JP7248567B2 - engine - Google Patents

Description

TECHNICAL FIELD The present invention relates to an engine, and more particularly to an engine in which pulsar plate wind noise is reduced.

A conventional engine includes a rotating shaft, a pulsar plate attached to the rotating shaft, a plurality of protrusions provided on the outer periphery of the pulsar plate at predetermined intervals in the circumferential direction, and a pickup sensor facing the outer periphery of the pulsar plate. There is (for example, see Patent Document 1).

JP 2014-51949 A (see FIG. 1)

<Problem> Wind noise from the pulsar plate may increase.
In the engine disclosed in Patent Literature 1, the wind noise of the pulsar plate may increase when the engine rotates at high speed.

SUMMARY OF THE INVENTION An object of the present invention is to provide an engine in which the wind noise of the pulsar plate is reduced.

The main configuration of the present invention is as follows.
As illustrated in FIG. 3(B), the pulsar plate 7 has a pair of mutually adjacent protrusions 7a and 7b with wind faces 7ae and 7be on one side. ) and (7be), the standing dimension (7af) of one wind face (7ae) from the outer peripheral surface (7de) of the pulsar plate (7) is the outer circumference of the pulsar plate (7) of the other wind face (7be). Formed shorter than the standing dimension (7bf) from the surface (7ca),
As illustrated in FIGS. 1 and 2, the pulsar plate (7) includes a circular substrate (7c) fixed to the rotating shaft (6) and a circular substrate (7c) as illustrated in FIGS. Circular ribs (7d) (7d) are provided adjacent to each other on the outer circumference of the substrate (7c), and the pair of projections (7a) ( 7b) projecting from each other, and an inter-rib gap (7dd) is formed between adjacent arcuate ribs (7d) (7d).

The present invention has the following effects.
<Effect> The wind noise of the balsa plate (7) is alleviated.
As illustrated in FIG. 3(B), when the balsa plate 7 rotates, the wind faces 7ae and 7be of the projections 7a and 7b, which have different standing dimensions 7af and 7bf, Wind noises (7ag) and (7bg) having different phases and amplitudes are generated as illustrated in 4(A) and (B), and these wind noises (7ag) and (7bg) interfere with each other, resulting in the is attenuated to a synthesized sound (7abg) with a small amplitude, and the wind noise is alleviated.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure explaining the oil pump of the engine which concerns on embodiment of this invention, and its peripheral parts, FIG. 1(A) is a side elevation sectional view, FIG. 1(B) is a BB line cross section of FIG. 1(A). FIG. 1(C) is a view taken in the direction of arrow C in FIG. 1(A). 1 is a side elevational cross-sectional view of a pulsar plate and its peripheral parts of an engine according to an embodiment of the present invention; FIG. 3(A) is a perspective view, FIG. 3(B) is a front view, FIG. 3(C) is an enlarged perspective view of a projection (7b), and FIG. FIG. 3(D) is an enlarged perspective view of the projection (7a). FIG. 4(A) is a graph of the waveform of the wind noise (7ag) of the projection (7a), and FIG. 4(B) is the projection ( 7b) is a graph of the waveform of the wind noise (7bg), and FIG. 4C is a graph of the waveform of the synthesized sound (7abg) due to the mutual interference of the two wind noises (7ag) and (7bg). It is a rear view of the transmission device cover of the engine according to the embodiment of the present invention. It is a front view of the transmission device cover of the engine according to the embodiment of the present invention. 1 is a front view of an engine according to an embodiment of the invention; FIG. 8 is a right side view of the engine of FIG. 7; FIG. FIG. 8 is a left side view of the engine of FIG. 7;

1 to 9 are diagrams for explaining an engine according to an embodiment of the present invention. In this embodiment, a water-cooled vertical multi-cylinder diesel engine will be explained.

The outline of this engine is as follows.
As shown in FIG. 8, this engine includes a cylinder block (15), a cylinder head (16) assembled to the upper part of the cylinder block (15), and a cylinder head cover (16) assembled to the upper part of the cylinder head (16). 17), a transmission cover (3a) disposed on the front side of the cylinder block (15) with the installation direction of the crankshaft (1) as the fore-and-aft direction and one of the fore-and-aft directions as the front, and the rear portion of the cylinder block (15). It has a flywheel (20) arranged in the cylinder block (15) and an oil pan (29) assembled to the lower part of the cylinder block (15).

As shown in FIGS. 7 and 8, with the horizontal direction perpendicular to the front-rear direction as the horizontal direction, the intake manifold 21 is mounted on the right side of the cylinder head 16 and the intake manifold 21 is mounted on the right side of the cylinder head 16. An intake throttle (22) assembled to the intake inlet of the engine, a common rail (23) installed on the right side of the cylinder head cover (17), and a fuel supply pump (24) located on the right side of the cylinder block (15). , as shown in FIGS. 7 and 9, an exhaust manifold (25) mounted on the left side of the cylinder head (16) and a supercharger (26) mounted on the exhaust outlet of the exhaust manifold (25). there is

The fuel supply system for this engine is a common rail fuel injection system comprising a fuel supply pump (24) and a common rail (23) shown in FIGS.
The intake device of this engine includes an air cleaner (not shown), an air compressor (26a) of a supercharger (26) shown in FIGS. 7 and 9, an intake throttle (22) shown in FIGS. (21) is provided.
The exhaust system of this engine includes an exhaust manifold (25), an exhaust turbine (26b) of a supercharger (26), and an exhaust treatment device (28) shown in FIGS. The exhaust treatment device (28) accommodates a DOC (not shown) and a DPF (not shown) in an exhaust treatment case (28a). DOC is an abbreviation for Diesel Oxidation Catalyst, and DPF is an abbreviation for Diesel Particulate Filter.

As shown in FIG. 1(A), this engine is assembled with a crankcase 2 and a front portion of the crankcase 2 with the direction of installation of the crankshaft 1 being the front-rear direction and one of the two being the front. a transmission cover (3a), an oil pump case (4a) of an oil pump (4) provided on the front wall (3aa) of the transmission cover (3a), and an oil pump case (4a) inserted into the oil pump case (4a) An oil pump input shaft (4b) and a spline sleeve (4c) fixed to the oil pump input shaft (4b) are provided, and the spline sleeve (4c) is spline-fitted to a rotor (4d) in the oil pump case (4a). are internally fitted.

As shown in FIGS. 1(A) to 1(C), the oil pump case (4a) has an oil guide recess (4ab) on the upper surface of its ceiling wall (4aa), and is condensed inside the transmission cover (3a). As shown in FIGS. 1A and 1B, the engine oil 5 flowing down the inner surface 3ab of the front wall 3aa is guided by the oil guide recess 4ab to the outer circumference of the spline sleeve 4c. It is configured to be guided to

According to the above configuration, as shown in FIGS. 1(A) to 1(C), the engine oil (5) condenses inside the transmission cover (3a) and flows down the inner surface (3ab) of the front wall (3aa). 1(A) and 1(B), the spline sleeve 4c and the rotor are guided to the outer periphery of the spline sleeve 4c by the guidance of the oil guide recess 4ab. (4d) The mating portion has high lubricity.

As shown in FIG. 1(C), when viewed parallel to the central axis (4ba) of the oil pump input shaft (4b) (see FIGS. 1(A) and (B)), the oil guide recess (4ab) is: It is formed in an arcuate shape recessed downward.
According to the above configuration, as shown in FIG. 1(C), even if the engine is tilted to the left or right, the engine oil (5) accumulated in the oil guide recess (4ab) flows left and right from the oil guide recess (4ab). As shown in FIGS. 1(A) and 1(B), it is guided backwards and supplied to the outer circumference of the spline sleeve (4c). is high.

As shown in FIGS. 1(A) and 1(B), the oil pump input shaft (4b) is the crankshaft (1), and the crank output wheel (1a) is attached to the crankshaft (1) behind the spline sleeve (4c). ) is fixed, and the engine oil (5) guided to the outer periphery of the spline sleeve (4c) is supplied to the crank output wheel (1a).
According to the above configuration, as shown in FIGS. 1(A) and 1(B), since the engine oil (5) guided to the outer periphery of the spline sleeve (4c) is supplied to the crank output wheel (1a), the crank output The lubricity of the ring (1a) is also high.

The oil pump 4 shown in FIGS. 1(A) and 1(B) is a trochoid pump, and the oil pump case 4a is cylindrical and protrudes rearward from the front wall 3aa of the transmission cover 3a. and the rear end face is covered with a lid (4e). The rotor (4d) is composed of an inner rotor (4da) and an outer rotor (4db) that meshes with the inner rotor (4da). ) are spline-fitted.

A crank output wheel (1a) shown in FIGS. 1(A) and (B) is a crank gear (3c), and the transmission device (3) including this crank gear (3c) is a timing transmission gear train.
As shown in FIGS. 5 to 7, the transmission device (3) includes a crank gear (3c), a first idle gear (3d) meshed with the crank gear (3c), and a first idle gear (3d). A valve-operating cam gear (3e), a second idle gear (3f), and a third idle gear (3g) meshed with each other; a fuel supply pump input gear (3h) meshed with the second idle gear (3f); It has a PTO input gear (3k) meshed with 3 idle gear (3g).
PTO is an abbreviation for power take-off, which means power take-off.
The PTO input gear (3k) takes out the power of the crankshaft (1) shown in FIG. 8 to the PTO drive device (11).
A hydraulic pump is used for the PTO driving device (11).

As shown in FIG. 7, the engine oil supply path (18) including the oil pump (4) is provided within the case walls of the oil pan (29), the oil pump (4) and the crankcase (2). It has an oil gallery (not shown), and an oil cooler (12) and an oil filter (27) provided in the middle of the oil gallery.
The engine oil in the oil pan (29) is supplied to the sliding parts such as the bearings of the transmission (3) through the oil gallery by the pumping force of the oil pump (4). It is cooled by the cooler (12) and purified by the oil filter (27).
The engine oil (5) that has flowed out from the transmission (3) shown in FIG. 1(A) into the transmission cover (3a) flows through the oil return hole (not shown) from the crankcase (2) of FIG. Return to (29).

This engine comprises a rotating shaft (6) shown in FIG. 2, a pulser plate (7) attached to the rotating shaft (6), and the pulser plate (7) as shown in FIGS. A plurality of protrusions (7a), (7b), and (7h) are provided on the outer periphery at predetermined intervals in the circumferential direction, and a pickup sensor (8) facing the outer periphery of the pulsar plate (7) is provided. The engine speed and crank angle are detected based on the pulse signals formed by detecting the projections (7a), (7b), and (7h) passing through the detection area.
As shown in FIG. 2, the pulsar plate (7) is placed in a transmission cover (3a) that houses the transmission (3), and as shown in FIGS. ) (see FIG. 2) and arc-shaped ribs (7d) (7d) adjacent to each other on the outer periphery of the circular substrate (7c). A pair of protrusions (7a) and (7b) project radially outward from the outer circumferences of both ends of the direction, and a gap (7dd) between the ribs is formed between the arcuate ribs (7d) and (7d) adjacent to each other. .

According to the above configuration, as shown in FIGS. 3(A) and 3(B), when the pulsar plate 7 rotates, the projection 7b and the arcuate rib 7d facing the gap 7dd between the ribs from the upper side of the rotation. A large amount of oil mist in the transmission cover (3a) collides with the wide oil mist collision surface (7bd) consisting of the circumferential end surface of ), and a projection (7a) facing this inter-rib gap (7dd) from the downstream side of rotation And since many wakes (7e) are generated on the downstream side of rotation of the wide wake generation surface (7ad) consisting of the circumferential end faces of the arc-shaped ribs (7d), the stirring action of the wakes (7e) stirs the transmission cover. Diffusion of the oil mist inside (3a) is promoted, and the lubricity of the transmission (3) inside the transmission cover (3a) shown in FIG. 2 is high.

Further, according to the above configuration, as shown in FIGS. 3A and 3B, the circular substrate 7c fixed to the rotating shaft 6 (see FIG. 2) and the outer periphery of the circular substrate 7c Circular ribs (7d) and (7d) adjacent to each other are provided, and a pair of projections (7a) and (7b) protrude radially outward from the outer periphery of both circumferential ends of each circular arc rib (7d). Therefore, compared to the case where the protrusions (7a) and (7b) are directly formed on the outer periphery of the circular substrate (7c), the supporting strength of the protrusions (7a) and (7b) is increased, and the vibration of the protrusions (7a) and (7b) is suppressed. , a pulse signal can be formed with high accuracy.

A rotating shaft (6) shown in FIG. 2 is a valve operating cam shaft (6a). This engine is a four-cycle engine, and while the crankshaft (1) makes two revolutions (720°), which is one combustion cycle, the valve operating camshaft (6a) makes one revolution (360°).
This engine is a four-cylinder engine, and as shown in FIGS. 3(A) and 3(B), the pulsar plate (7) is provided with five projections. There are two arcuate ribs (7d), and the pair of projections (7a) and (7b) are provided radially outward from the outer periphery of both circumferential ends of each arcuate rib (7d). A single projection (7h) protrudes from the middle of the arcuate rib (7d) in the circumferential direction.

As shown in FIGS. 3(A) and 3(B), of the pair of projections (7a) and (7b), the projection (7b) on the downstream side of the circular arc-shaped rib (7d) is the oil mist collision surface (7bd). ) is wide, and the projection (7a) on the upper side of the rotation has a narrow oil mist collision surface (winding surface 7ae).
Starting from the protrusion (7b) with a wide oil mist impingement surface (7bd), on the upper side of the rotation of the pulsar plate (7), a protrusion (7h) in the circumferential direction of the arc-shaped rib (7d), the oil mist impingement surface (wind A projection (7a) with a narrow cut surface (7ae), a projection (7b) with a wide oil mist collision surface (7bd), and a projection (7a) with a narrow oil mist collision surface (air cut surface 7ae) are arranged in this order.
A pickup coil is used for the pickup sensor (8).

As shown in FIG. 3(B), the protrusion (7b) at the starting point and the protrusion (7h) in the circumferential direction of the arc-shaped rib (7d) adjacent to the rotation upper side have a phase angle difference of 10°, and the protrusion (7h) at the starting point ( The protrusions (7a), protrusions (7b), and protrusions (7a) sequentially arranged on the rotation upper side from the protrusion (7h) in the circumferential direction of the arc-shaped rib (7d) adjacent to 7b) on the rotation upper side are The phase angle is shifted by 90° with respect to the one on the downstream side of rotation.
The pickup sensor (8) is electrically connected to an engine ECU (not shown), and generates pulse signals formed by detecting protrusions (7a), (7b), and (7h) passing through the detection area of the pickup sensor (8). , the engine speed and crank angle are detected.
That is, the engine ECU generates a starting point pulse signal generated by the starting point projection (7b), and a projection (7a), a projection (7b), and a projection (7a) arranged sequentially from this projection (7h) on the upper side of rotation. The engine speed is detected based on the number of occurrences and the elapsed time of the measurement pulse signal starting from the starting pulse signal, and the crank angle is detected based on the count of the measurement pulse signal from the starting pulse signal. do.
ECU is an abbreviation for electronic control unit, and a microcomputer is used.
The engine ECU calculates the fuel injection amount from the detected engine speed and crank angle, controls the solenoid valve of the fuel injector (not shown) of the common rail injection device, and injects a predetermined amount at a predetermined timing.

As shown in FIG. 3(B), the diameter (7cb) of the outer peripheral surface (7ca) of the circular substrate (7c) along the inter-rib gap (7dd) is The diameter is smaller than the diameter (7 db).
According to the above configuration, as shown in FIGS. 3(A) and 3(B), the circumferential end surface (7cc) of the circular substrate (7c) facing the inter-rib gap (7dd) from the upper side of the rotation is also the oil mist collision surface (7bd). ), the oil mist in the transmission cover (3a) collides with this circumferential end face (7cc), and the circumferential end face (7cd ) also serves as a wake generation surface (7ad), and a wake (7e) is also generated on the upper rotation side of the circumferential end face (7cd) of this circular substrate (7c), so that the stirring action of the wake (7e) causes transmission. Diffusion of the oil mist inside the device cover (3a) is promoted, and the lubricity of the transmission (3) inside the transmission device cover (3a) shown in FIG. 2 is enhanced.

As shown in FIGS. 3(C) and 3(D), the longitudinal length dimension (7f) of the projections (7a) and (7b) along the axial length direction of the rotating shaft (6) (see FIG. 2) is equal to the projection (7a). ) (7b) is set longer than the circumferential thickness dimension (7g).
According to the above configuration, as shown in FIG. 3(C), the longitudinal length dimension (7f) of the projections (7a) and (7b) is set relatively long, so that the gap between the ribs (7dd) Both the oil mist collision surface (7bd) of the projection (7b) facing from the upper rotation side and the wake generation surface (7ad) of the projection (7a) facing the gap (7dd) between the ribs from the lower rotation side are widened. Collision of oil mist in the device cover (3a) and generation of wake (7e) are promoted, and lubricity of the transmission (3) in the transmission device cover (3a) shown in FIG. 2 is enhanced.

As shown in FIGS. 2, 6 and 7, the transmission cover (3a) has a water passage chamber (3ad) for engine cooling water, and as shown in FIG. It faces the pulsar plate (7) in the transmission cover (3a).
According to the above configuration, the oil mist diffused in the transmission cover (3a) shown in FIG. Hard to deteriorate.

The engine cooling water radiates heat from the radiator (not shown) and passes through the water passage chamber (3ad) before absorbing the heat from the cylinder (not shown) and the cylinder head (16) shown in FIG. ing.
According to the above configuration, the engine oil (5) is cooled by the low-temperature engine cooling water radiated by the radiator, so the cooling efficiency of the engine oil (5) is high.

In this engine, as shown in FIG. 2, the pulsar plate (7) is arranged in a transmission cover (3a) that houses the transmission (3), and the pulser plate (7) is fixed to the rotating shaft (6). and a disk spring (10) sandwiched between the fastener (9) and the pulsar plate (7). The elastic restoring force of the disk spring (10) presses the pulser plate (7). configured to be fixed.
In this engine, a damper space (10a) is provided between the disc spring (10) and the pulser plate (7), and vibration of the pulser plate (7) in the axial direction of the rotating shaft (6) causes the disc spring (10) to move. ) expands and contracts, the engine oil ( 5) and air flow back and forth.

In this engine, as shown in FIG. 2, the vibration of the pulsar plate (7) in the axial direction of the rotating shaft (6) causes the spring force of the disc spring (10) and the engine oil (5) in the damper space (10a). and the damper function of the air, the pulse signal can be formed with high accuracy.

In this engine, as shown in FIG. 3(B), the pulsar plate 7 has a pair of adjacent projections 7a, 7b and wind faces 7ae, 7be on one side thereof. Of the cutting surfaces (7ae) and (7be), the vertical dimension (7af) of one airflow surface (7ae) from the outer peripheral surface (7de) of the pulsar plate (7) is the same as that of the other airflow surface (7be) of the pulser plate (7). ) is formed shorter than the standing dimension (7bf) from the outer peripheral surface (7ca) of

In this engine, as shown in FIG. 3(B), when the pulsar plate 7 rotates, the wind faces 7ae and 7be of the projections 7a and 7b differ in the lengths of the standing dimensions 7af and 7bf. 4(A) and 4(B), the wind noises (7ag) and (7bg) having different phases and amplitudes are generated. ) is attenuated to a low-amplitude synthetic sound (7abg), and the wind noise is reduced.

As shown in FIG. 3(B), the wind surfaces 7ae and 7be of the projections 7a and 7b are out of phase with each other at approximately equal intervals (approximately 90°), and are shown in FIG. As shown in B), these wind noises (7ag) and (7bg) are in opposite phases and attenuate due to mutual interference.

(3)...transmission device (3a)...transmission device cover (3ad)...water passage chamber (3ae)...inner wall (6)...rotating shaft (7)...pulsar plate (7a)...protrusion ( 7ae)... wind face, (7af)... standing dimension, (7b)... projection, (7be)... wind face, (7bf)... standing dimension, (7ca)... outer peripheral surface, (7de)... outer peripheral surface, (7f) .

Claims (6)

A rotating shaft (6), a pulsar plate (7) attached to the rotating shaft (6), and a plurality of protrusions (7a) ( 7b) and a pickup sensor (8) facing the outer circumference of the pulsar plate (7), based on pulse signals formed by detecting projections (7a) and (7b) passing through the detection area of the pickup sensor (8). , in an engine configured to detect engine speed and crank angle,
The pulsar plate 7 has a pair of mutually adjacent projections 7a, 7b and one side of which has wind faces 7ae and 7be. The standing dimension (7af) of (7ae) from the outer peripheral surface (7de) of the pulsar plate (7) is the standing dimension (7bf) of the other wind face (7be) from the outer peripheral surface (7ca) of the pulsar plate (7). formed shorter than
The pulsar plate (7) has a circular substrate (7c) fixed to the rotating shaft (6), and arcuate ribs (7d) (7d) adjacent to each other on the outer circumference of the circular substrate (7c). The pair of protrusions (7a) and (7b) project radially outward from the outer periphery of both circumferential ends of the rib (7d), and the gap between the ribs (7d) (7d) is formed between the arc-shaped ribs (7d) (7d) adjacent to each other. An engine characterized in that (7dd) is formed. An engine as claimed in claim 1, wherein
An engine characterized in that the phase angle of each projection (7a) (7b) is shifted by an equal angle with respect to the one on the downstream side of rotation. An engine according to claim 2,
An engine characterized in that the phase angle deviation of each projection (7a) (7b) is 90°. In the engine according to any one of claims 1 to 3 ,
The pulsar plate (7) is arranged in a transmission cover (3a) which houses the transmission (3),
The longitudinal length dimension (7f) of the protrusions (7a) and (7b) along the axial direction of the rotating shaft (6) is set longer than the circumferential thickness dimension (7g) of the protrusions (7a) and (7b). An engine characterized by: In an engine as claimed in claim 4 ,
A transmission device cover (3a) has a water passage chamber (3ad) for engine cooling water, and an inner wall (3ae) of the water passage chamber (3ad) faces the pulsar plate (7) within the transmission device cover (3a). , an engine characterized by: An engine as claimed in claim 5 ,
1. An engine characterized in that it is constructed such that engine cooling water passes through a water passage chamber (3ad) before heat is radiated by a radiator and heat is absorbed from a cylinder and a cylinder head (16).

Images