CN101600871A - Mounting structure of the pulse generator board - Google Patents

Abstract

The mounting structure of the pulse generator plate of the present invention is formed by forming a keyway (14) on the mounting surface (10) of the rotating wall portion (9) composed of the crank arm (3) and the counterweight (4). On the pulse generator plate (P) overlapping with the mounting surface (10), the key portion (16) engaging with the key groove (14) is formed, and the pulse generator plate (P) is made of a fastening member (18). P) fastened on the swivel wall part (9), wherein the key part (16) protrudes arcuately from the pulse generator plate (P) at one end face side of the pulse generator plate (P) and fits into the keyway (14 ) and a pair of connecting parts (16b) integrally connecting both ends of the arcuate belt (16a) to the pulse generator board (P). In this way, it is possible to provide a pulsator plate mounting structure with high positioning accuracy of the pulsator plate relative to the crankshaft and high productivity of the pulsator plate.

Description

Mounting structure of the pulse generator board

technical field

The present invention relates to an improvement in the mounting structure of a pulse generator plate formed by forming a keyway on the end face of a rotating wall portion composed of a crank arm and a counterweight of a crankshaft for an internal combustion engine, and on the other hand, engaging the keyway with the above-mentioned keyway. A joint key portion is formed on the pulse generator plate overlapping with the above-mentioned end surface, and the pulse generator plate is fastened to the above-mentioned rotating wall portion with a fastening member.

Background technique

The mounting structure of the above-mentioned pulse generator board is known as disclosed in Patent Document 1. As shown in FIG.

Patent Document 1: Japanese Patent Application Laid-Open No. 10-331681

In the conventional installation structure of the above-mentioned pulse generator board, the key portion is formed by an L-shaped bent portion cut out from the pulse generator board on one end surface side of the pulse generator board. It is supported on the pulse generator plate in a cantilever type, so the rigidity is low, and it is difficult to improve the positioning accuracy of the pulse generator plate relative to the crankshaft. Corners and other finishing, so the processing man-hours are many, and the productivity is not good.

Contents of the invention

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a pulse generator board mounting structure with high positioning accuracy of the pulse generator board relative to the crankshaft and good productivity of the pulse generator board.

In order to achieve the above object, the first feature of the present invention is that the mounting structure of the pulse generator plate is formed by forming a key groove on the end surface of the rotating wall portion composed of the crank arm and the counterweight of the crankshaft for an internal combustion engine, which is compatible with the The key part that is engaged with the key groove is formed on the pulse generator plate coincident with the end face, and the pulse generator plate is fastened on the rotating wall part by using a fastening member, wherein the key part is formed by a bow The arc-shaped strip protrudes arcuately from the pulse generator plate on the one end surface side of the pulse generator plate and engages with the key groove, and a pair of connecting portions. Both ends of the arcuate ribbon are integrally connected to the pulse generator plate.

In addition, the end surface of the rotating wall portion corresponds to the mounting surface 10 in the embodiment of the present invention described later, the fastening member corresponds to the bolt 18 , and the fastening portion corresponds to the recess 12 and the boss 15 .

Furthermore, in addition to the first feature, a second feature of the present invention is that the arcuate belt-shaped portion is arranged such that its longitudinal direction is along a radial line of the pulse generator plate.

Further, on the basis of the first feature, the third feature of the present invention is that the interlocking said keyway and said arcuate belt-shaped portion are arranged in such a way that their length direction is along the radial line of the pulse generator plate configuration.

Further, on the basis of the first feature, the fourth feature of the present invention is that a long hole is perforated on the pulse generator plate, and the two sides of the arcuate strip face the long hole respectively.

Furthermore, on the basis of the first feature, the fifth feature of the present invention is that the fastening member fastens the pulse generator plate and the rotating wall part to form a fastening part, and the fastening part is located at The pulse generator plate has a plurality of positions arranged in the circumferential direction, and the circumferential intervals between the fastening part of at least one position and the fastening parts of other positions adjacent to the fastening part on both sides of the one position are different from each other .

Furthermore, on the basis of the first feature, the sixth feature of the present invention is that, on the end face of the rotating wall part, a plurality of recesses arranged along the circumferential direction of the end face are formed, and on the pulse generator plate are formed A plurality of bottomed cylindrical bosses accommodated in the plurality of recesses are fastened to the pulse generator plate by the fastening member, and the cylindrical portion of the boss is formed in a special-shaped Cylindrical, that is, the short diameter of the cylindrical portion is along the circumferential direction of the pulse generator plate, and the long diameter of the cylindrical portion is along the radial direction of the pulse generator plate.

Furthermore, in addition to the sixth feature, the seventh feature of the present invention is that the cylindrical portion of the boss is formed in an elliptical cylindrical shape.

Furthermore, in addition to the sixth feature, an eighth feature of the present invention is that the curvature of the curved portion connected to both ends of the cylindrical portion of the boss is set to be smaller on the short diameter side than on the long diameter side.

Furthermore, in addition to the first feature, a ninth feature of the present invention is that a rib protruding from one end surface side of the pulse generator and extending in the circumferential direction is formed on the pulse generator plate.

Furthermore, the tenth feature of the present invention is that, in addition to the ninth feature, the rib protrudes from the end surface of the pulse generator plate on the side of the rotating wall, and a rib receiving groove for accommodating the rib is formed in the rib. on the rotating wall.

Furthermore, according to an eleventh feature of the present invention, in addition to the ninth feature, the rib is formed in a ring shape over the entire circumference of the pulse generator plate.

Furthermore, the twelfth feature of the present invention is that, on the basis of the ninth feature, a plurality of recesses arranged in the circumferential direction of the end face are formed on the end face of the rotating wall part, and a plurality of recesses are formed on the pulse generator plate. a plurality of bottomed cylindrical bosses, the bosses are accommodated in the plurality of recesses and fastened to the pulse generator plate by the fastening member, and these bosses are fastened by the ring-shaped ribs The stages are connected to each other, the annular rib protrudes from the end surface of the pulse generator plate on the side of the rotating wall, and a rib receiving groove for receiving the annular rib is formed in the rotating wall. end face of the section.

Further, the thirteenth feature of the present invention is that, on the basis of the ninth feature, the height of the rib is set to be smaller than the height of the boss, and the depth of the rib storage groove is set to be lower than the height of the storage slot. The depth of the concave portion of the boss is small.

Further, a fourteenth feature of the present invention is that, in addition to the ninth feature, a through hole is formed in the half of the pulse generator plate on the side of the crank arm.

According to the first feature of the present invention, since the key portion is composed of an arcuate band protruding arcuately from the pulser plate on one end face side of the pulser plate and engaging with the key groove and both ends of the arcuate band A pair of connecting parts integrally connected to the pulse generator board constitutes, so the key part is supported on the pulse generator board in a manner held at both ends, and has high rigidity, so it can cooperate with the key groove to improve the pulse generator board Positioning accuracy relative to the crankshaft. In addition, since there is no sharp point on the key held at both ends, it is not necessary to perform finishing work such as chamfering after pressing, and the productivity of the pulser plate can be improved.

According to the second feature of the present invention, the two sides of the keyway and the arcuate strip extending in the radial direction of the pulse generator plate abut against each other over a wide range, so that the pulse generator plate can be more accurately held relative to the pulse generator plate. Predetermined circumferential position of the crankshaft.

According to the third feature of the present invention, since the counterweight has a wide end surface that overlaps with the pulse generator plate, the key groove can be easily formed without thickening the end surface. Therefore, the degree of freedom of design is high, and the productivity is good, and at the same time, loss of weight balance due to thickening of the crankshaft can be prevented.

According to the fourth feature of the present invention, the press-forming of the arcuate band portion of the key portion can be easily performed without being hindered by the pulser plate main body.

According to the fifth feature of the present invention, the installation position of the pulse generator plate with respect to the rotating wall portion of the crankshaft is limited to one position, so that misassembly can be prevented, thereby preventing damage to the key portion caused by misassembly.

According to the sixth feature of the present invention, since the cylindrical part of the boss of the pulse generator plate is formed into a special-shaped cylindrical shape whose short diameter is along the circumferential direction of the pulse generator plate and whose long diameter is along the radial direction of the pulse generator plate Therefore, in the operation of the engine, if the plate-shaped portion between the adjacent bosses of the pulse generator plate vibrates, the vibration is transmitted to the peripheral portion of the special-shaped cylindrical portion within the range of the long diameter, Therefore, the stress caused by the vibration is widely dispersed to the peripheral portion of the special-shaped cylindrical portion within the range of the long diameter, and durability around the respective bosses can be realized.

According to the seventh feature of the present invention, since the curvature of the elliptical cylindrical portion of the bosses of the pulser plate changes extremely smoothly, the stress is dispersed ideally, and the durability around the bosses can be effectively improved.

According to the eighth feature of the present invention, by setting the curvature of the curved portion connected to both ends of the cylindrical portion of the boss of the pulse generator plate to be smaller on the short diameter side than on the long diameter side, when the pulse generator plate When the plate-shaped portion between adjacent bosses vibrates, the concentrated stress generated in the flange portion on the short-diameter side of the bosses (that is, the peripheral side of the pulser plate) can be more widely dispersed, thereby The durability around each boss can be further improved.

According to the ninth feature of the present invention, since the rib protruding from one end surface side of the pulse generator plate and extending in the circumferential direction is formed on the pulse generator plate, the rigidity of the pulse generator plate can be strengthened by the rib, and effective effectively dampen the vibration of the pulse generator board. In addition, since the thickness of the pulse generator plate does not need to be increased deliberately, it contributes to the weight reduction of the crankshaft system, and when the pulse generator plate is fastened to the rotating wall, it is not necessary to increase the fastening force deliberately. position, so the degree of freedom in design is high.

According to the tenth aspect of the present invention, since the rib protrudes from the end face of the pulse generator plate on the rotating wall portion side, and the rib receiving groove for accommodating the rib is formed in the rotating wall portion, the rib does not Since the protrusion protrudes from the outer end surface of the pulsator plate, the pulsator plate can be disposed close to the inner wall of the crankcase.

According to the eleventh feature of the present invention, since the ribs are formed in a ring shape over the entire circumference of the pulse generator plate, the rigidity of the pulse generator plate can be generally strengthened over the entire circumference of the pulse generator plate, and it is possible to Effectively dampens the vibration of the pulse generator board.

According to the twelfth feature of the present invention, since the rib is formed in an annular shape and connects a plurality of highly rigid bosses together, it is possible to further effectively The rigidity of the pulse generator board is strengthened, so the vibration of the pulse generator board can be further effectively suppressed.

According to the thirteenth feature of the present invention, since the height of the rib is set to be smaller than the height of the boss, the rigidity of the connecting portion between the rib and the boss can be increased, and the pulse generator plate can be further realized. rigidity reinforcement. At the same time, since the depth of the rib receiving groove is set to be smaller than the concave portion of the housing boss, the rib receiving groove and the concave portion can be easily cut and processed on the mounting surface of the rotating wall portion without mutual interference, thereby improving the workability. good.

According to the fourteenth feature of the present invention, since through holes are formed in the crank arm side half of the pulse generator plate, the weight of the crank arm side half of the pulse generator plate can be reduced through these through holes. A corresponding amount can be subtracted from the counterweight, and the crankshaft system can be reduced in weight.

The above and other objects, features, and advantages of the present invention will become more apparent from the description of preferred embodiments described in detail below with reference to the accompanying drawings.

Description of drawings

Fig. 1 is a longitudinal sectional side view of main parts of a crankshaft for an internal combustion engine having a structure for mounting a pulse generator plate according to a first embodiment of the present invention. (first embodiment)

FIG. 2 is a view viewed from the direction of arrow 2 in FIG. 1 . (first embodiment)

Fig. 3 is an enlarged sectional view taken along line 3-3 of Fig. 2 . (first embodiment)

4 is a longitudinal sectional side view of main parts of a crankshaft for an internal combustion engine having a mounting structure for a pulse generator plate according to a second embodiment of the present invention. (second embodiment)

FIG. 5 is a view viewed from the direction of arrow 5 in FIG. 4 . (second embodiment)

Fig. 6 is an enlarged sectional view taken along line 6-6 of Fig. 5 . (second embodiment)

Fig. 7 is an enlarged sectional view taken along line 7-7 of Fig. 5 . (second embodiment)

FIG. 8 shows a third embodiment of the present invention, and is an enlarged view corresponding to the main part of FIG. 5 . (third embodiment)

FIG. 9 shows a fourth embodiment of the present invention and is a diagram corresponding to FIG. 3 . (fourth embodiment)

10 is a longitudinal sectional side view of main parts of a crankshaft for an internal combustion engine having a mounting structure for a pulser plate according to a fifth embodiment of the present invention. (fifth embodiment)

Fig. 11 is a view seen from the direction of arrow 11 in Fig. 10 . (fifth embodiment)

Fig. 12 is an enlarged sectional view taken along line 12-12 of Fig. 11 . (fifth embodiment)

Fig. 13 is an enlarged sectional view taken along line 13-13 of Fig. 11 . (fifth embodiment)

Fig. 14 is an enlarged sectional view taken along line 14-14 of Fig. 11 . (fifth embodiment)

Fig. 15 is an enlarged sectional view taken along line 15-15 of Fig. 11 . (fifth embodiment)

FIG. 16 shows a sixth embodiment of the present invention and is a diagram corresponding to FIG. 11 . (sixth embodiment)

Fig. 17 is a sectional view taken along line 17-17 of Fig. 16 . (sixth embodiment)

Label description

A: the circumferential direction of the pulse generator plate; B: the radial direction of the pulse generator plate; C: crankshaft; D1: short diameter; D2: long diameter; H1: rib height; H2: boss height; h1: rib Depth of storage groove; h2: Depth of recess; P: Pulser plate; S1, S2: Interval between fastening parts in the circumferential direction; 3: Crank arm; 4: Counterweight; 9: Rotating wall; 10: End face ; 12, 15: fastening part (recess, boss); 14: keyway; 15a: cylindrical part; 16: key part; 16a: arcuate band part; ;19: long hole; 25: rib; 26: rib storage slot; 27: through hole

Detailed ways

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

first embodiment

First, the description will start from the description of the first embodiment of the present invention shown in FIGS. 1 to 3 . In Fig. 1 and Fig. 2, the crankshaft C is a crankshaft for a multi-cylinder internal combustion engine, which has: a plurality of journals 1 supported by a plurality of main bearings of the crankcase; Crank pin 2; and a plurality of crank arms 3 that are integrally connected between adjacent journals 1 and crank pins 2, and counterweights 4 are integrally connected and arranged on each crank arm 3, and the counterweights 4 are separated by The center axis of the journal 1 extends in the opposite direction to the crank arm 3 . In addition, a flange 5 is formed at one end of the crankshaft C, and a driven member such as a crank pulley or a flywheel is bolted to the flange 5 .

As shown in FIG. 2 , the crank arm 3 is formed to be narrow in the circumferential direction, and the counterweight 4 is formed to be wide in the circumferential direction. The crank arm 3 and the counterweight 4 constitute the rotating wall portion 9 . Furthermore, a pulse generator plate P formed by press-molding a magnetic metal plate is attached to the outermost rotating wall portion 9 on the flange 5 side. A plurality of protrusions 7 are arbitrarily arranged on the outer periphery of the pulse generator plate P, and a rotation sensor (not shown) provided on the device main body is arranged to face the outer peripheral surface of the pulse generator plate.

Furthermore, in the above-mentioned rotation sensor, since the Hall element and the magnet are built in the detection part thereof, when the pulser plate P rotates together with the crankshaft C, the magnetic variation in the rotation sensor is converted into an electric signal by the Hall element , the rotational position, rotational speed, rotational acceleration, etc. of the crankshaft C can be known by calculating the electrical signal.

Next, an attachment structure for attaching the pulser plate P to the rotating wall portion 9 of the crankshaft C will be described with reference to FIGS. 1 to 3 .

As shown in FIG. 1 , on the outer end surface of the outermost rotating wall portion 9 , an annular positioning step 8 with a diameter larger than the flange 5 and concentric with the journal 1 is formed; and from the annular positioning step 8 The root of the crank arm 3 and the mounting surface 10 of the counterweight 4 expand radially. Slopes 3 a for thinning the wall thickness of the crank arm 3 are formed on both sides of the outer surface of the crank arm 3 along the rotation direction, so that the mounting surface 10 is formed narrower on the crank arm 3 side than on the counterweight 4 side. .

As shown in FIGS. 1 and 2 , a plurality of (four in the illustrated example) concave portions 12 of the same shape (circular in the illustrated example) arranged in the circumferential direction are provided on the mounting surface 10 . At this time, the four recesses 12 are arranged such that the respective circumferential intervals S1 , S2 between at least one recess 12 and other recesses 12 adjacent to both sides of the one recess 12 are different from each other. In the case of the illustrated example, the four recesses 12 are arranged such that the circumferential intervals between the respective adjacent recesses 12 on the imaginary circle 20 concentric with the journal 1 are all different. Furthermore, screw holes 13 are respectively formed in the centers of the four recesses 12 . Further, a key groove 14 is formed at a predetermined position of the mounting surface 10 on the counterweight 4 side. At this time, the key groove 14 is arranged such that its longitudinal direction is along the radial line of the pulse generator board P. As shown in FIG.

On the other hand, a positioning hole 11 fitted with the annular positioning step 8 is formed at the center of the pulse generator plate P, and four bottomed cylindrical holes 11 are formed to surround the positioning hole 11 . Bosses 15 , the four bosses 15 are respectively fitted in the four recesses 12 , and bolt holes 17 corresponding to the threaded holes 13 of the recesses 12 are provided at the bottom of each boss 15 .

Further, a key portion 16 that engages with the key groove 14 is integrally formed on the pulse generator board P. As shown in FIG. The key portion 16 is constituted by an arcuate strip portion 16a protruding arcuately from the pulser plate P on one end face side of the pulser plate P, and a pair of connecting portions 16b. 16b integrally connects both ends of the arcuate strip 16a to the pulse generator plate P, and like the keyway 14, the arcuate strip 16a is along the radius of the pulse generator plate P along its length direction. direction, and fit between the two inner surfaces of the key groove 14 (refer to FIG. 3 ). Furthermore, all the bosses 15 of the pulse generator board P are loosely fitted in all the recesses 12 of the mounting surface 10 when this arcuate strip 16 a is tightly fitted in said keyway 14 .

When forming the key portion 16, at first, punch a pair of long holes 19 (refer to FIG. The arcuate strip 16a sandwiched between the two long holes 19 is stamped and formed by means of stamping. By doing so, the arcuate strip 16a can be easily formed without being hindered by the main body of the pulse generator plate.

Next, the action of this embodiment will be described.

When installing the pulse generator board P on the mounting surface 10 of the rotating wall portion 9, first, from the flange 5 side of the crankshaft C, the positioning hole 11 of the pulse generator board P is fitted into the rotating wall. The annular positioning of the portion 9 is on the stepped portion 8 . At this time, while engaging the key portion 16 of the pulse generator board P in the key groove 14 of the mounting surface 10, each boss 15 of the pulse generator board P is fitted into the corresponding concave portion 12 of the mounting surface 10. , while superimposing the pulse generator board P on the mounting surface 10 . Next, by screwing and tightening the bolts 18 inserted through the bolt holes 17 into the threaded holes 13 , the pulse generator board P can be correctly mounted at a predetermined position on the above-mentioned mounting surface 10 . At this time, the heads 18a of the bolts 18 are accommodated in the corresponding bosses 15 and do not become protrusions protruding from the outer end surface of the pulsator plate P, so the pulsator plate P can be disposed close to the inner wall of the crankcase.

However, since the key portion 16 of the pulsator board P consists of the arcuate band 16a protruding arcuately from the pulsator board P on one end surface side of the pulsator board P and engaging with the key groove 14 and the arcuate band The two ends of the key portion are integrally connected to a pair of connecting parts 16b on the pulse generator board P, so the key part 16 is supported on the pulse generator board P in a manner held at both ends, thereby having a high rigidity. The circumferential positioning accuracy of the pulse generator plate P relative to the mounting surface 10 , ie relative to the crankshaft C can thus be improved in cooperation with the key groove. In addition, since there is no sharp point on the key portion 16 held at both ends, finishing such as chamfering is not required after the press working, and the productivity of the pulser plate P can be improved.

In particular, since the key groove 14 and the arcuate strip 16a that fit together are arranged along the radial direction of the pulse generator plate P, the keyway 14 and the arcuate strip 16a along the radial direction of the pulse generator plate P Both side surfaces are in contact with each other over a wide range, so that the predetermined circumferential position of the pulse generator plate P with respect to the crankshaft C can be maintained more accurately.

And, as mentioned above, since the counterweight 4 side of the mounting surface 10 is wider than the crank arm 3 side, when the key groove 14 is formed on the mounting surface 10 on the counterweight 4 side, the key groove 14 can be selected in a wide range. Forming the position increases the degree of freedom in design and facilitates the positioning of the pulse generator board P. In addition, since the mounting surface 10 does not need to be thickened when the key groove 14 is formed, productivity is good, and weight balance loss due to thickening of the crankshaft C can be prevented.

Further, since the bolts 18 fasten the pulse generator plate P and the rotating wall portion 9 to form a fastening portion, that is, the concave portion 12 and the boss 15, and the fastening portion is arranged on the circumferential direction of the pulse generator plate P. multiple positions, and the circumferential intervals S1, S2 between the fastening parts 12, 15 at at least one position and the fastening parts 12, 15 at other positions adjacent to the fastening parts 12, 15 on both sides of the one position are mutually Therefore, the mounting position of the pulse generator board P relative to the rotating wall portion 9 is limited to one position, so that misassembly can be prevented, and damage to the key portion 16 caused by misassembly can be prevented.

In addition, in the above, the fastening part formed by fastening the pulse generator plate P and the rotating wall part 9 with the bolt 18 only needs to be located at least two positions. In the case of only two positions, if the two positions The circumferential intervals on both sides of the fastening portion are different, so that wrong assembly can be prevented.

second embodiment

Next, a second embodiment of the present invention shown in FIGS. 4 to 7 will be described.

Each boss 15 of the pulse generator plate P is in the shape of a bottomed ellipse cylinder, and the short diameter D1 of the ellipse cylindrical portion 15a is along the circumferential direction A of the pulse generator plate P, and the long diameter D2 is along the circumference direction A of the pulse generator plate P. The radial direction B is configured.

However, the wall thickness of the pulse generator plate P produced by stamping is relatively thin. Therefore, when the torque of the crankshaft C fluctuates during the operation of the engine, the plate-shaped part between adjacent bosses 15 vibrates violently. In the second embodiment, since the cylindrical portion 15a of each boss 15 is formed such that the short diameter D1 is along the The circumferential direction A and major diameter D2 of the pulse generator plate P are along the elliptical cylindrical portion 15a of the radial direction B of the pulse generator plate P, so the vibration of the plate-shaped portion between the bosses 15 of the pulse generator plate P is Therefore, the stress caused by the vibration is widely dispersed in the peripheral part of the elliptic cylindrical part 15a within the range of the major diameter D2, so that various vibrations can be realized. Durability around boss 15. In particular, since the curvature of the ellipse of the elliptical cylindrical portion 15a changes very smoothly, it is ideal in terms of stress dispersion, and the durability around each boss 15 can be effectively improved.

In addition, this second embodiment has a structure capable of achieving the same effects as those of the above-mentioned first embodiment. In FIGS. , omitting repeated descriptions.

third embodiment

Next, a third embodiment of the present invention shown in FIG. 8 will be described.

In this third embodiment, the cylindrical portion 15a of the boss 15 of the pulse generator plate P continuously connects a pair of arc wall portions 22 and a pair of straight wall portions 23 to form a small stamp shape in section, and the pair of circular The arc wall portions 22 face each other at a distance corresponding to the long diameter D2, and the pair of straight wall portions 23 face each other at a distance corresponding to the short diameter D1. At this time, similar to the above-mentioned embodiment, the cylindrical portion 15a of the boss 15 is arranged such that the short diameter D1 is along the circumferential direction A of the pulse generator plate P, and the long diameter D2 is along the radial direction B of the pulse generator plate P. configuration. The configuration other than that is the same as that of the above-mentioned second embodiment. Therefore, in FIG. 8, the parts corresponding to the second embodiment are given the same reference numerals, and their descriptions are omitted.

Also according to this third embodiment, substantially the same effects as those of the second embodiment described above can be exhibited.

Fourth embodiment

Next, a fourth embodiment of the present invention shown in FIG. 9 will be described.

In this fourth embodiment, the curvature of the curved portion connected to both ends of the elliptical cylindrical portion 15a of the boss 15 of the pulser plate P is formed to be smaller on the side of the short diameter D1 than on the side of the long diameter D2 (see FIG. 7 ). )Small. The configuration other than that is the same as that of the above-mentioned second embodiment. Therefore, in FIG. 9 , the parts corresponding to the above-mentioned second embodiment are given the same reference numerals, and redundant descriptions are omitted.

According to this fourth embodiment, when the plate-like portion between the adjacent bosses 15 of the pulser plate P vibrates violently, it is possible to make the pulser plate P especially on the short diameter D1 side of the bosses 15 (that is, the pulser plate P The concentrated stress generated in the peripheral portion of the P circumferential direction B side) is more widely dispersed, thereby further improving the durability around the respective bosses 15 .

fifth embodiment

Next, a fifth embodiment of the present invention shown in FIGS. 10 to 15 will be described.

Same as the above-mentioned first embodiment, on the outer end surface of the outermost rotating wall portion 9 of the crankshaft C, an annular positioning step portion 8 with a diameter larger than the flange 5 and concentric with the journal 1 is formed; The root of the shaped positioning step portion 8 faces toward the mounting surface 10 where the crank arm 3 and the counterweight 4 expand in the radial direction. A plurality of (four in the illustrated example) recesses 12 of the same shape (circular in the illustrated example) are arranged on the mounting surface 10 in a circumferential direction. At this time, the four recesses 12 are arranged such that the respective circumferential intervals S1 and S2 between at least one recess 12 and other recesses 12 adjacent to both sides of the one recess 12 are different from each other. The four recesses 12 are arranged such that the circumferential intervals between adjacent recesses 12 on a virtual circle 20 concentric with the journal 1 are all different.

On the pulsator plate P, an annular rib 25 protruding from one end face of the pulsar plate P is formed along the virtual circle 20 described above. Therefore, the four bosses 15 arranged on the virtual circle 20 are connected to each other via the rib 25 . At this time, the height H1 of the rib 25 is set to be smaller than the height H2 of the boss 15 , and as a result, a step e is provided between the rib 25 and the boss 15 . Along with this, the depth of the rib housing groove 26 of the mounting surface 10 is set to be smaller than the depth of the concave portion 12 for housing the boss 15 .

The ribs 25 protrude from the end surface of the pulsator plate P on the mounting surface 10 side of the rotating wall portion 9 , and rib housing grooves 26 for accommodating the ribs 25 are formed on the mounting surface 10 .

As shown in FIGS. 13 and 14 , the rib receiving groove 26 crosses the key groove 14 on the mounting surface 10 , and the groove width of the rib receiving groove 26 is set to be smaller than the length of the key groove 14 . Thus, the key groove 14 and the key portion 16 of the pulsator plate P can be securely engaged with each other to perform a positioning function with respect to the pulsator plate P despite the presence of the rib housing groove 26 .

Further, as shown in FIG. 11 and FIG. 15 , on the pulse generator plate P, a plurality of through holes 27 are perforated in a manner of being aligned in the circumferential direction only in the half portion on the side of the crank arm 3 .

In addition, this fifth embodiment has a structure capable of achieving the same effects as those of the above-mentioned first embodiment. In FIGS. Repeat instructions.

However, since the thickness of the pulse generator plate P produced by pressing is relatively thin, when the torque of the crankshaft C fluctuates during engine operation, there is a tendency for the plate-shaped portion between adjacent bosses 15 to vibrate violently. In the fifth embodiment, since the rib 25 protruding from one end surface of the pulse generator plate P and extending in the circumferential direction is formed on the pulse generator plate P, the rigidity of the pulse generator plate P can be enhanced by using the rib 25 . In particular, since the ribs 25 are ring-shaped over the entire circumference of the pulsar plate P, the rigidity of the pulsar plate P can be generally reinforced over the entire circumference, and vibration of the pulsar plate P can be effectively suppressed. In addition, since the thickness of the pulse generator plate P does not need to be increased intentionally, it contributes to the reduction in weight of the crankshaft C system, and when the pulse generator plate P is fastened to the rotating wall portion 9 with bolts 18, the On the side of the crank arm 3 with a narrow area, the problem can be solved with a small number of fastening locations such as only one location. That is, there is no need to deliberately increase the number of fastening locations, so that the degree of freedom in design is high.

The above-mentioned rib 25 is made to protrude from the end surface of the pulse generator plate P on the side of the rotating wall portion 9, and the recess 12 for receiving the rib 25 is formed on the mounting surface 10 of the rotating wall portion 9, so that the rib 25 does not become a protrusion protruding from the outer end surface of the pulsator plate P, so the pulsator plate P can be arranged close to the inner wall of the crankcase.

Moreover, since the heads 18a of the bolts 18 housed in the recesses 12 are also housed in the corresponding bosses 15, they do not become protrusions protruding from the outer end surface of the pulser plate P, and therefore can be disposed close to the crankcase inner wall. Pulse generator board P.

Furthermore, since the rib 25 is formed in an annular shape and connects a plurality of highly rigid bosses 15 , the rigidity of the pulse generator plate P can be further effectively enhanced through the cooperation of the annular rib 25 and the plurality of bosses 15 . At this time, the height H1 of the rib 25 is set to be smaller than the height H2 of the boss 15, thereby forming a step difference e between the rib 25 and the boss 15, which improves the connecting portion between the rib 25 and the boss 15. The rigid aspect is valid. Along with this, setting the depth of the rib housing groove 26 to be smaller than that of the concave portion 12 for housing the boss 15 enables easy cutting and machining on the mounting surface 10 of the rotating wall portion 9 without mutual interference. The aspect of the rib receiving groove 26 and the recessed portion 12 is effective.

That is, when the rib housing groove 26 and the concave portion 12 are cut, no matter which one is performed first, the other will not be interfered with. If the rib storage groove 26 is deeper than the recessed part 12, the rib storage groove 26 will be obstructed by the bottom part of the recessed part 12, and it will not be able to cut at once. In addition, since the rib receiving groove 26 follows the annular rib 25, the rib receiving groove 26 can be easily turned by turning the crankshaft C around the journal once.

Furthermore, by reinforcing the rigidity of the pulsator plate P with the ring-shaped rib 25, a plurality of through holes 27 can be formed in the pulsator plate P to achieve weight reduction. At this time, if the plurality of through holes 27 are provided only in the half of the crank arm 3 side, these through holes 27 can realize the weight reduction of the half of the crank arm 3 side of the pulse generator plate P, and can reduce the weight from the counterweight 4. Reduce the corresponding amount, so that the weight of the crankshaft C system can be realized.

Sixth embodiment

Next, a sixth embodiment of the present invention shown in FIGS. 16 and 17 will be described.

In this sixth embodiment, a plurality of ribs 28 radially extending from an annular rib 25 are formed on a portion of the pulse generator plate P exposed from the mounting surface 10 on the crank arm 3 side. In addition, since it is the same structure as the above-mentioned fifth embodiment except that the through-hole 27 like the above-mentioned embodiment is not provided on the pulse generator board P, in FIG. 16 and FIG. 17, the Portions corresponding to those of the fifth embodiment described above are given the same reference numerals and descriptions thereof are omitted.

According to the sixth embodiment, the rigidity of the pulse generator plate P is further strengthened through the cooperation of the annular rib 25 and the radial rib 28, especially the rigidity of the portion exposed from the mounting surface 10 on the crank arm 3 side is further strengthened, thereby Vibration of this part can be effectively prevented.

The present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the gist. For example, in each of the above-mentioned embodiments, the fastening portion for fastening the pulse generator plate P and the rotating wall portion 9 by bolts 18 only needs to be located in at least two positions. If the circumferential intervals on both sides of the fastening portion at the two positions are different, misassembly can be prevented. In addition, in the above-mentioned fifth and sixth embodiments, two or more ring-shaped ribs 25 may be formed concentrically, and may be arranged on the radially inner side or outer side of the plurality of bosses 15 arranged in a ring shape. . Furthermore, the key portion 16 can be provided inside or outside the annular rib 25 so as not to interrupt the annular rib 25 , which is effective in improving the reinforcing function of the rib 25 .

Claims (as amended under Article 19 of the Treaty)

1. An installation structure of a pulse generator board,

The installation structure of the pulse generator plate is formed by forming on the end surface (10) of the rotating wall part (9) composed of the crank arm (3) and the counterweight (4) of the internal combustion engine crankshaft (C) A keyway (14), a key portion (16) engaged with the keyway (14) is formed on the pulse generator plate (P) overlapping with the end surface (10), and the fastening member (18) is used to place the The pulse generator plate (P) is fastened on said rotating wall part (9), characterized in that,

The key portion (16) is constituted by an arcuate strip portion (16a) from the pulse generating The device plate (P) protrudes in an arcuate shape and engages with the keyway (14), and the pair of connecting parts (16b) integrally connects both ends of the arcuate belt-shaped part (16a) to the pulse generator on the plate (P),

The key groove (14) and the arcuate band (16a) engaged with each other are arranged such that their longitudinal direction is along the radial line of the pulse generator plate (P).

2. The mounting structure of the pulse generator board according to claim 1, characterized in that:

The keyway (14) is formed on the end face (10) of the counterweight (4).

3. The mounting structure of the pulse generator board according to claim 1, characterized in that:

A long hole (19) is perforated on the pulse generator plate (P), and the two side surfaces of the arcuate strip (16a) respectively face the long hole (19).

4. The mounting structure of the pulse generator board according to claim 1, characterized in that:

The fastening part (18) fastens the pulse generator plate (P) and the rotating wall part (9) to form a fastening part (12, 15), and the fastening part (12, 15) is located at A plurality of positions arranged in the circumferential direction of the pulse generator plate (P), and at least one position of the fastening portion (12, 15) and other positions on both sides of the fastening portion (12, 15) adjacent to the one position The respective circumferential intervals (S1, S2) between the fastening portions (12, 15) of the fasteners are different from each other.

5. The installation structure of the pulse generator board according to claim 1, characterized in that:

On the end surface (10) of the rotating wall portion (9), a plurality of recesses (12) arranged in the circumferential direction are formed, and on the pulse generator plate (P) are formed A plurality of bottomed cylindrical bosses (15) in (12), these bosses (15) are fastened on the described pulse generator plate (P) by using the fastening member (18),

The cylindrical portion (15a) of the boss (15) is formed in a special-shaped cylindrical shape, that is, the short diameter (D1) of the cylindrical portion (15a) is along the circumferential direction of the pulse generator plate (P) (A), the long diameter (D2) of the cylindrical portion (15a) is along the radial direction (B) of the pulse generator plate (P).

6. The installation structure of the pulse generator board according to claim 5, characterized in that:

The cylindrical portion (15a) of the boss (15) is formed in an elliptical cylindrical shape.

7. The installation structure of the pulse generator board according to claim 5, characterized in that:

The curvature of the curved portion connected to both ends of the cylindrical portion (15a) of the boss (15) is set smaller on the side of the short diameter (D1) than on the side of the long diameter (D2).

8. The mounting structure of the pulse generator board according to claim 1, characterized in that:

A rib (25) protruding from one end surface side of the pulse generator plate (P) and extending in the circumferential direction is formed on the pulse generator plate (P).

9. The installation structure of the pulse generator board according to claim 8, characterized in that:

The rib (25) protrudes from the end face of the pulse generator plate (P) on the side of the rotating wall portion (9), and a rib receiving groove (26) for accommodating the rib (25) is formed on the rotating wall portion (9) side. on the wall (9).

10. The installation structure of the pulse generator board according to claim 8, characterized in that:

The rib (25) is formed into a ring shape over the entire circumference of the pulse generator plate (P).

11. The installation structure of the pulse generator board according to claim 8, characterized in that:

On the end surface (10) of the rotating wall part (9), a plurality of recesses (12) arranged in the circumferential direction of the end surface (10) are formed, and a plurality of bottomed cylinders are formed on the pulse generator plate shaped boss (15), the boss (15) is accommodated in the plurality of recesses (12) and fastened on the pulse generator plate (P) by the fastening member (18), And, the bosses (15) are connected to each other by the ring-shaped ribs (25), the ring-shaped ribs (25) are located at the rotating position of the pulse generator plate (P). A rib housing groove (26) for housing the ring-shaped rib (25) protrudes from the side end surface of the wall portion (9) and is formed on the end surface (10) of the rotating wall portion (9).

12. The installation structure of the pulse generator board according to claim 8, characterized in that:

The height (H1) of the rib (25) is set to be smaller than the height (H2) of the boss (15), and the depth (h1) of the rib receiving groove (26) is set to be smaller than the height (H2) of the rib receiving groove (26). The depth (h2) of said recess (12) of the boss (15) is small.

13. The installation structure of the pulse generator board according to claim 8, characterized in that:

A through hole (27) is pierced on the half of the pulse generator plate (P) on the side of the crank arm (3).

Claims (14)

1. An installation structure of a pulse generator board, The installation structure of the pulse generator plate is formed by forming on the end surface (10) of the rotating wall part (9) composed of the crank arm (3) and the counterweight (4) of the internal combustion engine crankshaft (C) A keyway (14), a key portion (16) engaged with the keyway (14) is formed on the pulse generator plate (P) overlapping with the end surface (10), and the fastening member (18) is used to place the The pulse generator plate (P) is fastened on said rotating wall part (9), characterized in that, The key portion (16) is constituted by an arcuate strip portion (16a) from the pulse generating The device plate (P) protrudes in an arcuate shape and engages with the keyway (14), and the pair of connecting parts (16b) integrally connects both ends of the arcuate belt-shaped part (16a) to the pulse generator on the board (P). 2. The mounting structure of the pulse generator board according to claim 1, characterized in that: The key groove (14) and the arcuate band (16a) engaged with each other are arranged such that their longitudinal direction is along the radial line of the pulse generator plate (P). 3. The mounting structure of the pulse generator board according to claim 1, characterized in that: The keyway (14) is formed on the end face (10) of the counterweight (4). 4. The mounting structure of the pulse generator board according to claim 1, characterized in that: A long hole (19) is perforated on the pulse generator plate (P), and the two side surfaces of the arcuate strip (16a) respectively face the long hole (19). 5. The installation structure of the pulse generator board according to claim 1, characterized in that: The fastening part (18) fastens the pulse generator plate (P) and the rotating wall part (9) to form a fastening part (12, 15), and the fastening part (12, 15) is located at A plurality of positions arranged in the circumferential direction of the pulse generator plate (P), and at least one position of the fastening portion (12, 15) and other positions on both sides of the fastening portion (12, 15) adjacent to the one position The respective circumferential intervals (S1, S2) between the fastening portions (12, 15) of the fasteners are different from each other. 6. The installation structure of the pulse generator board according to claim 1, characterized in that: On the end surface (10) of the rotating wall portion (9), a plurality of recesses (12) are formed along the circumferential direction of the end surface, and on the pulse generator plate (P) are formed a plurality of bottomed cylindrical bosses (15) in each recess (12), these bosses (15) are fastened on the pulse generator plate (P) by the fastening member (18), The cylindrical portion (15a) of the boss (15) is formed in a special-shaped cylindrical shape, that is, the short diameter (D1) of the cylindrical portion (15a) is along the circumferential direction of the pulse generator plate (P) (A), the long diameter (D2) of the cylindrical portion (15a) is along the radial direction (B) of the pulse generator plate (P). 7. The mounting structure of the pulse generator board according to claim 6, characterized in that: The cylindrical portion (15a) of the boss (15) is formed in an elliptical cylindrical shape. 8. The installation structure of the pulse generator board according to claim 6, characterized in that: The curvature of the curved portion connected to both ends of the cylindrical portion (15a) of the boss (15) is set smaller on the side of the short diameter (D1) than on the side of the long diameter (D2). 9. The installation structure of the pulse generator board according to claim 1, characterized in that: A rib (25) protruding from one end surface side of the pulse generator plate (P) and extending in the circumferential direction is formed on the pulse generator plate (P). 10. The installation structure of the pulse generator board according to claim 9, characterized in that: The rib (25) protrudes from the end face of the pulse generator plate (P) on the side of the rotating wall portion (9), and a rib receiving groove (26) for accommodating the rib (25) is formed on the rotating wall portion (9) side. on the wall (9). 11. The installation structure of the pulse generator board according to claim 9, characterized in that: The rib (25) is formed into a ring shape over the entire circumference of the pulse generator plate (P). 12. The installation structure of the pulse generator board according to claim 9, characterized in that: On the end surface (10) of the rotating wall part (9), a plurality of recesses (12) arranged in the circumferential direction of the end surface (10) are formed, and a plurality of bottomed cylinders are formed on the pulse generator plate shaped boss (15), the boss (15) is accommodated in the plurality of recesses (12) and fastened on the pulse generator plate (P) by the fastening member (18), And, the bosses (15) are connected to each other by the ring-shaped ribs (25), the ring-shaped ribs (25) are located at the rotating position of the pulse generator plate (P). A rib housing groove (26) for housing the ring-shaped rib (25) protrudes from the side end surface of the wall portion (9) and is formed on the end surface (10) of the rotating wall portion (9). 13. The installation structure of the pulse generator board according to claim 9, characterized in that: The height (H1) of the rib (25) is set to be smaller than the height (H2) of the boss (15), and the depth (h1) of the rib receiving groove (26) is set to be smaller than the height (H2) of the rib receiving groove (26). The depth (h2) of said recess (12) of the boss (15) is small. 14. The installation structure of the pulse generator board according to claim 9, characterized in that: A through hole (27) is pierced on the half of the pulse generator plate (P) on the side of the crank arm (3).

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