JP2008274968A - Damper with limiter for hybrid vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a damper with a limiter, constituting a power transmission mechanism for a hybrid vehicle, for eliminating the dispersion of limiter torque. <P>SOLUTION: In an outer case 4 consisting of a front cover 14 and a rear cover 15 connected 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. Lubricating oil 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, no matter how small the lower limiter torque is, the engine torque and the engine starting torque are required to prevent slipping.

  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.

  The damper with a limiter of the present invention has a damper and a limiter 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 outer periphery of the damper, and a spring force is urged through a limiter plate attached to the outer periphery of the damper to generate a friction force between the friction material. Here, a disc spring is generally used as the spring, but is not particularly limited.

  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, in the outer case, a front cover that also serves as a flywheel and a rear cover are formed by welding. A hub is attached to the center of the damper, and the output shaft is fitted in a shaft hole provided in the hub. A sleeve is provided at the center of the rear cover, and lubricating oil supplied to the outer case flows through a gap with the output shaft fitted in the hub.

  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.

  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. 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 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.

  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 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.

  By the way, when a large torque acts on the disk 8 of the damper 1, the disk 8 slips and slips. In 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 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 is activated and the disk 8 is idle. Therefore, an excessive torque load is not generated on the output shaft 19 and other units, and a compact design is possible.

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. Schematic of the power transmission mechanism provided with the damper with the conventional dry-type 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 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
21 Centerpiece

Claims (3)

In a damper with a limiter that constitutes 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 plate is provided on the outer periphery of the disc with 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. Is a damper with a limiter for hybrid vehicles, which is filled with lubricating oil. 2. A damper 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. The damper with a limiter for a hybrid vehicle according to claim 1 or 2, 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.

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