JPS58223562A - Shot peening method of crank shaft pin - Google Patents

Abstract

PURPOSE:To eliminate variation in the effects of shot peening operation and provide arrangement to ensure safe work by spraying shot material to the pin part of one of the crank shafts from a nozzle mounted on the pin part of the other crank shaft. CONSTITUTION:This device is to make shot peening to the pin part 2 of a crank shaft 1 of a single cylinder engine. A crank shaft for processing 1 is rotated in linkage with handle operation, and another crank shaft 9 for retension of nozzle is also rotated through gears 5, 7, 13 synchronously in the same direction. If the handle 8 is rotated one turn, the pin part 2 of the shaft 1 is held always at a constant distance from the nozzle 14, and shots sprayed out of the nozzle 14 are cast evenly to the whole outside surface of this pin part 2. Further the distance time and place of this casting can be held constant, to ensure acquisition of uniform peening effect.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of shot peening a crankshaft pin portion.

In the conventional shot peening method for crankshaft pins, the crankshaft was placed in the cabinet of a blasting machine, the peening nozzle was held in hand, and the peening was aimed at the area that needed peening.

Therefore, in order to peen the entire outer circumference of the crankshaft pin, it was necessary to rotate the crankshaft, which is placed on a surface plate inside the cabinet, with one hand while holding the nozzle with the other hand. .

This causes variations in the projection distance, projection time, and projection location, which are the main factors that affect the peening effect, making it difficult to expect the same peening effect, and such work is hard work, which poses a safety problem.

Therefore, the present invention was devised in view of the above problems, and aims to eliminate the variation in shot peening effect,
Another object of the present invention is to provide a method of shot peening a crankshaft pin portion that can be performed extremely easily and safely. Therefore, the feature is that two crankshafts with the same amount of eccentricity are arranged in parallel with a predetermined distance apart, with their pin parts having the same phase and facing each other.
The method consists in injecting shot material from a nozzle provided on the pin section of one crankshaft toward the pin section of the other crankshaft while rotating both crankshafts synchronously in the same direction around their journal sections. .

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

#I: What is shown in Figures 1 and 2 is a device used in the first embodiment of the present invention, and this device shot-peens the pin portion (2) of the crankshaft (1) of a single-cylinder engine. It is something. This machining crankshaft (1) has both end journal parts (3) (3) connected to bearing members (4) (4).
), and a gear (5) is detachably attached to one end of this journal portion (3) via a key. This gear (5) meshes with a gear (7) which is freely rotatably mounted on the idle gear shaft (6). A manual handle (8) for rotating the crankshaft is detachably attached to one end of the crankshaft (1).

On the other hand, parallel to the processing crankshaft (1), a nozzle holding crankshaft (9) is rotatably supported at its journal portion αQ by a bearing member αυ. The eccentricity of the pin part (6) of 9) and the pin part (2) of the processing crankshaft (1) are the same,
In addition, the pin portions (2) are provided so that their axial centers are located on a straight line perpendicular to the crankshaft. A gear (to) meshing with the idle gear (7) is attached via a key to the journal portion αQ of the nozzle holding crankshaft (9). And both gears (7) (to)
is the pin part (2) of both crankshafts (1) (9) (to)
The phase of d! They mesh so that they are the same. A nozzle holding crankshaft (which meshes with a gear (5) provided on the processing crankshaft (1) via an idle gear (7)
The gear αJ of 9) has a number of teeth such that both the Funk shafts (1) and (9) rotate in the same direction and at the same rotation speed.

A shot injection nozzle αΦ is provided in the bottle part @ of the nozzle holding crankshaft (9) so as to be rotatable around a pin axis. This nozzle 04 is directed toward the pin part (2) of the processing crankshaft (1), and the tip of the nozzle JL/(141 and the pin part (2) always maintain a constant distance 6
Nozzle α4 is equipped with a flexible hose αe for pressure feeding shots.
is installed.

In the shot peening method of the present invention, which is carried out using the above-mentioned apparatus, the manual handle (8) is rotated with one hand, the nozzle α4 is held with the other hand, and the pin portion (2) of the processing crankshaft (1) is rotated. Aim and fire the shot.

The processing crankshaft (1) rotates in conjunction with the above handle operation, and the nozzle holding crankshaft (9) also rotates with the gear (5).
) (7) Rotate synchronously in the same direction via α3. Therefore, when the hand /L/(8) is rotated once, the pin part (2) of the processing crankshaft (1) and the nozzle α always maintain a constant distance, and the shot ejected from the nozzle α4 is ejected from the pin part (
2) It will be projected all around the outer circumference.

According to the first embodiment, the entire circumference of the pin portion (2) can be shot peened extremely easily by just operating the /'% handle (8) with one hand, and the projection distance, projection time,
Because the projection location can be kept constant.

A uniform peening effect without buffiness can be obtained. Furthermore, the above work is light labor and extremely safe work.

What is shown in FIGS. 3 and 4 is a second embodiment of the present invention, which is an automatic implementation of the method of the first embodiment.

The devices used in this method include a machining crankshaft (1), a nozzle holding crankshaft (a frame device Qe that rotatably supports and supports a 9-in, a transmission device a″i), a motor α frame with a speed reducer, are arranged in series, one end of the input shaft (A) of the transmission device α force is connected to the output shaft 09 of the motor α frame via a coupling Qυ, and the machining crankshaft is connected to the other end of the input shaft. (1) are connected via a coupling (support).The transmission device θ'7) is provided with an idle gear shaft (6) and an output shaft (to) that are parallel to the input shaft wheel. The gear (5) is connected to the idle shaft (6) through the key.
The gear (7) meshing with the gear (5) is connected to the output shaft (
2) are each provided with a gear αa that meshes with the idle gear (7) via a key. The end of the output shaft is slidably connected to a journal portion αO of a nozzle holding crankshaft (9) via a coupling (c). That is,
The distance between the frame device αQ and the transmission device 04 is configured to be variable in accordance with the length of the journal portion (3) of the processing crankshaft (1).

The pin part υ of the nozzle holding crankshaft (9) is cantilever-supported by the crank arm (c).
C) is provided only on one side. A nozzle holding stand (A) is provided on this pin part (2) so as to be rotatable around the bottle axis. A shot injection nozzle α4 is slidably mounted on the holding table via a feed screw.

This holding table (to) is provided with a leveling device, which consists of an arm holder fixedly attached to the rear of the holding table in a downwardly protruding manner, and a lobe (not shown) provided at the lower end of the arm holder. (to) and a guide member 0υ into which the rope member is removably fitted. The guide member 0υ is fixed to the end face of the frame (to), and a ring having an axis having the same diameter and parallel to the center rotation locus circle (0) of the bottle part (2) of the crankshaft (1) is attached to the end face of the guide member Op. ) is provided in the groove Q, and the lobe (to) is fitted into the groove Q.

According to the second embodiment of the present invention, the machining crankshaft (1) and the nozzle holding crankshaft (9) are rotated synchronously in the same direction by the drive of the motor (to), and the nozzle α4 is always oriented horizontally. Fully automatically shot peening the outer periphery of the bottle part (2). In the first embodiment, as shown in FIG. 2, the nozzle α4 freely rotates around the pin part (2), so it is always aimed accurately at the pin part (2) of the processing crankshaft (1). However, according to this second embodiment, the nozzle α4) is
It is convenient because it is always maintained horizontally so as to aim at the bottle part (2). Further, the distance between the tip of the nozzle A4 and the bottle part (2) can be changed by rotating the feed screw handle, which is convenient.

What is shown in FIGS. 5 to 7 is a third embodiment of the present invention, in which a multi-cylinder crankshaft (1) is subjected to shot peening. Therefore, the nozzle holding crankshaft (9)
The crankshaft also has a bin part @ corresponding to the bin part (2) of the crankshaft (1). This device is a processing crankshaft (1)
The journal portion αO of the nozzle holding crankshaft (9) is slidably connected via a coupling in order to cope with changes in the pitch of the bin portion. In addition, the crank arm (to) of the nozzle holding crankshaft (9) is configured to be extendable and retractable in order to cope with changes in the eccentricity of the bottle part (2) of the processing crankshaft (1). If it is necessary to change the estimated distance of the two-wheel drive shafts (1) and (9) due to a change in eccentricity, the idler l @ (6) is fixed to rotate around the input shaft shaft in order to make that change possible. The output shaft (C) is movable and fixed in the direction of separation from the crankshaft. The horizontal maintenance device (to) includes a rod (to) that projects horizontally rearward from the nozzle holding base, a slider (to) that is slidable on the rod (to), and a rod (to). A slider (B) that is perpendicular to the slider (B) and fixed so that the mounting position of the slider (B) can be changed; and a guide member (B) that fits the slider (B) slidably in a direction perpendicular to the rod (B). ).

According to this third embodiment, it is possible to simultaneously shot-peen a plurality of bin portions (2) of a multi-cylinder crankshaft (1), and the dimensions of the processing crankshaft (1) are changed to accommodate the present invention. It can be very versatile.

Similarly, the present invention is not limited to each of the above-mentioned embodiments, but can also be applied to sound blasting of eccentric members, etc. (Also, the transmission device is not limited to a gear transmission.) According to the present invention, uniform shot peening can be performed extremely easily and safely over the entire circumference of the pin portion.

[Brief explanation of the drawing]

The figures show an apparatus used in the present invention, in which Figure 1 is a partially sectional front view of the first embodiment, Figure 2 is a sectional view taken along the line ■-■ in Figure 1,
FIG. 3 is a partially sectional front view of the second embodiment, FIG. 4 is a sectional view taken along line 3--y in FIG. 3, FIG. 5 is a partially sectional plan view showing the third embodiment, and FIG. Figure 5 is a sectional view taken along the line Vl-Vl, and Figure 7 is
FIG. 5 is a sectional view taken along the line ■-■. (1)...Crankshaft for processing, (2)...Bin part,
(3)...Journal part, (9)...Crankshaft for nozzle holding, αO...Journal part, (2)...Bin part, α→...Nozzle.

Claims (1)

[Claims] 1. Two crankshafts with the same amount of eccentricity are arranged parallel to each other with a predetermined distance apart, with their pin parts having the same phase and facing each other, and both crankshafts are arranged in the same manner around their journal parts. A shot peening method for a crankshaft pin portion, which is characterized in that a shot material is injected from a nozzle provided on the pin portion of one crankshaft toward the pin portion of the other crankshaft while rotating the crankshaft synchronously in the direction.