JP5276280B2 - Damper mounting structure for hybrid vehicles with limiter - Google Patents

Description

  The present invention relates to a mounting structure for a damper with a wet limiter to be mounted on a hybrid vehicle.

  The hybrid vehicle is provided with a damper with a limiter so as to reduce the impact torque and to slip when a predetermined torque is exceeded. Therefore, the structure is such that the damper and other units (transmission unit) are not damaged due to excessive torque. FIG. 3 is a schematic view showing a power transmission mechanism and a transmission mechanism mounted on the hybrid vehicle.

  (B) is a motor, (c) is another motor, (d) is an engine, (e) is a planetary gear, (f) is an oil pump, and (g) is a damper with a limiter. Sprocket, (H) represents a chain. Therefore, the two motors (b) and (c) are used to run, generate power, regenerate, and start the engine.

  In the case of a general hybrid vehicle, the engine (d) operates during normal operation, but these torques are transmitted to the output shaft (re), and the sprocket (g) and chain (h) are transmitted from the output shaft (re). The axle is driven to rotate through. A damper (b) with a limiter is interposed between the crankshaft (n) extending from the engine (d) and the output shaft (re).

  The damper (a) with a limiter is provided with damper springs (le), (le), and a limiter (e) is provided on the outer periphery. A flywheel (wa) is interposed between the damper (a) with the limiter and the crankshaft (nu), and the outer periphery of the damper (a) with the limiter is screwed to the flywheel (wa). The inner periphery of is screwed to the crankshaft (nu).

  By the way, in a hybrid vehicle, excessive torque may be generated due to fluctuations in travel load or engine load during travel by the engine (d) or engine start by the motor (b). Thus, when excessive torque is generated, the limiter (e) is activated to cause slippage.

  However, the conventional limiter torque has a large variation, and the limiter often does not work even when a predetermined torque is reached. In other words, this is due to the large variation in the friction coefficient (μ) of the friction material provided in the limiter. In particular, the friction coefficient (μ) increases due to the occurrence of rust on the engagement surface of the conventional dry friction material, and accordingly the limiter torque becomes extremely large. As a result, the damper and other units (transmission units) are damaged by excessive torque.

  Therefore, conventionally, it is necessary to design the power transmission mechanism and the speed change mechanism in consideration of the variation of the limiter torque, the outer diameter of the output shaft (re), the damper springs (le), (le), etc. The size of inevitably increases. However, no matter how small the lower limiter torque is, the engine torque and the engine starting torque are required to prevent slipping.

  By the way, when the damper (a) with the limiter is mounted, the hub (f) attached to the engine side and then attached to the center of the damper is fitted to the output shaft (re) and assembled. The damper (a) with limiter is attached to the engine side by first screwing the flywheel (wa) onto the crankshaft (nu) and then attaching the damper (a) with limiter to the flywheel (wa). .

  When the damper with the limiter (A) attached to the engine side is attached to the power transmission mechanism side, misalignment occurs between the output shaft (R) and the hub (figure) provided at the center of the damper due to the effect of component variations. Even if the center is misaligned, some backlash (clearance) is required to spline-fit the hub (f) and output shaft (re). If rattling (clearance) is added to the spline, there is a risk that rattling noise will occur due to vibration. In addition, since the hub (f) and the output shaft (re) are spline-fitted, the chamfering for the guide is necessary for the tip of the output shaft (re) and the hub (f) to improve the assembly. The processing man-hours for processing these are inevitably high.

  Thus, the conventional damper with limiter mounted on the hybrid vehicle has the above-mentioned problems. The problem to be solved by the present invention is this problem, and provides a mounting structure of a damper with a limiter capable of suppressing a variation in the friction coefficient (μ) of the friction material and realizing a stable limiter torque.

  The damper with a limiter targeted by the present invention has a damper and a limiter portion interposed between them to transmit the torque of the crankshaft to the output shaft, and this basic structure is the same as the conventional one. A friction material is provided on the disk outer periphery of the damper or the surface of the outer peripheral plate attached to the disk outer periphery. The disk outer periphery or the outer peripheral plate is sandwiched by a spring force applied by a disc spring or the like. A frictional force is generated between them.

  The damper with limiter has a wet structure and is therefore provided with an outer case and filled with lubricating oil. Here, the outer case is formed by welding a substantially disc-shaped front cover that also serves as a flywheel and a generally cup-shaped rear cover. The disc spring is arranged at the step position provided on the rear cover side so as to be coaxial with the center of the shaft hole of the hub. The disc spring urges the limiter plate with the spring force, and the disc outer periphery provided with friction material on the surface Or a peripheral plate is sandwiched between the front cover.

  Here, the limiter plate meshes with spline teeth provided on the inner periphery of the rear cover so as to rotate together with the outer case. A hub is attached to the center of the damper, and the output shaft is fitted in a shaft hole provided in the hub. On the other hand, a sleeve that extends rearward is provided at the center of the rear cover, and is fitted and supported by a bearing on the power transmission mechanism side. Lubricating oil flows into or out of the outer case through a gap with the output shaft fitted to the hub. There is a flow path. A seal member is attached to the bearing portion that supports the sleeve to prevent the lubricating oil from leaking to the outside.

  By the way, a drive plate is attached to the tip of the crankshaft of the engine, and the outer case of the damper with limiter is provided with a screw hole for connecting with the drive plate by screwing. A damper with a limiter has a hub fitted to the output shaft, and a sleeve extending rearward of the rear cover is fitted to a bearing on the power transmission mechanism side. Finally, the front cover of the outer case and the drive plate are connected by screws. However, in the present invention, a bearing for supporting the sleeve may not be used.

  The drive plate is screwed to the front cover, but a fastening member that is a separate part may be welded to the outer periphery of the front cover, and the drive plate may be connected via the fastening member. In other words, the use of the fastening member, which is a separate component from the front cover, increases the degree of freedom with respect to specification changes.

  The damper with limiter according to the present invention has a wet structure in which the outer case is accommodated in the outer case and the outer case is filled with lubricating oil. Therefore, the friction material of the limiter always has a constant coefficient of friction. That is, there is no rust on the friction material engaging surface, variation in the limiter torque can be suppressed, and the limiter upper limit torque is reduced, so that a relatively small limiter torque can be set. As a result, the shaft diameter constituting the power transmission mechanism and the speed change mechanism is reduced, and the overall dimensions can be reduced.

  And in this invention, the assembly | attachment of the damper with a limiter becomes easy by using a drive plate. That is, one drive plate is attached to the tip of the crankshaft of the engine, the other damper with a limiter has a hub fitted to the output shaft, and a sleeve extends to the rear of the rear cover. It may be supported by being fitted to a bearing on the mechanism side. Finally, the front cover of the outer case and the drive plate are connected by screws. As in the prior art, there is no need for spline fitting between the hub and the output shaft.

  FIG. 1 shows an embodiment of a damper with a limiter according to the present invention, and shows a sectional view. In the figure, 1 is a damper, 2 is a limiter plate, 3 is a disc spring, and 4 is an outer case. The damper 1 has the same basic structure as that used for the torque converter, and includes a plurality of damper springs 5,... Sandwiched between the A plate 6 and the B plate 7. At the same time, it is housed in a spring housing space formed in the A plate 6 and the B plate 7.

  A disk 8 and an intermediate member 9 are interposed between the A plate 6 and the B plate 7. Here, the intermediate member 9 is disposed on the inner diameter side of the disc-shaped disk 8 and connects two damper springs 5 and 5 arranged in pairs in series. If the impact torque acts on the damper, the damper springs 5, 5... Connected in series via the intermediate member 9 are compressed and deformed. Similarly, the damper springs 5, 5... Can be compressed and deformed even with respect to engine torque fluctuations. In this case, the intermediate member 9 rotates with the deformation of the damper springs 5, 5,. Of course, each of the damper springs 5, 5... Moves with compression in a spring accommodating space formed in the A plate 6 and the B plate 7.

  A ring-shaped outer peripheral plate 10 is fixed to the outer periphery of the disk 8 with rivets, and friction materials 11 and 11 are provided on both surfaces of the outer peripheral plate 10. A ring-shaped limiter plate 2 is provided on one side of the outer peripheral plate 10, and the limiter plate 2 is energized by a disc spring 3 interposed between the limiter plate 2 and the outer case 4.

  A hub 13 having a shaft hole 12 is provided at the center, and the hub 13 is fixed to the inner peripheral portion of the A plate 6. The outer case 4 is configured by welding a front cover 14 and a rear cover 15 that also function as a flywheel, and a sleeve 16 extending rearward is formed at the center of the rear cover 15.

  A drive plate 17 is attached to the front cover 14 with screws, and the drive plate 17 is connected to a crankshaft (not shown). Here, a center piece 21 is provided at the center of the front cover 14 so as to fit in the center hole of the crankshaft. Accordingly, the torque of the crankshaft is transmitted to the outer case 4 via the drive plate 17 so that the damper 1 can be rotated. Spline teeth are formed on the outer periphery of the limiter plate 2, and these spline teeth mesh with spline grooves formed on the inner peripheral surface of the outer case.

  Therefore, the limiter plate 2 rotates together with the outer case 4 and is pressed by the disc spring 3 so that the outer peripheral plate 10 sandwiched between the front cover 14 rotates. That is, since the friction plates 11 and 11 are provided on both sides of the outer peripheral plate 10, the outer peripheral plate 10 rotates together with the limiter plate 2 without slipping, and the disk 8 rotates at the same time. The rotational torque of the disk 8 is transmitted to the A plate 6 via the damper springs 5, 5..., And the output shaft fitted in the shaft hole 12 of the hub 13 is rotated.

  Incidentally, a sleeve 16 extends rearward at the center of the rear cover 15, and the sleeve 16 is fitted and supported by a bearing provided on the power transmission mechanism side. Alternatively, the bearing that supports the sleeve 16 may not be used because the front cover 14 is attached to the crankshaft via the drive plate 17. Then, the output shaft 19 can be inserted through the hole of the sleeve 16 and fit into the shaft hole 12 of the hub 13. Here, spline grooves are formed on the inner peripheral surface of the shaft hole of the hub 13, and the spline teeth formed on the outer periphery of the output shaft 19 can mesh with each other.

  FIG. 2 shows a case where the damper with limiter of the present invention is mounted on a power transmission mechanism and a transmission mechanism. The drive plate 17 is positioned and connected to a crankshaft 18. Accordingly, the drive plate 17 and the outer case 4 are rotated by the crankshaft 18, and this rotational torque is transmitted to the disk 8 and transmitted from the A plate 6 to the output shaft 19 fitted in the shaft hole 12 of the hub 13 and rotated. To drive.

  In particular, when the outer case 4 rotates, the lubricating oil filled in the inside is shifted to the outer peripheral side, so that the friction materials 11 and 11 of the outer peripheral plate 10 are immersed in the oil. If oil grooves are formed in the friction materials 11, the lubricating oil that enters the oil grooves prevents the outer peripheral plate 10 from sticking. Further, the lubricant is also applied to the damper 1 to promote expansion / contraction deformation of the damper springs 5, 5... And the rotational movement of the intermediate member 9, so that impact torque can be relaxed and torque fluctuations can be absorbed smoothly.

  By the way, when a large torque acts on the disk 8 of the damper 1, the disk 8 slips and idles. In the damper with a limiter targeted by the present invention, the outer case 4 is filled with lubricating oil, and the limit torque at which the disk 8 idles is substantially constant. That is, the friction material engaging surface is not rusted by the lubricating oil, and a constant friction coefficient (μ) is always maintained.

  The lubricating oil can flow using a gap formed between the output shaft 19 and the sleeve 16 when the output shaft 19 is fitted in the shaft hole 12 of the hub 13. For example, a hole can be provided in the central axis of the output shaft 19 to supply the lubricating oil to the outer case 4, and the lubricating oil that has made a round in the outer case 4 can flow out of the gap between the sleeve 16 and the output shaft 19. A seal member is attached to the bearing portion of the sleeve 16 so that the lubricating oil does not leak outside. In particular, in the case of a hybrid vehicle, when the engine is started, the motor is started and a large torque is generated. If this torque is too large, the limiter operates and the disk 8 is idle. Therefore, an excessive torque load is not generated in the output shaft 19 and other units, and a compact design is possible.

  By the way, when the damper with the limiter is mounted, the drive plate 17 attached to the engine side and the damper with the limiter attached to the power transmission mechanism side are finally connected. That is, the drive plate 17 is positioned and fixed to the tip of the crankshaft 18 with screws. In the damper with limiter, a sleeve 16 extends rearward from the center of the rear cover 15, a seal member 20 is attached to the outer periphery of the sleeve 16, and the output shaft 19 is fitted in the shaft hole 12 of the hub 13.

  Since the damper with limiter is in a free state, the output shaft 19 can be easily fitted into the shaft hole 12 of the hub 13 and is spline-fitted. There is no need to provide a large clearance in the shaft hole 12 of the hub 13, and no backlash is given. Further, guide chamfering is not required at the output shaft tip and the hub. With the sleeve 16 fitted into the bearing and the output shaft 19 fitted into the shaft hole 12 of the hub 13, the drive plate 17 and the front cover 14 are connected by screws.

  In the embodiment, the drive plate 17 and the front cover 14 are directly screwed. In the present invention, a fastening member that is a separate part may be welded to the outer peripheral portion of the front cover 14. Here, the shape of the fastening member is not particularly limited, and for example, a block in which a screw hole is formed, a bolt, or a plate in which a screw hole is formed by bending a plate material is used.

Therefore, although it can be connected to the drive plate 17 via this fastening member, when the specification of the damper with the limiter is changed, a fastening member, which is a separate part, is welded to the front cover at an appropriate position. Even when the drive plate is changed, it is possible to cope with the change by changing the position of the fastening member. On the other hand, for adjusting the inertia, it is possible to adjust the inertia by fixing the fastening member at an appropriate position.
1 and 2 show a structure in which torque is transmitted from the disk to the plate side, but conversely, a structure in which torque is transmitted from the plate to the disk may be employed.

The Example which shows the damper with a limiter concerning this invention. A specific example of a power transmission mechanism equipped with a damper with a limiter. A power transmission mechanism with a conventional damper with a dry limiter.

Explanation of symbols

1 damper 2 limiter plate 3 disc spring 4 outer case 5 damper spring 6 A plate 7 B plate 8 disc 9 intermediate member
10 outer peripheral plate
11 Friction material
12 Shaft hole
13 Hub
14 Front cover
15 Rear cover
16 sleeve
17 Drive plate
18 Crankshaft
19 Output shaft
20 Seal member
21 Centerpiece

Claims (5)

In the mounting structure of a damper with a limiter that constitutes a power transmission mechanism of a hybrid vehicle, a damper having a plurality of damper springs filled with lubricating oil is provided in an outer case constituted by a front cover and a rear cover. A friction material is provided on the outer periphery of the disk, and a limiter plate pressed by a spring is used to sandwich the outer periphery of the disk with the front cover. A hub with a shaft hole is attached to the center of the damper, and the center of the rear cover is The sleeve is extended to the rear, and the sleeve is fitted to and supported by a bearing on the power transmission mechanism side, and an output shaft provided with a hole for supplying lubricating oil to the outer case is fitted in the shaft hole of the hub. , the bearing portion of the sleeve mounting the sealing member so that the lubricating oil does not leak out, and attached to the crank shaft tip of the engine de The mounting structure of the limiter with a damper for hybrid vehicles, characterized in that the set screw the front cover of the outer case to Eve plate. In the mounting structure of a damper with a limiter that constitutes a power transmission mechanism of a hybrid vehicle, a damper having a plurality of damper springs filled with lubricating oil is provided in an outer case constituted by a front cover and a rear cover. A friction material is provided on the outer periphery of the disk, and a limiter plate pressed by a spring is used to sandwich the outer periphery of the disk with the front cover. A hub with a shaft hole is attached to the center of the damper, and the center of the rear cover is The sleeve is extended rearward and the shaft shaft hole of the hub is fitted with an output shaft provided with a hole for supplying lubricating oil to the outer case at the center shaft, so that the lubricating oil does not leak to the bearing portion of the sleeve a sealing member attached, and screwed to the front cover of the outer case to a drive plate attached to the crank shaft tip of the engine The mounting structure of the limiter with a damper for a hybrid vehicle that characterized the door. 3. A damper equipped with a limiter for a hybrid vehicle according to claim 1, wherein an outer peripheral plate provided with a friction material is attached to the outer periphery of the disk, and the outer peripheral plate is sandwiched between a limiter plate and a front cover. Construction. 4. The limiter for a hybrid vehicle according to claim 1, wherein a disc spring is used as the spring, and the disc spring interposed between the rear cover and the limiter plate is substantially concentric with the shaft hole of the hub. Damper mounting structure. 5. A hybrid vehicle with a limiter according to claim 1, wherein a fastening member is fixed to an outer peripheral portion of the front cover, and the drive plate is screwed through the fastening member. Damper mounting structure.

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