TW201439428A - Engine - Google Patents

Abstract

An engine comprises a crankcase, a crank rotatably mounted in the crankcase, a starting gear fit to the crankshaft and located outside the crankcase, and a counterweight. The crankcase comprises a first half and a second half mating the first half. The first half and the second half collectively surround and define a crankshaft chamber. The crankshaft comprises an axle extending through the first half and the second half and an eccentric counterweight part extending from the axle and located in the crankshaft chamber. The counterweight is fit to the axle of the crankshaft and located outside the crankcase and between the crankshaft chamber and the starting gear. The counterweight is disposed in a space that was originally not effectively used to correspondingly reduce the length of the cantilever and reduce the influence of bending moment, yet increasing the rotation inertia without resulting in size increase of the crankshaft.

Description

engine

The present invention relates to a power unit, and more particularly to an engine.

The piston of the engine moves up and down through the stroke of compression, ignition and explosion, and drives a crankshaft to generate power. In order to enhance the inertia of the crankshaft rotation, the rotary power is smoother and the vibration is reduced. More eccentric weights are formed on the crankshaft. And increase the inertia, but with the large displacement engine, especially the single-cylinder locomotive engine, the heavier weight is needed to increase the inertia, but directly increase the crankshaft to increase the weight, not only The required configuration space is increased, and the shape of the crankshaft is changed to a non-simple geometric shape, and when the size is increased, the control of the manufacturing precision is more difficult, so that not only the manufacturing difficulty is increased, but also the balance angle is balanced. The error value of the rate becomes larger.

Therefore, the relevant industry also adopts another way to increase the inertia of the crankshaft, that is, additionally adding a generator, a one-way clutch, a pulley, etc. coaxially rotating with the crankshaft in the longitudinal direction of the crankshaft to increase the rotational inertia, even in the said The pulley and the one-way clutch are further provided with at least one auxiliary weight, such as the Republic of China Patent Publication No. 201242805, the announcement No. M430526, etc., but the position of the auxiliary weight is away from the eccentricity of the crankshaft. With the weight, the longer force arm causes the crankshaft to be subjected to a large bending moment, which makes the crankshaft easily deformed or yawed, and the durability of the crankshaft is lowered.

Accordingly, it is an object of the present invention to provide an engine that increases the moment of inertia.

Thus, the engine of the present invention includes a crankcase, a crankshaft rotatably pivoted to the crankcase, a set of actuating gears disposed on the crankshaft and outside the crankcase, and a counterweight.

The crankcase includes a first half and a second half that engages the first half, the first half and the second half cooperating around a crank chamber. The crankshaft includes a shaft portion that passes through the first half body and the second half body, and an eccentric weight portion that extends from the shaft portion and is inside the crank chamber.

The weight is sleeved on the shaft portion of the crankshaft and outside the crankcase, and between the crank chamber of the crankcase and the start gear.

The utility model has the advantages that the weight is disposed in a space that is not effectively utilized in the original engine, and the weight is disposed between the crank chamber and the starting gear, so the length of the cantilever is relatively shortened, and the bending moment is The influence of the crankshaft is reduced, but the yaw amount of the crankshaft is lowered, but the effect of increasing the moment of inertia is not caused, and the size of the crankshaft is not increased.

2‧‧‧Crankcase

21‧‧‧ first half

211‧‧‧ bottom wall

213‧‧‧ protruding parts

212‧‧‧ Ribs

22‧‧‧Second half

221‧‧‧ bottom wall

222‧‧‧ rib wall

23‧‧‧ crank chamber

31‧‧‧First cover

32‧‧‧Second cover

4‧‧‧ crankshaft

41‧‧‧Axis

42‧‧‧Eccentric weights

5‧‧‧Starting gear

61‧‧‧Generator

611‧‧ ‧ inner stator

612‧‧‧Outer rotor

62‧‧‧One-way clutch

63‧‧‧ timing gear

7‧‧‧weight device

71‧‧‧First weights

711‧‧‧ big end

713‧‧‧ Missing slot

712‧‧‧Small end

72‧‧‧Second weights

721‧‧‧ Inner Ring Department

722‧‧‧Outer Rings

723‧‧‧Perforation

73‧‧‧Fixed parts

731‧‧‧First end

732‧‧‧second end

91‧‧‧ Bearing

92‧‧‧ crank

93‧‧‧ Timing chain

94‧‧‧Piston

95‧‧‧ drive gear

The other features and advantages of the present invention will be apparent from the embodiments of the present invention. FIG. 1 is a cross-sectional view illustrating a preferred embodiment of the engine of the present invention; 2 is an exploded perspective view showing a weighting device, a starting gear, a generator and a crankshaft in the preferred embodiment; FIG. 3 is a partially enlarged cross-sectional view of the weighting device; 4 is a side view showing a plurality of vacant grooves of the weight device; and FIG. 5 is a side view showing a first half of the preferred embodiment, and is omitted for convenience of explanation. Some components.

Referring to FIG. 1 and FIG. 2, a preferred embodiment of the engine of the present invention comprises a crankcase 2, a first cover body 31 and a second cover body 32 respectively disposed on two sides of the crankcase 2. Rotatingly disposed on the crankshaft 4 of the crankcase 2, a set of starter gears 5 disposed on the crankshaft 4 and outside the crankcase 2, a set of generators 61 disposed on the crankshaft 4, and a set A one-way clutch 62 on the crankshaft 4, a set of timing gears 63 disposed on the crankshaft 4, and a counterweight device 7.

The crankcase 2 includes a first half 21 and a second half 22 engaged with the first half 21. The first half 21 cooperates with the second half 22 to surround a crank chamber 23 . The first half body 21 and the second half body 22 each have a bottom wall 211, 221, and a rib wall 212, 222 extending from the bottom wall 211, 221, wherein the crank chamber 23 refers to the first half 21 The bottom wall 211, the rib wall 212, the bottom wall 221 of the second half 22, and the rib wall 222 cooperate to surround the defined space. Referring to Figures 1 and 5, the first half 21 of the crankcase 2 has a projection 213 projecting toward the crankshaft 4.

Referring to Figures 1 and 2, the crankshaft 4 includes a first through the first The half body 21, the shaft portion 41 of the second half 22, and the eccentric weight portion 42 extending from the shaft portion 41 and extending in the crank chamber 23, the shaft portion 41 of the crank shaft 4 is pierced The bearing 91 of the bottom wall 211 of the first half body 21 and the bottom wall 221 of the second half body 22 is driven by a piston 94 and a crank 92 to be rotatable relative to the crankcase 2 to generate power.

The starting gear 5 is sleeved on the shaft portion 41 of the crankshaft 4 and outside the crankcase 2. In the embodiment, the starting gear 5 is the first half 21 of the crankshaft 4 and the first cover. 31, and engaged with a starter motor (not shown), and when the engine is not activated, the user can use the electric hair to cause the starter motor to rotate the start gear 5, so that the crankshaft 4 is driven to rotate Then you can start the engine.

The generator 61 includes an inner stator 611 fixed to the first cover 31, and an outer rotor 612 surrounding the inner stator 611 and coaxially rotating with the shaft portion 41 of the crankshaft 4. Similarly, the generator 61 Between the first half 21 of the crankshaft 4 and the first cover 31, and the outer rotor 612 is coaxially rotated with the shaft portion 41 of the crankshaft 4, the moment of inertia of the crankshaft 4 can be increased, and the internal inertia of the crankshaft 4 is increased. When the sub-611 rotates, it can generate electric power for the vehicle to use.

The one-way clutch 62 is disposed on the shaft portion 41 of the crankshaft 4 and is coupled to the start gear 5, and the one-way clutch 62 has the effect of avoiding the reverse rotation of the crankshaft 4, and the structure thereof is in the technical field of the invention. Those with ordinary knowledge can easily understand, so there is no more detail.

The timing gear 63 is sleeved on the shaft portion 41 of the crankshaft 4 and is used to drive a timing chain 93 which is wound around the engine. A camshaft (not shown) is provided for controlling the operation of the valve through the timing gear 63 and the timing chain 93 to bring the amount of rotation of the crankshaft 4 to the camshaft.

Referring to Figures 1, 3 and 4, the weight device 7 is sleeved on the shaft portion 41 of the crankshaft 4 and outside the first half 21 of the crankcase 2, and in the crank chamber 23 of the crankcase 2 Start between the gears 5. Preferably, the weight device 7 is between the timing gear 63 and the start gear 5.

The weight device 7 includes a first weight member 71 disposed on the crankshaft 4 and tightly engaged with the shaft portion 41 of the crankshaft 4, a shaft portion 41 that passes through the crankshaft 4 and is coupled to the first portion. The weight member 71 is detachably fastened to the second weight member 72, and a plurality of fixing members 73 for fixing the first weight member 71 and the second weight member 72.

Referring to Figures 2, 3 and 4, the first weight member 71 has a large end portion 711 surrounding the shaft portion 41 of the crankshaft 4, a shaft portion 41 surrounding the crankshaft 4, and the large end portion 711 faces away from the shaft portion 41. A small end portion 712 extending in the direction of the eccentric weight portion 42 of the crankshaft 4 has a smaller diameter than the large end portion 711. The large end portion 711 of the first weight member 71 has a plurality of notches 713 spaced at equal angles and surrounding the shaft portion 41 of the crankshaft 4, and the cutouts 713 can avoid the protrusion with the first half body 21. The portion 213 (see FIG. 5) creates interference in assembly, and in order to control the imbalance of rotation of the missing slots 713, particularly in an equiangularly spaced configuration, additionally, if designed, in assembly There is no interference problem with the protruding portion 213. The large end portion 711 of the first weight member 71 does not need to form the missing grooves 713, and the effect of increasing the inertia is better.

The second weight member 72 has an inner ring portion 721 fixed to the large end portion 711 of the first weight member 71, and an outer ring portion 722 extending outward from the inner ring portion 721, and is consistently passed through. The inner ring portion 721 has a through hole 723 that is fitted to the first weight member 71. In the present embodiment, the fastening members 73 are bolts, and each of the fastening members 73 has a first end portion 731 and a second end portion 732 facing the eccentric weight portion 42 and the start gear 5 respectively. The first end portion 731 and the second end portions 732 do not protrude from the end surface of the corresponding first weight member 71 or the end surface of the second weight member 72, but the fastening members 73 It can also be a fixed connection method such as a spline or a square pin groove. Moreover, under sufficient conditions, one of the first end portion 731 or the second end portion 732 may not be protruded from the end surface of the first weight member 71 or the second weight. The end face of the member 72 is fixed in a manner.

Referring to Figures 1, 2 and 3, in assembly, the timing gear 63 and the first weight member 71 are sleeved on the shaft portion 41 of the crankshaft 4 and assembled by tight fitting, and then the crankcase is assembled. The first half 21 and the second half 22 of the second body 22 are assembled with the crankshaft 4, particularly because of the missing slots 713 on the first weight member 71, so that the first half 21 of the crankcase 2 is The protruding portion 213 can pass through one of the notches 713, and can be smoothly assembled, and then the second weight member 72, the starting gear 5, and the one-way clutch 62 are further disposed outside the first half 21 of the crankcase 2. The generator 61 and the like are mounted on the shaft portion 41, and the shaft portion 41 of the crankshaft 4 is fitted with a drive gear 95 on the outer side of the second half 22 of the crankcase 2, and is driven by a shifting vehicle. The mechanism is matched, but it can also be assembled in conjunction with a stepless variable speed drive (CVT). Finally, the first cover body 31 and the second cover body 32 are separately covered and locked. The assembly is completed on the first half 21 and the second half 22 of the crankcase 2. In addition, according to the characteristics required by the engine, the second weight member 72 may not need to be installed, and different engine characteristics will be described later.

Since the functions of the timing gear 63, the start gear 5, the one-way clutch 62, and the generator 61 have been summarized as above, and can be easily understood by those of ordinary skill in the art, no further description is made, so when the engine is started, After the crankshaft 4 continues to rotate, the eccentric weight portion 42, the one-way clutch 62, and the outer rotor 612 of the generator 61 rotate coaxially with the crankshaft 4 to increase the inertia of rotation, and the weight device 7 also The shaft portion 41 of the crankshaft 4 rotates coaxially, and the inertia of the rotation is also increased. If the emphasis is on reducing the vibration and running sound of the engine, the weight device 7 is suitable for simultaneously using the first weight member 71 and the second weight member 72 to increase the inertia, and the stability is improved by the plurality of weights, if the acceleration is high. For performance, the counterweight device 7 can use only the first weight member 71 to achieve a balance between the weight and the acceleration.

The weight device 7 uses only the first weight member 71 or both the first weight member 71 and the second weight member 72 between the crank chamber 23 and the start gear 5 . Therefore, compared with the short arm of the generator 61 and the one-way clutch 62, the generated bending moment is also small, so that the influence of the yaw on the shaft portion 41 of the crankshaft 4 is small, and the crankshaft 4 is lifted. Durability.

In summary, in the engine of the present invention, the weight device 7 is disposed between the crank chamber 23 and the start gear 5, except that the space that is not effectively utilized is used to increase the weight, and is also as close as possible. The crank chamber 23 can reduce the yaw effect caused by the bending moment on the crankshaft 4, and can be divided The first weight member 71 and the second weight member 72 that are fixedly attached can be used at the right time according to requirements, thereby improving the variability of the weight, and satisfying the usage habits of different regions and national conditions, so that the present invention can be achieved. purpose.

The above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, that is, the simple equivalent changes and modifications made by the patent application scope and patent specification content of the present invention, All remain within the scope of the invention patent.

2‧‧‧Crankcase

21‧‧‧ first half

211‧‧‧ bottom wall

212‧‧‧ Ribs

213‧‧‧ protruding parts

22‧‧‧Second half

221‧‧‧ bottom wall

222‧‧‧ rib wall

23‧‧‧ crank chamber

31‧‧‧First cover

32‧‧‧Second cover

4‧‧‧ crankshaft

41‧‧‧Axis

42‧‧‧Eccentric weights

5‧‧‧Starting gear

61‧‧‧Generator

611‧‧ ‧ inner stator

612‧‧‧Outer rotor

62‧‧‧One-way clutch

63‧‧‧ timing gear

7‧‧‧weight device

71‧‧‧First weights

72‧‧‧Second weights

73‧‧‧Fixed parts

731‧‧‧First end

732‧‧‧second end

91‧‧‧ Bearing

92‧‧‧ crank

93‧‧‧ Timing chain

95‧‧‧ drive gear

Claims (10)

An engine comprising a crankcase including a first half body and a second half engaged with the first half body, the first half body and the second half body cooperating to surround a crank chamber; a crankshaft rotatably pivoted to the crankcase, the crankshaft including a shaft portion penetrating the first half body and the second half body, and an eccentric weight portion extending from the shaft portion and in the crank chamber a starting gear sleeved on the crankshaft and outside the crankcase; and a counterweight device sleeved on the shaft portion of the crankshaft and outside the crankcase, and in the crank chamber of the crankcase Start between the gears. The engine of claim 1, wherein the weighting device comprises a first weight member disposed on the crankshaft and in tight engagement with a shaft portion of the crankshaft. The engine of claim 2, wherein the first weight member has a large end portion surrounding a shaft portion of the crankshaft, a shaft portion surrounding the crankshaft, and an eccentric portion of the crankshaft away from the crankshaft A small end portion extending in the direction of the weight, the outer diameter of the small end portion being smaller than the outer diameter of the large end portion. The engine of claim 3, wherein the weighting device further comprises a second weight member threaded through the shaft portion of the crankshaft and detachably secured to the first weight member. The engine of claim 4, wherein the second weight member has an inner ring portion fixed to a large end portion of the first weight member, and an outer ring portion extending outward from the inner ring portion And a perforation that consistently passes through the inner ring portion and is fitted to the first weight member. The engine of claim 1, further comprising a first cover body disposed outside the first half of the crankcase, and a second cover body disposed outside the second half of the crankcase. Wherein the weight device is disposed between the first half of the crankshaft and the first cover. The engine of claim 1 further comprising a set of generators disposed on the shaft portion of the crankshaft between the first half of the crankshaft and the first cover, wherein the generator includes a solid An inner stator disposed on the first cover and an outer rotor surrounding the inner stator and rotating coaxially with the shaft portion of the crankshaft. The engine of claim 1, the engine further comprising a set of timing gears disposed on the shaft portion of the crankshaft for driving a timing chain, wherein the counterweight is at the timing gear and starting Between the gears. The engine of claim 3, wherein the large end portion of the first weight member has a plurality of notches that are equiangularly spaced and surround the shaft portion of the crankshaft. The engine of claim 4, wherein the weighting device further comprises a plurality of fastening members that fix the first weight member and the second weight member, each of the fastening members having two faces respectively The gear is activated with an end facing the eccentric weight, and at least one end does not protrude from an end surface of the first weight member or an end surface of the second weight member.