JP3382366B2 - Driving side support device for screw blade for asphalt finisher - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a drive-side supporting device for a screw blade for feeding a mixture of an asphalt finisher used for pavement on a road. 2. Description of the Related Art FIGS. 3 and 4 are a plan view and a side view of an asphalt finisher. The chassis frame 1 is supported by four wheels 2 and travels in the direction of arrow A with an internal combustion engine (not shown) mounted. A screed device 5 is provided at the end of the arm 4 whose base is connected to the chassis frame 1 with a pin 13. The ends of the arms 4 on both sides are connected by a horizontal member, and a fixed shaft 7 is provided between the two arms. A central screed frame 8 is rotatably supported on the fixed shaft 7.
Both ends of a nut 9 are pivotally attached to the upper end of the center screed frame 8, and a screed angle adjusting screw 11 is screwed into the nut 9. The adjusting screw 11 is supported by a bearing 14 swingably supported on a shaft 12 extending between the arms 4 so as not to move in the axial direction. An operation handle 10 is fixed to the screed angle adjusting screw 11. Central screed 15 is provided on the frame members extending right and left of central screed frame 8.
Has been fixed. At the front end of the central screed 15 in the traveling direction, the supplied mixture is pressed and the central screed 15 is pressed.
A central screed push plate 15a for feeding a mixture is provided between the lower surface and the roadbed. A widener support frame 16 is fixed to the central screed frame 8. A widener frame 17 is attached to the widener support frame 16 so as to be able to expand and contract in both left and right directions. A circular hole is provided in the widener support frame 16 as a guide in the horizontal direction, and a guide bar 18 of a guide member is fitted in the circular hole so as to freely slide in and out. 17
Has been fixed. The piston rod 1 of the hydraulic cylinder provided in the widener support frame 16 is mounted on the widener frame 17.
9 is fixed. The widener frame 17 is provided with a widener screed push plate 21a for feeding the mixture between the ironing portion of the widener screed 21 and the roadbed while pushing the mixture similarly to the central screed 15,
The push plate 21a is supported on the widener support frame 16 so as to be able to freely enter and exit. The center screed 15 is located forward of the widener screed 21 in the traveling direction of the vehicle, and both ends overlap. The lower surfaces of the widener screed 21 and the central screed 15 are on the same plane. As shown in FIG. 4, a vertical clevis type hydraulic cylinder 22 pivotally attached to both ends of the chassis frame 1 and the arm 4 rotates the arm 4 about the pin 13 to move the screed device 5 up and down. . The screed device 5 includes a vibrating device for the screeds 15 and 21 (not shown). In operation, the vehicle is advanced, the clevis type hydraulic cylinder 22 is extended, and the arm 4 is rotated about the pin 13 to lower the screed device 5 to a required paving surface. When a dairy mixture (hereinafter referred to as a mixture) is supplied, the dairy mixture is sent to the screw blades 26 by the conveyor 25 moving in the direction of arrow B in the figure, and is sent to the left and right sides by the screw blades 26 arranged at right angles to the traveling direction. The screed is spread on the roadbed, is pushed by the central screed 15 and the widener screed 21 by the advance of the asphalt finisher, and is heated and pressed by the lower surfaces thereof. FIG. 5 is a plan view showing the rear part of the chassis frame 1 and showing the screw blades 26. In the above description, the screw blade 26 includes a chain case 28 fixed to the chassis frame 1 as shown in FIG.
The chassis frame 1 is supported by a support device 38 fixed to the rear end plate 1a. A chain transmission device 27 is fixed to the chassis frame 1. The chain transmission device 27 is housed in a chain case 28, is rotatably supported by the chain case 28, and is driven independently of the left and right input shafts 2.
A chain 34 is hung between each of the chain wheels 31 fixed to 9 and a chain wheel 33 fixed to a drive shaft 32 that is independent on the left and right sides parallel to the axle of the wheels 2. The input shaft 29 is connected to a power transmission device (not shown) so as to transmit torque from the internal combustion engine.
The drive shaft 32 is rotatably supported by the chain case 28,
One end of each screw blade 26 is connected so as to transmit a rotational force to the drive shaft 32. The screw blades 26 arranged on the left and right sides of the chain transmission device 27 have different twisting directions, and the thrust generated when rotating so as to feed the mixture in the direction of arrow C in FIG. The chain case 28 receives it. Screw blade 26
Is rotatably supported by a support device 38 fixed to the rear end plate 1a of the chassis frame 1. An extended screw blade 37 concentric with the screw blade 26 is detachably fixed to the support device 38. FIG. 6 is a longitudinal sectional view of a driving-side support device 30 for the screw blade 26 at a central position in the left-right direction of a conventional asphalt finisher. A bearing housing 43 is fitted in the mounting hole 28a of the chain case 28, and a bolt 44 is screwed into the chain case 28 through a flange of the bearing housing 43. The chain case 28 is fixed to the chassis frame 1 and can be regarded as a part of the chassis frame 1 when viewed as a fixing member. The outer ring of a ball bearing 46 with seals on both sides is fitted in the cylindrical inner periphery 43a of the bearing housing 43, and the inner ring of the ball bearing 46 is fitted in the drive shaft 32, and the ball bearing 4
The ball bearing 46 is fixed to the drive shaft 32 by a set screw 48 screwed in the radial direction of the inner ring 6. Drive shaft 32
A chain wheel 33 is fixed to one end protruding into the chain case 28 by welding. The other end of the drive shaft 32 passes through a heat-resistant shaft sealing member 63, and the tip of the drive shaft 32 slides into the hollow shaft portion 26 a of the screw blade 26, and
Penetrates through the long hole 32a of the hollow shaft portion 26a and the drive shaft 32, and is strongly driven into the hollow shaft portion 26a to form the long hole 32a.
Are fitted so as to be movable in the axial direction. A shaft sealing cover 49 is fitted into the bearing housing 43, and a bolt 52 inserted through the shaft sealing cover 49 is screwed into the bearing housing 43. A circumferential groove 49a in which the shaft sealing member 63 is fitted is fitted in a center hole 49b of the shaft sealing cover 49 through which the drive shaft 32 is inserted, and the shaft sealing member 63 is fitted in the groove 49a. [0010] When the asphalt finisher having such a configuration is operated, the drive shaft 3 is driven in about one year.
2. Remarkable wear of the ball bearing 46 and the chain wheel 33 is observed. Even if the ball bearing 46 and the chain wheel 33 are replaced and maintenance is continued, it takes about four years for the bearing housing 4.
3. The shaft seal cover 49 cannot be used due to wear caused by the mixture. In the above, the shaft sealing member is a naflon-impregnated blade packing (manufactured by Nippon Asbestos Co., Ltd.).
This is a chemical packing impregnated with a TFE diversion and a small amount of a special lubricant, and hardly any wear of the shaft sealing member is recognized even in the above-described abrasion state of the drive shaft, the ball bearing and the chain wheel. SUMMARY OF THE INVENTION It is an object of the present invention to provide a drive-side support device for a screw blade for feeding a mixture in an asphalt finisher provided with a bearing device with a shaft sealing device for a screw blade in which the mixture does not enter. Means for Solving the Problems Sent by a conveyor 25,
The mixture sent to the left and right by the screw blade 26 is composed of sand, gravel and pitch. The thrust generated on the screw blade 26 is determined by the thrust collar 35 when the shaft seal cover 49 or the hollow shaft portion 26 of the screw blade 26 is mounted.
a while sliding. Accordingly, the screw blade 26 receives a force in the direction opposite to the arrow C in FIG. The support device 38 supports the cylindrical journal with a bush bearing, and the axial movement of the screw blade 26 in the direction of arrow C is received on the side surface of the support device 38. When a gap is formed between the thrust collar 35 and members sliding with the thrust collar 35 and between the hollow shaft portion 26a of the screw blade 26 and the support device 38 due to wear, the screw blade 26 moves in the direction of arrow C due to load fluctuation. A small gap may be formed between the thrust collar 35 and the member sliding with the thrust collar 35, so that the mixture may enter.
From this small gap, the mixture that has entered between the shaft seal cover 49 and the drive shaft 32 starts to grind the drive shaft 32 at the end of the contact surface between the shaft seal member 63 and the drive shaft 32, and sequentially in this contact surface. The drive shaft 32 is ground. Since the mixture and the shaft sealing member 63 do not relatively move in the circumferential direction, the shaft sealing member 63 hardly wears, and conversely, it is considered that the shaft sealing member 63 is a lap table that wears the drive shaft 32. As the wear of the drive shaft 32 progresses at the position of the shaft sealing member 63, the mixture becomes a ball bearing 46.
Of the bearing seals on one side of the bearing, and wears these bearing seals and the ball bearing 46. Then, it enters the gap between the other one of the bearing seals and wears the bearing seals. When the wear of these bearings increases, the mixture enters the chain wheel 33. Thereby, the chain wheel 33,
The chain 34 is worn and the chain wheel 31 is worn. The present invention has been made based on the above considerations, and the first invention of the present invention is a composite material feeding conveyor for feeding the supplied composite material from the front to the rear of the vehicle. And, there is a screw blade that distributes the mixture sent by the conveyor to the left and right, and the screw blade that distributes the mixture sent by the conveyor to the left and right is separated at the center position in the left and right direction of the asphalt finisher. In the drive side support device for the screw blade for feeding the mixture of the asphalt finisher supported by the chain case so that each of the left and right screw blades receives the driving force, one end was connected to the screw blade shaft and the chain wheel was fixed to the other end. A drive shaft, a bearing for bearing the drive shaft,
A bearing housing mounted with the bearing and fixed to a chain case; and a shaft sealing member mounted on the bearing housing side between the bearing and the screw blade, wherein the shaft sealing member is closely fitted to the drive shaft. co When provided a circumferential groove
, The screw blade and drive shaft can move freely in the axial direction and transmit torque.
A driving side support device for a screw blade for feeding a mixture material of an asphalt finisher, which is connected in such a manner as to be described above. Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 corresponds to FIG. 6 of the conventional example.
In FIG. 6, the same parts as those in FIG. FIG. 1 shows a drive-side support device at a central position in the left-right direction of the asphalt finisher of the screw blade 26 for feeding the mixture shown in FIG. 5 toward the left and right sides of the flow sheet finisher. Bearing housing 43
A ball bearing 46 is fitted into the inner periphery 43a of the rim. The shaft seal cover 41 is attached as a part of the bearing housing 43. A shaft-sealing member support ring 42 is fitted into the cylindrical recess 41a of the ring-shaped shaft-sealing cover 41 having an annular cross section in the drawing, and the shaft-sealing member supporting wheel 42 is pressed by a small screw 45 screwed into the shaft-sealing cover 41. And as a detent. The shaft sealing member support wheel 42 is provided with an enlarged diameter portion 43 b of an inner circumference 43 a of the bearing housing 43.
When the bolt 52 is screwed into the bearing housing 43 by passing the shaft sealing cover 41 through the shaft sealing member 41, the shaft sealing member support wheel 42 is immovable in the axial direction and the circumferential direction. On the side surface 42a of the shaft sealing member support ring 42, which is in contact with the bottom of the cylindrical recess 41a of the shaft sealing cover 41, a cylindrical shaft sealing member accommodating portion 42b having a cylindrical concave shape is provided. The outer peripheral side of the shaft sealing member 47 is fitted and housed in the housing portion 42b. The outer periphery of the shaft sealing member 47 is a cylindrical shaft sealing member accommodation portion 42b.
The outer peripheral side of the shaft sealing member 47 is in pressure contact with the side surface of the cylindrical shaft sealing member accommodating portion 42b and the bottom surface of the cylindrical concave portion 41a of the shaft sealing cover 41. The drive shaft 32 is provided with a circumferential groove 62 having a rectangular cross section in the drive shaft 32 so as to substantially coincide with the bottom of the cylindrical concave portion 41a of the shaft seal cover 41 and the bottom surface of the cylindrical shaft seal member accommodating portion 42b of the shaft seal member support ring 42. is there. The groove 62 has a rectangular shape, and the shaft sealing member 47 is fitted into the groove 62 with a small gap so as to slide. The width of the shaft sealing member 47 is slightly smaller than the width of the groove 62, and the inner diameter is slightly larger than the diameter of the groove bottom of the groove 62.
The material and configuration of the shaft sealing member 47 is a naflon-impregnated blade packing as in the conventional example. Further, similarly to the well-known shaft sealing member shape, a circumferential portion is cut in a radial direction or an oblique direction with respect to the radial direction, and can be separated. Alternatively, in the case where the shaft sealing member 47 is made of a material having elasticity and restoring the original shape, the ring may be a continuous ring. The drive shaft 32 has a gap with each of the center holes 41c and 42c of the shaft seal cover 41 and the shaft seal member support wheel 42, and is loosely inserted. The hollow shaft 26a of the screw blade 26 and the drive shaft 3
Numeral 2 indicates that the screw blade 26 and the drive shaft 32 transmit rotational force but are relatively movable in the axial direction. For this purpose, the pin 51 extends across the diameter of the drive shaft 32 and
6a, the pin 51 is in sliding contact with the axially long hole 32a of the drive shaft 32. As shown in FIG. 2, an input shaft 29 has a bearing bracket 29b fixed to a chain case 28 by bolts 29c.
And is fixedly supported by a ball bearing 29a fitted in the ball bearing. The method of assembling and disassembling the shaft sealing member 47 will be described. This disassembly and disassembly are performed in a state where the bearing housing 43 is not attached to the chain case 28. The ball bearing 46 is fitted into the drive shaft 32 and pushed toward the chain wheel 33, and the bearing housing 43 is fitted into the ball bearing 46 to form the chain wheel 33.
Push it to the side. Next, the shaft sealing member support wheel 42 is inserted into the drive shaft 32, and moves to the back. Then, the shaft sealing member supporting wheel 42 comes into contact with the outer ring of the ball bearing 46, and the drive shaft 3
Since the circumferential groove 62 provided in 2 comes to the right of the shaft sealing member support ring 42 in FIG. 1, the shaft sealing member 47 is fitted into the groove 62. Here, the shaft sealing member support wheel 42 is moved rightward in FIG.
Fits. At this time, the shaft sealing member 47 is tightly fitted into the cylindrical shaft sealing member accommodating portion 42b in a state where the cut provided at one position of the shaft sealing member 47 is in pressure contact. The bearing housing 43 moves rightward and the enlarged diameter portion 43 of the inner periphery 43 a of the bearing housing 43 is moved.
b is fitted to the shaft sealing member support wheel 42. The shaft seal cover 41 is inserted into the drive shaft 32 from the right side, the cylindrical recess 41a is fitted to the shaft seal member support wheel 42, the small screw 45 is screwed into the shaft seal cover 41, and the bolt 52 is screwed into the shaft seal cover 41. It is inserted and screwed into the bearing housing 43. Then, the ball bearing 46 is moved on the drive shaft 32, and a set screw 48 is screwed into the inner ring of the ball bearing 46 at a predetermined position, and the ball bearing 46 is moved to the drive shaft 32.
Fixed to. In the unit assembled as described above, the bearing housing 43 is fitted into the mounting hole 28a of the chain case 28, and the bolt 44 is screwed into the chain case 28 through the flange of the bearing housing 43. The chain 34 is opened between a chain wheel 31 and 33 by opening a chain case cover (not shown). The screw blade 26 has its hollow shaft portion 26a fitted to the drive shaft 32, and the pin 51 is inserted into the long hole 32a of the drive shaft 32 and driven into the hollow shaft portion 26a. The disassembling order of the shaft sealing member 47 is performed in the reverse order of the assembly. The operation of the above configuration will be described. When the input shaft 29 rotates, the rotation of the chain wheel 31 is transmitted to the chain wheel 33 via the chain 34 and rotates the drive shaft 32. The rotation of the drive shaft 32 is carried out via the pin 51 through the screw blade 26.
Conveyed to. The mixture is separated from the end of the conveyor 25 and falls onto the bearing housing 43 and the screw blade 26 near the bearing housing 43. The drive shaft 32 rotates while being supported by a ball bearing 46, and the shaft sealing member 47 is stationary.
2 and the shaft sealing member 47 are sliding. As shown in FIG. 5, the mixture is sent in the direction of arrow C. Therefore, the screw blade 26 receives the reaction force of the feed force of the mixture, and the thrust collar 35 presses the shaft sealing cover 41. However, as described above, a gap may be formed between the thrust collar 35 and the member that slides on the thrust collar 35 due to the movement of the screw blade 26, and the gap between the drive shaft 32 and the center hole 41c of the shaft seal cover 41 may be formed. Mixtures penetrate into. Since the shaft sealing member 47 is fitted in the groove 62 provided on the drive shaft 32, the composite material which is to enter between the side surface of the groove 62 and the side surface of the shaft sealing member 47 is driven. Axis 3
Since 2 is rotating, it receives a force that displaces it outward in the radial direction. Since the shaft sealing member 47 is fitted in the groove 62, a labyrinth effect also works, so that the mixture does not enter the ball bearing 46 through the space between the shaft sealing member 47 and the drive shaft 32.
The above operation is the same even if the thrust collar 35 or its sliding member is worn. In the embodiment, the end supporting device 38 of the screw blade 26 is also devised in the same manner as the driving support device 30 for the screw blade at the center position in the left-right direction of the asphalt finisher. FIG. 7 is a longitudinal sectional view of the support device 38. The same shaft sealing is performed on both sides where the screw blade 26 and the extended screw blade 37 are provided, and the following mainly describes the screw blade 26 side. The bracket 57 is fixed to the chassis frame 1. A bearing 56 is press-fitted into a cylindrical inner periphery 53a of the bearing housing 53. The bearing 56 is a cast iron or needle bearing. A journal 71 is provided with a circumferential groove 72 having a rectangular cross section, with one side corresponding to the outer end surface 56a of the bearing 56 being aligned. The groove 72 has a square shape, and the shaft sealing member 73 is fitted into the groove 72 with a small gap so as to slide. The width of the shaft sealing member 73 is slightly smaller than the width of the groove 72, the inner diameter is slightly larger than the diameter of the groove bottom of the groove 72, and the outer diameter is the inner circumference 5 of the bearing housing 53.
3a. The material and configuration of the shaft sealing member 73 is a naflon-impregnated blade packing as in the conventional example, and a cut is provided at one location in the circumferential direction in the radial direction or in a direction oblique to the radial direction. The hollow shaft portion 26a of the screw blade 26 and the journal 71 are in sliding contact with each other.
Transmits rotational force but is relatively movable in the axial direction. For this purpose, the pin 61 is pressed into the hollow shaft portion 26a of the screw blade 26 across the diameter of the journal 71,
Reference numeral 1 is fitted in the axially long hole 71a of the journal 71. The shaft sealing member 59 includes the shaft sealing cover 59 and the bearing 56 which are fitted into the cylindrical fitting portions 53b at both ends of the bearing housing 53.
3 is sandwiched. The end face of the shaft seal cover 59 is rubbed against the end face of the hollow shaft portion 26a of the screw blade 26, and the thrust collar 3 of the screw blade drive-side support device 30 at the center of the asphalt finisher in the left-right direction.
In conjunction with 5, the screw blade 26 is prevented from moving in the axial direction. However, due to sand or the like contained in the mixture, the contact surface between the hollow shaft portion 26a of the screw blade 26 and the shaft sealing cover 59 or the sliding surface between the thrust collar 35 and the hollow shaft portion 26a end surface of the screw blade 26 is reduced. Since it is worn, the screw blade 26
Move in the axial direction, but the drive shaft 32 and the journal 71 are provided with the long hole 32a and the long hole 71a, so that the drive shaft 32 and the journal 71 do not receive thrust. The extension screw blade 37 has a hollow shaft portion 37a fitted to the journal 71, and a pin 3 extending over these diameters.
9 are connected. Since the shaft sealing member 73 is fitted in the groove 72 of the journal 71, the mixture does not enter between the bearing 56 and the journal 71, and the hollow bracket 57 fixed to the bearing housing 53. 5 screwed into
The lubrication of the grease from the grease nipple 55 fixed to the lubrication 4
Although it reaches the annular space 53d between the bearings 56 through 3c, the journal 71 does not wear at the position of the shaft sealing member 73, so the amount of lubrication is small (in the conventional example, several grease cartridges are required every day). According to the present invention, a drive shaft provided on a drive-side support device for supporting a center portion of an asphalt finisher in the left-right direction of a screw blade for feeding a mixture of an asphalt finisher to the left and right is provided. Provide a circumferential groove in which the shaft sealing part fits and slides in the screw blade and drive shaft
Are connected so as to be movable in the axial direction and transmit the rotational force, so that it is difficult for the mixture to enter the sliding portion between the shaft sealing member and the drive shaft, and the drive shaft in the sliding portion Wear has been reduced, and conventionally, wear of the drive shaft in the shaft sealing portion → bearing wear → wear of the chain drive member has not been observed. For example, in the conventional example, the mixture entered the chain case in about one year, but even after four years when the shaft seal case became unusable due to the wear of the shaft seal case of the shaft seal portion, the wear was hardly observed. It was recognized that the durability was significantly improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view of an embodiment of the present invention. FIG. 2 is a horizontal sectional view of the chain transmission device. FIG. 3 is a plan view of an asphalt finisher. FIG. 4 is a side view of FIG. 3; FIG. 5 is a plan view showing a feeder for feeding the mixture to the left and right. FIG. 6 is a longitudinal sectional view of a conventional example. FIG. 7 is a longitudinal sectional view of a support device for an end of a screw blade. [Description of Signs] 25 Conveyor 26 Screw blade 27 Chain transmission device 28 Chain case 29 Input shaft 30 Drive side support device 31 Chain wheel 32 Drive shaft 33 Chain wheel 34 Chain 35 Thrust collar 41 Shaft seal cover 42 Shaft sealing member support wheel 43 Bearing housing 45 Machine screw 46 Ball bearing 47 Shaft sealing member 62 Groove

Claims (1)

(57) [Claims 1] A composite material feeding conveyor for feeding the supplied composite material from the front to the rear of the vehicle, and a screw for distributing the composite material sent by the conveyor to the left and right. Screw blades that have blades and distribute the mixture sent by the conveyor to the left and right are cut off at the center position in the left and right direction of the asphalt finisher, and are mounted on the chain case so that each of the left and right screw blades receives driving force. In a driving side support device for a screw blade for feeding a mixture of a supported asphalt finisher, a drive shaft having one end connected to the screw blade shaft and a chain wheel fixed to the other end, a bearing for bearing the drive shaft, and the bearing A bearing housing fixed to the chain case and a shaft sealing member mounted on the bearing housing side between the bearing and the screw blade, wherein a periphery of the drive shaft in which the shaft sealing member is tightly fitted. One Grooves with is provided to the, screw blade and the drive shaft axial direction
A drive-side support device for a screw blade for feeding a mixture in an asphalt finisher, which is connected so as to be movable in a direction and transmit a rotational force .