JP2005273746A - Automatic transmission - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an automatic transmission in which a hydraulic actuator and a hydraulic circuit accommodated in an actuator are planarly arranged by extendingly providing an actuator case to a dead space and extending the bottom part of an actuator case while disposing a shift and select shaft in a dead space formed in the above of a drive shaft connected to a differential mechanism on the vehicle rear side of a multistage transmission gear mechanism, whereby the height direction of the actuator case is kept low to achieve compactization. <P>SOLUTION: When viewing an automatic transmission from an axial direction, while a shift and select shaft is disposed on the vehicle rear side from a multistage transmission gear mechanism, an extended part which is extended to the vehicle rear side from the shift and select shaft. A hydraulic actuator and a hydraulic circuit are arranged in the extended part. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an automatic transmission, and more particularly to an automatic transmission in which components are compactly laid out in an automatic structure based on a manual transmission.

  Some front engine front drive vehicles (FF vehicles) as vehicles are equipped with an automatic transmission that automatically shifts hydraulically based on a manual transmission. In such an automatic transmission, generally, a multi-stage transmission gear mechanism and a differential mechanism are housed in a transmission case of a manual transmission, and the multi-stage transmission gear mechanism and the differential mechanism are provided. In order to operate by hydraulic pressure, components such as an actuator, an electric oil pump that supplies oil to the actuator, and an accumulator that regulates hydraulic oil supplied to the actuator are newly added to the transmission case.

  That is, as shown in FIGS. 10 and 11, in an automatic transmission 202 that is automated based on a manual transmission, a multi-stage transmission gear mechanism 206 and a differential mechanism 208 are housed and provided in a transmission case 204. Actuator case provided with a hydraulic actuator (not shown) for operating a shift-and-select shaft (not shown) for switching the gear position of the transmission gear mechanism 206 and a hydraulic circuit unit (not shown) for controlling the hydraulic actuator 210 is attached to the upper part of the transmission case 204. In the upper part of the transmission case 204, an accumulator 212 that regulates hydraulic fluid supplied to the hydraulic actuator is attached to the actuator case 210 on the left side of the vehicle and the front side of the vehicle. On the other hand, a drive shaft 214 is connected to the differential mechanism 208. In this case, a dead space S for allowing the drive shaft 214 to pass is formed above the drive shaft 214 at the upper portion of the transmission case 204 and behind the actuator case 210.

2. Description of the Related Art Conventionally, an automatic transmission that is automated based on a manual gear-type transmission is provided with a shift-and-select shaft in a select mechanism, and a piston provided in a hydraulic chamber that moves the shift-and-select shaft in the axial direction in the shift mechanism. In some hydraulic chambers, hydraulic pressure is supplied from an external shift action hydraulic pressure generator through piping.
Some transmissions include an actuator for driving a shift rail disposed in a transmission case, and the actuator is protected by the transmission case.
JP-A-11-201281 Japanese Utility Model Publication No. 5-69448

  However, conventionally, in an automatic transmission that is automated based on a manual transmission, when a hydraulic actuator and a hydraulic circuit unit as newly added components are housed in a common actuator case and arranged on the upper surface of the transmission, There is an inconvenience that the internal structure of the actuator case tends to be complicated and the total height is high.

  Also, if the hydraulic actuator and hydraulic circuit section are divided and mounted separately on the transmission side and the vehicle body side, the structure on the transmission side can be simplified, but the cost increases due to an increase in the number of parts. There was an inconvenience.

  Furthermore, when the accumulator is attached to the top or side of the actuator case, the accumulator is often pseudo-spherical, and a dead space is easily formed around it, making efficient layout difficult and making it difficult to connect with other parts. There was an inconvenience that interference easily occurs.

  Furthermore, in general, since the accumulator is attached to the upper part of the transmission case, when parts for the vehicle are arranged around the automatic transmission, these parts are arranged so as to avoid the accumulator. This necessitates the inconvenience that the layout of each component becomes difficult.

  According to the present invention, a multi-stage transmission gear mechanism and a differential mechanism are provided in the transmission case, and a shift-and-select shaft for switching the gear stage of the multi-stage transmission gear mechanism is provided so as to protrude upward from the transmission case. In an automatic transmission in which an actuator case having a hydraulic actuator for operating a shift-and-select shaft and a hydraulic circuit unit for controlling the hydraulic actuator is attached to the upper part of the transmission case, the automatic transmission is viewed from the axial direction. In this case, the shift and select shaft is disposed on the vehicle rear side with respect to the multi-stage transmission gear mechanism, and the actuator case is provided with an extending portion that extends on the vehicle rear side with respect to the shift and select shaft, The hydraulic actuator and the hydraulic circuit unit are disposed in the extending portion.

  In the automatic transmission according to the present invention, when the automatic transmission is viewed from the axial direction, the shift and select shaft is disposed on the rear side of the vehicle with respect to the multi-stage transmission gear mechanism, and the actuator case is more than the shift and select shaft. A drive shaft connected to the differential mechanism on the vehicle rear side of the multi-stage transmission gear mechanism by providing an extension portion extending on the vehicle rear side and disposing a hydraulic actuator and a hydraulic circuit portion on the extension portion. The shift and select shaft is disposed in a dead space formed above the actuator, and the actuator case is extended in the dead space, so that the bottom surface portion of the actuator case is enlarged, and the hydraulic actuator stored in the actuator case The hydraulic circuit section is arranged in a plane, which reduces the height of the actuator case and reduces the compactness. It is possible to achieve the reduction.

The present invention achieves the object of achieving compactness in an automatic transmission that is automated based on a manual transmission by arranging components in a dead space.
Hereinafter, embodiments of the present invention will be described in detail and specifically with reference to the drawings.

  1 to 9 show an embodiment of the present invention.

  1 and 2, reference numeral 2 denotes an automatic transmission that is connected to a horizontally mounted engine (not shown) mounted on the vehicle, and 4 denotes a transmission case. The transmission case 4 includes an engine side case (light case) 6 connected to an engine arranged on the right side of the vehicle with a fixture (not shown), and the engine side case 6 with a fixture (not shown). An intermediate case (left case) 8 provided continuously and a side case 12 on the left side of the vehicle connected to the intermediate case 8 by a fixture 10 are configured.

  The automatic transmission 2 has a configuration capable of automatically shifting based on a manual transmission. In the transmission case 4 of the automatic transmission 2, a multi-stage transmission gear mechanism 14 disposed on the vehicle front side and a differential mechanism 16 disposed on the vehicle rear side and vehicle lower side are housed and provided. Yes. Connected to the differential mechanism 16 is a drive shaft 18 oriented in the axial direction of the automatic transmission 2 (the vehicle left-right direction).

  In the multi-speed gear mechanism 14, as shown in FIG. 3, an input shaft (main shaft) 20, an output shaft (counter shaft) 22, and a reverse idler shaft 24 are arranged in the axial direction of the automatic transmission 2 (the vehicle left-right direction). Directed and arranged in parallel. Although not shown, each input shaft 20 is provided with each speed input gear (not shown) and a predetermined speed-synchronizing mechanism, and each output shaft 22 has each speed output gear meshed with each speed input gear. A synchronization mechanism for a predetermined shift is provided.

  Further, in the multi-speed gear mechanism 14, as shown in FIG. 3, the first speed / second speed shift shaft 26, the third speed / fourth speed shift shaft 28, and the fifth speed / reverse shift shaft 30 are the shafts of the automatic transmission 2. It is arranged in the direction (vehicle left-right direction). The first speed / second speed shift shaft 26 is provided with a first speed / second speed shift yoke 32 and a first speed / second speed shift fork 34 that engages with a predetermined synchronization mechanism (first speed / second speed synchronization mechanism). ing. The 3-speed / 4-speed shift shaft 28 is provided with a 3-speed / 4-speed shift yoke 36 and a 3-speed / 4-speed shift fork 38 that engages with a predetermined synchronization mechanism (3-speed / 4-speed synchronization mechanism). ing. The 5-speed / reverse shift shaft 30 is provided with a 5-speed / reverse shift yoke 40 and a 5-speed fork 42 that engages with a predetermined synchronization mechanism (5-speed / reverse synchronization mechanism). A reverse lever 44 is connected to the front end side of the 5-speed fork 42. The reverse lever 44 is supported by the lever support portion 46 so as to be swingable so that the distal end side engages with a reverse sleeve (not shown) provided integrally with a reverse idler gear (not shown). ing.

  The multi-speed gear mechanism 14 is operated by a shift mechanism 48 as shown in FIG. The shift mechanism 48 is provided with a shift and select shaft 50 for switching the gear position of the multi-speed gear mechanism 14. The shift and select shaft 50 is provided so as to project upward from the inside of the transmission case 4, and is disposed in the vertical direction (vertical direction) at a position facing the drive shaft 18. The shift and select shaft 50 can be selectively engaged with the first speed / second speed shift yoke 32, the third speed / fourth speed shift yoke 36, and the fifth speed / reverse shift yoke 40 in the transmission case 4. A shift and select lever 52 and an interlock plate 54 connected to the shift and select lever 52 are attached.

  An oil pump unit 56 that is operated by a control means (not shown) is attached to the lower part of the intermediate case 8 of the transmission case 4 as shown in FIG. The oil pump unit 56 is configured by integrating an electric oil pump 58 and a clutch actuator 60. A reservoir tank 62 communicates with the electric oil pump 58 (see FIG. 9).

  In this automatic transmission 2, as shown in FIGS. 1 to 3, the multi-stage transmission gear mechanism 14 is configured to be relatively large when viewed from the axial direction (the vehicle left-right direction), and the differential mechanism 16 is a vehicle. Since it is disposed on the rear side and the vehicle lower side, a dead space S is formed above the drive shaft 18 of the differential mechanism 16 and in the upper part of the transmission case 4.

  Therefore, an actuator case 64 is attached to the dead space S above the transmission case 4. In the actuator case 64, a hydraulic actuator 66 that operates (turns and moves in the axial direction) the shift and select shaft 50 and a hydraulic circuit unit 68 that controls the hydraulic actuator 66 are provided.

  In this case, as shown in FIGS. 1 and 2, when the automatic transmission 2 is viewed from the axial direction (the vehicle left-right direction), the shift-and-select shaft 50 is located on the vehicle rear side relative to the multi-stage transmission gear mechanism 14 on the vehicle front side. In addition, the actuator case 64 is provided with an extending portion 70 extending rearward of the vehicle from the shift and select shaft 50, and a hydraulic actuator 66 and a hydraulic circuit portion 68 are provided in the extending portion 70. To do.

  The hydraulic circuit unit 68 includes first and second shift solenoid valves each having a cylindrical spool as a plurality of solenoid valves that supply and discharge hydraulic oil to and from a hydraulic actuator 64 that is operated by the pressure of oil from the electric oil pump 58. 72 and 74 and a select solenoid valve 76, and the first and second shift solenoid valves 72 and 74 and the select solenoid valve 76 are arranged side by side behind the hydraulic actuator 66.

  The hydraulic circuit section 68 includes an accumulator 78 that regulates hydraulic oil supplied to the hydraulic actuator 66, and the accumulator 78 is mounted on the lower wall of the actuator case 64 (see FIG. 1).

  That is, as shown in FIGS. 5 and 6, the actuator case 64 is composed of an upper actuator case 82 and a lower actuator case 84 which are joined by a plurality of joining bolts 64B via a separator plate 80. A case mounting bolt 88 inserted through three case mounting holes 86 oriented in the vertical direction is fixedly positioned on the vehicle rear side of the shift and select shaft 50 in the dead space S above the transmission case 4.

  A gear shift lever 90 is fixed to the upper end portion of the shift and select shaft 50 by a lever fixing pin 92 as shown in FIG. The gear shift lever 90 includes a shift arm 94 and a select plate 96 that are oriented in a predetermined direction.

  As shown in FIG. 9, the actuator case 64 is connected to the first and second shift actuators 98 and 100 connected to the first and second shift solenoid valves 72 and 74 and the select solenoid valve 76 as the hydraulic actuator 66. A select actuator 102 is provided.

  The first shift solenoid valve 72 is attached to the right side wall 82R on the vehicle right side of the upper actuator case 82 of the actuator case 64, as shown in FIGS.

  As shown in FIG. 7, the first shift actuator 98 is operated by a first shift solenoid valve 72, and is formed on the right side of the vehicle and in a part of the upper actuator case 82 so as to be directed in the left-right direction of the vehicle. The first cylinder 104, a first piston 106 that reciprocates in the left-right direction of the vehicle in the first cylinder 104, a first hydraulic chamber 108 that applies hydraulic pressure to the first piston 106, and the first hydraulic chamber 108 And a first cover 110 for closing.

  2, 4, and 7, the second shift solenoid valve 74 is disposed to face the first shift solenoid valve 72, and the left side wall 82 </ b> L on the vehicle left side of the upper actuator case 82 of the actuator case 64. Is attached.

  As shown in FIG. 7, the second shift actuator 100 is operated by a second shift solenoid valve 74, and is formed on the left side of the vehicle and part of the upper actuator case 82 in the left-right direction of the vehicle. A cylinder 112, a second piston 114 that reciprocates in the left-right direction of the vehicle in the second cylinder 112, a second hydraulic chamber 116 that applies hydraulic pressure to the second piston 114, and the second hydraulic chamber 116 are closed. The second cover 118 is included.

  Between the front end side of the first piston 106 and the front end side of the second piston 114, a front end portion 94A of the shift arm 94 of the gear shift lever 90 fixed to the shift and select shaft 50 is arranged as shown in FIG. It is installed.

  As shown in FIG. 5, the select solenoid valve 76 is attached to the right side wall 84 </ b> R on the vehicle right side of the lower actuator case 84 below the first shift solenoid valve 72.

  As shown in FIG. 8, the select actuator 102 is operated by a select solenoid valve 76, and is a select cylinder 120 formed on the front side of the vehicle and a part of the lower actuator case 84 on the front side of the vehicle and in the vertical direction of the vehicle. And a select piston 122 that reciprocates in the vertical direction of the vehicle in the select cylinder 120, and a select hydraulic chamber (not shown) that applies hydraulic pressure to the select piston 122.

  As shown in FIG. 8, a distal end portion 96A of a select arm 96 of a gear shift lever 90 fixed to the shift and select shaft 50 in the upper actuator case 82 is disposed on the distal end side of the select piston 122. .

  As shown in FIG. 8, a rotation angle detection pin 126 held on a pin receiving portion 124 of the separator plate 80 is provided in contact with the shift arm 94 of the gear shift lever 90.

  As shown in FIGS. 4 and 5, the upper actuator case 82 has a flow rate adjusting solenoid valve 128 attached to the right side wall 82R along with the first shift solenoid valve 72 so as to be directed in the left-right direction of the vehicle. The gear position sensor 130 and the oil temperature sensor 132 are mounted on the upper wall 82U on the rear side of the vehicle with respect to the shift and select shaft 50 and directed upward, and the shift and select shaft 50 on the left side of the vehicle. A select stroke sensor 134 is attached.

  As shown in FIG. 6, an oil discharge port 136 is provided on the left side wall 82 </ b> L on the left side of the upper actuator case 82 on the vehicle rear side of the second shift solenoid valve 74.

Further, as shown in FIG. 8, the lower actuator case 84 is formed with an accumulator attachment hole 138 for opening the lower wall 84L at the end portion on the vehicle rear side and attaching the accumulator 78, as shown in FIG. As shown, on the left side of the vehicle and on the rear side of the vehicle, a pressure adjustment solenoid valve 140 is provided below the second shift solenoid valve 74, and an oil supply port 142 is provided on the vehicle rear side of the pressure adjustment solenoid valve 140. It has been. The lower part of the accumulator 78 is supported by an accumulator support 144 of the transmission case 4 as shown in FIG. As a result, the accumulator 78 is disposed below the lower actuator case 84 and on the surface of the extending portion 70 facing the drive shaft 18.

  Further, as shown in FIGS. 6 and 8, a select urging mechanism 146 is provided between the lower actuator case 84 and the interlock plate 54. The select urging mechanism 146 includes a lower spring receiving portion 148 fixed to the shift and select shaft 50 on the interlock plate 54 side, and a first select spring between the lower spring receiving portion 148 and the lower surface of the lower actuator case 84. 150, an upper spring receiving portion 152 fixed to the shift and select shaft 50 in the first select spring 150 and on the lower actuator case 84 side, and a first portion between the upper spring receiving portion 152 and the lower spring receiving portion 148. 2 select springs 154.

  As shown in FIGS. 1 and 2, a parking mechanism 156 is provided on the upper side of the intermediate case 8 on the vehicle front side of the actuator case 64. The parking mechanism 156 connects a parking shaft 160 that is vertically engaged and engaged with the inhibitor switch 158, a parking lever 162 fixed to the top of the parking shaft 160, and a cable connected to a selector in the vehicle interior. In this way, a connection pin 164 fixed to the parking lever 162 is provided.

  Next, the operation of this embodiment will be described.

  In the automatic transmission 2, the first and second shift solenoid valves 72 and 74 and the select solenoid valve 76 are actuated by the pressure of oil from the electric oil pump 58 in order to change the speed of each gear stage. The second shift actuators 98 and 100 and the select actuator 102 are operated, and the shift operation and the select operation are performed by the rotation and axial movement of the shift and select shaft 50.

  By the way, in this embodiment, when the automatic transmission 2 is viewed from the axial direction, the shift and select shaft 50 is disposed on the rear side of the vehicle with respect to the multi-speed transmission gear mechanism 14, and the actuator case 64 is provided with a shift and select shaft. By providing an extending portion 70 extending rearward of the select shaft 50 and a hydraulic actuator 66 and a hydraulic circuit portion 68 disposed in the extending portion 70, the rear side of the multi-stage transmission gear mechanism 14 is provided. In addition, a shift and select shaft 50 is disposed in a dead space S formed to allow the drive shaft 18 connected to the differential mechanism 16 to pass therethrough, and an actuator case 64 is extended in the dead space S. The lower surface wall 84L of the lower actuator case 84, which is the bottom portion of the actuator case 64, is enlarged, A hydraulic actuator 66 and the hydraulic circuit portion 68 to be housed in 64 planarly disposed, the height direction of the actuator case 64 is kept low, it can be made compact automatic transmission 2.

  The hydraulic circuit section 68 includes solenoid valves 72, 74, and 76 that supply and discharge hydraulic oil to and from the hydraulic actuator 66, and these solenoid valves 72, 74, and 76 are arranged side by side behind the hydraulic actuator 66. As a result, the solenoid valves 72, 74, 76 having cylindrical spools can be arranged side by side on the axis of the hydraulic actuator 66, reducing the dimension of the actuator case 64 in the height direction, and the automatic transmission 2. Can be made compact.

  Furthermore, the hydraulic circuit unit 68 includes an accumulator 78 that regulates hydraulic fluid supplied to the hydraulic actuator 66, and the accumulator 78 is attached to the lower surface wall 84 </ b> L of the lower actuator case 84 that is the lower surface wall of the actuator case 64. The accumulator 78 is disposed in the dead space S above the drive shaft 18 to reduce the height of the automatic transmission 2 for compactness, and the layout of components disposed around the automatic transmission 2 is reduced. Can be easily.

  That is, in this embodiment, the shift and select shaft 50 is arranged in the vertical direction (vertical direction) at the rear portion of the transmission case 4 facing the drive shaft 18, and the upper end side of the shift and select shaft 50 and the rear of the vehicle. Since the actuator case 64 is extended on the side and the accumulator 78 is disposed on the surface of the actuator case 64 facing the drive shaft 18, the newly added components can be efficiently laid out and the structure can be simplified. The cost can be reduced.

  The configuration in which the actuator case is disposed in the dead space above the transmission case can be applied to other transmissions.

It is a left view of an automatic transmission. It is a top view of the automatic transmission by the arrow II of FIG. It is a schematic sectional drawing of the multi-stage transmission gear mechanism of an automatic transmission. It is a top view of an actuator case. It is a partial right view of the actuator case by the arrow V of FIG. It is a left view of the actuator case by the arrow VI of FIG. It is a partially cutaway plan view of an actuator case. It is sectional drawing of an actuator case. It is a control block diagram of an automatic transmission. It is a left view of the automatic transmission in the past. It is a top view of the automatic transmission by the arrow XI of FIG. 11 in the past.

Explanation of symbols

2 automatic transmission 4 transmission case 6 engine case 8 intermediate case 12 side case 14 multi-speed gear mechanism 16 differential mechanism 18 drive shaft 48 shift mechanism 50 shift and select shaft 52 shift and select lever 64 actuator case 66 hydraulic actuator 68 Hydraulic circuit portion 70 Extension portion 72 First shift solenoid valve 74 Second shift solenoid valve 76 Select solenoid valve 78 Accumulator 82 Upper actuator case 84 Lower actuator case 90 Gear shift lever 98 First shift actuator 100 Second shift actuator 102 Select actuator

Claims (3)

  A multi-stage transmission gear mechanism and a differential mechanism are provided in the transmission case, and a shift-and-select shaft for switching the gear stage of the multi-stage transmission gear mechanism is provided so as to protrude upward from the transmission case, and the shift-and-select shaft In an automatic transmission in which an actuator case provided with a hydraulic actuator for operating the hydraulic actuator and a hydraulic circuit unit for controlling the hydraulic actuator is attached to the top of the transmission case, when the automatic transmission is viewed from the axial direction, The shift and select shaft is disposed on the rear side of the vehicle with respect to the multi-stage transmission gear mechanism, and the actuator case is provided with an extending portion that extends on the rear side of the vehicle with respect to the shift and select shaft. The automatic transmission is characterized in that the hydraulic actuator and the hydraulic circuit section are disposed in the automatic transmission.   The hydraulic circuit unit includes a plurality of solenoid valves that supply and discharge hydraulic oil to and from the hydraulic actuator, and the solenoid valves are arranged side by side on the vehicle rear side of the hydraulic actuator. Automatic transmission.   3. The automatic transmission according to claim 1, wherein the hydraulic circuit unit includes an accumulator that regulates hydraulic oil supplied to the hydraulic actuator, and the accumulator is attached to a lower wall of the actuator case. Machine.

Images