JPH0666915U - Fall prevention mechanism in linear type turn broach - Google Patents

Abstract

(57) [Summary] [Object] To provide a fall prevention device that does not require an operator to support a broach when mounting or removing the broach on a holder, and can perform the broach attachment / detachment work with one hand. [Structure] A vertical groove portion 30 is formed on the side portion of the holder 2 so that the other side portion of the linear turn broach 4 is slidable in the vertical direction, and is inclined so as to gradually project toward the tip side from the upper side to the lower side. The claw member 32 having the inclined surface at the tip end is urged in the horizontal direction by the spring 50, and the vertical groove portion 3 is formed.
The vertical groove portion 30 is provided so as to be capable of protruding a predetermined amount inward from the side of 0.
In the side part of the linear turn brooch 4 that is inserted into
The upper wall surface 52a is formed at the same inclination angle as the inclined surface of the claw member 32, and the lateral groove portion 52 with which the tip end of the claw member 32 can engage.
Strength for canceling the gravitational force of the linear turn broach 4 acting on the upper wall surface 52a of the lateral groove 52 of the linear turn broach 4 engaged with the tip of the claw member 32 by forming the urging force of the spring 50. Set above.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a fall prevention mechanism for a linear turn broach used for fixing a linear turn broach used for machining a journal diameter of a crankshaft to a holder.

[0002]

[Prior art]

 7 to 9 show a conventional linear type turn broach mounting structure. In these drawings, reference numeral 2 is driven vertically (arrows (a) and (b)) by a broaching machine (not shown). The holder is a linear turn broach (hereinafter referred to as "broach"), which is integrally fixedly attached to the holder 2.

The broach 4 is formed in an elongated shape as a whole, and an adapter 10 to which a cutting blade tip 12 is fixed is fitted to a groove portion 14 formed in the one side portion 6 on one side portion 6. In addition to being fixed, a plurality of cutting edge chips 16 facing the side of the one side portion 6 are bolted.

Then, as shown in FIG. 9, with respect to the work W that is rotationally driven around the axis, the work W and the holder 2 are linearly driven in a direction orthogonal to the axial direction of the work W (downward in the vertical direction) and cut. By the blades 12 and 16, the side cut of the counterweight portion C, the width cutting of the journal portion J 1, and the diameter processing of the journal portion J 1 are continuously performed. The number, shape, arrangement, etc. of the cutting edge chips 12, 16 can be variously changed according to the processed shape of the work W.

A key groove 18 (FIG. 9) is formed in the center of the other side portion 8 of the broach 4 in the width direction, and a side surface extending linearly in the width direction is formed at one end thereof. An L-shaped engagement portion 20 is formed. Further, a plurality of (four in this case) dharma holes 22 are formed on both sides of the other side portion 8 and open toward the one side portion 6 side.

When the broach 4 is attached to the holder 2, the vertical key 24 attached to the holder 2 is fitted into the key groove 18, and each of the clamp bolts 28 attached to the holder 2 is attached. The large hole portion 22a of the dharma hole 22 is fitted.

Then, the broach 4 is slid in the longitudinal direction (arrow (a) direction), and the engaging portion 20 is moved to a position where it abuts on the key 26 mounted on the holder 2. In this state, the broach 4 is completely positioned with respect to the holder 2, and each clamp bolt 28 is moved into the small diameter portion 22b of the dulla hole 22. Then, all the clamp bolts 28 are tightened to complete the work of mounting the broach 4 on the holder 2.

[0008]

[Problems to be solved by the device]

 By the way, when the broach 4 is attached to the holder 2 as described above, after the engaging portion 20 of the broach 4 is brought into contact with the key 26, the broach 4 is not tightened until the clamp bolts 28 are completely tightened. Must be supported by the operator to prevent it from falling. The same applies when removing each clamp bolt 28. Therefore, it is necessary for the worker to use both hands for mounting and dismounting the broach 4, and it is difficult to work in places with poor workability such that sufficient working space cannot be secured. was there.

The present invention has been made in view of the above circumstances, and an operator does not need to support the brooch when mounting or removing the broach on the holder, and the broach attaching / detaching operation can be performed with one hand. The purpose is to obtain a fall prevention device that can do this.

[0010]

[Means for Solving the Problems]

 According to the present invention, the other side portion of the linear type turn broach, which is formed in an elongated shape and has a plurality of cutting edge chips attached to one side portion along the longitudinal direction, is linearly driven in the vertical direction. A fall prevention mechanism in a linear turn broach used for fixing to a side part of a holder, wherein the other side part of the linear turn broach is vertically arranged on the side part of the holder. A claw member, which has a slidable vertical groove portion and which has a slanted surface at the tip portion which gradually inclines toward the tip side as it goes downward from above, is biased horizontally by the biasing means. The linear turn broach, which is provided so as to project inward by a predetermined amount from the side of the vertical groove portion and is inserted into the vertical groove portion, has an upper wall surface that is the same as the inclined surface of the pawl member. The nail is formed with an inclination angle A lateral groove is formed so that the tip of the material can be engaged, and the biasing force of the biasing means acts on the upper wall surface of the lateral groove of the linear turn broach engaged with the tip of the claw member. The feature is that the linear turn broach is set to have a strength higher than that for canceling the gravity.

[0011]

【Example】

 Hereinafter, an embodiment of the present invention will be described with reference to FIGS. In the present embodiment, the same components as those of the conventional one shown in FIGS. 7 to 9 are designated by the same reference numerals and the description thereof will be omitted.

The fall prevention mechanism (hereinafter referred to as “fall prevention mechanism”) in the linear turn broach according to the present embodiment has a vertical groove portion 30 having a U-shaped cross section formed on a side portion of the holder 2 along the vertical direction. In addition, the main feature is that the other side portion 8 of the broach 4 is slidably fitted in the vertical groove portion 30 and the claw member 32 is provided on the side of the vertical groove portion 30 of the holder 2. . Further, in order to facilitate the work of fixing the broach 4 to the holder 2, a structure for fixing the broach 4 using an engaging member 34 and a pressing member 36 described later is adopted.

As shown in FIG. 4, the claw member 32 is a substantially prismatic member having a locking portion 32a on the rear end side, and the tip of the claw member 32 faces the inside of the vertical groove portion 30. 38, the inclined surface 32b is formed at the tip end portion so as to incline toward the tip end side from the upper side toward the lower side. The angle formed by the inclined surface 32b with respect to the horizontal plane is θ as shown in the figure. Further, as shown in FIG. 2, a part of the tip end portion of the claw member 32 is a notched portion on the work W side in plan view, and is formed as an inclined portion 32c.

The support case 38 is disposed laterally of the vertical groove portion 30 in a groove portion 40 that is formed in the horizontal direction by opening to the vertical groove portion 30, and is integrally attached to the holder 2 by the case fixing screws 42 and 42. It is fixed. A straight wall portion 44 is formed at one end of the support case 38 to support the tip end portion of the claw member 32 in a horizontally slidable manner. The straight wall portion 44 is connected to the rear end side of the straight wall portion 44 and is connected to the space portion 46. Are formed. Further, a hole portion 48 communicating with the space portion 46 is formed on the other end side of the support case 38, and a spring (corresponding to a biasing means) 50 mounted in the hole portion 48 has one end portion thereof formed in the space portion. The claw member 32 is urged toward the vertical groove portion 30 side by extending toward the 46 side.

As shown in FIGS. 1 and 2, a lateral groove portion 52 with which the tip end portion of the claw member 32 can be engaged is formed on the side portion of the portion of the broach 4 which is inserted into the vertical groove portion 30. The upper wall surface 52a of the groove 52 is formed at the same inclination angle as the inclined surface 32b of the claw member 32, and can be brought into contact with the inclined surface 32b without a gap.

Here, the gravity acting on the brooch 4 is Bw, and the urging force of the spring 50 on the claw member 32 in the horizontal direction is FS. Of the gravity BW acting on the upper wall surface 52a, the downward component along the upper wall surface 52a is expressed by BW × sin (θ), and the upward component along the upper wall surface 52a of the reaction force of the urging force FS is , FS × cos (θ).

Therefore, when FS = BW × tan (θ), the gravity acting on the broach 4 is balanced with the upward force of the bar 50. In the present embodiment, the strength of the spring 50 is set so as to satisfy FS ≧ BW × tan (θ).

Next, a fixing structure of the broach 4 using the engaging member 34 and the pressing member 36 will be described. The engaging member 34 is connected to the shaft portion 54, a small diameter portion 56 which is connected to the tip end side of the shaft portion 54 in a state where the axis line coincides with the shaft portion 54, and has a diameter smaller than the shaft portion 54, and the small diameter portion 56. A tip engaging portion 58 that is connected to the tip side of the small diameter portion 56 in a state where the axis is aligned with the small diameter portion 56 and has a diameter larger than the small diameter portion 56 and the same diameter as or smaller than the shaft portion 54; It is composed of a base end engaging portion 60 which is continuous with the end side and has a diameter larger than that of the shaft portion 54. Further, a stopper member 64 having a screw portion formed on an outer peripheral portion 64a is connected to the base end side of the engaging member 34 via a spring 62.

The pressing member 36 is composed of a threaded portion 68 and a disc-shaped engaging portion 70 which is continuous with the threaded portion 68 in an axially aligned state and has a larger diameter than the threaded portion 68. A wrench hole 68a is formed on the end surface of the screw portion 68.

On the other side portion 8 of the broach 4, an insertion hole portion 72 into which the tip end engagement portion 58 and the small diameter portion 56 of the engagement member 34 can be inserted, and an insertion hole portion 72 connected to the insertion hole portion 72 are provided. Slide engaging portion 76 having engaging wall portion 74 capable of locking movement of tip engaging portion 58 in the axial direction when broach 4 is moved in the longitudinal direction (vertically upward) with respect to 34. However, a plurality (two in this case) are formed along the longitudinal direction of the other side portion 6 (FIG. 3). That is, in the space portion connected to the insertion hole portion 72, the portion extending from the middle portion in the depth direction to the bottom surface of the insertion hole 72 extends in an elliptical shape, and the portion extending from the middle portion in the depth direction to the opening gradually contracts. It has a diameter and extends in a Dharma shape.

In addition, a slide groove 78 for making the sliding amount of the broach 4 with respect to the holder 2 more accurate is provided at an intermediate portion between the slide engaging portion 76 and the slide engaging portion 76. It is formed along the direction.

A support hole portion 80 is formed on a side portion of the holder 2 so as to open in a central portion of the vertical groove portion 30 and support the shaft portion 54 of the engaging member 34 so as to be capable of advancing and retracting in the depth direction of the vertical groove portion 30. However, a plurality (two in this case) are formed corresponding to the slide engaging portions 76 along the longitudinal direction of the vertical groove portion 30. Further, the base end side portion 82 of the support hole 80 is formed to have a large diameter so that the base end engaging portion 60 of the engaging member 34 can move in the axial direction, and the stopper member 64 is formed in the base end side portion. A threaded portion 84 is formed on which the outer peripheral portion 64a is screwed.

In the vicinity of the vertical groove portion 30 of the holder 2, there is formed a screw hole portion 86 which has an axis line parallel to the support hole portion 80 and is screwed into the screw portion 68 of the pressing member 36, and the screw hole portion 86 is formed. A space 88 is formed in continuation of the portion 86 so that the disc-shaped engaging portion 70 can move in the axial direction. As shown in FIG. 5, the axial distance between the support hole portion 80 and the screw hole portion 86 is determined by inserting the shaft portion 54 of the engaging member 34 into the support hole portion 80 and inserting the screw of the pressing member 36 into the screw hole portion 86. When the portion 68 is screwed, the base end engaging portion 60 and the disc-like engaging portion 70 are set to be engaged with each other.

A key groove 90 extending along the width direction is formed at an intermediate portion between the support hole portion 80 and the support hole portion 80 in the longitudinal direction of the holder 2 (FIG. 3), and the key 92 is provided in the key groove 90. It has been inserted.

Next, the operation of this embodiment will be described. When the broach 4 is attached to the holder 2, the operator fits the insertion hole portions 72 of the broach 4 into the distal end engaging portions 58 and the reduced diameter portions 56 of the engaging members 34, respectively. The other side portion 8 is inserted into the vertical groove portion 30 of the holder 2. At this time, the inclined portion 32c of the claw member 32 is pressed by the other side portion 8 of the holder 2 and retracts to the space portion 46 side, so that there is no obstacle when the holder 4 is inserted into the vertical groove portion 30. .

Next, the broach 4 is moved in its longitudinal direction (arrow (a) direction) to engage the tip engaging portion 58 with the engaging wall portion 74. At this time, the tip portion of the claw member 32 engages with the lateral groove portion 52, and the slide groove portion 78 abuts on the key 92, so that the positioning of the broach 4 with respect to the holder 2 becomes accurate. In this state, the broach 4 is completely supported by the claw member 32, and it is not necessary for the operator to support the broach 4 so as not to fall.

Then, when each pressing member 36 is tightened with a wrench through the wrench hole 68 a, the disc-shaped engaging portion 70 moves the proximal end engaging portion 60 of the engaging member 34 away from the vertical groove portion 30. By pressing, the broach 4 is brought into close contact with the vertical groove portion 30 without a gap and is completely fixed to the holder 2.

The broach 4 can be removed from the holder 2 by performing the work in the reverse order of the above-mentioned mounting work. Also in this case, since the broach 4 is supported by the claw members 32, it is not necessary for an operator to support the broach 4 when loosening the pressing members 36.

[0029]

[Effect of device]

 As described above, according to the fall prevention mechanism for the linear turn broach according to the present invention, the vertical groove portion is formed on the side portion of the holder so that the other side portion of the linear turn broach can slide vertically. In addition, the claw member that has an inclined surface at the tip that gradually inclines toward the tip side from the top to the bottom is urged in the horizontal direction by the urging means to inward from the side of the vertical groove. The linear turn broach, which is inserted into the vertical groove and is capable of protruding by a predetermined amount, has an upper wall surface formed at the same inclination angle as the inclined surface of the pawl member, and the tip of the pawl member is engaged. A lateral groove that can be fitted is formed, and the urging force of the urging means is due to the gravity of the linear turn broach that acts on the upper wall surface of the lateral groove of the linear turn broach engaged with the tip of the claw member. Set to more than strength Therefore, if the other side of the linear turn broach is inserted and positioned in the vertical groove, the linear turn broach can be supported by the holder by the claw member even if the operator does not support the linear turn broach. And will not fall. Therefore, the worker can perform the bolt tightening work for attaching / detaching the linear turn broach to / from the holder with one hand, and can easily attach / detach the linear turn broach even in a poor workability place. .

[Brief description of drawings]

FIG. 1 is a front view showing a fall prevention mechanism in a linear turn broach according to an embodiment of the present invention.

2 is a cross-sectional view of the fall prevention mechanism of FIG.

3 is a side view of the fall prevention mechanism of FIG. 1. FIG.

FIG. 4 is a partially enlarged view of FIG.

5 is a cross-sectional view of the fall prevention mechanism of FIG.

FIG. 6 is a diagram showing a positional relationship between an engaging member and a pressing member as viewed from the back side of the holder.

FIG. 7 is a front view showing a conventional broach mounting structure.

FIG. 8 is a side view of the same.

FIG. 9 is a bottom view of the same.

[Explanation of symbols]

 2 Holder 4 Linear Turn Brooch 12, 14 Cutting Edge Tip 30 Vertical Groove 32 Claw Member 32b Inclined Surface 50 Biasing Means 52 Horizontal Groove 52a Upper Wall Surface

Front page continued (72) Inventor Fukuyoshi Yasuhiro Gifu Pref. Kobe-cho Anza-gun, Kobe, Nakai, Yokoi 1528, Mitsubishi Materials Corporation Gifu Manufacturing (72) Inventor Hirohito Yoshimura 1 Toyota-cho, Aichi Prefecture Toyota Automobile Co., Ltd. (72) Inventor Tahiro Takasaki 1 Toyota Town, Toyota City, Aichi Toyota Motor Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A linear turn broach on the other side, which is formed in an elongated shape and has a plurality of cutting blade tips mounted on one side along the longitudinal direction, is linearly driven in the vertical direction. A fall prevention mechanism for a linear turn broach used for fixing to a side part of a holder, wherein the other side part of the linear turn broach slides vertically on the side part of the holder. A claw member is formed in which a vertical groove portion that can be formed is formed, and a tip portion that has an inclined surface that gradually inclines in a direction projecting toward the tip side from the upper side to the lower side is urged in the horizontal direction by the urging means and The linear turn broach, which is provided so as to be able to project a predetermined amount inward from the side of the groove and is inserted into the vertical groove, has an upper wall surface with the same inclination angle as the inclined surface of the pawl member. Formed on the claw portion Is formed with a lateral groove portion that can be engaged with the distal end portion of the linear biasing member, and the biasing force of the biasing means acts on the upper wall surface of the lateral groove portion of the linear turn broach that is engaged with the distal end portion of the pawl member. A fall prevention mechanism for a linear turn broach, which is set to have a strength equal to or greater than the strength of the linear turn broach to cancel the gravity.