JP5807031B2 - Hand guide roller roll drive gear mounting structure - Google Patents

Description

  The present invention relates to a hand guide roller used for road surface compaction and the like.

  The hand guide roller is a relatively small non-boarding type of compaction machine that compacts the road surface with running wheels (rolls) and is used for compaction of asphalt pavement rolling and road shoulders, narrow roads, etc. The

  The internal structure of the conventional roll of the hand guide roller is shown in FIGS. 6 is a side view of the roll, and FIG. 7 is a cross-sectional view taken along line BB in FIG. Referring mainly to FIG. 7, a pair of disc-shaped end plates 52 and 53 that are spaced apart from each other are fixed in the roll 51, and the end portions of the end plates 52 and 53 pass through the centers of the roll 51. A rotating shaft 54 that is coaxial with the shaft is fixed. Specifically, the through hole of one end plate 53 has a larger diameter than the through hole of the other end plate 52, and a ring-shaped base flange 55 is integrally formed by welding or the like in the through hole of this end plate 53. It is fixed. The rotary shaft 54 is integrated with the end plate 52 by welding or the like while being directly inserted through the through hole of the end plate 52 on the end plate 52 side, and is inserted through the through hole of the base flange 55 on the end plate 53 side to be welded or the like. Thus, it is integrated with the end plate 53 by being fixed to the base flange 55.

  A bracket 58 is attached to the side frame 56 located outside the end plate 52 in the left and right side frames 56 and 57 of the hand guide roller by a bolt 59, and the bracket 60 is attached to the side frame 57 located outside the end plate 53. Are attached by bolts 61. The bracket 60 includes a first bracket 60A and a second bracket 60B. One end of the rotary shaft 54 is supported on the bracket 58 via the bearing 62, and the other end is supported on the bracket 60 via the bearing 63. A motor mounting seat 64 is fixed to the bracket 60, and a traveling hydraulic motor M is mounted on the motor mounting seat 64 with bolts 65. The output shaft 66 of the traveling hydraulic motor M passes through the motor mounting seat 64 and is supported by the bracket 60 via the bearing 67. An output gear 68 mounted on the tip of the output shaft 66 meshes with a roll drive gear 70 fastened and fixed to the base flange 55 by a plurality of bolts 69.

  A spur gear transmission mechanism including the output gear 66 and the roll drive gear 70 is accommodated in a gear transmission mechanism accommodating chamber 71 formed by the first bracket 60A. The gear transmission mechanism accommodation chamber 71 is filled with a lubricant, and an oil seal 73 is interposed between the first bracket 60 </ b> A and the base flange 55 as a sealing portion 72 that seals the gear transmission mechanism accommodation chamber 71. .

As described above, when the output shaft 66 of the traveling hydraulic motor M rotates, the rotation shaft 54 is supported by the bearings 62 and 63 and rotated by the spur gear transmission mechanism including the output gear 66 and the roll drive gear 70. The roll 51 integrated with and rotates.
The above structure is described in Patent Document 1, for example.

JP 2010-144386 A

  The roll drive gear 70 is detachably attached to the rotating shaft 54 so that it can be replaced when tooth wear, tooth missing, or the like occurs. Conventionally, as described above, a fastening structure using the bolt 69 is used. Yes. In this structure, transmission of rotational torque between the roll drive gear 70 and the rotary shaft 54 is performed at a contact portion between the seat surface of the bolt head of the bolt 69 and the surface of the roll drive gear 70. Since the screw has the characteristic that the frictional force generated on the seat surface is weak compared to its tightening force (axial force), the conventional structure has a large distance from the center of rotation to the point of action of the force, specifically, In this structure, a plurality of bolts 69 are arranged at equal intervals on a large-diameter pitch around the axis of the rotating shaft 54. The base flange 55 is provided for fastening bolts 69 to be arranged on a pitch larger than the outer diameter of the rotating shaft 54.

However, the structure requiring the base flange 55 has two main problems.
(1) “The left and right weight balance of the roll 51 becomes worse”
In the structure in which the traveling hydraulic motor is arranged on one side in the left and right direction in the roll 51 and the base flange 55 is also arranged in addition to this, the weight balance in the left and right direction of the roll 51 is deteriorated and the roll 51 is balanced when the roll 51 rotates. There is a risk of vibration associated with deterioration.
(2) “Minimum height dimension H of the sealing portion 72 is reduced, and muddy water and dust are more likely to enter.”
The sealing portion 72 (oil seal 73) is a portion that is located between the peripheral surface of the rotating shaft 54 and the bracket 60 and seals the gear transmission mechanism accommodation chamber 71, and a base flange 55 is attached to the rotating shaft 54. In the structure, the sealing portion 72 is interposed between the outer peripheral surface of the base flange 55 and the bracket 60. That is, the diameter of the sealing portion 72 is increased by the presence of the base flange 55, and the minimum height dimension H of the sealing portion 72 is reduced, so that muddy water and dust can easily enter the gear transmission mechanism accommodation chamber 71. Become.

  Further, as a problem of the bracket 60, if the bracket 60 is made of, for example, a casting, and the connection portion with the side frame 57, the formation portion of the gear transmission mechanism accommodating chamber 71, the support portion of the bearing 63, and the like can be integrally formed with a mold, the bracket This leads to a reduction in the number of parts. However, the conventional bracket 60 has an opening for attaching the oil seal 73 on one end side in the axial direction of the gear transmission mechanism accommodating chamber 71 and an opening for attaching the bearing 63 on the other end side in the axial direction. Since both openings are formed with a diameter smaller than the outer diameter of the roll drive gear 70, if the bracket 60 is integrally formed, the roll drive gear 70 can be incorporated into the gear transmission mechanism accommodating chamber 71. There is a problem that you can not. Therefore, conventionally, the bracket 60 is divided into at least a first bracket 60A to which the oil seal 73 is attached and a second bracket 60B to which the bearing 63 is attached, and both brackets are attached by bolts 74 after the roll drive gear 70 is assembled. The structure was fastened and fixed.

  The present invention was created in order to solve such problems. The purpose of the present invention is to improve the right and left weight balance of the roll and to reduce the intrusion of muddy water into the gear transmission mechanism housing chamber. A bracket having a support function is configured as an integrally molded product.

In order to solve the above-mentioned problems, the present invention drives a rotary shaft that is coaxially arranged with a roll and rotates integrally with the roll, a roll drive gear attached to the rotary shaft, and the roll drive gear. A traveling hydraulic motor, a frame connecting portion attached to a side frame, and a gear accommodating portion that accommodates the periphery of the roll drive gear, and the rotation shaft is inserted through a side wall formed near the inside of the roll of the gear accommodating portion. In the hand guide roller in which a bracket formed with a through hole and a bearing attached to the bracket and supporting the rotating shaft are arranged, one end surface of the roll drive gear abuts against an end surface of the rotating shaft. A fitting hole drilled to penetrate from one end surface to the other end surface of the roll drive gear, and a bottomed fitting drilled in the end surface of the rotating shaft Fitting pins made of spring pins which exhibited cross-sectional C-shape to fit over and through, characterized in that attached to the rotating shaft.

  According to this roll drive gear mounting structure, the transmission of rotational torque between the roll drive gear and the rotating shaft depends on the shear resistance strength of the fitting pin. The shearing resistance of the fitting pin represented by the spring pin made of SK material is much larger than the frictional force obtained on the bearing surface of the bolt head. Therefore, according to the present invention, there is no need to increase the distance from the center of rotation to the point of action of the force, the fitting pin can be disposed on the end surface of the rotating shaft, and a conventional base flange is not required.

  In addition, the present invention is characterized by comprising a gear disengagement prevention bolt that fastens the roll drive gear to an end face of the rotating shaft and prevents the roll drive gear from moving in the axial direction.

  According to this roll drive gear mounting structure, even if the frictional force between the fitting hole and the fitting pin is reduced and the roll drive gear is likely to be detached from the rotating shaft, the roll drive gear is prevented by the gear disengagement prevention bolt. Is prevented from coming off.

  Further, according to the present invention, a plurality of the fitting pins are arranged in a circumferential direction around the axis of the rotation shaft, the gear disengagement prevention bolt is arranged on the axis of the rotation shaft, and the gear disengagement prevention bolt A seat surface or a washer is positioned so as to overlap each fitting hole of the roll drive gear.

  According to this roll drive gear mounting structure, the gear detachment prevention bolt is located on the axis of the rotary shaft, so that the rotational torque is not so great and the gear detachment prevention bolt does not loosen. In addition, it is possible to prevent the plurality of fitting pins from coming off with one gear disengagement prevention bolt.

  In the present invention, a sealing portion is interposed between the rotating shaft and the through hole of the bracket, and the bearing is provided between the roll drive gear and the sealing portion in the axial direction of the rotating shaft. It is arrange | positioned and it is attached to the through-hole of the said bracket, It is characterized by the above-mentioned.

  According to the mounting structure of the roll drive gear, the sealing portion and the bearing are arranged closer to the inside of the roll than the gear housing portion. Therefore, there is no need to form a small-diameter opening for the bearing near the outside of the roll of the gear housing as in the prior art, and the opening on the outside of the roll of the gear housing is larger than the outer diameter of the roll drive gear. Can be formed as Thereby, even if a bracket is integrally molded, a roll drive gear can be incorporated in a gear accommodating part.

According to the present invention, since the conventional base flange is not required, the right and left weight balance of the roll is improved, and intrusion of muddy water or the like into the gear transmission mechanism accommodation chamber is reduced.
In addition, since the bracket can be constructed from an integrally molded product, the number of parts is reduced compared to the conventional bracket structure that is divided and the assembly work of the bracket becomes unnecessary.

It is an external appearance perspective view of a hand guide roller. It is a side view of a roll. It is AA sectional drawing in FIG. It is an external appearance perspective view of a bracket. It is explanatory drawing of a spring pin. It is a side view of the conventional roll. It is BB sectional drawing in FIG.

  In FIG. 1, a hand guide roller R is mounted on a traveling machine body 1 with an engine serving as a traveling drive source and a hydraulic pump (both not shown) driven by the engine. A roll 2 is provided. Flat side frames 3 and 4 are attached to both sides of the traveling machine body 1, and the roll 2 is supported by the side frames 3 and 4 as described later. The pressure oil flows from the hydraulic pump to the traveling hydraulic motor M (see FIG. 3) in the roll 2 by driving the engine, so that the roll 2 rotates and the hand guide roller R travels. A control stick 5 is attached to the rear part of the traveling machine body 1, and an operation panel 6 and a handle 7 held by an operator are provided near the control stick 5. On the upper surface of the operation panel 6, there is provided a forward / reverse lever 8 for moving the traveling machine body 1 forward and backward when tilted forward and backward from an intermediate neutral position.

  2 is a side view of one of the rolls 2, and FIG. 3 is a cross-sectional view taken along line AA in FIG. In FIG. 3, a pair of disc-shaped end plates 11 and 12 that are spaced apart from each other are fixed in the roll 2, and a rotating shaft 13 that passes through each center and is coaxial with the roll 2 is fixed to the end plates 11 and 12. It is installed. The rotary shaft 13 is integrated with the end plates 11 and 12 by welding or the like while being directly inserted through the through holes of the end plates 11 and 12. The rotation shaft 13 is formed as a central shaft portion 13A having a constant diameter at a central portion inserted through the through holes of the end plates 11 and 12, and each of the rotation shafts 13 within the central shaft portion 13A protruding outward from the end plates 11 and 12 is provided. The periphery of the tip is formed as small diameter portions 13B and 13C having a slightly smaller diameter than the central shaft portion 13A.

  A bracket 14 is attached to the side frame 3 with bolts 15, and a bracket 16 is attached to the side frame 4 with bolts 17. The rotary shaft 13 is supported by the bracket 14 via the bearing 18 at the small diameter portion 13B, and is supported by the bracket 16 via the bearing 19 at the small diameter portion 13C. Reference numeral 20 is a retaining ring for preventing the bearing 18 from moving in the axial direction, reference numerals 21 and 22 are retaining rings for preventing the bearing 19 from moving in the axial direction, and reference numeral 23 is a ring-shaped spacer.

  The bracket 16 will be described with reference to FIG. 4 as well. The bracket 16 is generally formed in a forked shape from the upper portion of the gear housing portion 24 and a gear housing portion 24 that is substantially flat in the axial direction of the rotary shaft 13. The frame connecting portion 25 extends toward the side frame 4 and has a fastening seat for the bolt 17 formed at the tip portion. The bracket 16 is made of a casting, and the gear housing portion 24 and the frame connecting portion 25 are integrally formed. A side wall 26 near the one end in the axial direction of the gear accommodating portion 24 (close to the inner side of the roll) is disposed so as to face the end plate 12. A through hole 26A through which the rotary shaft 13 is inserted is formed substantially at the center of the side wall 26. Between the through hole 26A and the rotary shaft 13, the bearing 19 and an oil seal 27 as a sealing portion 42 are provided. It is installed. The other end in the axial direction of the gear housing portion 24 (the outer side of the roll) is formed as a large opening so that an output gear 33, a roll drive gear 35 and the like which will be described later can be incorporated.

  The gear housing portion 24 is formed to have a bulging portion 24 </ b> A that bulges in a radially outward direction in a part of the circumferential direction. The opening near the other axial end of the gear housing 24 is closed by a flat cover 29 attached to the edge around the opening, including the bulging portion 24A, by a plurality of bolts 28. The cover 29 is an iron plate, for example. Thereby, the internal space of the gear accommodating part 24 is comprised as the sealed gear transmission mechanism accommodating chamber 30. FIG.

The traveling hydraulic motor M is fastened and fixed to the edge around the bulging portion 24A of the gear housing portion 24 by a bolt 32 so that the output shaft 31 is located inside the bulging portion 24A. The cover 29 has a hole through which the output shaft 31 is passed. An output gear 33 composed of a spur gear is attached to the output shaft 31. The cylindrical shaft portion of the output gear 33 is supported by a bearing 34 attached to the bulging portion 24 </ b> A of the gear housing portion 24. The output gear 33 meshes with a roll drive gear 35 that is a spur gear attached to the rotary shaft 13.
As described above, when the output shaft 31 of the traveling hydraulic motor M rotates, the rotating shaft 13 is supported by the bearings 18 and 19 and rotated by the gear transmission mechanism including the output gear 33 and the roll drive gear 35, and is integrated with the rotating shaft 13. The rolled roll 2 rotates.

  One end surface of the roll drive gear 35 is abutted against the end surface of the rotary shaft 13, and the roll drive gear 35 is fitted over a fitting hole 37 drilled in the roll drive gear and a fitting hole drilled in the end surface of the rotary shaft 13. It is fixed to the rotating shaft 13 by a coupling pin 36. As the fitting pin 36, a spring pin having a C-shaped cross section as shown in FIG. 5 is suitable. The spring pin is, for example, according to JIS B 2808. A plurality of (three in this embodiment) fitting pins 36 are provided at equal intervals in the circumferential direction around the axis of the rotating shaft 13.

  The roll drive gear 35 has a plurality of screw holes 38 (three locations in the present embodiment) formed at equal intervals on the pitch of the fitting holes 37. That is, in the roll drive gear 35, the fitting holes 37 and the screw holes 38 are alternately formed at the same pitch as shown in FIG. The screw hole 38 is for screwing a removing bolt (not shown) when the roll drive gear 35 is replaced, for example. As the release bolt is tightened, the tip of the release bolt comes into contact with the end surface of the rotary shaft 13, and the roll drive gear 35 can be removed from the rotary shaft 13 by the feed screw action of the release bolt and the screw hole 38.

  Further, the roll drive gear 35 is attached to the rotary shaft 13 by a gear disengagement prevention bolt 39 inserted through a bolt through hole drilled in the roll drive gear 35 and screwed into a female screw screwed to the end face of the rotary shaft 13. Fastened and fixed. The gear detachment prevention bolt 39 is located on the axis of the rotary shaft 13. Reference numeral 40 is a spring washer, reference numeral 41 is a washer, and the washer 41 is positioned such that its outer edge overlaps each fitting hole 37.

"Action"
When the roll drive gear 35 is rotated by driving the traveling hydraulic motor M, the rotational torque of the roll drive gear 35 is transmitted to the rotary shaft 13 via the fitting pin 36, and at that time, a shearing force acts on the fitting pin 36. To do. That is, while the conventional structure uses the frictional force of the bearing surface of the bolt head as the transmission of the rotational torque from the roll drive gear 35 to the rotating shaft 13, the present invention provides the shear strength of the fitting pin 36. It becomes a structure to use. In general, the shear strength of a general-purpose spring pin made of SK material is much larger than the frictional force obtained on the bearing surface of the bolt head. Therefore, according to the present invention, it is not necessary to increase the distance from the rotation center to the force application point, and the fitting pins 36 are arranged on a pitch smaller in diameter than the outer diameter of the rotating shaft 13, that is, the end surface of the rotating shaft 13. Therefore, the conventional base flange 55 (FIG. 7) is not required.

  Even if, for example, the frictional force between the fitting hole 37 and the fitting pin 36 decreases and the roll drive gear 35 is likely to be detached from the rotating shaft 13, the roll drive gear 35 is prevented by the gear disengagement prevention bolt 39. Disengagement is prevented. Since the gear detachment prevention bolt 39 is located on the axis of the rotary shaft 13, the rotational torque is not so much applied, and the gear detachment prevention bolt 39 is not loosened.

  Further, since the outer edge of the washer 41 is positioned so as to overlap the fitting hole 37, the washer 41 prevents the fitting pin 36 from coming off from the fitting hole 37. In some cases, without providing the spring washer 40 and the washer 41, the seat surface of the gear disengagement prevention bolt 39 is disposed so as to overlap the fitting hole 37, and the seat surface of the gear disengagement prevention bolt 39 is arranged from the fitting hole 37. The fitting pin 36 may be prevented from coming off.

  According to the present invention, since the conventional base flange 55 (FIG. 7) is not required, the right and left weight balance of the roll 2 is improved. Further, since the base flange 55 does not exist, the sealing portion 42 (the oil seal 27 in this embodiment) between the rotating shaft 13 and the bracket 16 is reduced in diameter, and the minimum height dimension H of the sealing portion 42 is increased. . Therefore, infiltration of muddy water and dust from the sealing portion 42 into the bearing 19 and the gear transmission mechanism accommodation chamber 30 is reduced.

  Further, according to the present invention, the bearing 19 having a diameter smaller than that of the roll drive gear 35 is disposed between the roll drive gear 35 and the oil seal 27 in the axial direction of the rotary shaft 13 and penetrates the side wall 26 of the bracket 16. It is attached to the hole 26A. Accordingly, it is not necessary to form a small-diameter opening for the bearing near the roll outside of the gear housing 24 (gear transmission mechanism housing chamber 30), and the opening near the roll outside of the gear housing 24 is used as the output gear 33 or the roll. The drive gear 35 and the like can be formed as a large opening that can be incorporated. That is, the roll drive gear 35 can be incorporated into the gear housing portion 24 even if the bracket 16 is integrally formed.

  The preferred embodiment of the attachment structure of the roll drive gear of the hand guide roller according to the present invention has been described above. However, each constituent means is not limited to the contents described in the drawings, and may be appropriately selected within the scope of the present invention. Design changes are possible. As the fitting pin 36, for example, a taper pin according to JIS B 1352 can be used in addition to the spring pin.

DESCRIPTION OF SYMBOLS 1 Traveling machine body 2 Roll 3, 4 Side frame 13 Rotating shaft 16 Bracket 24 Gear accommodating part 25 Frame connecting part 26 Side wall 26A Through hole 30 Gear transmission mechanism accommodating chamber 33 Output gear 35 Roll drive gear 36 Fitting pin 37 Fitting hole 38 Screw hole 39 Gear disengagement prevention bolt 40 Spring washer 41 Washer 42 Sealing part M Travel hydraulic motor R Hand guide roller

Claims (4)

Inside the roll,
A rotating shaft that is arranged coaxially with the roll and rotates integrally with the roll;
A roll drive gear attached to the rotating shaft;
A traveling hydraulic motor for driving the roll drive gear;
A through hole through which the rotating shaft is inserted is formed in a side wall formed on the inner side of the roll of the gear housing portion, having a frame connecting portion attached to the side frame and a gear housing portion for housing the periphery of the roll drive gear. Brackets,
A bearing attached to the bracket and supporting the rotating shaft;
In the hand guide roller where
One end surface of the roll drive gear is abutted against the end surface of the rotation shaft, and a fitting hole is formed so as to penetrate from one end surface to the other end surface of the roll drive gear, and the end surface of the rotation shaft is drilled. An attachment structure for a roll drive gear of a hand guide roller, wherein the attachment shaft is attached to the rotating shaft by a fitting pin comprising a spring pin having a C-shaped cross section that fits over the bottomed fitting hole .   The attachment of the roll drive gear of the hand guide roller according to claim 1, further comprising a gear detachment prevention bolt that fastens the roll drive gear to an end surface of the rotary shaft to prevent the roll drive gear from moving in the axial direction. Construction. A plurality of the fitting pins are arranged in a circumferential direction around the axis of the rotating shaft,
The gear disengagement prevention bolt is disposed on an axis of the rotary shaft;
The structure for mounting a roll drive gear of a hand guide roller according to claim 2, wherein a seat surface or a washer of the gear disengagement prevention bolt is positioned so as to overlap each fitting hole of the roll drive gear. A sealing portion is interposed between the rotating shaft and the through hole of the bracket,
The said bearing is arrange | positioned between the said roll drive gear and the said sealing part in the axial direction of the said rotating shaft, and is attached to the through-hole of the said bracket. Attachment structure of the roll drive gear of the hand guide roller as described in any one of Claims.

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