JPH0327790B2 - - Google Patents

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to an automatic transmission comprising a torque converter, a transmission, and a hydraulic control device for controlling the torque converter and the transmission. The present invention relates to an automatic transmission equipped with a cabana oil pressure generating means that generates control oil pressure according to speed.

[Prior Art] Conventionally, in automatic transmissions used in vehicles such as automobiles, a hydraulic control device controls a torque converter and a transmission. Governor hydraulic pressure generating means is provided to generate control hydraulic pressure depending on the speed. An example of an automatic transmission equipped with such a governor oil pressure generating means is an automatic transmission described in Japanese Patent Application Laid-Open No. 57-200758.

As shown in FIG. 1, this automatic transmission 200
is a torque converter 201 to which the engine output torque is input, and the output torque of this torque converter 201 is input to the output shaft 202 of the torque converter.
(which also serves as an input shaft of a gear transmission 203, which will be described later). The torque converter 201 is housed in the torque converter case 204, and the gear transmission 203 is housed in the torque converter case 204.
Torque converter case 2 integrally connected to 4
It is housed in 05.

The output torque of the gear transmission 203 is transmitted to a differential gear 208 via an output shaft 206 of the gear transmission and a reduction gear 207. Output shaft 202 of torque converter 201
and the output shaft 206 of the gear transmission 203 are disposed coaxially.

A governor room 209 is provided integrally with the torque converter case 204 on the gear transmission 203 side of the torque converter case 204.
10 are arranged. Governor hydraulic pressure generating means 21
0 includes a cylindrical body 212 rotatably supported by a holding part 211 attached to a torque converter case 204, and this cylindrical body 2.
Governor weight 213 is attached to the side end of No. 12 torque converter 201 and operates according to the rotation speed.
The operation of the governor weight 213 causes the valve spool 214 to slide in the hole of the cylindrical body 212 and the gear transmission 203 which is attached to the end of the cylindrical body 212 on the gear transmission 203 side.
The rotation of the ring gear 216 of the planetary gear set 215 in FIG. 3 is transmitted to the drive gear 217. The ring gear 216 is the output shaft 206
is fitted with a spline.

According to the governor oil pressure generating means 210, the valve spool 214 operates in accordance with the rotation of the ring gear 216, that is, the rotation of the output shaft 206 of the gear transmission 203, so that the output shaft 2
The governor pressure is generated according to the rotation speed of 06.

[Problems to be Solved by the Invention] By the way, the valve spool 214 of the governor hydraulic pressure generating means 210 slides much more frequently due to acceleration and deceleration of the vehicle compared to the valve spools of other control valves in the hydraulic control circuit. Therefore, there is a high possibility that valve stuck will occur. Therefore,
It is necessary to improve maintenance such as inspection and replacement of the governor hydraulic pressure generating means 210.

However, in the conventional governor oil pressure generating means 210 described above, the governor room 209 is connected to the torque converter case 204, the transmission case 205, and the planetary gear set 215.
drive gear 2 as well as surrounded by
17 is attached to the cylindrical body 212 by suitable fixing means such as a snap spring.
Therefore, when inspecting or replacing the governor oil pressure generating means 210, it is necessary to remove the transmission case 205 from the torque converter case 204 and disassemble the gear transmission 203. Therefore, the governor hydraulic pressure generating means 21
It took a lot of time to inspect and replace the 0, and maintenance could not be easily performed.

Also, it is formed integrally with the ring gear 216,
When the gear 218 that meshes with the drive gear 217 rotates to drive the drive gear 217, a radially outward force acts on the drive gear 217. However, in the conventional governor hydraulic pressure generating means, the drive gear 217 is simply supported by the cylindrical body 212 and is not supported by other members such as a case.
The radially outer force acting on the cylindrical body 2
12, and the force also acts on the sliding surface between the cylindrical body 212 and the holding part 211. As a result, the rotational force of the cylindrical body 212 and the radial force are applied to the sliding surface, which may cause uneven wear.

The present invention has been made in view of these problems, and an object of the present invention is to provide an automatic transmission in which the governor oil pressure generating means can be easily inspected and replaced.

Another object of the present invention is to provide an automatic transmission that can prevent uneven wear from occurring on the sliding surfaces of a cylindrical body and its holding portion.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides an automatic transmission comprising a torque converter, a transmission, and a hydraulic control device for controlling the torque converter and the transmission. In the machine, the hydraulic control device includes a governor hydraulic pressure generating means for outputting a rotational speed signal, and the governor hydraulic pressure generating means has one end protruding outside the case and fixed to the case, and the other end protruding into the case. a cylindrical adapter arranged parallel to the output shaft of the transmission, rotatably supported in the inner circumferential hole of the adapter, one end protruding outside the case, and the other end a governor shaft protruding into the case; a governor weight attached to one end of the governor shaft that operates in accordance with the rotational speed; and a valve spool that slides into a center hole of the governor shaft by the operation of the governor weight. a cover that is attached to the case to cover the governor weight and to position the governor weight in the axial direction; and a cover that is rotatably supported by the case by a bearing independently of the governor shaft and is positioned in the axial direction by the adapter. and a spur gear governor driven gear to which the rotation of the output shaft is transmitted, the other end of the governor shaft being aligned with the axis of the governor shaft and the axis of the governor driven gear in a rotating direction. It is characterized in that it is engaged so as to be integrally rotatable with and removably engaged with in the axial direction.

[Operation and Effects of the Invention] According to the automatic transmission of the present invention configured as described above, the governor hydraulic pressure generating means has one end protruding outside the case and fixed to the case, and the other end inside the case. a protruding cylindrical adapter; a cylindrical adapter disposed parallel to the output shaft of the transmission; rotatably supported in the inner peripheral hole of the adapter; one end protruding outside the case; the other end a governor shaft that protrudes into the case; a governor weight that is attached to one end of the governor shaft and operates according to the rotational speed; and a valve spool that slides into the center hole of the governor shaft by the operation of the governor weight. a cover that is attached to the case and covers the governor weight and positions the governor weight in the axial direction; and a cover that is rotatably supported by the case by a bearing independently of the governor shaft and is axially supported by the adapter. a governor driven gear that is a spur gear that is positioned and transmits the rotation of the output shaft, and the other end of the governor shaft is connected to the governor driven gear so that the axis of the governor shaft and the axis of the governor driven gear coincide with each other. Since the governor shaft and the valve spool can be removed from the outside of the case, the governor shaft and the valve spool can be removed from the outside of the case. In that case, since the governor driven gear is radially supported by the case via the bearing, the governor driven gear remains held in the case even if only the governor shaft and valve spool are removed. At this time, since the governor driven gear is positioned in the axial direction by the adapter, the axial movement of the governor driven gear is restricted, so that the governor driven gear does not come off in the axial direction. Therefore, the governor hydraulic pressure generating means can be inspected and replaced very easily without removing the transmission case from the torque converter case and disassembling the gear transmission as in the conventional case.

In addition, since the governor driven gear is rotatably supported in the case by a bearing and independently of the governor shaft, the radial force acting on the governor driven gear is received by the bearing that supports the governor driven gear, and the governor shaft That force has no effect on. Therefore, since only the rotational force of the governor shaft is applied to the governor shaft support portion of the case, uneven wear does not occur on the sliding surface between the case and the governor shaft.

[Examples] Examples of the present invention will be described below with reference to the drawings.

FIGS. 2 and 3 are diagrams showing an embodiment of an automatic transmission according to the present invention. In addition, in the conventional automatic transmission mentioned above, the torque converter output shaft and the output shaft of the gear transmission are arranged on the same axis, but in this embodiment, both output shafts are arranged side by side. This is a type of automatic transmission. However, in the automatic transmission of the type of this embodiment as well, both output shafts are connected via a gear transmission equipped with a planetary gear mechanism, as in the previous embodiment. Since an automatic transmission of the type in which both output shafts are arranged in parallel and connected via such a gear transmission is also conventionally known, FIGS. 2 and 3 relate to the automatic transmission of the present invention. Only parts are shown and other parts are omitted.

As shown in FIG. 2, in the automatic transmission 100 of this embodiment, the first shaft 1, which is the output shaft of the torque converter (which also serves as the input shaft of the gear transmission), and the output shaft of the gear transmission, A certain second axis 2
are arranged parallel to each other. These first and second shafts 1 and 2 are connected by a conventionally known gear transmission using, for example, a planetary gear mechanism. Further, a third shaft 3 is arranged parallel to the first and second shafts 1 and 2, and as shown in FIG. 3, this third shaft 3 serves as the rotation center axis of the differential 7. ing.

As is clear from FIG. 3, the second shaft 2 is rotatably supported by the automatic transmission case 8 via a bearing 9, and the front part 10 of the second shaft 2 is supported by a pair of thrust bearings 11 for automatic transmission. Differential drive gear 1 of output section 5 in machine 100
2 is rotatably fitted on the outside. This differential drive gear 12 is meshed with the large input gear of the differential 7. Further, at the rear of the differential drive gear 12, a governor drive gear 14 made of a spur gear is fixed in a gap between it and a parking gear 13 fixed to the rear end by press fitting, welding, spline fitting, etc. There is. Although not shown, the output section 5 is connected to the second shaft 2 via a forward/reverse switching mechanism or a speed reduction mechanism, such as a planetary gear mechanism, as in the conventional case.

In the vicinity of the output section 5, a governor oil pressure generating means consisting of a governor valve 6 is arranged. The governor valve 6 includes a governor shaft 4 which is a rotary pipe-shaped body provided with an input port 61, an output port 62, and a drain port 63 for hydraulic oil, and a governor weight with a return spring 15 installed at one end of the governor shaft 4. 16, and a spool 18 that slides into the governor shaft 4 with the governor weight 16 pressed against one end 17, and the spool 18 is provided with a land 181 and a land 182 from the tip side (right side in the figure), The oil chamber 64 between the land 181 and the land 182 communicates with the input port 61, the output port 62, and the drain port 63, and the oil chamber 65 behind the land 182 is provided with oil through a hole 66 penetrating the inside of the land 182. It is in contact with room 64. Also, the governor valve 6
A flanged cylindrical adapter 20 is fixed to the case 8 with bolts so that the governor shaft 4 is parallel to the second shaft 2 and one end 19 provided with the governor weight 16 protrudes outside the case 8. It is rotatably supported in an internal hole 21 of. Also, one end side 19 has a cover 22 attached to the case 8.
Therefore, the governor weight is 16
axial movement is restricted. That is, the cover 22 positions the governor weight 16 in the axial direction.

The governor driven gear 23 that meshes with the governor drive gear 14 has a divided structure from the governor valve 6, and is a cylindrical body provided with a flange 25 on the outside of which a spur gear 24 is formed. 26 is rotatably supported in a hole 27 provided in the case 8 via a bearing 28, and the inner hole 2
9 is coupled to and supported across the width across the other end 30 of the governor shaft 16 of the governor valve, as shown in the perspective view of FIG. While being supported by the case 8, the adapter 2
0's protruding end into the case 8 positions it in the axial direction and restricts its axial movement.

Next, the effect will be explained.

While the vehicle is running, the rotational speed corresponding to the vehicle speed is transmitted from the engine to the differential gear 7 from the output section 5 of the transmission via the torque converter and the transmission with four forward speeds and one reverse speed.
The signal is transmitted from the fixed spur-toothed governor drive gear 14 in the gap between the parking gear 13 and the governor shaft 4 to the spur-toothed governor driven gear 23 spline-coupled to the governor shaft 4, thereby rotating the governor valve 6.
Governor valve 6 given rotation corresponding to vehicle speed
The governor weight 16 opens and closes in accordance with the rotational speed due to the balance between the force of the return spring 15 and the centrifugal force, and presses the spool 18. 66 to the hydraulic oil chamber 65 and the pressing force of the governor weight 16, the interlocking area between the oil chamber 64 and the input port 61 is increased or decreased, and the oil is taken in from the input port 61. The pressure of the hydraulic oil is regulated and outputted from the output port 62 to governor pressure oil corresponding to the vehicle speed.

In the above embodiment, the transmission of the transmission was a two-shaft type with four forward speeds and one reverse speed, but it may also be a three-, five-, or six-speed forward speed type, or a V-belt type continuously variable transmission. Naturally, it may be of a uniaxial type or a triaxial type.

As is clear from the above description, according to this embodiment, the governor hydraulic pressure generating means has one end protruding outside the case 8 and fixed to the case 8, and the other end protruding into the case 8. Cylindrical adapter 20
and the second shaft 2, which is the output shaft of the transmission.
a governor shaft 4 which is disposed in parallel with the adapter 20, is rotatably supported in the inner circumferential hole 21 of the adapter 20, has one end protruding outside the case 8, and the other end protruding into the case 8; , a governor weight 16 that is attached to one end of the governor shaft 4 and operates in accordance with the rotational speed; a valve spool 18 that slides into the center hole of the governor shaft 16 by the operation of the governor weight 16; and a valve spool 18 that is attached to the case 8. The governor weight 16
A cover 22 that covers the governor weight 16 and positions the governor weight 16 in the axial direction is rotatably supported by the case 8 by a bearing independently of the governor shaft 4, and is positioned in the axial direction by the adapter 20. The governor driven gear 23 is a spur gear to which the rotation of the shaft is transmitted, and the other end of the governor shaft 4 is connected to the governor driven gear 23 so that the axial center of the governor shaft 4 and the axial center of the governor driven gear 23 coincide with each other. Since the governor shaft 4 and the valve spool 18 can be removed from the outside of the case 8, the governor shaft 4 and the valve spool 18 can be removed from the outside of the case 8 since they are engaged so as to be rotatable together in the rotational direction and detachable in the axial direction. In that case, since the governor driven gear 23 is radially supported by the case 8 via a bearing, the governor driven gear 23 remains held in the case 8 even if only the governor shaft 4 and the valve spool 18 are removed. At this time, since the governor driven gear 23 is positioned in the axial direction by the adapter 20, the axial movement of the governor driven gear 23 is restricted, so that the governor driven gear 23 does not come off in the axial direction. Therefore, the governor hydraulic pressure generating means can be inspected and replaced very easily without removing the transmission case from the torque converter case and disassembling the gear transmission as in the conventional case.

Further, since the governor driven gear 23 is rotatably supported by the case 8 by a bearing and independently of the governor shaft 4, the governor driven gear 23
The radial force acting on the governor driven gear 23 is received by the bearing that supports the governor driven gear 23, and the force does not act on the governor shaft 4. Therefore, since only the rotational force of the governor shaft 4 is applied to the governor shaft support portion of the case 8, uneven wear does not occur on the sliding surfaces between the case 8 and the governor shaft 4.

[Brief explanation of drawings]

Figure 1 is an exploded sectional view of a conventional automatic transmission, Figure 2
The figure is a side view of the automatic transmission according to the present invention, FIG. 3 is an exploded sectional view of its main parts, FIG. 4 is a perspective view showing the shape of the inner hole of the governor driven gear and the other end of the governor shaft, and FIG. 5 is a sectional view of the governor valve. In the figure, 1...First shaft, 2...Second shaft, 3...Third shaft, 4...Governor shaft, 5...Output part of transmission, 6...Governor valve, 8...Case, 10 …
...Front part of the second shaft, 12...Differential drive gear, 13...Parking gear, 14...Governor drive gear, 23...Governor driven gear, 29...Inner hole, 30...Other end.

Claims (1)

[Scope of Claims] 1. An automatic transmission comprising a torque converter, a transmission, and a hydraulic control device that controls the torque converter and the transmission, wherein the hydraulic control device includes a governor that outputs a rotational speed signal. The governor hydraulic pressure generating means includes a cylindrical adapter having one end protruding outside the case and fixed to the case, and the other end protruding into the case, and an output shaft of the transmission. a governor shaft that is disposed parallel to the adapter, is rotatably supported in the inner peripheral hole of the adapter, and has one end protruding outside the case and the other end protruding into the case; and one end of the governor shaft. a governor weight that is attached to the case and operates according to the rotational speed; a valve spool that slides into the center hole of the governor shaft due to the operation of the governor weight; and a valve spool that is attached to the case and covers the governor weight and that is attached to the governor shaft. a spur gear governor which is rotatably supported by a bearing on the case independently of the governor shaft, is positioned in the axial direction by the adapter, and to which the rotation of the output shaft is transmitted. a driven gear, and the other end of the governor shaft is engaged with the governor driven gear so that the axis of the governor shaft and the axis of the governor driven gear match and are rotatable together in the rotational direction and detachable in the axial direction. An automatic transmission characterized by: 2. The governor driven gear has a cylindrical portion having a predetermined length in the axial direction at the center thereof, and the engagement between the other end of the governor shaft and the governor driven gear is formed on the inner circumferential surface of a hole in the cylindrical portion. A patent characterized in that the engagement is achieved by engagement between one or more flat portions formed on the cylindrical portion and a flat portion formed on the outer circumferential surface of the other end of the governor shaft in correspondence with the flat portion of the cylindrical portion. An automatic transmission according to claim 1.