6 sides of the hole 9a of the support plate 9.

Next, the operation will be described. When the vehicle with the idler cushion A'ssy composed of the idler 1 and the spring case 6 assembled as shown in FIG. 1 is running, external force is applied to the idler 1 and the recoil spring 5 expands and contracts. A force in the direction of rotation is generated to try to rotate the spring case 6 and the cylinder 4, but the protrusion 7a of the lid cover 7 prevents the spring case 6 and the cylinder 4 from rotating slightly. When the recoil spring 5 is returned or returned after being stroked, the hexagon nut 14 tries to rotate counterclockwise when viewed from the rear because it is a right-hand thread. At this time, the cylinder 4 tends to rotate relatively, but the rotation preventing member 12 restrains the rotation of the rotation stopping plate 11, so that the cylinder 4 does not rotate. Therefore, the inlet of the grease fitting 10 does not change its angle by rotation unlike the conventional case.

[0015]

[Effect of the device]

 As described above, according to the present invention, since the lid cover shape of the spring case is brought close to the inner surface of the track frame, the relative rotation between the track frame and the spring case becomes small, and The conventional problem that the grease inlet of the grease fitting rotates due to the relative rotation and the greasing becomes impossible is solved by the present invention. Furthermore, according to the present invention, there is no fear that water or the like will enter the spring case that has been conventionally generated, and no abnormal noise is generated.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a cross section of an embodiment of a positioning device for idler position adjusting grease fitting according to the present invention.

FIG. 2 is an explanatory view showing a cross section taken along the line AA of FIG.

FIG. 3 is an explanatory diagram showing a BB cross section of FIG. 1;

FIG. 4 is an explanatory view showing a side surface of a known bulldozer.

FIG. 5 is an explanatory view showing a cross section of a conventional idler cushion.

FIG. 6 is an explanatory view showing a direction of arrow C in FIG.

FIG. 7 is an explanatory diagram showing a configuration of a conventional grease fitting positioning device.

FIG. 8 is an explanatory diagram showing a DD cross section of FIG. 6;

[Explanation of symbols]

 1 Idler 2 Yoke 3 Piston Rod 4 Cylinder 5 Recoil Spring 6 Spring Case 7 Lid Cover 7a Protrusion 8 Track Frame 9 Support Plate 9a Hole 10 Grease Fitting 11 Rotation Stop Plate 12 Rotation Stopper Member

Claims (2)

[Scope of utility model registration request] 1. A spring case in which a recoil spring is attached to the outer circumference of a piston rod connected to an idler via a yoke and the piston rod is fitted from one side, and the recoil spring is covered. And an idler position adjusting device for adjusting the position by injecting and discharging the grease from the other side of the cylinder, the track frame and the spring case being provided on the cover cover of the spring case.
A positioning device for idler position adjusting grease fitting, characterized in that a protrusion adjacent to the inner surface of the track frame is provided to prevent relative rotation with respect to the space. 2. A polygonal shape which is fixed to a track frame and penetrates a hole of a support plate which holds one end of the spring case, and is integral with the grease fitting, on the other end surface of the cylinder. While fixing the rotation stop plate of
2. A positioning device for idler position adjusting grease fitting according to claim 1, further comprising a detent member fixed to one side of the anti-rotation plate, the detent member being fixed to the support plate.