JP2008274969A - Damper with limiter for hybrid vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a damper with a limiter, as part of a power transmission mechanism for a hybrid vehicle, for eliminating the deviation of limiter torque. <P>SOLUTION: In an outer case 4 consisting of a front cover 14 and a rear cover 15 connected to each other with a drive plate 17, the damper 1 is provided with a plurality of damper springs 5, 5. An outer periphery plate having a friction material is mounted on the outer periphery of a disc 8 of the damper 1 and clamped by a limiter plate 2 thrust by a disc spring 3. A hub 13 having a shaft hole 12 to which an output shaft 19 is fitted is mounted at the center of the damper 1. Lubricant can be filled in the outer case 4. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a damper with a wet limiter attached to 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, even if the lower limiter torque is reduced by considering the increase of the friction coefficient (μ) due to rust, the engine torque and the engine starting torque are required to prevent slipping.

  On the other hand, there is a problem not only with the friction surface of the limiter (e), but also with the damper, and the damper spring (le) with the damper spring (le), (le),. , (Le) ···························································································································································································· Accompanying this sliding contact, the impact torque and engine torque fluctuations are disturbed and the plate is worn.

  In some cases, a plurality of damper springs (le), (le),... Provided in the damper are arranged in series with two pairs being paired. In this case, the ring-shaped intermediate member formed by projecting the intermediate part connecting the two damper springs (le) and (le) outwards to the damper springs (le), (le),. A shaft is rotatably supported between the sandwiched plates. Therefore, if the damper springs (le), (le) ... are compressed and deformed by receiving impact torque, the intermediate member must rotate along with it, but if the intermediate member and each plate are rusted, The rotation of the intermediate member is obstructed and the impact torque and torque fluctuation cannot be absorbed.

  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 damper with a limiter that can suppress variations in the friction coefficient (μ) of the friction material and can realize a stable limiter torque. In addition, a damper with a limiter is provided, in which a damper spring provided in the damper is smoothly expanded and contracted, and shock torque and torque fluctuation can be absorbed reliably.

  The damper with a limiter of the present invention has a damper and a limiter portion interposed between them when transmitting 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.

  And the damper with a limiter of this invention is made into a wet structure, is provided with the outer case for that purpose, and is filled with lubricating oil inside. 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 placed concentrically with the center of the shaft hole of the hub at the step position provided on the rear cover side. The disc spring is used to urge the limiter plate to apply a spring force and the friction material is provided on the outer surface of the disc. 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. By the way, the front cover and the rear cover are welded together to form an outer case. If a step for positioning is formed in the weld joint, and the front cover and the rear cover are welded in a state aligned with the positioning step, For example, the disc spring is dimensioned so as to have a substantially flat flat ring shape.

  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 extending rearward is provided at the center of the rear cover and is fitted and supported by a bearing on the power transmission mechanism side, and a gap with an output shaft fitted to the hub serves as a flow path for lubricating oil supplied to the outer case. . Alternatively, there may be a flow path through which the lubricating oil flows out from the outer case, and a seal member is attached to the bearing portion that supports the sleeve to prevent the lubricating oil from leaking to the outside. On the other hand, there may be a structure in which the seal member is simply attached without fitting the sleeve to the bearing for support.

  The damper with limiter according to the present invention has a wet structure in which the outer case is housed and the outer case is filled with lubricating oil. Therefore, the friction material of the limiter always has a substantially constant friction coefficient. That is, there is no rust on the friction material engagement 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 diameters constituting the power transmission mechanism and the speed change mechanism are reduced, and the overall dimensions can be reduced.

  A sleeve extends to the rear of the outer case, and this sleeve can be supported by being fitted to a bearing provided on the power transmission mechanism side, and an output shaft is fitted in the shaft hole of the hub. The gap with the shaft can be used as a lubricating oil flow path. For example, lubricating oil is supplied to an outer case from an inflow path provided at the center of the output shaft, and the lubricating oil that has made a round of the outer case can flow out from an outflow path formed in a gap between the output shaft and the sleeve.

  The lubricating oil that has entered the outer case lubricates the friction surface of the limiter as the outer case rotates, so that the limiter torque can be stabilized as described above, and the damper spring of the damper can also be lubricated. Therefore, large impact torque and small torque fluctuation are surely absorbed. On the other hand, since the seal member is attached to the bearing portion of the sleeve, the lubricating oil does not leak out.

  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 a damper with a limiter according to the present invention is mounted on a power transmission mechanism and a transmission mechanism, and a crankshaft 18 is connected to the drive plate 17. 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 present invention, the outer case 4 is filled with lubricating oil, and the limiter 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. 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, the sleeve 16 extends toward the power transmission mechanism, and a seal member 20 is attached to the outer periphery. Therefore, the lubricating oil does not leak out. 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 a damper with a limiter constituting a power transmission mechanism of a hybrid vehicle, a damper having a plurality of damper springs is provided in an outer case constituted by a front cover and a rear cover to which a drive plate is connected, and a disk outer periphery of the damper A friction material is provided on the outer periphery of the disc and the outer periphery of the disc is sandwiched between the front cover and a limiter plate pressed by a spring, and a hub with a shaft hole that fits the output shaft is attached to the center of the damper. The sleeve is extended rearward, and the sleeve is fitted to and supported by a bearing on the power transmission mechanism side to form a lubricating oil flow path into the outer case through a gap between the output shaft and the sleeve, and the sleeve A seal member for preventing the lubricating oil from leaking outside is attached to the bearing portion of the hybrid vehicle. Emitter with the damper. In a damper with a limiter constituting a power transmission mechanism of a hybrid vehicle, a damper having a plurality of damper springs is provided in an outer case constituted by a front cover and a rear cover to which a drive plate is connected, and a disk outer periphery of the damper A friction material is provided on the disc and the disc outer periphery is sandwiched between the front cover with a limiter plate pressed by a spring, and a hub with a shaft hole into which the output shaft fits is attached to the center of the damper. In order to prevent the lubricating oil from leaking to the outer periphery of the sleeve, the sleeve is extended rearward to provide a flow path for the lubricating oil into the outer case through a gap between the output shaft and the sleeve. A damper with a limiter for a hybrid vehicle, wherein a seal member is attached. The damper with a limiter for a hybrid vehicle according to claim 1 or 2, wherein an outer peripheral plate provided with a friction material is attached to an outer periphery of the disk, and the outer peripheral plate is sandwiched between a limiter plate and a front cover. 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. With damper. 2. An inflow passage for lubricating oil supplied into the outer case is formed in a central shaft portion of the output shaft, and a gap between the sleeve and the output shaft is formed as an outflow passage through which the lubricating oil flows out from the outer case. A damper with a limiter for a hybrid vehicle according to claim 2, claim 3, or claim 4.

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