CN1576641A - Balance shaft and engine - Google Patents

Abstract

This engine 1 comprises a crankshaft 4 and the balancer shafts 5a, 5b mounted in parallel with the crank shaft 4. Grooves 20 of at least a half-peripheral length are formed along the circumferential direction on outer peripheral faces at a side opposite to a decentering side of the center of gravity M of the journal parts 11 mounted on weight parts 9, of the balancer shafts 5a, 5b. A depth of the groove 20 formed on the journal part 11 supported by the sliding bearing part (bearing part) 8 to which the lubricant is supplied through a lubricant supply passage 22, is gradually increased from an upstream end 20a in the rotating direction toward the downstream side over at least a quarter peripheral length.

Description

Trunnion shaft and motor

Technical field

The present invention relates to a kind of possess collar formed lubricant oil supply with usefulness groove trunnion shaft and possess the motor of trunnion shaft.

Background technique

Reciprocating engine has the situation that possesses trunnion shaft in order to eliminate the vibration because of the back and forth movement generation of piston.The center of gravity of trunnion shaft and its rotary middle spindle depart from.Be provided with the lubricant oil discharge opening that is used for supplying lubricating oil in the plain besring portion that keeps trunnion shaft.And forming the groove of circumferencial direction at the collar of the trunnion shaft that is supported by this plain besring portion, therefore can keep supplying to and plain besring portion between lubricant oil.As prior art, real fair 7-24691 communique is for example arranged.

Along with the deviation of gravity center center of trunnion shaft, the oil film that easily causes the contact pressure of collar and plain besring portion to become maximum maximum load points is interrupted.For preventing this from occurring, the central position of the trench length of circumferencial direction is located on the position of reverse rotational direction of the direction opposition side position deflection trunnion shaft of being partial to than center of gravity in the cross section with the rotating shaft direct cross of trunnion shaft.

If but above-mentioned formation, the spin balancing axle, and groove is when communicating with the lubricant oil discharge opening, trunnion shaft is flowed into the lubricant oil of groove and is pushed to side that center of gravity is partial to.At this moment, have the oil film that collar destroys lubricant oil, and the situation of conflicting with plain besring portion.

On motor, be provided with quick-fried vibration sensor.Quick-fried vibration sensor detects quick-fried vibration of shaking when motor causes quick-fried shaking.If quick-fried vibration of shaking is detected, then motor is controlled as the post ignition state that has postponed the igniting sequential.Motor can be removed the quick-fried phenomenon of shaking by being controlled so as to the post ignition state.It is more when in this case, quick-fried vibration sensor is installed near cylinder block side and the trunnion shaft.Therefore, when trunnion shaft was located at the cylinder block side, if the collar of trunnion shaft and the plain besring portion of cylinder block clash, then quick-fried vibration sensor just will be mistakened as because of the periodic vibration noise that conflict takes place to be done quick-fried vibration of shaking and detects.Its result, though quick-fried shaking do not taken place, motor also is controlled so as to the post ignition state, thereby reduces output power.

Summary of the invention

Therefore, the invention provides a kind of trunnion shaft with shape that collar and its bearing portion do not conflict with rotating center.And, also provide a kind of by possessing this trunnion shaft, prevent the motor of vibration noise of the level of start delay IGNITION CONTROL.

The crankshaft of trunnion shaft of the present invention and motor is configured abreast.This trunnion shaft has, and center of gravity is from counterweight portion that running shaft departs from and be formed at the collar that is supported by bearing portion of this counterweight portion.In the scope of the outer peripheral surface of collar and counterweight portion center of gravity side opposition side, be formed up to the groove of not a half circumference along circumferencial direction.The degree of depth of groove is in the upstream extremity of the sense of rotation scope through 1/1 circumference, along with increasing gradually near the downstream.

In addition, motor of the present invention possesses the trunnion shaft that disposes abreast with crankshaft.Trunnion shaft has, and center of gravity is from counterweight portion that running shaft departs from and be formed at the collar that is supported by bearing portion of this counterweight portion.Bearing portion is by lubricant oil feed path supplying lubricating oil.In the scope of the center of gravity side opposition side of the outer peripheral surface of collar and counterweight portion, be formed up to the groove of not a half circumference along Zhou Fangxiang.Groove depth from the upstream extremity of sense of rotation through 1/1 circumference, along with increasing gradually near the downstream.

Description of drawings

Fig. 1 represents the perspective view of the trunnion shaft configuration in the motor of one embodiment of the present invention for seeing through circumferential component.

Fig. 2 is the trunnion shaft shown in Figure 1 and the sectional drawing of bracket part.

Fig. 3 is the sectional drawing along the F3-F3 shown in Fig. 2.

Fig. 4 is the schematic representation in the oil pressure path of motor shown in Figure 1.

Fig. 5 is for the revolution of expression motor and be installed on the quick-fried vibration sensor of motor shown in Figure 1 and be installed on the figure that concerns between the maximum output value of quick-fried vibration sensor of available engine.

Embodiment

Referring to figs. 1 through Fig. 4 the motor 1 of one embodiment of the present invention is described.Motor 1 shown in the figure possesses: cylinder block 2, piston 3, crankshaft 4 and trunnion shaft 5a, 5b.Formed the cylinder 6 of one-tenth one row arranged side by side on the cylinder block 2.Piston 3 intercalations and are connected on the crankshaft 4 by connecting rod in each cylinder 6.

Trunnion shaft 5a, 5b as shown in Figure 2, is stored the bracket part 7 that is being arranged at cylinder block 2.On bracket part 7, be provided with plain besring portion 8, as balance support axle 5a, the bearing portion of 5b.Trunnion shaft 5a, 5b clamp along the face of piston 3 movement directions and respectively are provided with 1 in both sides respectively.Trunnion shaft 5a, the running shaft A1 of 5b, the running shaft B of A2 and crankshaft 4 is configured abreast.Trunnion shaft 5a, 5b possesses: counterweight portion 9, axial region 10 and collar 11.

Counterweight portion 9 is will be with running shaft A1, and A2 is the shape that the part of the cylinder at center is excised.The section shape of concrete counterweight portion 9 is shown with dot and dash line in Fig. 3.Therefore, the position deviation of the center of gravity M of counterweight portion 9 trunnion shaft 5a, the running shaft A1 of 5b, A2.Axial region 10 is with trunnion shaft 5a, and the running shaft A1 of 5b, A2 are that the center is installed on the end 9a of counterweight portion 9 one sides, and along running shaft A1, A2 is outstanding to the outside of cylinder block 2.

In addition, as shown in Figure 1, on the end 10a of the axial region of giving prominence to by cylinder block 2 10, toothed belt pulley 12 or gear 13 have been installed.Belt pulley with tooth 12 is connected with the 1st crank belt pulley 14 by the 1st toothed-belt 15.The 1st crank belt pulley 14 is installed in from the outstanding crankshaft 4 of cylinder block 2.

Gear 13 and driven gear 19 engagements that are connected driven belt pulley with tooth 18.Driven belt pulley with tooth 18 is by the 2nd toothed-belt 17 and the 2nd crank belt pulley 16 interlocks.The 2nd crank belt pulley 16 is installed on the crankshaft 4 side by side along direction and the 1st crank belt pulley 14 of running shaft B.

Thus, trunnion shaft 5a, the revolution of 5b and crankshaft 4 rotates synchronously.In the motor 1 of present embodiment, the number of teeth of each belt pulley 12,14,16,18 and the number of teeth of gear 13,19 are set trunnion shaft 5a for, and the revolution of 5b is 2 times of revolution of crankshaft 4.And because of trunnion shaft 5a, 5b should rotate synchronously with crankshaft 4, thus except as above-mentionedly by toothed-belt and belt pulley with tooth with gear is connected, also can be and even take turns grade and be connected by chain.

Collar 11 is along trunnion shaft 5a, and the running shaft A1 of 5b is arranged on the substantial middle portion of counterweight portion 9 on the direction of A2.And as shown in Figure 2, the trunnion shaft 5a by belt pulley with tooth 12 rotation has also formed collar 11 on the part of intersecting with cylinder block 2.Collar 11 is supported by plain besring portion 8.On the outer peripheral surface of collar 11, formed groove 20,21.Be arranged at the groove 20 of the collar 11 of counterweight portion 9, relative equilibrium axle 5a, the running shaft A1 of 5b, A2, with the scope of the opposition side of the off-centered direction of center of gravity M of counterweight portion 9 in become circular shape along circumferencial direction through semi-circumference is microscler.Groove 21 processes that are arranged at the collar 11 of axial region 10 are arranged to toroidal in wholecircle week.

Lubricant oil is supplied with between collar 11 and plain besring portion 8.At trunnion shaft 5a, during the 5b rotation, collar 11 lubricated oil are changed to the state that floats off plain besring portion 8.Lubricant oil is supplied with according to 2 kinds of methods.In the 1st kind of method, lubricant oil is supplied with by the lubricant oil discharge opening 23 at plain besring portion 8 openings from the lubricant oil feed path 22 of the wall 2a inside that is arranged at cylinder block 2 as shown in Figure 2.In the 2nd kind of method, lubricant oil is supplied with by the lubricant oil discharge opening 25 at groove 20 openings of collar 11 from the lubricant oil feed path 24 that is arranged at trunnion shaft 5b inside as shown in Figure 4.

As shown in Figure 3, when lubricant oil when plain besring portion 8 sides are supplied with, the degree of depth of groove 20 of collar 11 that is arranged at counterweight portion 9 from the upstream extremity 20a of sense of rotation through in 1/1 circumference scope, along with increasing gradually near the downstream.

In addition, the quick-fried vibration sensor 26 of the vibration of detection when motor 1 causes quick-fried shaking is installed on the outer surface of cylinder block 2.In motor 1, vibration is detected by quick-fried vibration sensor 26, then carries out the post ignition control of the sequential of plug ignition, thereby eliminates the quick-fried phenomenon of shaking.

The as above trunnion shaft 5a of the motor 1 of She Zhiing, 5b has departed from the center because of center of gravity M, so the collar 11 that is arranged at counterweight portion 9 in plain besring portion 8 with the state rotation of deflection center of gravity M direction.Trunnion shaft 5a, 5b arrow as shown in Figure 1 is mutually to opposite spin.And trunnion shaft 5a, 5b rotate to be center of gravity M summit side and the following consistent equidirectional that arrives of summit side on piston 3 respectively.When lubricant oil during from trunnion shaft 5a that plain besring portion 8 sides are supplied with, trunnion shaft 5a rotation, and the upstream extremity of groove 20 is when arriving the position of lubricant oil discharge opening 23, and lubricant oil flows into grooves 2 from lubricant oil discharge opening 23.

The degree of depth of the groove that is arranged at trunnion shaft 5a 20 of present embodiment through 1/1 circumference and from upstream extremity 20a along with increasing gradually near the downstream.Therefore, the amount of lubricant oil inflow groove 20 increases gradually.Its result, groove 20 also changes slightly, so that raise internal pressure gradually.Because of the pressure of the lubricant oil that flows into groove 20 can rapid change, so collar 11 can not touch the inwall of plain besring portion 8.That is the periodic vibration noise that, can not produce as quick-fried vibration sensor 26 flase drops be quick-fried vibration of shaking.Because of not producing the periodic vibration noise,, can prevent that engine output from reducing so motor 1 can not be controlled so as to the post ignition state from trunnion shaft 5a.

Figure 5 illustrates will be under the condition that does not cause the quick-fried phenomenon of shaking the maximum output value of testing signal of quick-fried vibration sensor during running engine one example of drawing a diagram according to engine revolution.S is installed on the degree of depth that possesses groove 20 value in the quick-fried vibration sensor output of the outer surface of the cylinder block of the motor of upstream extremity 20a existing trunnion shaft jumpy in Fig. 5.And T is the value of quick-fried vibration sensor 26 outputs of cylinder block 2 outer surfaces of motor 1 that is installed on the trunnion shaft 5a of the present embodiment that the degree of depth that possesses groove 20 increases as shown in Figure 3 gradually.

As shown in Figure 5, the trunnion shaft 5a of present embodiment does not produce the vibration that can detect to the level of the quick-fried signal that shakes in the very low field of engine revolution.That is, can give full play to the motor proper property that under the condition that does not cause the quick-fried phenomenon of shaking, turns round.

More than, the situation that has disposed trunnion shaft on the cylinder block of the present invention with the motor of 4 inflators in upright arrangement is that example is illustrated, but trunnion shaft also can be arranged on food tray etc.And,, in the scope that does not break away from purport of the present invention, can suitably change the form of inflator number and motor.

Claims (2)

1. trunnion shaft, dispose abreast with crankshaft, and possess: center of gravity is from counterweight portion that running shaft departs from and be formed at the collar that is supported by bearing portion of described counterweight portion, it is characterized in that,

In the scope of the outer peripheral surface of described collar and center of gravity side opposition side described counterweight portion, be formed up to the groove of not a half circumference along Zhou Fangxiang,

The degree of depth of described groove from the upstream extremity of sense of rotation through 1/1 circumference, along with increasing gradually near the downstream.

2. a motor possesses the trunnion shaft that disposes abreast with crankshaft, and trunnion shaft has, and center of gravity is from counterweight portion that running shaft departs from and be formed at the collar that is supported by bearing portion of described counterweight portion, it is characterized in that,

Described bearing portion is by lubricant oil feed path supplying lubricating oil,

Described trunnion shaft is formed up to the groove of not a half circumference along Zhou Fangxiang in the scope of the center of gravity side opposition side of the outer peripheral surface of described collar and described counterweight portion,

The degree of depth of described groove from the upstream extremity of sense of rotation through 1/1 circumference, along with increasing gradually near the downstream.

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