A wheel support bearing assembly, which enables an increase in the strength and the fatigue strength of its wheel mounting flange or vehicle body fitting flange against high stress and repeated stress and the suppression of the increase of the number of processes, includes an inner member and an outer member rotatable relative to each other through rolling elements. The flange is formed on the inner member or the outer member, for example, a hub. A component part having the flange is a hot-forged product of steel in which a matrix portion is formed as a standard structure and the non-standard structural portion is formed on the surface of the flange. The non-standard structure is formed of either of a fine ferrite/pearlite structure, an upper bainite structure, a lower bainite structure, and a tempered martensite structure, or mixture of two or more of these structures.

Bearing device for wheel

According to one embodiment, a heat source unit apparatus includes air heat exchangers, each includes a plurality of fins arranged at prescribed intervals, heat exchanging pipes penetrating the fins, and bent strips extending at sides and bent in the same direction, and a heat exchange module includes two air heat exchangers, each having the bent strips opposed to those of the other air heat exchanger, the air heat exchangers being inclined such that lower edges are close to each other and upper edges are spaced apart, whereby the heat exchange module is shaped like a letter V as seen from side.

Heat source unit

A bearing device for a wheel prevents backlash in a circumferential direction and has excellent workability for connecting a hub wheel and an outer joint member of a constant velocity universal joint. The bearing device includes a recess-projection fitting structure in which the hub wheel and a shaft section, which is fitted in a hole of the hub wheel of the outer joint member of the constant velocity universal joint, are unitized together. In the recess-projection fitting structure, entire fitting regions among projections on the outer surface of the shaft section of the outer joint member and recesses, which fit on the projections, are brought into intimate contact with each other.

Bearing device for a wheel

PROBLEM TO BE SOLVED: To provide a worm form-rolling device which can suppress faults caused by a phenomenon that a workpiece moves to the axial direction during form-rolling while achieving its simplification, and to provide a worm form-rolling method SOLUTION: Each outer circumferential part of each roll die 23 is provided with: a recessed part 40; a biting tooth 41; a forming tooth 42; and a finishing tooth 43, and a worm is formed at a workpiece in the range at which each roll die 23 rotates for one time One edge side in the axial direction of the outer circumferential part in each roll die 23 is provided with a chamfer part 50 allowing the forming tooth 42 or a relief tooth 44 to follow the worm in accordance with the movement of the workpiece to the axial direction upon the forming of the worm Thus, faults caused by a phenomenon that a workpiece moves to the axial direction during form-rolling can be suppressed without drive-controlling each die by a controller though it has been performed heretofore, and the simplification of the form-rolling device can be achieved COPYRIGHT: (C)2010,JPO&INPIT

Worm form-rolling device and worm form-rolling method

The invention relates to a hard broaching finish machining process for a surface of an internal keyway. The internal keyway of a part is sleeved at one end of a cutter which is same with the internal keyway in shape to fix both ends of the cutter so that the part moves along the cutter axially at a speed of 4-10m/s. During movement, deviation of the center of the internal keyway in the part and the axis of the cutter is maintained smaller than or equal to 0.01mm. The cutter is of a sectionally differential stepped structure. The blade hardness is greater than or equal to HRC67. The invention further provides a hard broaching finish machining device for the surface of the internal keyway. Both ends of the cutter are respectively fixed on an upper tool apron and a lower tool apron which are located above and below a work table and installed coaxially. A work table drive device drives the work table to move along a guide rail on a machine tool body to realize high speed machining of an internal spline of a workpiece to be machined. The hard broaching finish machining process for the surface of the internal keyway and the device provided by the invention are simple in process method and reasonable in structure of the device, and has high machining precision and efficiency for internal keyways, and low cost and energy consumption, and industrialized production can be realized in a large scale.

Hard broaching finish machining process for surface of internal keyway and device

A broach has a main body of a cemented carbide material. On this main body, a front grip portion, a cylindrical portion following the front grip portion and provided with a plurality of guide parts in its outer periphery, a broach cutting edge portion following an end of the cylindrical portion and having a number of cutting edges, and a cylindrical extension following the broach cutting edge portion and having a maximum outer periphery dimension to such an extent that the extension does not interfere with a work are integrally provided. On an end surface of the cylindrical extension, a load receiving shoulder is formed, which leads to a rear grip portion including a small-diameter part and is orthogonal to or inclined with respect to a broach axis. The load receiving shoulder has a sufficient area to bear a cutting load. A broaching machine grips the rear grip portion with its load receiving surface abutting against the load receiving shoulder of the cemented carbide broach. The broach, even when having a small diameter, does not suffer from an insufficient tensile strength of the front grip portion.

Cemented carbide broach and broaching machine

PROBLEM TO BE SOLVED: To provide a gear shaft having a spline and a gear which can be easily assembled in assembly work, and a flat die for form-rolling the gear shaft. SOLUTION: An extension part 15 which extends in the axial direction from a tooth bottom end 15a and has a larger diameter than that of a shaft part is provided. The tooth flank comprises: a tapered surface 21 having a substantially trapezoidal shape which is tapered downwardly in the axial direction from an end part 21c of a tooth crest 13; a first tooth flank surface 22 which is adjacent to one oblique line 21a of the tapered surface, a tooth flank end part 22a on the same side as the oblique line and an extension part, and extends along the oblique line; a second tooth flank surface 23 disposed symmetrically to the first tooth flank surface across the tooth crest; and a tooth flank end chamfered surface 24 which is adjacent to the first and second tooth flank chamfered surface to form an oblique surface to connect the extension part with an upper side 21d of the tapered surface, and each surface is curved. The flat die for form rolling the gear shaft includes those for the outer circumference and for chamfering. A tooth space 41 for chamfering has the same tooth profile as that for a tooth space 31 for outer circumference, and is cut upwardly at an angle of α° in the diagonal direction. COPYRIGHT: (C)2003,JPO

Gear shaft, and flat die for form-rolling gear shaft

PROBLEM TO BE SOLVED: To provide a broaching method and a composite internal broaching tool at a low cost, including a cutting blade having a flank without a straight land used in finishing a high-hardness material having a hardness of 45 to 65 HRC, and compensating dimensions of the cutting blade decreased by re-grinding the flank of the cutting blade. SOLUTION: In this broaching method, first blade groups 5, 6 and 7 having a cutting blade including final finishing size blades 15, 16 are planted in a plurality of grooves 2, 3 and 4 formed extending in the longitudinal direction in the circumference of a shaft 50 of a bar-like broaching tool body 1, and second blade groups 52, 53 and 54 having at least one or more final finishing size blades 20, 21 are provided in the rear of the first blade group after re-grinding, thereby broaching. This composite internal broaching tool 55 is used in the broaching method. COPYRIGHT: (C)2005,JPO&NCIPI

Broaching method and composite internal broaching tool

PROBLEM TO BE SOLVED: To provide a broach to be attachable, keeping the runout accuracy of the broach well, without causing looseness even if receiving large load by broaching. SOLUTION: The broach has: a front grip part 32 provided at a body 7; a cylindrical part 34 following the front grip part 32 and provided with a plurality of guide parts 33 at the outer periphery; a small diameter bar-like shaft part 37 extending from a cylindrical part end 11; at least one assembly 6 of hollow cylinder shape or ring shape provided with a large number of cutting edges 31 fitted to the small diameter bar-like shaft part 37; and a rear grip part 38 following the small diameter bar-like shaft part extension part 36 of the body 7. The small diameter bar-like shaft part extension part 36 is provided with an external screw part 39, and the end part of each of a large number of set bolts 9 provided at a right angle on the circumference of a nut 8 screwed with the external screw part 39 is pressed to a collar 12 to press the end part of each set bolt 9 to the plane of the assembly 6 through the collar 12. The assembly 6 of hollow cylinder shape or ring shape is thereby pressed with preload through the collar 12. COPYRIGHT: (C)2005,JPO&NCIPI

Builtup internal broach

PROBLEM TO BE SOLVED: To provide a flat die for form rolling of a worm shaft in which the bend by the form rolling is small, and any step for straightening is unnecessary even when the diameter of a cylindrical part forming a straightening die adjacent to a circumferential surface form rolling part of a columnar material is different from the rolling circular diameter corresponding to the lead angle of the flat die. SOLUTION: A boundary line 24 at an end of a die tooth flank forming part of an upper face 71 of a flat die 7 on the side opposite to the moving direction 13 by the form rolling of a worm shaft is a continuously changing boundary line 24 matched with the moving locus formed by an end 2 of a circumferential surface form rolling part of a work 12 by the form rolling when using dies 9, 11 for straightening. A chamfering flank face 23 is formed on the upper face 71 of the flat die 7 outside the boundary line 24. COPYRIGHT: (C)2008,JPO&INPIT

Murai Yasuhiro

Papers

Cemented carbide broach and broaching machine

Gear shaft, and flat die for form-rolling gear shaft

Broaching method and composite internal broaching tool

Builtup internal broach

Flat die for form rolling of worm shaft