JP5926586B2 - Method for forming rotor having vane housing groove and rotating fluid device having rotor by the method - Google Patents

Description

  The present invention relates to a rotary fluid device such as a vane air motor including a rotor that rotates while holding a thin plate-like vane movably in a radial direction.

  The vane type air motor has a rotor housing having a rotor chamber defined by a cylindrical inner peripheral surface, and a rotor with a vane attached to the rotor chamber so as to be eccentric with respect to the rotor chamber, and compressed air is supplied to the rotor chamber. The rotor with vanes is supplied and rotated to generate the rotational driving force of the air motor (Patent Document 1).

  When the rotor rotates, the vane moves in the radial direction in the vane storage groove provided in the rotor, and keeps the sliding engagement with the inner peripheral surface of the rotor chamber. Therefore, the vane is subjected to great wear due to contact with the side wall surface of the vane storage groove, particularly with the opening edge corner portion of the vane storage groove. The following Patent Document 2 discloses a technique of performing R chamfering by burnishing on the edge portion of the opening in order to reduce such wear.

JP 2010-159689 A JP 2009-220225 A

  Specifically, Patent Document 2 includes a cylindrical roller that is rotatable, and an annular projecting portion provided at the center in the width direction of the cylindrical outer peripheral surface of the roller. An R chamfering tool is disclosed in which the outer peripheral surface is connected with a concave curved surface. When R chamfering is performed with this tool, the protrusion is inserted into the groove of the cylindrical material, and the tool is rolled along the groove while pressing the concave curved surface of the tool against the opening edge corner of the groove. Then, the R chamfering by the curved surface is performed.

  In order to improve the performance of the air motor, the inventor of the present application has attempted a design in which the eccentric amount is increased as much as possible so that the outer peripheral surface of the rotor is as close as possible to the inner peripheral surface of the rotor chamber. As a result, when R chamfering of the opening edge corner portion of the vane storage groove is performed using the tool according to Patent Document 2, the material pressed to the chamfer and pushed sideways swells on the outer peripheral surface of the rotor material. It has been found that this may hinder the outer peripheral surface of the rotor from approaching the inner peripheral surface of the rotor chamber.

  The present invention has been made on the basis of such knowledge, and a method of forming a rotor by chamfering an R while chamfering material on the outer peripheral surface of the rotor, and a rotary fluid device including a rotor formed by the method are provided. The purpose is to provide.

That is, the present invention
A housing comprising a cylindrical rotor having a vane storage groove formed to extend in the longitudinal direction and a radial direction, and a rotor chamber having a cylindrical inner peripheral surface for storing the rotor, the rotation center axis of the rotor And a housing for accommodating the rotor in a state of being eccentric from the central axis of the cylindrical inner peripheral surface of the rotor chamber, and the vane accommodated in the vane accommodating groove is accommodated as the rotor rotates. A method of forming the rotor in a rotating fluid device adapted to slide with the cylindrical inner peripheral surface of the rotor chamber while being displaced in a radial direction in a groove,
For the cylindrical rotor material, forming a vane housing groove that opens in the longitudinal axis direction on the outer circumferential surface of the rotor material and extends in the radial direction of the outer circumferential surface;
A projecting portion having both side surfaces corresponding to both side walls of the vane storage groove, an R chamfering surface extending gradually laterally while curving in a concave shape from a base portion of the projecting portion, and the R chamfering surface Subsequently, an R chamfering tool provided with a tool body having a deforming pressing surface extending sideways is prepared, and the protruding portion of the R chamfering tool is inserted into the vane storage groove of the rotor material, thereby the bay R chamfering surface. Is pressed against the opening edge corner portion of the vane storage groove to round the chamfer of the opening edge corner portion, and the outer periphery of the rotor material is located at a position where the deformation pressing surface is further away from the chamfered portion. The space between the outer peripheral surface and the deformation pressing surface is such that the material of the opening edge corner portion that extends in contact with the surface and is deformed laterally by the R chamfer rises on the outer peripheral surface of the rotor material. Step of blocking by pressing with the deformation pressing surface within ,
A method for forming a rotor is provided.

  According to this method, when the chamfered edge portion of the vane storage groove of the rotor material is chamfered, even if the extruded material for chamfering rises from the outer peripheral surface of the rotor material, the rise is Is pressed by the deformation pressing surface in a state confined in the space between the deformation pressing surface of the R chamfering tool that comes into contact with the outer peripheral surface of the rotor and the outer peripheral surface of the rotor material, and is prevented from rising above a certain level. . Here, contact with the outer peripheral surface does not necessarily mean that the contact with the outer peripheral surface is physically complete, and the raised portion pressed by the deformation pressing surface is pushed out from the space between the pressing surface of the tool and the outer peripheral surface of the rotor material. It also includes a state close enough to substantially prevent this. Therefore, compared to the case where such a swell cannot be prevented, the rotor can be set more eccentric in the rotor chamber, and the outer surface of the rotor can be brought closer to the cylindrical inner peripheral surface of the rotor chamber. The performance of the rotating fluid device can be improved.

Accordingly, the present invention is also a cylindrical rotor formed by the above method, formed so as to extend in the longitudinal direction and the radial direction, and having a vane storage groove in which a thin plate-like vane is stored so as to be displaceable in the radial direction;
A rotor chamber having a cylindrical inner peripheral surface for storing the rotor, the rotor chamber storing the rotor in a state in which the rotation center axis is eccentric from the center axis of the cylindrical inner peripheral surface of the rotor chamber; A housing comprising;
A rotating fluid device is provided.
For the reasons described above, a rotating fluid device with good performance can be obtained.

  Hereinafter, an embodiment of an R chamfering tool according to the present invention will be described with reference to the accompanying drawings.

It is a vertical side view of the vane type air motor provided with the rotor formed by the method concerning the present invention. It is the figure seen along the II-II line of FIG. It is the figure seen along the III-III line of FIG. It is a principal part expanded sectional view which shows the vane in the vane type air motor of FIG. 1, and the vane accommodation groove | channel formed in the rotor in order to accommodate this vane. It is a front view of the R chamfering tool which concerns on this invention. It is an expanded sectional view of the part enclosed with the circle | round | yen of FIG. 5, and shows the cyclic | annular protrusion part and the R chamfering surface extended to the side from the root, and a deformation | transformation press surface following it.

  A vane type air motor (rotating fluid device) 10 shown in FIG. 1 includes a cylindrical body 14 having a cylindrical inner peripheral surface 11 (FIG. 2), and first and second end walls 16 provided at both ends of the cylindrical body. 18, a rotor housing 20 in which a rotor chamber 19 is formed, a rotor 22 provided eccentrically in the rotor chamber, a plurality of vanes 24 attached to the rotor, and the rotor housing 20 from both ends of the rotor. A support shaft portion 28 and an output shaft portion 26 that extend along the rotation axis of the rotor and are respectively supported by first and second end walls, and a governor 30 is attached to the end of the support shaft portion 28. It has been. The output shaft portion 26 is drivingly connected to a rotating shaft 36 of a disc-shaped polishing member 32 via a bevel gear 34.

  The rotary shaft 36, the vane air motor 10, and the governor 30 are housed in a casing 38 made up of a plurality of casing parts 38-1 to 38-3 of the pneumatic grinder. The casing part 38-3 is adapted to receive compressed air via a hose 40 connected to an air pump (not shown), and the received compressed air passes through the communication hole 42 penetrating the casing part 38-2. A compressed air supply chamber 44 formed around the governor 30 by the casing part 38-2 and the first end wall 16 is supplied to the compressed air supply chamber 44, and the compressed air is further shown in the drawings of the first end wall 16 and the cylindrical body 14. 1, the air is supplied to the rotor chamber via the air supply holes 46 and 48 provided at the upper position, and acts on the vane 24 to rotate the rotor 22 and to rotate the polishing member 32. The compressed air that has acted on the vane 24 is discharged out of the casing through the exhaust hole 49 and an exhaust passage provided in the casing (not shown).

  In FIG. 1, the air supply holes 48 and the exhaust holes 49 are drawn so as to face each other in the diametrical direction for the sake of explanation, but actually, as can be seen from FIGS. A plurality of exhaust holes 49 are provided at intervals in the circumferential direction of the cylindrical body, and a plurality of exhaust holes 49 are provided at positions shifted from the opposing positions in the diameter direction. The air supply hole 48 communicates with the rotor chamber 19 through one air supply opening 61 (FIG. 2) provided so as to extend in the circumferential direction at a substantially central position in the axial direction of the cylindrical body 14.

  The air discharge openings 50 of the exhaust holes 49 are provided in the arrangement shown in FIG. 3 in the left half instead of the substantially right half in which the air supply openings 61 are provided as viewed in FIG. That is, these air discharge openings 50 are provided at the substantially central position in the axial direction of the cylindrical body 14 and one large-diameter air discharge opening 50-1 is provided at an upper position as viewed in FIG. Each of the three small-diameter air discharge openings 50-2 is arranged so as to form a lame shape as a whole, and an additional large-diameter air discharge opening 50-3 is formed at a lower position as viewed in FIG. Has been.

  As shown in FIG. 4, in order to improve the durability of the vane 24, the opening edge corner portion 21-1 of the vane storage groove 21 formed in the rotor 22 is R-chamfered. That is, when compressed air is supplied in this air motor and the rotor is rotated in the direction indicated by the arrow B, the vane rotates while sliding with the cylindrical inner peripheral surface 11 of the rotor housing, so that the vane is rotated in the direction indicated by the arrow A. Receive power. For this reason, the vane enters and exits the vane storage groove 21 in the radial direction in a slightly inclined state. Therefore, the side surface of the vane slides in a state of being pressed against the opening edge corner portion 21-1 of the vane storage groove, and the side surface is worn, and the side surface is slightly worn out. It will be. When such erosion occurs, cracks are likely to occur due to the impact of the vane due to rotation. The R chamfering of the opening edge corner portion 21-1 reduces the erosion due to such wear.

  FIG. 5 shows a chamfering tool 60 according to the present invention for carrying out the R chamfering of the opening edge corner portion 21-1 of the vane storage groove 21 described above. The chamfering tool 60 includes a tool main body 62 that is substantially disk-shaped or cylindrical as a whole, and an annular protrusion 64 that protrudes from the center in the width direction of the outer peripheral surface 63 of the tool main body 62. The chamfering tool 60 is supported so as to be rotatable around the central axis C of the tool main body 62 by a pressurizing and moving device (not shown) (with respect to a cylindrical rotor material made of steel material on the outer circumferential surface in the longitudinal axis direction). While applying a pressing force F (FIG. 6) to the rotor material X (FIG. 6) which is opened and prepared to form a vane storage groove 21 formed to extend radially from the outer peripheral surface, the vane The chamfering tool rolls along the storage groove 21 and presses the opening edge corner portion 21-1 of the vane storage groove 21 to perform the above-mentioned R chamfering.

  Specifically, the annular projecting portion 64 has a pair of smooth side surfaces 64-1 parallel to each other and spaced substantially equal to the width between both side wall surfaces 21-1 of the vane storage groove 21, The tip end portion 64-2 is tapered so that the annular protrusion 64 can easily enter the vane storage groove 21. The outer peripheral surface 63 of the tool main body 62 includes an R chamfering surface 63-1 extending sideways while being gradually concavely curved from the smooth side surfaces 64-1 on both sides of the base portion of the annular protrusion 64, and the R chamfering surface. And a deformation pressing surface 63-2 extending laterally.

  The deformation pressing surface 63-2 is slightly angled with respect to the smooth side surface 64-1 so as to approach the rotor material X as the distance from the smooth side surface 64-1 increases. Then, the material of the opening edge corner portion 21-1 to be deformed is pushed sideways and pressed on the cylindrical outer peripheral surface X-2 of the rotor material X to press the rising X-1, thereby suppressing the rising. To do. This is a feature different from the R chamfering tool disclosed in the above-mentioned Patent Document 2 in that the outer peripheral surface of the tool body is perpendicular to the smooth side surface 64-1.

  In short, in the chamfering tool 60 according to the present invention, the swell X-1 which is deformed along with the R chamfering and is likely to be generated on the cylindrical outer peripheral surface X-2 of the rotor material X is converted into the cylindrical outer peripheral surface X-2. And the pressing portion 63-2 are pressed in a minute gap formed between the pressing surface 63-2 and the deformation pressing surface 63-2 to suppress excessive swell. By doing so, it is possible to set the rotor closer to the inner peripheral surface of the rotor chamber than in the case where such swell cannot be suppressed, and accordingly, the rotary fluid device including the rotor can be set. The performance can be improved.

  When R chamfering is performed, the material to be deformed is pushed into the vane storage groove 21, and unevenness may occur on the side wall surface of the vane storage groove 21. In order to prevent such unevenness, when the width of the annular protrusion 64 is slightly larger than the width of the vane storage groove 21 and the annular protrusion 64 is pushed into the vane storage groove 21, the smooth side surface 64. It is preferable to press the side wall surface 21-2 of the vane storage groove with -1.

  As mentioned above, although the tool for performing R chamfering of the opening edge corner part concerning the present invention was used as an example for the vane storing groove of a rotor with a vane, the present invention is not limited to this, It can be used to round the chamfer of the opening edge corner portion of a cylindrical rotor material having grooves extending in the direction.

Vane type air motor (rotating fluid device) 10: cylindrical inner peripheral surface 11; cylindrical wall 14; first end wall 16; second end wall 18; rotor chamber 19; rotor housing 20; Portion 21; Rotor 22; Vane 24; Output shaft portion 26; Support shaft portion 28; Governor 30; Polishing member 32; Bevel gear 34; Rotating shaft 36; Casing parts 38-1 to 38-3; Communication hole 42; compressed air supply chamber 44; air supply holes 46 and 48; exhaust hole 49; air exhaust openings 50, 50-2, 50-2 and 50-3; chamfering tool 60; tool body 62; Annular protrusion 64; smooth side surface 64-1; tip portion 64-2; R chamfering surface 63-1; deformation pressing surface 63-2; rotor material rising X-1; 2

Claims (2)

A housing comprising a cylindrical rotor having a vane storage groove formed to extend in the longitudinal direction and a radial direction, and a rotor chamber having a cylindrical inner peripheral surface for storing the rotor, the rotation center axis of the rotor And a housing for accommodating the rotor in a state of being eccentric from the central axis of the cylindrical inner peripheral surface of the rotor chamber, and the vane accommodated in the vane accommodating groove is accommodated as the rotor rotates. A method of forming the rotor in a rotating fluid device adapted to slide with the cylindrical inner peripheral surface of the rotor chamber while being displaced in a radial direction in a groove,
For the cylindrical rotor material, forming a vane housing groove that opens in the longitudinal axis direction on the outer circumferential surface of the rotor material and extends in the radial direction of the outer circumferential surface;
A projecting portion having both side surfaces corresponding to both side walls of the vane storage groove, an R chamfering surface extending gradually laterally while curving in a concave shape from a base portion of the projecting portion, and the R chamfering surface Subsequently, an R chamfering tool provided with a tool body having a deforming pressing surface extending sideways is prepared, and the protruding portion of the R chamfering tool is inserted into the vane storage groove of the rotor material, thereby the bay R chamfering surface. Is pressed against the opening edge corner portion of the vane storage groove to round the chamfer of the opening edge corner portion, and the outer periphery of the rotor material is located at a position where the deformation pressing surface is further away from the chamfered portion. The space between the outer peripheral surface and the deformation pressing surface is such that the material of the opening edge corner portion that extends in contact with the surface and is deformed laterally by the R chamfer rises on the outer peripheral surface of the rotor material. A step of pressing by the deformation pressing surface to prevent
A method of forming a rotor. The deforming pressing surface of the R chamfering tool is located on the side from the protruding portion when the protruding portion is inserted into the groove and the R chamfering surface is pressed against the opening edge corner portion to perform R chamfering. 2. The method of forming a rotor according to claim 1, wherein the rotor member is angled so as to approach the cylindrical member as it moves away from the chamfer and to contact the outer peripheral surface at a position farther to the side than the chamfered portion.

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