JPH076557B2 - Starting device for vehicle transmission - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a starting device in which a fluid coupling, a power cutoff clutch and an oil pump are combined, and more particularly to a starting device suitable for use in a semi-automatic transmission.

[Conventional technology]

Manual transmissions for vehicles require skill to operate the clutch, and it is especially difficult to operate the clutch to operate the pedals.Therefore, avoiding such operational troubles and improving the running performance without requiring skill. Automatic transmissions are widely used to make full use of them.

On the other hand, a semi-automatic transmission that has a relatively low cost and has been developed by automating only the clutch to facilitate starting and shifting. The starting device that should replace the clutch of such a transmission is to combine a fluid coupling and a power cutoff clutch and arrange them in series in the axial direction in the same case (edited by the Automotive Engineering Complete Book Editorial Committee, Automotive Engineering). Complete volume 9 volumes, power transmission device, Sankaido Co., Ltd., December 20, 1981, P.254
(Refer to FIG. 3), they are housed in separate cases and arranged in series in the axial direction.

[Problems to be solved by the invention]

However, the above conventional starting device (hereinafter, starting device A
And ) Has a long axial dimension and is not a starting device that can be arranged in the clutch accommodation space of the conventional manual transmission.

Further, in a starting device using a fluid coupling, when relative rotation (slip) occurs between the pump of the fluid coupling and the turbine, the fluid generates heat in proportion to the slip ratio due to viscous friction of the fluid (oil). Therefore, it is necessary to cool the fluid, but as a means for cooling this fluid, it is known to install an oil pump in the transmission and circulate the fluid output by the oil pump to a cooling mechanism such as an oil cooler. Has been.

As an example in which an oil pump is applied to a transmission having such a fluid coupling, as shown in JP-A-48-14944, between an automatic transmission having a plurality of friction engagement elements and the fluid coupling. A transmission is disclosed in which an oil pump is arranged, the oil pump case is fixed to the transmission case, and the oil pump is operated by the engine rotation transmitted through the case of the fluid coupling. The oil pump having this configuration can circulate the fluid in the fluid coupling and supply the operating oil and the lubricating oil of the friction engagement element to the moving speed change mechanism regardless of the slippage of the fluid coupling. It can be said that the configuration is effective in an automatic transmission that requires the supply of hydraulic oil by an oil pump even when the fluid coupling is not slipping.

However, since the semi-automatic transmission does not have a friction engagement element that requires the supply of hydraulic oil by an oil pump, only when the fluid coupling slips, the fluid is circulated and cooled according to the slip ratio, It is desirable to avoid power loss due to excessive operation of the oil pump.

Then, as a starting device having an oil pump which is rotationally driven according to the slip ratio of the fluid coupling, Japanese Patent Laid-Open No. 4036 / 55-40
As disclosed in Japanese Unexamined Patent Publication (Kokai) No. 0-410, a starter device (hereinafter referred to as a starter) having an oil pump that is mounted between an input element (pump) and an output element (turbine) so as to be rotationally driven according to a rotational speed difference between them. Device B) is disclosed. With this configuration, the fluid can be circulated and cooled according to the slip ratio of the fluid coupling, and the oil pump can be efficiently operated.

However, since the starting device B has a configuration in which the pump, the turbine, and the oil pump are coaxially and serially arranged in the axial direction, the axial dimension increases, and the same problem as the starting device A occurs. Have

If the starting device A and the starting device B are simply combined to construct a starting device for a semi-automatic transmission with an oil pump, for example, as shown in FIG. 1, the input shaft is connected to a fluid coupling case. A configuration is conceivable in which it is connected to the pump, the output shaft is connected to the turbine via the power cut-off clutch, and the oil pump is connected between the input shaft and the output shaft. Even in such a case, the power is transmitted to the output shaft via the oil pump, and the complete cutoff cannot be performed. Therefore, it becomes difficult to switch the gear transmission mechanism connected to the output shaft. Moreover, the oil pump is driven even when the power is cut off, which does not require the circulation of fluid, resulting in power loss.

Therefore, the present invention improves the arrangement position and the connection relationship of the oil pump in the starter device in which the power cut-off clutch is combined with the fluid coupling, and is compact and capable of reducing the power loss. An object of the present invention is to provide a starting device for a vehicle transmission that can completely cut off power.

[Means for solving problems]

In order to achieve the above object, the present invention relates to a vehicle starter having a transmission, and a gear transmission mechanism mechanically connected between the transmission and a wheel, wherein the transmission is a power source. An input shaft connected to the input shaft, an output shaft arranged coaxially with the input shaft, connected to the gear transmission mechanism, a pump connected to the input shaft, and a turbine connected to the output shaft. The pump and the turbine are arranged between the fluid coupling for transmitting power from the input shaft to the output shaft via a fluid and between the fluid coupling and either the input shaft or the output shaft. A power cut-off clutch that transmits and cuts off power from the input shaft to the output shaft by engagement and disengagement; and an oil pump that is drivingly connected between the input shaft and the output shaft and circulates fluid in the fluid coupling,
A case for accommodating the fluid coupling, the power cutoff clutch, and the oil pump, wherein the oil pump is arranged on the radially inner side of the power cutoff clutch, and the input shaft is provided via the power cutoff clutch. Alternatively, the power cut-off clutch is connected to either one of the output shafts, and the power cut-off clutch is disposed on the radially inner side of the fluid coupling.

[Operation and effect of the invention]

In the vehicle transmission starting device of the invention, normally, the power from the input shaft is transmitted to the output shaft through the fluid coupling. At this time, since the oil pump is driven by the relative rotation of the pump and the turbine, it is possible to efficiently circulate and cool the fluid in accordance with the slip ratio of the fluid coupling.

During shifting, the power cut-off clutch is released to cut off power transmission between the input shaft or output shaft and the fluid coupling, and cut off power transmission between the input shaft or output shaft and the oil pump. As a result, power transmission via the oil pump can be prevented and power transmission from the input shaft to the output shaft can be completely cut off, facilitating the switching operation of the gear transmission mechanism connected to the output shaft. You can
It is possible to prevent excessive operation of the oil pump and reduce power loss.

Further, the oil pump, the power cutoff clutch and the fluid coupling are housed in the same case, and the oil pump is arranged on the radially inner side of the power cutoff clutch and the power cutoff clutch is arranged on the radially inner side of the fluid coupling. Since it is installed, the structure can be made compact and the increase in the axial dimension can be suppressed, and the vehicle mountability can be ensured.

〔Example〕

 Next, the present invention will be described based on the embodiments shown in the drawings.

FIG. 2 shows a three-axle type vehicle transmission according to the first embodiment of the present invention, in which a transmission 1, a forward four-speed reverse gear first-speed gear transmission 6, a differential mechanism (not shown), and these are housed. It consists of a transmission case 10.

The transmission device 1 includes a fluid coupling (hereinafter referred to as a coupling) 11
And a power cut-off clutch (hereinafter referred to as clutch) 13 provided on the inner side in the radial direction, and an outer periphery of the coupling. In this embodiment, the engine is provided at the engine (right on the figure, right on the right). Direct coupling clutch 15 and an oil pump provided between the input and output members of the coupling
17 and a servo mechanism 19 for releasing and engaging the clutch 13.

The coupling 11 is connected to the input shaft 101 of the transmission connected to the crankshaft of the engine through the drive plate 102 to form the front half of the case.
1, a rear cover 110, which is an annular plate that is welded to the front cover 111 on the outer periphery to form the latter half of the case, and an annular ring having a substantially L-shaped cross-section, which is circumferentially fixed to the outer portion of the inner wall surface of the rear cover. A pump shell 112, a pump blade 113 provided around an inner wall of the pump shell 112, a turpin blade 114 arranged to face the pump blade, and a turbine shell 115 holding the turbine blade 114 are provided. At the center of the front cover 111, an engine waving large-diameter portion is used as a pilot boss 105 that fits into a pilot hole 104 provided at the center of the end surface of the input shaft 101. The center of the left end is the drive shaft 106 of the oil pump 17 and the middle part is the disc plate holding shaft 107 that slidably supports the disc plate of the direct coupling clutch 15 described later in the axial and rotational directions. A shaft 108 is pierced. Also front cover 1
A cylindrical portion 111C having an annular direct coupling clutch face 111A and an inner peripheral spline 111B formed therein is connected to the outer peripheral portion of the shaft 11 so as to be orthogonal to the axis. The turbine shell 11
Reference numeral 5 is connected to the output shaft 103 of the transmission device via a clutch 13 which is arranged on the inner ring in the radial direction in the substantially same section as the turbine shell 115 in the axial direction.

The clutch 13 is provided with a flange portion 131 extending in the radial direction at the left end of the clutch 13 and slidably supports the hub-shaped portion 116 provided on the inner periphery of the turbine shell 115, and at the right end of the clutch 13. The support wall 132 that is narrowed in the radial direction is welded to the disc plate of the direct coupling clutch 15 described later, and the inner spline is formed on the inner circumference.
A cylindrical clutch plate case 134 in which 133 is formed,
A hub portion 135 spline-fitted to the output shaft 103 of the transmission, a clutch drum portion 137 having an outer peripheral spline 136 formed at a position corresponding to the inner spline 133 of the clutch plate case 134, and the hub portion 135 and drum portion. 13
A clutch disc wheel 139 composed of a disc portion 138 connecting the clutch plate case 134 with the outer periphery of the clutch plate wheel
Clutch plates 141 splined to
The inner periphery of the clutch disc 139 is spline-fitted to the drum portion of the clutch disc wheel 139, and the clutch discs 143 are alternately stacked on the clutch plate 141.

The direct coupling clutch 15 has a plurality of clutch plates 151 spline-fitted to the inner peripheral splines of the cylindrical portion of the front cover 111 on the outer periphery, and an annular direct coupling clutch pressing plate 152 fixed to the outer peripheral portion of the turbine shell 115. A plurality of clutch disc holding arms 153 circumferentially projecting from the pressing plate 152 in the axial direction, and a plurality of clutch disc holding arms 153 whose inner circumference is spline-fitted and which are alternately stacked with the clutch plates 151. A clutch disc 154 and a central hub portion 155 are rotatably supported by a disc plate holding shaft 107 of the central shaft 108 via a metal bearing, and an outer periphery 156 is a damper 157.
The disc plate 158 is engaged with the holding arm 153 via the thrust bearing 160 via a thrust bearing 160 by a spring 159 inserted in the center of the front cover 111.

As the oil pump 17, an internal gear pump is used in this embodiment, and in the clutch disc wheel 139, the clutch plate and the disc portion 138 of the clutch disc wheel 138 are used.
It is provided between and. The oil pump 17 has an outer periphery fixed to the disc plate 158, and an inner periphery loosely fitted to the tip small diameter portion 103B of the output shaft 103 of the transmission through an oil seal 175 and a clutch disc wheel through a thrust bearing 176. Of the casing 170 abutting on the disk portion 138 of the casing 170, an internal gear 172 rotatably fitted in a gear room of the casing 170 in which the engine is provided, and a spline fitting at the tip of the central shaft 108. And the external gear 171 is connected to the oil passage 103A formed at the center of the output shaft 103, and the working oil sucked from the suction port 173 provided in the casing 170 is formed in the disc plate 158 and the disc plate 158. And the front cover 111. The servo mechanism 19 of the clutch 13 is composed of a clutch pedal provided in the driver's seat or a connecting rod 191 connected to a servo mechanism that operates by automatic supply / discharge of intake pipe negative pressure or hydraulic pressure, and a fulcrum 193 around the connecting rod 191. Pressing rod 192 rotated to
A bearing case 194 having a flange 194A engaged with the tip 192A of the second bearing, a bearing 195 fitted in the bearing case, a sliding sleeve 196 fitted in the bearing 195, and an inner peripheral edge of the sliding sleeve 196. Of the clutch spring 197, which is engaged with the outer peripheral edge of the diaphragm spring 197 and presses the clutch 13 via the thrust bearing 198. Disengagement and sliding (semi-clutch) are performed manually or automatically.

The gear transmission 6 has a well-known structure, an output shaft of the transmission is an input shaft, an output shaft 61 arranged in parallel with the input shaft, a dog clutch 62 for switching between first speed and second speed, It has a dog clutch 63 for switching between the third speed and the fourth speed, and a reverse gear not shown.

This transmission operates as follows.

The servo mechanism 19 of the clutch 13 is a connecting rod that is manually or automatically operated.
When 191 operates in the leftward direction in the drawing, the pressing rod 192 rotates counterclockwise around the fulcrum 193 to displace the sliding sleeve 196 in the engine direction via the bearing 195. As a result, the sliding sleeve 196 causes the center of the diaphragm spring 197 to swell to the engine, and the pressing ring 199 connected to the outer periphery of the diaphragm spring 197 is displaced leftward in the drawing. This action releases the multi-plate clutch 13. Further, the release of the pressing force to the clutch by the diaphragm spring 197 releases the pressing force applied to the clutch to the clutch disc case 134, turbine shell 115, and disc plate 158 of the clutch to release the direct clutch 15 as well. It In this state, the clutch 13 cuts off the power, so that the gear transmission 6 can perform a gear shift operation.

When the connecting rod 191 is actuated to the right in the figure manually or automatically, the sliding sleeve 196 is displaced to the left in the figure by the restoring force of the diaphragm spring 197, and the pressing ring 199 is moved.
Is pressed by the engine and the multi-plate clutch 13 is engaged,
The input shaft 101 and the output shaft 103 of the transmission are connected via a coupling 11. At this time, the direct coupling clutch 15 operates as follows. Turbine shell with engagement of clutch 13
When the 115 and the output shaft 103 are connected to each other, when the power transmission by the coupling 11 is performed and the relative rotation between the pump and the turbine is large, a thrust force generated in the turbine shell is generated by this, and the hydraulic pressure discharged from the oil pump 17 is further generated. Then, the direct coupling clutch 15 is released against the force of the diaphragm spring 197. Then, as the relative rotation between the pump and the turbine decreases, the thrust force and the discharge pressure of the oil pump decrease, and the diaphragm spring 197 engages.

When the clutch 13 is released, the oil pump 17 is in a state where the turbine is disconnected from the output shaft and is free to rotate, and the rotation speed is the same as the input shaft (or pump). To do. Further, at this time, power transmission between the input shaft 101 and the output shaft 103 is surely cut off. When the clutch 13 is engaged, the input shaft 101
(Or pump) and the output shaft 103 (or disc plate 158) are rotationally driven according to the rotational speed difference (slip ratio), and the amount of oil corresponding to the slip ratio is discharged. This discharged oil amount is supplied to an oil cooler (not shown) to be cooled and circulated.

FIG. 3 shows a second embodiment of the present invention.

In this embodiment, a direct coupling clutch is not provided, the clutch disc wheel 139 is connected to the pump and is rotatably supported by the output shaft 103, and the clutch plate case 134 is fixed to the rear cover 110.

The oil pump 17 includes a casing 170 fixed to the right side of the disc portion 138 of the clutch disc wheel 139, an internal gear 172 rotatably fitted in a gear room provided in the left side of the casing 170, and an output. An external gear 171 that is spline-fitted to the shaft 103 is provided, and the working oil sucked from the suction port 174 is discharged from the discharge port 173. In this case, when the clutch 13 is released, the transmission between the pump and the input shaft 103 is cut off, so that the pump rotates freely and the oil pump 17 is stopped.

[Brief description of drawings]

FIG. 1 is a skeleton diagram of a transmission device in which an oil pump driven by relative rotation of an input element and an output element is provided between an input element and an output element, and FIG. 2 is a transmission according to a first embodiment of the present invention. FIG. 3 is a sectional view of a transmission for an FF type automobile in which a device and a gear transmission are combined, and FIG. 3 is a sectional view of a transmission device according to a second embodiment of the present invention. In the figure, 1 ... transmission device, 6 ... gear transmission (structure), 11 ...
… Fluid coupling, 13 …… Power cut-off clutch, 17 …… Oil pump, 101 …… Input shaft, 103 …… Output shaft, 110 …… Rear cover (case), 111 …… Front cover (case), 1
13 …… Pump, 114 …… Turbine

Claims (3)

[Claims] 1. A starting device for a vehicle transmission, comprising: a transmission; and a gear speed change mechanism mechanically connected between the transmission and a wheel, wherein the transmission is connected to a power source. An input shaft, an output shaft arranged coaxially with the input shaft, connected to the gear transmission mechanism, a pump connected to the input shaft, and a turbine connected to the output shaft, A fluid coupling that transmits power from the input shaft to the output shaft via a fluid between the pump and the turbine, and is disposed between either the input shaft or the output shaft and the fluid coupling. A power cut-off clutch for transmitting and cutting off power from the input shaft to the output shaft by engagement and disengagement; an oil pump drivingly connected between the input shaft and the output shaft for circulating fluid in the fluid coupling; Fluid coupling, power cutoff clutch and A case accommodating an oil pump, wherein the oil pump is disposed on the radially inner side of the power cutoff clutch, and is connected to either the input shaft or the output shaft via the power cutoff clutch. A starting device for a transmission for a vehicle, characterized in that the power cut-off clutch is arranged on an inner circumferential side in a radial direction of the fluid coupling. 2. The pump is connected to the input shaft via the case, the turbine is connected to the output shaft via the power cutoff clutch, and the oil pump is connected to the input shaft. Along with
The starting device for a vehicle transmission according to claim 1, wherein the starting device is connected to the output shaft via the power cut-off clutch. 3. The pump is connected to the input shaft via the power cut-off clutch and a case, the turbine is connected to the output shaft, and the oil pump is connected to the input shaft via the power cut-off clutch. The starting device for a vehicle transmission according to claim 1, wherein the starting device is connected to a shaft and to the output shaft.