JP7141693B2 - Polishing body for spiral bevel gear and method for polishing spiral bevel gear - Google Patents

Description

TECHNICAL FIELD The present invention relates to a spiral bevel gear polishing body for polishing spiral bevel gears, and a spiral bevel gear polishing method.

In recent years, in the automotive field, where comfort and fuel efficiency are emphasized, there is an increasing demand for improved machining accuracy of gears used in transmissions and differential mechanisms in order to improve tooth surface strength and reduce fuel consumption. there is

Spiral bevel gears are used, for example, in rear differential mechanisms that are connected to propeller shafts of automobiles. A spiral bevel gear is a type of bevel gear with teeth cut on a conical surface, and the tooth tips are formed in a curved (arc) shape. Spiral bevel gears are more durable than regular bevel gears because multiple teeth are meshed with the mating gear at the same time, distributing the load on the teeth. treated as parts.

Conventionally, tooth grinding is used as a method for finishing the tooth flanks of spiral bevel gears (see Patent Document 1, for example). Finishing by tooth grinding uses a grinder with a structure in which the cutter shaft of the generating gear cutter for spiral bevel gears is replaced with a grindstone shaft. The outer conical surface of the cup-shaped grinding wheel is ground by contacting the tooth surface curved in a concave arc on the tooth of the spiral bevel gear, and the inner conical surface of the cup-shaped grinding wheel is curved in a convex arc on the tooth of the spiral bevel gear High-precision finishing is achieved by grinding in contact with the tooth surface.

JP 2013-212577 A

However, in the above-mentioned finishing by tooth grinding, grinding is performed while the tooth flanks of the spiral bevel gear and the cup-shaped grinding wheel are in contact with each other, and the contact arc length is long and the contact pressure is relatively high. There is a problem that heat generation is large, and grinding burn and grinding cracks are likely to occur.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and provides a ground body for spiral bevel gears and a spiral bevel gear capable of polishing tooth flanks with high accuracy without causing grinding burn or grinding cracks. It is an object of the present invention to provide a polishing method for

The characteristic structure of the ground body for spiral bevel gears according to the present invention for solving the above problems is as follows:
A spiral bevel gear polishing body for polishing a tooth surface of a spiral bevel gear,
It is provided with an annular or substantially annular polishing portion that is slidable along the tooth surface while being in contact with the tooth surface and deforms so as to follow the shape of the tooth surface.

According to the grounding body for spiral bevel gears of this configuration, when the grinding part slides along the tooth flank while being in contact with the tooth flank of the spiral bevel gear, the grinding part follows the shape of the tooth flank. As it deforms, the contact pressure of the polished part against the tooth surface is distributed over the entire tooth surface, suppressing the increase in contact pressure, so the heat generation is suppressed, and the tooth surface is highly precise without the occurrence of polishing burns or cracks. can be polished to

In the ground body for spiral bevel gears according to the present invention,
The polishing portion is preferably formed by arranging a plurality of flexible polishing elements.

According to the grounding body for spiral bevel gears of this configuration, when the grinding portion is pressed against the tooth flank of the spiral bevel gear, the grinding element bends along the shape of the tooth flank, and the ground portion fits snugly onto the tooth flank. can be contacted. Therefore, the tooth flank can be uniformly polished without locally polishing the tooth flank, and the tooth flank can be polished with higher precision. In addition, since it is not necessary to form the polished portion with high accuracy in accordance with the shape of the tooth surface, it can be easily manufactured. Furthermore, since the restoring force of the flexed abrasive element to return to its original state always presses the abrasive element against the tooth surface, even if the abrasive element itself wears out as the use progresses, the abrasive element remains in the tooth surface. can be maintained in contact with the surface, eliminating the need for special shaping operations such as dressing that are required with conventional cup-shaped grinding wheels.

In the ground body for spiral bevel gears according to the present invention,
The polishing element has an inner edge portion arranged on the inner peripheral side of the polishing portion and an outer edge portion arranged on the outer peripheral side of the polishing portion. are disposed at an angle to the rotational direction of the polishing section so that one of them is disposed at a position leading in the rotational direction of the polishing section and the other is disposed at a position following the rotational direction of the polishing section.

According to the grinding body for spiral bevel gears of this configuration, the grinding elements slide along the tooth flanks of the spiral bevel gear while making contact with the tooth flanks of the spiral bevel gears at a predetermined angle of inclination. flexes more smoothly along the contours of the tooth flank, allowing the abrasive element to more closely contact the tooth flank.

In the ground body for spiral bevel gears according to the present invention,
A spacer is preferably interposed between the adjacent polishing elements.

According to the spiral bevel gear grinding body of this configuration, the degree of bending of the grinding elements can be easily adjusted by adjusting the thickness, width, number, etc. of the spacers.

In the ground body for spiral bevel gears according to the present invention,
The polishing section has a substantially annular shape, and after the polishing section polishes the tooth flank of one tooth of the spiral bevel gear, the polishing section polishes the tooth flank of another tooth of the spiral bevel gear. It is preferable to provide a tooth feeder for feeding the teeth of the spiral bevel gear so as to transition to a grinding operation.

According to the spiral bevel gear polishing body of this configuration, the tooth flank of one tooth and the tooth flank of the other tooth of the spiral bevel gear are polished by the feeding action of the tooth feeding section for the teeth of the spiral bevel gear. Since it is continuously performed, after polishing one tooth, the polishing portion is once separated from the tooth surface of the one tooth, then the polishing portion is positioned with respect to the tooth surface of the other tooth, and then the other tooth is polished. Since there is no need to perform an extra operation such as bringing the polishing portion into contact with the tooth surface, the polishing operation can be performed efficiently.

Next, the characteristic configuration of the spiral bevel gear grinding method according to the present invention is as follows:
A method for polishing a spiral bevel gear using the above-described polishing body for a spiral bevel gear, comprising:
The inner edge portion or the outer edge portion of the grinding element at a position following in the rotational direction of the grinding portion is pressed against the tooth flank for grinding.

According to the spiral bevel gear grinding method of this configuration, the inner edge or outer edge of the grinding element faces the tooth surface in the direction opposite to the direction in which the teeth of the spiral bevel gear bite into between the adjacent grinding elements. Due to the relative movement, it is possible to reliably prevent teeth from digging in between adjacent sharpening elements during the sharpening operation.

FIG. 1 is a plan view of a gear polishing machine for polishing a spiral bevel gear using a spiral bevel gear polishing body according to a first embodiment of the present invention. FIG. 2 is a diagram showing a state in which a spiral bevel gear is ground using the spiral bevel gear grinding body according to the first embodiment of the present invention. FIG. 3 is an explanatory view (1) of the shape of the polishing portion of the spiral bevel gear polishing body according to the first embodiment of the present invention. FIG. 4 is a shape explanatory diagram (2) of the polishing portion of the spiral bevel gear polishing body according to the first embodiment of the present invention. FIG. 5 is a partially cutaway view of a base plate showing a state of polishing a spiral bevel gear using the spiral bevel gear polishing body according to the first embodiment of the present invention. FIG. 6 shows the polishing operation of the spiral bevel gear polishing body according to the first embodiment of the present invention, (a) is a state diagram before the polishing operation, and (b) is a state diagram during polishing of the concave tooth surface. is. FIG. 7 shows the polishing operation of the spiral bevel gear polishing body according to the first embodiment of the present invention, (a) is a state diagram before the polishing operation, and (b) is a state diagram during polishing of the convex tooth surface. is. FIG. 8 shows a polishing element, where (a) is a plan view and (b) is a front view. FIG. 9 is a vertical cross-sectional view showing a mounting state of grinding elements to the base plate of the spiral bevel gear grinding body according to the first embodiment of the present invention. FIG. 10 shows the polishing operation of the spiral bevel gear polishing body according to the second embodiment of the present invention, in which (a) is a state diagram before the polishing operation, and (b) is a state diagram during polishing of the concave tooth surface. is. FIG. 11 shows the polishing operation of the spiral bevel gear polishing body according to the second embodiment of the present invention, in which (a) is a state diagram before the polishing operation, and (b) is a state diagram during polishing of the convex tooth surface. is. FIG. 12 shows a spiral bevel gear grinding body according to a third embodiment of the present invention, in which (a) is a state diagram before tooth feeding and (b) is a state diagram after tooth feeding.

The present invention will be described below with reference to the drawings. However, the present invention is not intended to be limited to the embodiments described below or the configurations described in the drawings.

[First embodiment]
<Overall configuration of the polishing machine>
_A gear polishing machine ₁ shown in _FIG . A gear rotation feeder 5 is provided for rotating and feeding the shaft ₄ around its rotation axis S2. The position and attitude of each of the rotating shafts 2 and 4 on the three-dimensional coordinates are adjusted as necessary by a position/attitude adjusting mechanism that appropriately combines a slider mechanism, a tilt mechanism, a swiveling mechanism, and the like (not shown). be.

A spiral bevel gear grinding body 10A, which will be described in detail later, is attached to the grinding body rotating shaft 2 via a fastening means (not shown) in a state where the axis is aligned with the grinding body rotating shaft 2 . On the other hand, a spiral bevel gear 6 is attached to the gear rotating shaft 4 via fastening means (not shown) in a state where the gear rotating shaft 4 is aligned with the shaft center.

Here, as shown in FIGS. 1 and 2, the spiral bevel gear 6 is a type of bevel gear formed by carving required teeth 8 on a conical surface formed on a gear body 7 . Each tooth 8 has a curved (arc) tip, and has a convex arc-shaped tooth surface 8a (hereinafter referred to as a "convex tooth surface 8a") and a concave arc-shaped recess. tooth flanks 8b (hereinafter referred to as "concave tooth flanks 8b").

Next, the configuration of the ground body 10A for spiral bevel gears will be described in detail below.

<Polished body for spiral bevel gear>
As shown in FIG. 1, the spiral bevel gear grinding body 10A has one plate surface in contact with a mounting flange 2a formed at the tip of the grinding body rotating shaft 2, and a fastening means (not shown) is attached to the grinding body 10A. and a polishing portion 12A fixed on the other plate surface of the base plate 11 by a fixing means such as an adhesive.

<Polishing part>
As shown in FIGS. ₁ and 3, the polishing section 12A has a polishing section central axis T1 concentric with the rotation axis S1 of the polishing body rotating shaft ₂ , and the polishing section central axis T1 and the base plate ₁₁ are aligned. The point at which the plate surface on the other side intersects is defined as a center point O, and it is formed in an annular shape (annular shape in this example) around this center point O. As shown in FIG. This grinding portion 12A enters between the teeth of the spiral bevel gear 6 in an inclined posture with respect to the spiral bevel gear 6, and contacts the convex tooth surface 8a or the concave tooth surface 8b while contacting the convex tooth surface 8a or the concave tooth surface 8b. is slidable along the In addition, "annular" means a shape that is continuous over the entire circumference.

[Shape of the inner periphery of the polished part]
As shown in _FIG . 3, the sharpening portion central axis T1 is inclined at _an angle to the central axis T2 of the tooth trace generating virtual cone 15 having the virtual conical surface 15a along the convex tooth surface 8a of the tooth 8. It is tilted by _γ1 . The inner peripheral edge of the ground portion 12A is shaped along the virtual conical surface 16a of the virtual ground portion-generating cone 16 having the common generatrix with the tooth trace-generating virtual cone 15, with the ground portion center axis T1 as _a reference. formed. Here, the angle formed between the center axis T2 and the _generatrix in the tooth trace generating virtual cone 15 is α1, and the angle formed between the _ground portion center axis T1 and the generatrix in the _ground portion generating virtual cone ₁₆ is β1. Then, there is a relationship of γ ₁ =β ₁ -α ₁ .

[Outer edge shape of polished part]
As shown in FIG. ₄ , the sharpening part central axis T1 is inclined at _an angle to the central axis T3 of the tooth trace creating virtual cone 17 having the virtual conical surface 17a along the concave tooth surface 8b of the tooth 8. It is tilted by _γ2 . The outer peripheral edge of the ground portion 12A is shaped along the virtual conical surface 18a of the virtual cone 18 for creating the tooth trace, which has _a common generatrix with the virtual cone 17 for creating tooth trace, with reference to the center axis T1 of the grinding portion. formed. Here, the angle formed between the central axis T3 and the generatrix in the tooth trace generating virtual cone 17 is α2 _, and the angle formed between the grinding portion central axis _T1 and the _generatrix in the grinding portion generating virtual cone 18 is _β2 . Then, there is a relationship of γ ₂ =β ₂ -α ₂ .

As shown in FIG. 5, the polishing section 12A has a plurality of flexible polishing elements 20 placed between two virtual circles 16 and 17 concentric with the center point O and having different diameters. It is formed by arranging 16 and 17 along the circumferential direction.

<Polishing element>
As shown in FIGS. 8A, 8B, and 9, the polishing element 20 has an inverted trapezoidal shape when viewed from the front and has a predetermined plate thickness so that it can be inserted between the teeth of the spiral bevel gear 6. A substrate 21 is provided, and a polishing layer 22 is provided on an inner edge portion 20a (left side in FIG. 8(b)) of one side plate surface (lower plate surface in FIG. 8(a)) of the substrate 21. A polishing layer 22 is provided on the outer edge portion 20b (on the right side in FIG. 8B) of the other side plate surface of 21 (on the upper side in FIG. 8A). Here, the abrasive layer 22 is formed by attaching an abrasive to the base material 21 via an adhesive layer.

The polishing element 20 is fixed onto the base plate 11 by a fixing means such as an adhesive only at the central portion in the width direction between the inner edge 20a and the outer edge 20b, and the inner edge 20a and the outer edge 20b are freely attached. When pressed against the convex tooth surface 8a and the concave tooth surface 8b, it bends according to the pressing force and comes into close contact with the convex tooth surface 8a and the concave tooth surface 8b. Therefore, it is not necessary to form the ground portion 12A with high accuracy in accordance with the shape of the tooth surface, and the ground body 10A for spiral bevel gear can be easily manufactured.

As shown in FIG. 6A, the polishing element 20 has the inner edge 20a and the outer edge 20b at a position where the inner edge 20a precedes in the rotational direction _R1 of the polishing section 12A. are arranged at an angle to the rotation direction _R1 of the polishing section 12A so that the outer edges 20b are arranged in the following positions, respectively, and in the case shown in FIG. The inner edge portion 20a is disposed at an angle to the rotational direction _R2 of the polishing portion 12A so that the inner edge portion 20a is disposed at a position preceding the _R2 and a position following the R2.

In the polishing element 20, the substrate 21 can be appropriately selected from among flexible sheet materials, such as cotton cloth, glass cloth, synthetic fiber cloth, kraft paper, non-woven fabric, metal mesh, and synthetic resin sheet. be done. As the abrasive (abrasive grains) adhered to the base material 21, for example, at least one selected from diamond, CBN (cubic boron nitride), _B4 , C, _{Al2O3 , SiO2} , SiC, etc. One consisting of 1 or more types is mentioned. The adhesive layer for adhering the abrasives to the base material 21 is composed of a binder for bonding the abrasives together and an adhesive for bonding the abrasives to the base material. The binding agent for bonding the abrasives together is appropriately selected from, for example, commonly used metals, electrodeposits, vitrified materials, resins, and the like. Glue, synthetic resin, or the like, for example, is used as the adhesive for adhering the abrasive to the substrate. Main synthetic resins used include, for example, polyimide resins, phenol resins, and epoxy resins.

<Grinding operation>
The operation of grinding the spiral bevel gear 6 by the gear grinding machine 1 using the spiral bevel gear grinding body 10A constructed as described above will be described below.

First, as shown in FIG. 1, the rotation axis S1 of the grinding body rotation shaft ₂ and the rotation axis S2 of the gear rotation shaft ₄ intersect at a predetermined angle on a virtual projection plane. 5, the position/attitude adjustment mechanism (not shown) is installed so that the grinding part 12A enters between the teeth of the spiral bevel gear 6, as shown in FIG. to adjust the position and attitude of each of the rotation axes 2 and 4 on the three-dimensional coordinates.

[Grinding operation of concave tooth surface]
By rotating the grinding body rotating shaft ₂ , while rotating the spiral bevel gear grinding body 10A in the direction indicated by the symbol R in FIG. The spiral bevel gear 6 is rotated by a minute rotation angle by rotating the gear rotating shaft 4 so as to press the concave tooth surface 8b against the peripheral edge. As a result, the outer edge portion 20b of the polishing element 20 at a position trailing in the rotational direction _R1 of the polishing portion 12A is pressed against the concave tooth surface 8b, and the outer edge portion 20b of the polishing element 20 is pushed along the shape of the concave tooth surface 8b. Edge 20b is deflected to allow abrasive layer 22 (see FIGS. 8(a) and (b)) of abrasive element 20 to come into close contact with concave tooth flank 8b. Therefore, the concave tooth surface 8b can be uniformly polished without locally polishing the concave tooth surface 8b, and the concave tooth surface 8b can be polished with higher precision.

[Convex Tooth Surface Grinding Operation]
By rotating the grinding body rotary shaft 2, the grinding body 10A for spiral bevel gears is rotated in _two directions indicated by the symbol R in FIG. 7(a). The spiral bevel gear 6 is rotated by a minute rotation angle by rotating the gear rotation shaft 4 so as to press the convex tooth surface 8a against the peripheral edge. As a result, the inner edge portion 20a of the polishing element 20 at a position trailing in the rotational direction _R2 of the polishing portion 12A is pressed against the convex tooth surface 8a, and the inner edge portion 20a of the polishing element 20 is pushed along the shape of the convex tooth surface 8a. Edge 20a is deflected to allow abrasive layer 22 (see FIGS. 8(a) and (b)) of abrasive element 20 to closely contact convex tooth flank 8a. Therefore, the convex tooth surface 8a can be uniformly polished without polishing the convex tooth surface 8a locally, and the convex tooth surface 8a can be polished with higher precision.

In the above-described concave tooth surface polishing operation and convex tooth surface polishing operation, the inner edge 20a or the inner edge 20a of the polishing element 20 or As the outer edges 20b are moved relative to the teeth 8, the side edges of the polishing elements 20 flex during such relative movement to bring the side edges of adjacent polishing elements 20 closer together. Since the surfaces 8a and 8b are ground, it is possible to reliably prevent the teeth 8 from biting into between the adjacent grinding elements 20 during the grinding operation. 10B).

The concave tooth surface polishing operation and the convex tooth surface polishing operation are regarded as one set of polishing operations, and when this one set of polishing operations is completed, the polished portion 12A is pulled out from between the teeth of the spiral bevel gear 6 (not shown). The position/attitude adjustment mechanism adjusts the position and attitude of each of the rotating shafts 2 and 4 on the three-dimensional coordinates. After that, the spiral bevel gear 6 is rotated by a rotation angle corresponding to one tooth rotation feed by the rotation feed of the gear rotating shaft 4, and the tooth 8 to be polished next in the spiral bevel gear 6 and the adjacent tooth 8 are rotated. A position/posture (not shown) in which the ground body 10A for spiral bevel gear is inclined by a predetermined angle with respect to the spiral bevel gear 6 as shown in FIG. The adjustment mechanism adjusts the position and attitude of each of the rotation axes 2 and 4 on the three-dimensional coordinates. Then, the concave tooth surface polishing operation and the convex tooth surface polishing operation described above are performed as one set of polishing operation. Thereafter, these operations are repeated to polish the convex tooth flanks 8a and concave tooth flanks 8b of all the teeth 8 of the spiral bevel gear 6. FIG.

The concave tooth surface polishing operation and the convex tooth surface polishing operation are treated as one set of polishing operations, and in addition to the method of repeating this operation, the following method may be adopted. That is, the above concave tooth surface polishing operation (or convex tooth surface polishing operation) is regarded as one set of polishing operation, and after this one set of polishing operation is completed, the polished portion 12A is pulled out from between the teeth of the spiral bevel gear 6. A position/posture adjustment mechanism (not shown) adjusts the position and posture of each of the rotating shafts 2 and 4 on the three-dimensional coordinates. After that, the spiral bevel gear 6 is rotated by a rotation angle corresponding to one tooth rotation feed by the rotation feed of the gear rotating shaft 4, and the tooth 8 to be polished next in the spiral bevel gear 6 and the adjacent tooth 8 are rotated. A position/posture (not shown) in which the ground body 10A for spiral bevel gear is inclined by a predetermined angle with respect to the spiral bevel gear 6 as shown in FIG. The adjustment mechanism adjusts the position and attitude of each of the rotation axes 2 and 4 on the three-dimensional coordinates. Then, the above concave tooth surface polishing operation (or convex tooth surface polishing operation) is performed as one set of polishing operation. Thereafter, these operations are repeated to polish the concave tooth flanks 8b (or convex tooth flanks 8a) of all the teeth 8 of the spiral bevel gear 6. FIG. Subsequently, in a similar manner, the convex tooth flanks 8a (or concave tooth flanks 8b) of all the teeth 8 of the spiral bevel gear 6 are ground, and the tooth flanks 8a, 8b of all the teeth 8 of the spiral bevel gear 6 are polished. Polish 8b.

Even if the polishing element 20 itself wears due to the repetition of the above-described polishing operation over a long period of time, the restoring force that causes the polishing element 20 in a bent state to return to its original state keeps the tooth surface of the polishing element 20 constantly. Since it is pressed against 8a and 8b, even if the polishing element 20 wears as it is used, the polishing element 20 can maintain contact with the tooth flanks 8a and 8b. No special shaping work such as required dressing is required.

[Second embodiment]
FIG. 10 shows the polishing operation of the spiral bevel gear polishing body according to the second embodiment of the present invention. b) are shown respectively. 11A and 11B show the polishing operation of the spiral bevel gear polishing body according to the second embodiment of the present invention. Figure (b) is shown respectively. In addition, in the spiral bevel gear grinding body 10B of the second embodiment, the same or similar parts as those of the spiral bevel gear grinding body 10A of the first embodiment are denoted by the same reference numerals in the figure, and the details thereof are as follows. In the following, the description will focus on the parts unique to the ground body 10B for spiral bevel gears of the second embodiment (for spiral bevel gears of the third embodiment described later). The same applies to the polishing body 10C).

As shown in FIG. 10(a), in the spiral bevel gear grinding body 10B of the second embodiment, the grinding section 12B includes a plurality of grinding elements 20 and a plurality of spacers 25 formed into virtual circles 16, 17 ( (see FIG. 5).

Each of the plurality of spacers 25 has an inner edge portion 25a arranged on the inner peripheral side of the polishing portion 12B and an outer edge portion 20b arranged on the outer peripheral side of the polishing portion 12B. It is composed of a plate-like member having a size and a shape capable of supporting from the rear side in the rotational direction of the spiral bevel gear grinding body 10B up to the vicinity of the edge where the 22 is provided.

As shown in FIG. 10A, the outer edge 25b of the spacer 25 is located at a position where the inner edge 25a precedes the polishing portion 12B in the rotational direction _R1 of the polishing portion 12B. In the case shown in FIG. 11(a), the outer edge 25b is arranged at a position leading in the rotational direction _R2 of the polishing portion 12B, and the inner edge 25a is arranged at a position following. are inclined with respect to the rotation directions R ₁ and R ₂ of the polishing section 12B. Between the virtual circles 16 and 17 (see FIG. 5), the spacers 25 are arranged along the circumferential direction of the virtual circles 16 and 17 so that the plate surfaces of the adjacent polishing elements 20 face each other. is set.

<Grinding operation>
The grinding operation of the spiral bevel gear 6 using the spiral bevel gear grinding body 10B constructed as described above will be described below.

First, in the same manner as the polishing operation of the spiral bevel gear 6 using the spiral bevel gear polishing body 10A described above, the spiral bevel gear polishing body 10B is tilted by a predetermined angle with respect to the spiral bevel gear 6. A position/posture adjustment mechanism (not shown) adjusts the positions and postures of the rotary shafts 2 and 4 on the three-dimensional coordinates so that the ground portion 12B enters between the teeth of the spiral bevel gear 6 .

[Grinding operation of concave tooth surface]
By rotating the grinding body rotating shaft ₂ , while rotating the spiral bevel gear grinding body 10B in the direction indicated by the symbol R in FIG. The spiral bevel gear 6 is rotated by a minute rotation angle by rotating the gear rotating shaft 4 so as to press the concave tooth surface 8b against the peripheral edge. As a result, the outer edge portion 20b of the polishing element 20 at a position trailing in the rotational direction _R1 of the polishing portion 12B is pressed against the concave tooth surface 8b, and the outer edge portion 20b of the polishing element 20 is pushed along the shape of the concave tooth surface 8b. Edge 20b is deflected to allow abrasive layer 22 (see FIGS. 8(a) and (b)) of abrasive element 20 to come into close contact with concave tooth surface 8b. At this time, the polishing elements 20 are supported by the spacers 25 .

[Convex Tooth Surface Grinding Operation]
By rotating the grinding body rotating shaft 2, while rotating the spiral bevel gear grinding body 10B in _two directions indicated by symbol R in FIG. The spiral bevel gear 6 is rotated by a minute rotation angle by rotating the gear rotation shaft 4 so as to press the convex tooth surface 8a against the peripheral edge. As a result, the inner edge portion 20a of the polishing element 20 at a position trailing in the rotational direction _R2 of the polishing portion 12B is pressed against the convex tooth surface 8a, and the inner edge portion 20a of the polishing element 20 is pushed along the shape of the convex tooth surface 8a. Edge 20a is deflected to allow abrasive layer 22 (see FIGS. 8(a) and (b)) of abrasive element 20 to closely contact convex tooth flank 8a. At this time, the polishing elements 20 are supported by the spacers 25 .

According to the grinding body 10B for bevel gears of the second embodiment, the degree of deflection of the grinding elements 20 can be easily adjusted by adjusting the thickness, width, number, etc. of the spacers 25 .

[Third embodiment]
FIG. 12 is a view showing a ground body for spiral bevel gears according to a third embodiment of the present invention, showing a state diagram (a) before tooth feeding and a state diagram (b) after tooth feeding, respectively. there is

As shown in FIGS. 12(a) and 12(b), in the spiral bevel gear grinding body 10C of the third embodiment, the grinding portion 12C is adhered to the other side of the base plate 11 with an adhesive or the like. It is configured to be fixed by means.

Like the polishing sections 12A and 12B, the polishing section 12C has _a polishing section central axis T1 concentric with the rotation axis S1 of the polishing body rotating shaft ₂ , and has a substantially annular shape (in this example, It is formed in a substantially annular shape, and is constructed by arranging a plurality of flexible polishing elements 20 in the same manner as the polishing portions 12A and 12B. Each polishing element 20 is arranged such that one of the inner edge portion 20a and the outer edge portion 20b is disposed at a position leading in the rotational direction of the polishing portion 12C and the other is disposed at a position following the rotation of the polishing portion 12C. It is slanted with respect to the direction. Spacers 25 are interposed between adjacent polishing elements 20 as necessary. In addition, "substantially annular" means a shape that is discontinuous in a part of one circumference.

The ground portion 12C is formed with an opening 30 having a width slightly larger than the radial width of the outer and inner circumferences of the spiral bevel gear 6 . A tip portion of the polishing portion 12C located on one side of the opening portion 30 is tapered. The base end of the grinding portion 12C located on the other side of the opening 30 and a portion from the base end to a predetermined position a predetermined distance along the circumferential direction of the grinding portion 12C serve as a tooth feed portion 31 .

<Tooth feeding part>
The tooth feeding portion 31 is curved so as to increase the degree of inward inclination of the ground portion 12C as it advances toward the base end side of the ground portion 12C. It extends to a position shifted inward of the polishing portion 12C by the distance between the teeth. Since the radius of curvature of each of the inner peripheral side and the outer peripheral side of the tooth feeding portion 31 is slightly smaller than the radius of curvature of each of the convex tooth surface 8a and the concave tooth surface 8b, the ground portion 12C between the teeth of the spiral bevel gear 6 When the grinding portion 12C is rotated once in a state in which the tooth feed portion 31 passes between the teeth of the spiral bevel gear 6, it is conceivable that the resistance becomes excessive. Since the inner edge portion 20a and the outer edge portion 20b of the polishing element 20 respectively bend, the tooth feeding portion 31 can pass between the teeth of the spiral bevel gear 6 without excessive resistance to passage.

The grinding operation of the spiral bevel gear grinding body 10C configured as described above is basically the same as that of the toothed bevel gear grinding bodies 10A and 10B. In the following, tooth feeding by the tooth feeding portion 31 of the grinding body 10C for bevel gear will be described.

As shown in FIGS. 12A and 12B, following the grinding operation of one tooth 8 of the spiral bevel gear 6 by the grinding section 12C, the tooth feeding section 31 moves between the teeth of the spiral bevel gear 6. 12(b), a force that rotates the spiral bevel gear ₆ in the direction of arrow R3 in FIG. When the tooth feeding portion 31 passes between the teeth of the spiral bevel gear ₆ as shown in FIG. It advances toward between the teeth of the spiral bevel gear 6 that has been set.

According to the toothed bevel gear grinding body 10C of the third embodiment, the tooth flanks 8a and 8b of one tooth 8 of the spiral bevel gear 6 and the tooth flanks 8a and 8b of the tooth 8 of the spiral bevel gear 6 are fed by the tooth feeding portion 31. Since the tooth flanks 8a and 8b of the other tooth 8 are continuously polished, after the tooth flanks 8a and 8b of the one tooth 8 are polished, the tooth flanks 8a and 8b of the one tooth 8 are first polished. After releasing the portion 12C and then positioning the abrasive portion 12C against the tooth flanks 8a, 8b of the other tooth 8, an extra action is taken to bring the abrasive portion 12C into contact with the tooth flanks 8a, 8b of the other tooth 8. It is possible to eliminate the need for it and perform the polishing operation efficiently.

As described above, the polishing body for spiral bevel gears and the method for polishing spiral bevel gears of the present invention have been described based on a plurality of embodiments, but the present invention is not limited to the configurations described in the above embodiments. Instead, the configuration can be changed as appropriate without departing from the gist of the invention, such as combining the configurations described in each embodiment as appropriate.

For example, in the above-described embodiment, the polishing element 20 provided with the polishing layer 22 on the surface of the substrate 21 was used, but the present invention is not limited to this. may be kneaded and formed into a sheet.

The polished body for spiral bevel gears and the method for polishing spiral bevel gears of the present invention have the characteristic that the tooth flanks can be polished with high precision without causing burn marks or cracks during polishing. , can be used for grinding spiral bevel gears.

1 Gear grinding machine 6 Spiral bevel gear 8 Tooth 8a Convex tooth surface 8b Concave tooth surface 10A to 10C Polishing body for spiral bevel gear 12A to 12C Polishing part 15, 17 Tooth trace creation virtual cone 16, 18 Polishing part creation virtual Cone 15a, 17a Virtual conical surface 16a, 18a Virtual conical surface 20 Polishing element 20a Inner edge 20b Outer edge 25 Spacer 30 Opening 31 Tooth feed

Claims (4)

A spiral bevel gear polishing body for polishing a tooth surface of a spiral bevel gear,
an annular or substantially annular polishing portion that is slidable along the tooth surface while being in contact with the tooth surface and deforms so as to follow the shape of the tooth surface ;
The polishing section is formed by arranging a plurality of flexible polishing elements,
The polishing element has an inner edge portion arranged on the inner peripheral side of the polishing portion and an outer edge portion arranged on the outer peripheral side of the polishing portion. and one of the grinding bodies for a spiral bevel gear is disposed at a position leading in the rotation direction of the grinding section and the other at a position trailing in the rotation direction of the grinding section . 2. The grinding body for spiral bevel gears according to claim 1 , wherein a spacer is interposed between said adjacent grinding elements. A spiral bevel gear polishing body for polishing a tooth surface of a spiral bevel gear,
an annular or substantially annular polishing portion that is slidable along the tooth surface while being in contact with the tooth surface and deforms so as to follow the shape of the tooth surface;
The polishing section has a substantially annular shape, and after the polishing section polishes the tooth flank of one tooth of the spiral bevel gear, the polishing section polishes the tooth flank of another tooth of the spiral bevel gear. A grinding body for spiral bevel gears, comprising a tooth feeder for feeding teeth of the spiral bevel gear so as to transition to a grinding operation. A method for polishing a spiral bevel gear using the polishing body for a spiral bevel gear according to claim 1 or 2 , comprising:
A method of grinding a spiral bevel gear, wherein the inner edge or the outer edge of the grinding element at a position following the grinding portion in the rotational direction is pressed against the tooth surface for grinding.

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