JPH0210846Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a segmented flywheel with low torsional rigidity, and particularly to a technology for reducing sliding frictional heat in the portion that functions as a torque limiter mechanism.

[Background Art] A torque fluctuation absorbing device is provided in a power transmission line of an engine of a vehicle or the like in order to absorb the torque fluctuation. As a torque fluctuation absorbing device, there is a split type flywheel in which a vibration system is constructed by dividing the flywheel into a plurality of flywheels and connecting them with springs (for example, Japanese Patent Publication No. 56-43176, Utility Model Application No. Publication No. 113547 (Sho 59-113547).

The structure, operation, and characteristics of a conventional split flywheel will be explained as follows with reference to FIGS. 4 to 6. That is, the flywheel is divided into a drive side flywheel 21 connected to the crankshaft and a driven side flywheel 22 connected to the transmission side, and both flywheels 21 and 22 extend in the flywheel circumferential direction. Low torsional rigidity spring 2
Connected via 3. Both flywheels 21,
A torque limiter 24 is interposed between the torque limiter 22 and the torque limiter 24, which slips when an abnormally large torque exceeding a set value is applied to release the abnormal torque. The torque limiter 24 usually has a friction material lining 27 on the outer surface of a pair of friction plates 25 and 26.
28, friction plate 25,2
A disc spring 29 is inserted between the linings 27 and 28 to urge the friction plates 25 and 26 away from each other, and the linings 27 and 28 are attached to the driven side flywheel 2.
It consists of a structure imposed on 2.

If such a structure is represented by a vibration model, the fifth
The result will be as shown in the figure. That is, the drive side flywheel 21 and the driven side flywheel 22
The two inertial bodies are connected via a series mechanism of a spring 23 and a torque limiter 24, which constitute a low torsional rigidity spring.

In such a device, fluctuating torque transmitted from the crankshaft to the drive-side flywheel 21 is transmitted to the driven-side flywheel 22 via the spring 23 and the torque limiter 24. At this time, when the transmitted torque is less than the set value _T0 , no slipping occurs in the torque limiter 24, but when the torque exceeds the set value T0, the torque limiter ₂₄
4 causes slippage, i.e. linings 27, 28
A slip occurs between the drive side flywheel 22 and the driven side flywheel 22, and further torque transmission is cut off as shown in FIG.

[Problems to be solved by the invention] However, as mentioned above, in a split flywheel with a torque limiter, when resonance occurs, etc.
If an abnormally large torque acts and causes the torque limiter to slide, the frictional heat will also increase and the torque transmission capacity will decrease. Therefore, even when the vehicle is operating with normal torque, the torque limiter slides, creating a vicious cycle in which the frequency of frictional heat generation increases.

The purpose of this invention is to reduce the generation of frictional heat during sliding while maintaining the function of the torque limiter in a low torsionally rigid split flywheel, and achieve this with a simple structure.
The purpose is to make it possible to achieve smaller size, lighter weight, lower cost, and higher reliability.

[Means for Solving the Problems] The low torsional rigid split type flywheel of the present invention that achieves this objective has a drive side flywheel, an intermediate flywheel, and a driven side flywheel on the same axis, and the drive side flywheel The wheel and the intermediate flywheel are connected via a spring, and the intermediate flywheel and the driven flywheel are connected to each other.A check piece is provided on one side of the intermediate flywheel and the driven flywheel with a spring biased in the flywheel axial direction. and a check piece engagement recess capable of receiving a check piece on the other side, which are connected to each other so as to be engageable and detachable via the check piece.

[Operation] In the low torsional rigidity split type flywheel having the above configuration, during normal operation, the check piece is accommodated and engaged in the check piece engagement recess, and the intermediate flywheel and the driven flywheel rotate as one. . Therefore, the drive side flywheel is connected to the intermediate flywheel and the driven side flywheel via the spring,
The torque fluctuation reduction effect inherent to the split flywheel is effectively achieved.

On the other hand, when the transmitted torque becomes abnormally large, the check piece climbs up the bank of the check piece engagement recess, overcomes the urging force of the spring that urges the check piece, and comes off the check piece engagement groove, causing the intermediate flywheel The flywheel on the driven side rotates relative to the other due to the slip of the check piece to escape the abnormal torque. At this time, the pressing force is only the urging force of the check piece by the spring, so the torque at the time of slipping is small, the sliding friction is also small, and the frictional heat can be reduced.

[Embodiments] Hereinafter, preferred embodiments of the low torsional stiffness split type flywheel according to the present invention will be described with reference to the drawings.

1 to 3 show the structure or characteristics of a flywheel according to an embodiment of the present invention. As shown in the figure, the flywheel includes a drive side flywheel 1, an intermediate flywheel 2, and a driven side flywheel 3, which are arranged on the same axis. A spring mechanism 4 extending in the circumferential direction of the flywheel is interposed between the drive-side flywheel 1 and the intermediate flywheel 2, and a check piece is provided between the intermediate flywheel 2 and the driven-side flywheel 3. A mechanism 5 is interposed.

Among the above, the drive side flywheel 1 is
It is fixed to the crankshaft 6 of the engine with a bolt 10 so that it rotates together. The drive-side flywheel 1 has a drive-side flywheel main body 1a on the outer circumference side connected to a pair of side plates 1.
c and 1d, which are sandwiched from both sides and joined together by rivets 7, and the drive-side flywheel body 1b on the inner peripheral side is fastened together with the side plate 1c to the crankshaft 6 with bolts 10.
A ring gear 8 for a starter is attached to the outer periphery of the drive side flywheel 1 by press fit, shrink fit, etc., or is formed integrally with the drive side flywheel main body 1a on the outer periphery.

The driven flywheel 3 is made up of a driven flywheel main body 3a and a driven plate 3b integrally connected by bolts 9 in order to insert and hold the intermediate flywheel 2 therein. The driven flywheel 3 is rotatably supported by a bearing 11 on the drive flywheel main body 1b on the inner peripheral side of the drive flywheel 1.

The intermediate flywheel 2 is held by the driven flywheel 3. The intermediate flywheel 2 is provided with a hole 12 extending in a direction parallel to the central axis of the flywheel. Piece 1
3 and 14 are provided so as to be movable in the direction parallel to the central axis of the flywheel and retractable into the hole 12. Check pieces 13 and 14 are springs 17
The driven flywheel 3 is biased away from each other in the axial direction of the flywheel.
is slidably pressed against the side of the As shown in FIG. 2A, on the side surface of the driven flywheel 3, there are positions where the check pieces 13 and 14 are pressed when the relative angular displacement between the drive flywheel 1 and the driven flywheel 3 is zero. Concave check piece engaging concave portions 15 and 16 are formed on the sides. Check piece engagement recesses 15, 16
As shown in Figure 2B, the driven plate 1
It is formed by recessing the thickness H of the flywheel body 3b and the thickness of the driven side flywheel body 3a. The spring 17 releases the check piece engagement recesses 15 and 16 when a certain amount of torque is applied to the flywheel.
The strength is set so that the check pieces 13, 14 shrink and disengage from the check piece engagement recesses 15, 16 in response to the reaction force from the check pieces 13, 14 that have climbed up on the bank. That is, as shown in FIG. 3, when a constant torque T ₁ is applied, the drive side flywheel 1 and the driven side flywheel 3 are compressed by a constant thread angle θ ₀ due to the spring mechanism 4, and the check piece is then 13, 14 and check piece engagement recess 15,
16 comes off and the drive side flywheel 1 and driven side flywheel 3 are twisted by more than θ ₀ , and the check pieces 13 and 14 and the side surface of the driven side flywheel 3 slide with low friction, so the transmitted torque becomes T ₂ It is starting to decrease dramatically. The check pieces 13 and 14, the spring 17, and the check piece engaging recesses 15 and 16 constitute the check piece mechanism 5.

Next, the operation of the low torsional rigidity split type flywheel configured as described above will be explained.

During normal operation, when the torque applied to the flywheel is not abnormally large, the reaction force that the check pieces 13 and 14 receive from the banks of the check piece engagement recesses 15 and 16 is small, and the check pieces 13 and 14 biased by the spring 17, 14 is the check piece engagement recess 1
5 and 16, and is housed in the check piece engagement recesses 15 and 16. Therefore, the torque transmitted from the drive side flywheel 1 to the intermediate flywheel 2 via the spring mechanism 4 is transmitted to the driven side flywheel 3 via the check piece mechanism 5 without slipping. Therefore, the torsion angle/torsion torque characteristic is in the range of θ ₀ to -θ ₀ as shown in FIG. 3, and the torque fluctuation absorption of the original split type flywheel is effectively performed.

On the other hand, when the torque applied to the flywheel becomes abnormally large and reaches T ₁ , the relative angular displacement between the drive side flywheel 1 and the intermediate flywheel 2 becomes large and becomes θ ₀ , and the check pieces 13, 14 Climb up on the banks of the check piece engagement recesses 15, 16 and
The spring 17 is bent by the reaction force from the bank, and the check pieces 13 and 14 are disengaged from the check piece engagement recesses 15 and 16. As a result, the relative displacement angle θ of the flywheel becomes larger than ₀ , preventing excessive load from being applied to the spring mechanism 4, and functioning as a torque limiter. Further, since the sliding friction force of the check piece mechanism 5 is only the sliding of the check pieces 13, 14 against the side surface of the driven side flywheel due to the pressing force of the spring 17, the transmitted torque is reduced to _T2 , which is smaller than _T1 . Therefore, the heat generated by sliding friction is small, and the friction material of the torque limiter does not deteriorate as a result of heat generated, unlike the conventional torque limiter.

In the above example, the check pieces 13 and 14 are provided on the intermediate flywheel 2 side, and the check pieces 13 and 14 are provided on the intermediate flywheel 2 side.
Although the check piece engaging recesses 15 and 16 are shown in the figure, this arrangement may be reversed.

[Effect of the invention] Therefore, when using the low torsional rigidity split type flywheel of the present invention, a check piece mechanism is interposed between the intermediate flywheel and the driven side flywheel, so that the torque exceeding the set torque is not generated. When applied to the flywheel, the check piece rides up the bank of the check piece engagement groove, causing slippage between the intermediate flywheel and the driven flywheel, which prevents excessive load from being applied to the spring mechanism, and prevents the torque limiter mechanism from applying excessive load. While maintaining this, the sliding of the check piece mechanism eliminates the conventional problem of friction material deterioration due to sliding frictional heat. Furthermore, since the check piece is biased in the axial direction of the flywheel, the force applied to the check piece does not change due to the centrifugal force applied to the check piece while the flywheel is rotating. θ ₀ ) in the figure does not change, and the operation is stable. Further, since the biasing force of the check piece in the flywheel axial direction becomes constant, frictional heat is kept low, and the durability of the check piece is maintained at a good level.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a low torsional rigid split flywheel according to an embodiment of the present invention, Fig. 2a is a relationship between the driven side flywheel and the check piece engagement groove, and Fig. 2b is a flywheel diagram. A diagram showing the relationship between the relative angular displacement of the wheel and the depth of the check piece engagement groove, Figure 3 is a diagram showing the torsional torque characteristics of the relative angular displacement of the flywheel, and Figure 4 is a sectional view of a conventional two-piece flywheel.
5 is a vibration model diagram of the flywheel shown in FIG. 4, and FIG. 6 is a torsion angle versus torsion torque characteristic diagram of the flywheel shown in FIG. 4. 1... Drive side flywheel, 2... Intermediate flywheel, 3... Drive side flywheel, 4... Spring mechanism, 5... Check piece mechanism, 1
3, 14...Check piece, 15, 16...Check piece engaging recess, 17...Spring.

Claims (1)

[Scope of utility model registration request] A drive side flywheel, an intermediate flywheel, and a driven side flywheel are provided on the same axis, and the drive side flywheel and the intermediate flywheel are connected via a spring, and the intermediate flywheel and the driven side flywheel are connected to each other via a spring. A check piece spring-biased in the flywheel axial direction is provided on one side of the wheel and the driven side flywheel, and a check piece engagement recess capable of receiving the check piece is provided on the other side, and the check piece is engaged via the check piece. A low torsional rigid split flywheel characterized by being removably connected.