JP4179608B2 - Belt tension adjuster - Google Patents

Description

  The present invention relates to a belt tension adjusting device applied to a belt transmission device that transmits rotation of a motor or the like to a driven machine such as a pump via a belt.

  2. Description of the Related Art Belt transmission devices that transmit the rotational output of a driving machine such as a motor or engine to a driven machine such as a pump by a belt (endless flexible belt) such as a V belt are widely used. In this type of apparatus, the belt tension changes due to the elongation and abrasion of the belt. For this reason, it is sometimes necessary to adjust the belt tension.

JP 07-81615 JP-A-11-136903 Japanese Utility Model Hei 01-165355 Japanese Utility Model 03-7556

  In Patent Document 1, when fixing the four foot portions of the motor to the motor base, four long holes are provided on the motor base (5) side in the belt tension adjustment direction, and the foot portions are vertically penetrated. A bolt (motor bolt 6) is shown engaged with these elongated holes and tightened. When adjusting the belt, it is necessary to keep the rotating shaft of the motor parallel to the rotating shaft of the driven machine. Such work is said to be centering. Patent Document 1 discloses that a slide base seat (11) that is in close contact with a leg portion of the motor is fixed to the motor base (5) in order to accurately perform the centering. Here, the slide base seat (11) is fixed so as to protrude from the upper surface of the motor base (5) which is the mounting surface of the foot portion of the motor.

  Patent Document 2 discloses a belt tension adjusting device that enables centering of a motor. That is, a bolt that penetrates the foot of the motor in the vertical direction is engaged with a long hole (10) on the motor base (support base 4) side, while a bolt that pushes the motor in the belt tension direction (motor push bolts 13, 14). And a bolt (17) as a means for preventing misalignment that pushes the motor in the opposite direction. That is, a belt is adjusted and centered by adjusting the bolts (13, 14, 17) by sandwiching the motor between two push bolts (13, 14) and one bolt for preventing misalignment. Is what you do.

  Patent Document 3 discloses that the belt tension is adjusted by sliding a reduction gear (2) with a motor mounted on a pair of rails (6, 6) by a feed screw mechanism. However, there is no explanation about centering here.

  Japanese Patent Application Laid-Open No. H10-228561 discloses a motor that is slidably mounted on an inclined motor mounting surface in an inclined direction. That is, a long hole is provided on the inclined surface, and a bolt passed through the foot portion of the motor can be moved in the long hole. However, there is no explanation about centering here.

  Since the slide base seat (11) shown in Patent Document 1 protrudes upward from the upper surface (motor mounting surface) of the motor base (5), depending on the type of motor, it may interfere with the motor and cannot be applied. There's a problem.

  For example, the foot portion of the motor is not necessarily located at both ends in the axial direction of the main body case including the columnar field core, and is usually located inside the both ends of the main body case. In this case, the slide base seat (11) Will interfere with the body case. In addition, a substantially bowl-shaped cover that normally accommodates the internal mechanism is attached to the rear end surface of the main body case (the end surface opposite to the protruding direction of the output shaft). In this case, this cover interferes with the slide base seat (11).

  In the one disclosed in Patent Document 2, it is necessary to perform belt tension adjustment and centering in parallel while adjusting the three bolts (13, 14, 17). For this reason, skill is required for the work, not only the efficiency is low, but also high-precision centering is very difficult. Patent Documents 3 and 4 do not describe centering.

  Moreover, since the thing of the patent documents 1-3 demonstrated above all arrange | positions a volt | bolt and a nut part on the outer side of the foot part of a motor (or reduction gear with a motor), ie, the outer side of the plane projection area of a motor, Occupied area became large and it was difficult to install in a narrow place. In this case, since the tension adjustment is often performed in a narrow place, workability is also poor.

  The present invention has been made in view of such circumstances, and belt tension adjustment and centering can be performed simultaneously with extremely simple and high accuracy, and the work efficiency is good. Provided a belt tension adjustment device that can be applied regardless of the presence or absence of a cover, has a small projecting area outside the motor, has a small installation footprint, is suitable for installation in narrow spaces, and has good workability in narrow spaces For the purpose.

According to the present invention, a first object is a belt tension adjusting device applied to a belt transmission device that transmits rotation of a driving machine to a driven machine via a belt.
A motor base fixed to a fixed base to which the driven machine is fixed;
Sliding seat surfaces formed long in parallel with the belt tension direction in the vicinity of the four corners of the motor base, and long holes parallel and close to these sliding seat surfaces,
A slide base that is removably fixed so that the drive unit is detachable, and a lower surface is in contact with the sliding seat surface of the motor base and can be slid back and forth in parallel with the belt tension direction;
A slide base fixing bolt that penetrates the long hole of the motor base ;
A slide key and a key groove which are interposed between opposing surfaces of the motor base and the slide base and which slidably engage with each other to prevent the driving machine from being misaligned by translating the slide base in the belt tension direction. When,
A feed mechanism that extends to the inside of the motor base below the slide base and moves the slide base in a sliding direction relative to the motor base;
The feed mechanism includes one feed screw that is held parallel to the slide direction on the motor base side and restricted in movement in the slide direction, and one feed screw that protrudes from the bottom surface of the slide base and into which the feed screw is screwed. This is achieved by a belt tension adjusting device comprising a nut member.

The drive unit is detachably fixed to the slide base, and this slide base is guided by a slide key on the motor base and reciprocates in parallel with the belt tension direction. There is nothing to do. For this reason, centering is performed at the same time as the belt tension adjustment, and the adjustment is extremely simple and highly accurate. Here, since the feed mechanism is arranged so as to extend inside the motor base below the slide base, there is no bolt or the like that protrudes outward from the motor. For this reason, an installation occupation area becomes small, it is suitable for installing in a narrow place, and workability | operativity in a narrow place is also good. The feed mechanism is composed of one feed screw and one nut member. That is, it is composed of one feed screw that is held parallel to the slide direction on the motor base side and whose movement is restricted in the slide direction, and one nut member that is fixed to the lower surface of the slide base and into which the feed screw is screwed. . If the head of the feed screw faces the outer surface of the motor base, the slide base can be slid (reciprocated) by reversing the head forward and backward, and workability is good. In particular, since the position of the head may be the side of the motor base on the belt tension side or the side of the belt slack side, the position of the head may be determined in consideration of the working space around the motor installation location. For this reason, workability | operativity can be improved further.
The upper surface of the motor base and the lower surface of the slide base are brought into sliding contact with long sliding seat surfaces in the sliding direction provided in the vicinity of at least four corners of the motor base, and are long in parallel with the sliding direction close to these sliding seat surfaces. Holes are provided, and the bolts that fix the slide base are locked in these long holes, so the sliding seat surface has a higher finishing accuracy, and the flat finishing accuracy of the lower surface of the slide base is increased. Accurate and smooth positioning is possible.

Also, the slide base can be slid and fixed to the long holes near the four corners with bolts. If sliding seat surfaces are provided in parallel on both sides of these long holes, the bolt tightening load will be Since it is received by the seating surface, the occurrence of distortion of the slide base can be prevented (claim 2 ).

In this case, the elongated hole has an inner width wider than the opening width, and a polygonal head such as a square or hexagon of the slide base fixing bolt can be slidably and non-rotatably engaged with the wide hole ( Claim 3 ).

1 is a front view showing a use state of an embodiment of the present invention, FIG. 2 is a front view of a motor and a belt tension adjusting device, FIG. 3 is a left side view, and FIG. 4 is an exploded cross-sectional view of a feed mechanism. FIG. Figure 5 is a diagram illustrating a motor base, (A) is a plan view, (B) is a front view, (C) is V _c -V _c line cross-sectional view, (D) is V _d -V _d line section FIG.

Figure 6 is a diagram likewise illustrating the motor base 6 (A) is a right side view in FIG. 5, (B) is VI _b -VI _b line cross-sectional view, (C) is VI _c -VI _c cross-sectional view taken along line (D) is a VI _d -VI _d line sectional view. 7A and 7B are views showing a slide base, wherein FIG. 7A is a plan view, FIG. 7B is a left side view, FIG. 7C is a front view, and FIG. 7D is a sectional view taken along line VIId-VIId in FIG. .

  In FIG. 1, reference numeral 10 denotes a fixed base, and a pump 12 that is a driven machine is fixed on the fixed base 10. In addition, an electric motor 14 that is a driving machine is attached to the fixed base via a belt tension adjusting device 16 at a predetermined distance from the pump 12. The rotating shaft 18 of the motor 14 and the rotating shaft 20 of the pump 12 are parallel to each other, and a V belt 26 is wound around pulleys 22 and 24 fixed to the rotating shafts 18 and 20.

  The belt tension adjusting device 16 adjusts the tension of the belt 26 by moving the motor 14 in parallel with the winding plane of the belt 26 while keeping the rotary shafts 18 and 20 parallel. The belt adjusting device 16 includes a motor base 28 fixed to the fixed base 10, a slide base 30 that translates on the motor base 28, and a feed mechanism 32 that moves the slide base 30 relative to the motor base 28. With. Here, four legs 34 of the motor 14 are fixed on the slide base 30. The feed mechanism 32 is formed by a feed screw disposed below the slide base 30 and inside the motor base 28.

  The motor base 28 has a rectangular frame shape in plan view as shown in FIGS. 5 and 6, and four mounting legs 36 are provided outside the long side parallel to the sliding direction of the slide base 30. This mounting foot 36 is bolted to the fixed base 10 to fix the motor base 28. Long sliding seat surfaces 38 (38 </ b> A to 38 </ b> F) are provided in the vicinity of the center of the four corners and the long side of the upper surface of the motor base 28 in parallel with the sliding direction of the slide base 30. Here, the sliding seat surface 38 is a surface with improved finishing accuracy so as to contact the lower surface of the slide base 30.

  The four sliding seat surfaces 38A to 38D at the four corners are provided with long holes 40 (40A to 40D) that divide the width direction at the center. As shown in FIGS. 3, 6 </ b> A and 6 </ b> B, the long hole 40 has an internal width wider than the opening width (division interval of the sliding seat surface 38). Inside the long hole 40, a polygonal (for example, square) head of the slide base fixing bolt 42 is slidably and non-rotatably engaged and held, and the bolt 42 is raised from a long opening of the long hole 40. The slide base 30 described later is tightened and fixed.

  The other sliding seat surfaces 38E and 38F are formed long in the vicinity of the center of the long side of the motor base 28 in parallel with the long side. One sliding seat surface 38F is formed with a key groove 44 (see FIGS. 5, 6 (C), and (D)) that crosses the center in the width direction in the longitudinal direction and reaches the long hole 40. A slide key 52 provided on the slide base 30 side, which will be described later, engages with the key groove 44.

  As shown in FIG. 4, the slide base 30 has a rectangular shape in plan view, and its short side is substantially the same as or slightly narrower than the short side of the motor base 28, and its long side is shorter than the long side of the motor base 28. Therefore, the slide base 30 slides in the long side direction substantially within the outer dimensions of the motor base 28. That is, the slide base 30 does not protrude or hardly protrudes outside the motor base 28 when sliding. Since the lower surface of the slide base 30 slides in contact with the sliding seat surface 38 of the motor base 28, at least the sliding finish has a high finishing accuracy.

  As shown in FIG. 7A, bolt holes 46 through which bolts 42 engaged with the long holes 40 of the motor base 28 pass are formed at the four corners of the slide base 30. The slide base 30 is formed with four bolt holes 48 for fixing the foot portion 36 of the motor 14. The motor 14 is fixed to the slide base 30 by bolts 50 (see FIGS. 1 and 2) that pass through the bolt holes 48. The bolt 50 may be screwed into the bolt hole 48 or may be screwed into the nut through the bolt hole 48.

  On the lower surface of the slide base 30, a slide key 52 that engages with the key groove 44 protrudes. The slide key 52 is long in the long side direction. When the slide key 52 is engaged with the key groove 44, the slide base 30 can be slid only in the direction parallel to the key groove 44, and movement and rotation in the short side direction are restricted.

  A nut member 54 of the feed mechanism 32 projects from the lower surface of the slide base 30. The position of the nut member 54 is offset near the center of the slide base 30 in the long side direction and toward the slide key 52 side. The feed mechanism 32 is formed by a feed screw 56 made of a long bolt that penetrates one short side of the motor base 28 from the outside to the inside and whose movement in the longitudinal direction is restricted, and the nut member 54. That is, as shown in FIG. 4, the feed screw 56 passes freely through the wall that becomes the short side of the motor base 28 and extends to the inside of the motor base 28, and moves from the top to the bottom of the motor base 28. It is screwed into the nut member 54 of the slide base 30 protruding. The feed screw 56 has a hexagonal head, a nut 58a held by a spring pin or a split pin that penetrates the feed screw 56, and a washer 58 that is held by the nut 58a and restricted from moving away from the hexagonal head. (Fig. 4) The feed screw 56 is restricted from moving in the longitudinal direction by sandwiching the short side wall of the motor base 28 between the hexagonal head and the washer 58.

  Next, the operation of this embodiment will be described. When adjusting the tension of the V-belt 26, first, the nuts of the four bolts 42 fixing the slide base 30 to the motor base 28 are loosened. The four bolts 42 are slidable in the long hole 40 of the motor base 28. However, since the feed screw 56 of the feed mechanism 32 is screwed into the nut member 54 of the slide base 30, the slide base 30 moves. There is nothing.

  If the hexagon head of the feed screw 56 is rotated with a spanner or the like, the feed screw 56 can move the nut member 54 and the slide base 30 integrated therewith forward and backward. At this time, the bolt 42 moves in the long hole 40 together with the slide base 30. Further, since the slide key 52 of the slide base 30 is engaged with the key groove 44, the slide base 30 translates in the direction perpendicular to the rotation shafts 18 and 20. Therefore, even if the slide base 30 slides, the rotating shaft 18 of the motor 14 is always parallel to the rotating shaft 20 of the pump 12, and it is not necessary to perform a centering operation separately.

  After the tension of the belt 26 is properly adjusted by the rotation of the feed screw 56, the slide base 30 is firmly fixed to the motor base 28 by tightening the nuts of the four bolts 42.

The front view which shows the use condition of one Example of this invention Front view of motor and belt tension adjuster Left side view of motor and belt tension adjuster Cross-sectional view showing disassembled feed mechanism Diagram showing motor base Diagram showing motor base Diagram showing slide base

Explanation of symbols

10 Fixed base 12 Pump (driven machine)
14 Motor (Driver)
16 Belt tension adjusting device 18, 20 Rotating shaft 26 V belt 28 Motor base 30 Slide base 32 Feed mechanism 38 Sliding seat surface 40 Long hole 42 Slide base fixing bolt 44 Key groove 52 Slide key 54 Nut member 56 Feed screw

Claims (3)

In a belt tension adjusting device applied to a belt transmission device that transmits rotation of a driving machine to a driven machine through a belt,
A motor base fixed to a fixed base to which the driven machine is fixed;
Sliding seat surfaces formed long in parallel with the belt tension direction in the vicinity of the four corners of the motor base, and long holes parallel and close to these sliding seat surfaces,
A slide base that is removably fixed so that the drive unit is detachable, and a lower surface is in contact with the sliding seat surface of the motor base and can be slid back and forth in parallel with the belt tension direction;
A slide base fixing bolt that penetrates the long hole of the motor base ;
A slide key and a key groove which are interposed between opposing surfaces of the motor base and the slide base and which slidably engage with each other to prevent the driving machine from being misaligned by translating the slide base in the belt tension direction. When,
A feed mechanism that extends to the inside of the motor base below the slide base and moves the slide base in a sliding direction relative to the motor base;
The feed mechanism includes one feed screw that is held parallel to the slide direction on the motor base side and restricted in movement in the slide direction, and one feed screw that protrudes from the bottom surface of the slide base and into which the feed screw is screwed. A belt tension adjusting device comprising a nut member. 2. The belt tension adjusting device according to claim 1 , wherein the sliding seat surface is provided on both sides of the long hole in parallel with the long hole. Long hole opening width narrower than the internal width, the slide base fixing bolts head according to claim 2 which is held engaged slidably and non-rotatably engaged with the inside of the head long hole have a polygonal shape Belt tension adjustment device.

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