JP2005104017A - Mold for rotator with teeth - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mold for molding a rotator with teeth which mold can manufacture rotors or the like having a variety of widths using only one set of constituent mold parts. <P>SOLUTION: Inner rotors 2 with a variety of thicknesses (a) can be manufactured by a single mold by replacing spacers 25 or core pins 26 with a variety of lengths extending in an axis (y) direction. In addition, the spacer 25 can be correctly positioned to a through hole 20 by fitting the inner peripheral teeth 22 and 23 of the through holes 20 and 21 to the outer peripheral teeth 27 of the spacer 25. As a cavity 14 is of a circular shape around the axis (y), an outer rotor 2 can be easily manufactured. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

    The present invention relates to a mold for molding a rotating body having teeth such as an inner rotor, an outer rotor, or a gear of an inscribed gear pump.

  The internal gear pump includes an outer rotor that is rotatably provided in a casing and has inner peripheral teeth, an inner rotor having outer peripheral teeth that are meshed with the inner peripheral teeth of the outer rotor, and supports the inner rotor. And a drive shaft that holds the rotation center of the inner rotor eccentrically from the rotation center of the outer rotor in a predetermined direction.

In such an inscribed gear pump, the discharge amount per hour is determined by the thickness of both rotors, that is, the width in the axial direction, in addition to the shape of the teeth. Therefore, when manufacturing various sizes of rotors corresponding to various discharge amounts per hour using a resin, it has been necessary to manufacture and prepare dies dedicated to rotors of various sizes.
JP-A-6-42469

  The problem to be solved is to provide a mold for forming a rotating body having a tooth portion that can manufacture a rotor having various widths even with a set of molds.

  According to the first aspect of the present invention, a recess having an axial center in a direction orthogonal to the dividing surface is formed in one mold member so as to face the dividing surface, and the axial center is centered on the inner periphery of the recess As described above, a rotating body molding die provided with a tooth portion is characterized in that an inner peripheral tooth is formed and a spacer is detachably inserted into the recess so as to be separated from the dividing surface.

  According to a second aspect of the present invention, there is provided a rotating die having a tooth portion according to the first aspect, wherein outer peripheral teeth fitted to the inner peripheral teeth are formed on the outer periphery of the spacer. .

  A third aspect of the present invention is the molding die for a rotating body having a tooth portion according to the first or second aspect, wherein the recess has a circular shape centered on the axis.

  According to a fourth aspect of the present invention, a recess having an axial center in a direction perpendicular to the dividing surface is formed in one mold member so as to face the dividing surface, and a spacer is separated from the dividing surface in the recess. A tooth that is detachably fitted, and has a core projecting from the surface of the spacer facing the dividing surface toward the dividing surface, and outer teeth are formed on the outer periphery of the core. 3 is a mold for molding a rotating body including a portion.

  In the invention of claim 5, a recess is formed in the facing surface of the spacer, the base end of the core is inserted into the recess, and the outer peripheral teeth are continuously formed in the insertion portion of the core. 5. The mold for molding a rotating body having a tooth portion according to claim 4, wherein an inner peripheral tooth fitted to an outer peripheral tooth provided in the insertion portion is formed in the concave portion.

  A sixth aspect of the present invention is the molding die for a rotating body having a tooth portion according to the fourth or fifth aspect, wherein the recess is cylindrical.

  According to the first aspect of the present invention, by changing the spacer, the depth of the cavity can be changed, and the thickness of the rotating body having the teeth on the outer periphery can be freely adjusted using one mold.

  According to the invention of claim 2, the spacer can be accurately positioned in the recess by fitting the inner peripheral tooth and the outer peripheral tooth.

  According to the third aspect of the present invention, the rotating body has a circular shape centered on the axis, and an external gear and an outer rotor can be manufactured.

  According to the invention of claim 4, by changing the spacer, the depth of the cavity can be changed and the thickness of the rotating body provided with the tooth portion on the inner periphery can be freely adjusted using one mold. .

  According to the invention of claim 5, the core and the spacer can be accurately positioned by fitting the outer peripheral teeth provided in the insertion portion and the inner peripheral teeth of the recess.

  According to the sixth aspect of the present invention, the rotating body has a circular shape centered on the axis, and an external gear and an inner rotor can be manufactured.

  Preferred embodiments of the present invention will be described with reference to the accompanying drawings. The embodiments described below do not limit the contents of the present invention described in the claims. In addition, all of the configurations described below are not necessarily essential requirements of the present invention.

  FIG. 1 shows a first embodiment, and an inscribed gear pump used as an oil pump has a rotating body provided with the other tooth portion in an outer rotor 1 which is a rotating body provided with one tooth portion. The inner rotor 2 is assembled in an eccentric state. The outer rotor 1 has a resin disc body 3 with a center hole 4 formed on the inner periphery of the outer periphery of the disc body 3 around the center axis x of the center, and on the inner periphery. A plurality of inner peripheral teeth 5 are provided. On the other hand, the inner rotor 2 has a resin disc body 6 having the same thickness as the disc body 3 and has a center hole 7 centered on the central axis y and a plurality of outer teeth on the outer circumference. 8. The teeth of the rotors 1 and 2 have conjugated tooth shapes and mesh with each other, but the number of teeth is smaller in the inner rotor 2 than in the outer rotor 1, and the outer rotor 1 is rotatably fitted in a space in a casing (not shown).

  Next, the molding of the inner rotor 2 will be described. As shown in FIGS. 2 to 4, the molding die has a fixed die 12 and a movable die 13, which are a plurality of die members that open and close with respect to each other via a dividing surface 11. A cavity 14 for forming the inner rotor 2 as a product is formed facing the dividing surface 11. On the other hand, the fixed mold 12 is provided with a resin passage 15, and the tip of the resin passage 15 faces the dividing surface 11 and is connected to the cavity 14. The movable mold 13 includes a mold plate 15 as a mold body that forms one of the dividing surfaces 11, a mounting plate 16 as a mounting body to which the mold plate 15 is fixed, and surrounds the mold plate 15 and the mounting plate 16. A mold main body 17 is provided, and the mold plate 15 and the mounting plate 16 are detachably fixed by pins 18 and bolts 19 inserted from the dividing surface side 11, respectively. The mold plate 15 and the mounting plate 16 are coaxially provided with through holes 20 and 21 as recesses having the same diameter as the outer periphery of the cavity 14 around the axis y of the cavity 14, that is, the outer periphery of the inner rotor 2. At the same time, the inner peripheral teeth 22 are formed on the inner peripheral surface of the template 15 around the axis y. The axis y is provided so as to be orthogonal to the dividing surface 11. The width direction (the length in the direction of the axis y) of the inner peripheral teeth 22 is formed on the entire inner peripheral surface with the dividing surface 11 as a starting end and the attachment plate 16 side as an end. Further, inner peripheral teeth 23 are formed on the inner peripheral surface of the mounting plate 16 with the axis y as the center. The inner peripheral teeth 23 have the same shape as the inner peripheral teeth 22, and the width direction (the length in the axial center y direction) of the mounting plate 16 on the opposite side of the dividing surface 11 starting from the template 15 side. It is formed on the entire inner peripheral surface with the bottom surface 24 as an end. In addition, the inner peripheral teeth 23 are provided with tooth shapes such as tooth tips and tooth bottoms so that they coincide with the inner peripheral teeth 22. Further, cores are provided in the through holes 20 and 21 arranged coaxially. This core is provided in the through holes 20 and 21 so as to be separated from the dividing surface 11, and the width of the cavity 14 provided on the bottom surface 24 side of the through holes 20 and 21 as the bottom surface of the recess (in the direction of the axis y) Of the spacer 25, and a core pin 26 provided on the axis y of the spacer 25 and projecting toward the dividing surface 11 side. The spacer 25 forms a bottom member that forms the bottom surface of the cavity 14 by the tip thereof, has a cylindrical shape centered on the axis y, and has inner holes formed in the through holes 20 and 21 on the outer periphery thereof. Outer peripheral teeth 27 are formed to be fitted to the peripheral teeth 22 and 23. A through hole 28 is formed in the central portion of the spacer 25 in the direction of the axis y, and the core pin 26 passes through the through hole 28. A large diameter hole portion is formed at the base end located on the bottom surface 24 side of the through hole 28. 29 is formed. As described above, the spacer 25 forms a bottom member that forms the bottom surface of the cavity 14 by the tip, a tip side member 25b having a through hole 28 and a large diameter hole portion 29 thereof, and the tip side member 25b and the through hole. And a base end member 25c disposed between the base 24 and the bottom surface 24. A through hole 25d is formed on the axis y of the base end member 25c. A female screw is formed. The tip 30 formed with a small diameter of the core pin 26 penetrates the cavity 14 and contacts the dividing surface 11 of the fixed mold 12, and the hole 7 is formed by the tip 30 of the core pin 26 protruding into the cavity 14. The A large-diameter portion 31 is formed in a flange shape at the base end of the core pin 26, and the large-diameter portion 31 engages with the large-diameter hole portion 29 to prevent the core pin 26 from coming off. Therefore, the cavity 14 is formed by a space surrounded by the fixed mold 12, the through hole 20, the spacer 25, and the tip 30 of the core pin 26, and has a thickness a (the length in the direction of the axis y). ) Is equal to the thickness of the bottom surface 24 of the mounting plate 16 and the thickness of the dividing surface 11 minus the thickness of the spacer 25. Further, a pin 32 as a stopper means is provided between the mounting plate 16 and the spacer 25. The pin 32 is provided on a groove 33 formed on the surface of the mounting plate 16 on the dividing surface 11 side and communicated with the through hole 21, and a hole 34 facing the groove 33 is provided on the spacer 25. The tip of the pin 32 is inserted into the hole 34. Then, when the spacer 25 is inserted into the through hole 21 with the tip inserted in advance into the hole 34, the base end of the pin 32 is engaged with the groove 33, so that the spacer 25 is attached to the mounting plate 15 by the pin 32. Can be prevented from rotating.

  When changing to a width b larger than the width a of the cavity 14, a spacer 25a having a short width from the bottom surface 24 (length in the axial center y direction) is attached instead of the spacer 25, and the tip 30a is attached. By inserting the core pin 26a having a longer length into the through hole 28a, the width b of the cavity 14a can be increased. The replaced spacer 25a also forms a bottom member that forms the bottom surface of the cavity 14a by the tip, similarly to the spacer-25, and includes a tip side member 25e having a through hole 28a and a large diameter hole portion 29a, and the tip. A base end side member 25f disposed between the side member 25e and the bottom surface 24 side of the through hole 21 is provided, and a through hole 25g is formed on the axis y of the base end side member 25f. A female screw is formed in the through hole 25g, and the distal end side member 25e and the proximal end side member 25f of the spacer 25a are provided with outer peripheral teeth 27a fitted to the inner peripheral teeth 22 and 23, respectively.

  Next, the operation of the above configuration will be described. With the fixed mold 12 and the movable mold 13 closed, a molten resin such as engineering plastic is formed from the resin passage 15 by a space surrounded by the fixed mold 12, the through hole 20, the spacer 25, and the tip 30 of the core pin 26. The cavity 14 is filled. Thereafter, the inner rotor 2 in which the resin is cooled and solidified to form the predetermined width a can be formed. Next, the mold is opened and the inner rotor 2 is taken out.

  Next, when molding the inner rotor 2 a having a large thickness b, first, the pin 18 and the bolt 19 are removed in a state where the mold is opened, and the template 15 is removed from the mounting plate 16. Next, the spacer 25 composed of the distal end side member 25b and the proximal end side member 25c is taken out together with the core pin 26 and the pin 32. The spacer 25 may be taken out from the bottom surface 24 side of the fixed mold 13 that has been disassembled.

  Then, the spacer 25a shortened in the direction of the new axis y is fitted into the through hole 21 so as to be placed on the bottom surface 24 side. At this time, the rotation of the spacer 25a is prevented by locking the proximal end of the pin 32 having the distal end inserted into the hole 34a of the spacer 25a composed of the distal end side member 25e and the proximal end side member 25f to the groove 33. Next, the molded 15 is attached to the mounting plate 16 via pins 18 and bolts 19.

  After the new spacer 25a is assembled in this manner, when the mold is closed, the cavity 14a formed by the space surrounded by the fixed mold 12, the through hole 20, and the tip 30a of the core pin 26a is filled. And when resin solidifies, the inner rotor 2a with large thickness b can be shape | molded. Thereafter, the mold is opened to take out the inner rotor 2a.

  As described above, in the above-described embodiment, desired spacers 25 and 25a and core pins 26 and 26a having different lengths in the direction of the axis y are selectively selected and exchanged to form an inner rotor having various thicknesses a and b. 2 and 2a can be formed using one mold.

  Also, the spacers 25, 25a can be accurately positioned in the through holes 20, 21 by fitting the inner peripheral teeth 22, 23 of the through holes 20, 21 and the outer peripheral teeth 27, 27a of the spacers 25, 25a. Can do.

  Furthermore, since the cavities 14 and 14a have a circular shape centered on the axis y, the outer rotors 2 and 2a can be easily manufactured.

  5 to 7 show a second embodiment. This second embodiment shows an outer rotor 1 of an inscribed gear pump, and a molding die has a plurality of parts that open and close with respect to each other via a dividing surface 41. A fixed die 42 and a movable die 43 as mold members are provided, and a cavity 44 for forming the outer rotor 1 is formed in the movable die 43 so as to face the dividing surface 41. On the other hand, a resin passage 45 is provided in the fixed mold 42, and the tip of the resin passage 45 faces the dividing surface 11 and is connected to the cavity 44. The movable mold 43 includes a mold plate 46 as a mold body for forming the dividing surface 41, and a mold body 47 provided so as to surround the mold plate 46. Then, a recess 48 is formed in the dividing surface 41 of the template 46. The recess 48 is a bottomed columnar shape having an axis x orthogonal to the dividing surface 41, and a core is detachably provided in the recess 48. The core is fitted to the dividing surface 41 so as to be spaced apart, and the spacer 50 is placed on the bottom surface 49 of the recess 48 to adjust the gap between the dividing surface 41 and the center of the spacer 50. And a core 51 for forming the center hole 4 (inner circumference). The spacer 50 has a substantially cylindrical shape provided at a position where the front end surface 52 is retreated (separated) from the dividing surface 41, and the front end surface 52 is formed with a circular recess 53 centering on the axis x. ing. The spacer 50 forms a bottom member that forms the bottom surface of the cavity 44 by its tip. Inner peripheral teeth 54 are formed around the axial center x on the inner periphery of the recess 53. The recess may be a through hole formed in the template 46 along the axis x. Further, the core 51 inserted in the recess 53 on the base end side as the insertion portion 51b is in contact with the fixed mold 42 with the distal end surface being substantially flush with the dividing surface 41, and the center coincides with the axis x, and the core 51 is the recess. The outer peripheral teeth 55 are continuously formed around the axis x on the outer periphery of the cylindrical body having the same diameter as the diameter of 53. This outer peripheral tooth 55 has the same tooth shape as the inner peripheral tooth 54, and the outer peripheral tooth 55 on the bottom surface side of the concave portion 53 inserted into the concave portion 53 is fitted to the inner peripheral tooth 54, while on the divided surface 41 side The outer peripheral teeth 55 face the cavity 44. The cavity 44 is surrounded by the fixed mold 42, the recess 48, the distal end surface 52 of the spacer 50, and the outer peripheral teeth 55, and is formed in a ring shape centering on the axis x, and its thickness c (c = c = a) is equal to the depth of the recess 48 minus the length of the spacer 50 in the axial center x direction. A bolt 56 serving as a fixing means for fixing the core 51, the spacer 50, and the template 46 integrally is inserted from the core 51 side. Is inserted into a bolt head insertion portion 57 formed on the front end surface of the bolt. Furthermore, the core 51 can be prevented from rotating with respect to the spacer 50 by inserting the other end of the pin 58 having one end inserted into the bottom surface of the recess 53 to fix the spacer 50 and the core 51 into the core 51. it can.

  When the width d (d = b) of the cavity 44a is changed to be increased, a spacer 50a having a short length in the axial center x direction is attached to the recess 48 instead of the spacer 50. By inserting the core 51 into the recess 53 of the spacer 50a again, the width of the cavity 44a can be increased. The replaced spacer 50a also has inner peripheral teeth 54 as in the spacer 50.

  Next, the operation of the above configuration will be described. With the fixed mold 42 and the movable mold 43 closed, a molten resin, such as engineering plastic, is formed from the resin passage 45 by a space surrounded by the fixed mold 42, the recess 48, the tip 52 of the spacer 50, and the outer peripheral teeth 55. The cavity 44 is filled. Thereafter, the resin is cooled and solidified, and the outer rotor 1 can be formed. Next, the mold is opened and the outer rotor 1 is taken out.

  Next, when molding the outer rotor 1a having a large thickness d, first, the bolts 56 and the pins 58 are removed in a mold open state, and the spacer 50 is taken out.

  Then, the spacer 50a shortened in the direction of the new axis y is placed on the bottom surface of the recess 48, and the core 51a is placed on the spacer 50a so as to be inserted into the recess 53a. The core 51a is prevented from rotating by interposing a pin 58 between the core 51a. Further, the spacers 50 a and the core 51 a are fixed to the template 46 with bolts 56.

  When the mold is closed after assembling a new spacer 50a in this way, the cavity 44a formed by the space surrounded by the fixed mold 42, the spacer 50a, the recess 48 and the outer peripheral teeth 55 is filled. When the resin is solidified, the outer rotor 1a having a large thickness d can be formed. Thereafter, the mold is opened to take out the outer rotor 1a.

  As described above, in the above-described embodiment, the outer rotors 1 and 1a having various thicknesses are selected as one mold by selecting and replacing desired spacers 50 and 50a having different lengths in the axis y direction. Can be used for molding.

  Further, by fitting the outer peripheral teeth 55 provided in the insertion portion 51b of the cores 51 and 51a and the inner peripheral teeth 54 of the recesses 53 and 53a provided in the spacers 50 and 50a, the spacers 50 and 50a and the core 51, 51a can be accurately positioned.

  Furthermore, the cavities 44 and 44a are circular with the axis y as the center, and the outer rotors 1 and 1a can be easily manufactured.

  As described above, the present invention can be applied to applications such as gears in addition to the rotor according to the present invention.

1 is an exploded perspective view of an internal gear pump showing a first embodiment of the present invention. FIG. It is sectional drawing which shows 1st Example of this invention. It is sectional drawing of the state which changed the spacer which shows 1st Example of this invention. It is a schematic perspective view of the principal part which shows 1st Example of this invention. FIG. 6 is a sectional view showing a second embodiment of the present invention. It is sectional drawing of the state which changed the spacer which shows 2nd Example of this invention. It is a schematic perspective view of the principal part which shows 2nd Example of this invention.

Explanation of symbols

1,1a Outer rotor (rotary body)
2,2a Inner rotor (rotary body)
5 Inner peripheral teeth 8 Outer peripheral teeth
11 Dividing plane
12 Fixed mold (mold material)
13 Movable type (mold member)
14 cavity
15 Resin passage
20, 21 Through hole (recess)
22, 23 Internal teeth
25, 25a Spacer
27, 27a peripheral teeth
41 Dividing plane
42 Fixed mold (mold material)
43 Movable type (mold material)
44 cavity
45 Resin passage
48 recess
50, 50a Spacer
51, 51a core
51b Insertion part
54 Internal teeth
55 Peripheral teeth xy Axle

Claims (6)

  A mold for forming a rotating body having a tooth portion on the outer periphery, wherein a cavity is formed between a plurality of mold members that open and close to each other via a dividing surface, and a resin passage that leads to the cavity is provided, Forming a recess having an axial center in a direction perpendicular to the dividing surface facing the dividing surface, and forming inner peripheral teeth around the axial center on the inner periphery of the recess, A rotating die having a tooth portion, wherein a spacer is detachably inserted into the recess so as to be separated from the dividing surface.   2. The mold for molding a rotating body having a tooth portion according to claim 1, wherein outer peripheral teeth fitted to the inner peripheral teeth are formed on an outer periphery of the spacer.   The mold for molding a rotating body having a tooth portion according to claim 1 or 2, wherein the recess has a circular shape centered on the axis.   A rotating body mold having a tooth portion on the inner periphery, forming a cavity between a plurality of mold members that open and close to each other via a dividing surface, and having a resin passage leading to the cavity, A recess having an axial center in the direction perpendicular to the dividing surface is formed on one mold member, and a spacer is detachably fitted in the recess so as to be separated from the dividing surface. And a rotating body having a tooth portion, wherein a core protrudes from the surface of the spacer facing the dividing surface toward the dividing surface, and outer peripheral teeth are formed on the outer periphery of the core. Mold for molding.   A concave portion is formed on the facing surface of the spacer, the base end of the core is inserted into the concave portion, and the outer peripheral teeth are continuously formed at the insertion portion of the core, and provided at the insertion portion. 5. The mold for molding a rotating body having a tooth portion according to claim 4, wherein an inner peripheral tooth fitted to the outer peripheral tooth is formed in the concave portion. 6. The mold for molding a rotating body having a tooth portion according to claim 4, wherein the recess has a circular shape centered on the axis.

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