JP2002054724A - Automatic transmission with auxiliary hydraulic unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automatic transmission with an auxiliary hydraulic unit capable of connecting a hydraulic circuit in very simple constitution by disposing an auxiliary hydraulic unit in a position advantageous in assembling and space. SOLUTION: A motor-driven oil pump 12 is mounted on the outer peripheral part of an automatic transmission case 2, and connecting oil passages 13 and 15 are provided between the motor-driven oil pump 12 and an oil passage in the automatic transmission. The auxiliary hydraulic unit 12 is mounted on the outer peripheral part of the case 2, so that the automatic transmission and the auxiliary hydraulic unit are handled as one body. Accordingly, in assembling to a vehicle, the auxiliary hydraulic unit can be simply incorporated in the car body without surplus work such as mounting work.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of supplying hydraulic pressure to a friction engagement element of an automatic transmission when an engine is temporarily stopped.
Auxiliary hydraulic unit was provided to avoid shift shock and time lag when restarting the engine.
The present invention relates to an automatic transmission with an auxiliary hydraulic unit.

[0002]

2. Description of the Related Art Recently, a system has been developed in which an engine is stopped when a vehicle stops to improve fuel efficiency and suppress carbon dioxide emission.

However, with such a configuration, in the case of a vehicle equipped with an automatic transmission, the oil pump driven by the engine is stopped together with the stop of the engine.
The oil pressure that had been supplied to the automatic transmission until then disappeared,
The operation of the friction engagement element such as the clutch or the brake of the automatic transmission cannot be ensured.

Accordingly, a method is provided in which an auxiliary hydraulic unit such as an electric oil pump is separately provided, and when the engine is stopped, the auxiliary hydraulic unit is driven to supply the hydraulic pressure to the automatic transmission to ensure the operation of the friction engagement element. Has been proposed. Thus, each time the vehicle stops / restarts, the frictional engagement element repeatedly releases / engages, thereby preventing a shift shock or a time lag from occurring each time.

[0005]

However, when an auxiliary hydraulic unit such as an electric oil pump is provided, it is difficult to arrange the unit inside the automatic transmission because of the space, and it is inevitably arranged outside the automatic transmission. Will be
Where to place the auxiliary hydraulic unit is a major problem in terms of assembly and space, and no solution has been proposed yet. Further, even if the auxiliary hydraulic unit is arranged at an appropriate position, it is necessary to further connect the automatic transmission and the auxiliary hydraulic unit with a hydraulic circuit. However, many hydraulic circuits are already arranged in the automatic transmission, and arranging a new hydraulic circuit further causes a significant design change of the automatic transmission and an increase in the number of processing steps. Absent.

SUMMARY OF THE INVENTION In view of the above circumstances, the present invention not only can arrange an auxiliary hydraulic unit such as an electric oil pump at an advantageous position in terms of assembly and space, but also can provide an auxiliary hydraulic unit and an automatic transmission. It is an object of the present invention to provide an automatic transmission with an auxiliary hydraulic unit that can connect a hydraulic circuit with a configuration as simple as possible.

[0007]

According to the first aspect of the present invention, in addition to the oil pressure supplied from an oil pump (21) driven by an engine, an oil pressure is supplied to an oil passage (29) inside the automatic transmission. Auxiliary hydraulic unit (1
In the automatic transmission (1) with an auxiliary hydraulic unit provided with 2), the auxiliary hydraulic unit is mounted on an outer peripheral portion of a case (2) of the automatic transmission, and the auxiliary hydraulic unit and the inside of the automatic transmission are mounted. And the connecting oil passages (2c, 2d, 13, 15, 16, 17).

According to a second aspect of the present invention, the auxiliary hydraulic unit is mounted on an outer peripheral portion of the case corresponding to a position where the torque converter (6) is stored.

According to a third aspect of the present invention, the auxiliary hydraulic unit is mounted on an extension (2b) portion of the case.

According to a fourth aspect of the present invention, there is provided an automatic transmission, wherein a branch line (16) is formed in the case in a connecting oil passage between the auxiliary hydraulic unit and an oil passage inside the automatic transmission. An oil passage (17) penetrating through the case, which communicates with an oil passage to which oil pressure is supplied from the oil pump inside the machine, and a discharge port of the auxiliary hydraulic unit, the branch being provided. The pipeline is an oil passage (1) penetrating the case.
7), a first oil passage (16b) is connected to the first oil passage, and a clutch oil pressure detection auxiliary oil passage (16c) and an auxiliary oil pressure unit connection oil passage (16e) are connected to the first oil passage. Formed in shape.

According to a fifth aspect of the present invention, there is provided a connecting oil passage (2c, 3c, 13, 15, 16, 17) between the auxiliary hydraulic unit (12) and an oil passage (29) inside the automatic transmission. The check valve (2e, 1e, 1b) prevents the hydraulic oil from flowing from the automatic transmission toward the auxiliary hydraulic unit.
6d) is provided.

According to a sixth aspect of the present invention, a connecting oil passage between the auxiliary hydraulic unit and an oil passage inside the automatic transmission is provided with an oil pan (2a) in the automatic transmission and suction of the auxiliary hydraulic unit. Port (12b) is connected to the oil pan and the suction port (12) of the auxiliary hydraulic unit.
The connection oil passage between b) is constituted by a piping member (13).

According to a seventh aspect of the present invention, in the fourth aspect of the present invention, the operating oil is supplied from the first oil passage to the auxiliary oil pressure to the auxiliary hydraulic unit connecting oil passage (16e) of the branch pipe (16). A check valve (16d) for preventing a flow toward the unit (12) is provided.

According to an eighth aspect of the present invention, in the fourth aspect of the invention, the oil passage penetrating the case is constituted by a clutch pressure detecting oil passage (17).

[0015]

According to the first aspect of the present invention, since the auxiliary hydraulic unit (12) is mounted on the outer peripheral portion of the case (2) of the automatic transmission (1), the automatic transmission and the auxiliary hydraulic unit are connected. This makes it possible to handle them as a single unit, and can be easily incorporated into a vehicle without performing any extra work such as mounting the auxiliary hydraulic unit on the vehicle body, similarly to a conventional automatic transmission.

According to the second aspect of the present invention, since the auxiliary hydraulic unit (12) is mounted on the outer peripheral portion corresponding to the position where the torque converter (6) is stored, the multi-stage transmission mechanism (3) is stored. Further, it is not necessary to perform processing for mounting the auxiliary hydraulic unit on the central main portion of the automatic transmission (1), which can contribute to the common use of main components.

According to the third aspect of the present invention, since the auxiliary hydraulic unit (12) is mounted on the extension (2b) where the output shaft (11) is mounted, the multi-stage transmission mechanism (3) is housed. This eliminates the need to perform processing for mounting the auxiliary hydraulic unit on the main part of the central portion of the automatic transmission (1), which can contribute to the common use of main parts.

According to the invention of claim 4, the branch pipe (1)
According to 6), the connection oil passage can be formed by using the oil passage (17) penetrating the case provided in the automatic transmission (1).

According to the invention of claim 5, the check valve (2e,
According to 16d), it is possible to prevent the hydraulic oil generated by the oil pump (21) driven at the time of engine rotation from flowing into the auxiliary hydraulic unit side and being drained.

According to the invention of claim 6, the piping member (13) connected to the auxiliary hydraulic unit is provided with an oil pan (2).
a), there is no need to newly form a connection oil passage between the auxiliary hydraulic unit and the automatic transmission in the multi-stage transmission mechanism (3), and the automatic transmission with the auxiliary hydraulic unit has a simple configuration. Provision is possible.

According to the seventh aspect of the present invention, the check valve (16)
Since d) is provided in the branch conduit (16), there is no need to provide a check valve in the multi-stage transmission mechanism (3), and an automatic transmission with an auxiliary hydraulic unit having a simple configuration can be provided.

According to the invention of claim 8, the branch pipe (1)
According to 6), the connection oil passage can be formed using the clutch pressure detection oil passage (17) originally provided in the automatic transmission (1). There is no need to form the inside of the automatic transmission, so that it is possible to prevent the structure inside the automatic transmission from becoming complicated and increasing the number of processing steps.

The numbers in parentheses are for convenience of indicating corresponding elements in the drawings, and therefore, the present description is not limited to the description on the drawings.

[0024]

FIG. 1 is a circuit diagram showing an example of a main part of a hydraulic circuit of an automatic transmission in which an auxiliary hydraulic unit is arranged. FIG. 2 is a front view showing an auxiliary hydraulic unit mounted in front of a case. FIG. 3 is a side view of FIG. 2. FIG. 4 is a bottom view of FIG. FIG. 5 is a cross-sectional view illustrating an example of a branch conduit. FIG.
1 is a sectional view showing an example of an automatic transmission to which the present invention is applied. FIG. 7 is an external view of the automatic transmission shown in FIG. FIG.
FIG. 4 is an external view of an automatic transmission showing another embodiment of the present invention. FIG.
Fig. 4 is a front view showing another embodiment of the present invention. FIG.
FIG. FIG. 11 is a side view of FIG.

As shown in FIG. 6, the automatic transmission 1 has a housing 2 that covers a torque converter 6 described later, a transmission case that covers the multi-stage transmission mechanism 3, and an extension 2b in which the output shaft 11 is disposed. The case 2 is provided with a torque converter 6 having a multi-speed transmission mechanism 3 and a lock-up clutch 5 housed therein. The multi-stage transmission mechanism 3 includes, from the torque converter 6 side, an overdrive unit 7 including a C0 clutch and one simple planetary gear, which will be described later, and a main transmission unit 9 including a Simpson-type planetary gear unit 9a and one simple planetary gear 9b. Are located. The automatic transmission 1 changes the rotation of the input shaft 10 to five forward speeds and one reverse speed and outputs the output shaft 11 to the output shaft 11.

As shown in FIG. 7, the automatic transmission 1 has an electric oil pump 12 as an auxiliary hydraulic unit mounted on a lower portion of an outer peripheral portion of the case 2 corresponding to a position where the torque converter 6 is stored. Have been. Electric oil pump 12
2 to 4, an electric motor 12d and a pump 12e rotationally driven by the electric motor 12d, as shown in FIGS.
Are assembled together, and the assembled electric oil pump 12 is fixed to the case 2 via a bracket 12a. In addition, the electric oil pump 1
The second pump 12e has a suction port 12b and a discharge port 12c. One end of a pipe 13 is connected to the suction port 12b, and the other end of the pipe 13 is connected to an oil pan 2a provided at a lower portion of the case 2.
One end of a pipe 15 is connected to c.
Is connected to the case 2 of the automatic transmission 1 through the branch line 16.
And is connected to a clutch pressure detecting oil passage 17 formed and opened.

As shown in FIG. 5, the branch conduit 16 is substantially L-shaped.
The main body 16a has a main body 16a shaped like a letter.
Is formed with a transmission connection pipe line 16b which is screwed to the above-described oil pressure path 17 for detecting clutch pressure. The upper end of the transmission connection line 16b in the figure is branched into two branches, one of which is formed with a clutch pressure detection line 16c, and the clutch pressure detection line 16c is opened at the tip, and will be described later with reference to FIG. A pressure gauge 19 for measuring the clutch pressure can be connected. The pressure gauge 19 is not connected in a normal use state of the automatic transmission 1, and the clutch pressure detecting pipe line 16c is closed by a cap nut 16f or the like. When assembling or maintaining the automatic transmission 1, when measuring the hydraulic pressure of hydraulic oil supplied to the C0 clutch disposed in the overdrive section 7, the cap nut 16f is removed, and the pressure gauge 19 is connected and used. You.

An electric oil pump connecting line 16e is formed on the other side of the transmission connecting line 16b together with a check valve 16d provided in the middle thereof. Is connected.

FIG. 1 schematically shows a hydraulic circuit between the electric oil pump 12 and the automatic transmission 1. A primary regulator valve 22 and a manual valve 2 are connected to an oil pump 21 that is connected from an oil pan 2a via a strainer 20 and is rotationally driven by an engine (not shown).
3. The pressure control valve 25 is connected, and the manual valve 23 is further connected to a C1 clutch as a friction engagement element that is always kept in the engaged state when the automatic transmission 1 is in the forward movement state.

The pressure control valve 25
Is connected to an overdrive C0 clutch together with an accumulator 27 via a shift valve 26. An oil passage 29 between the shift valve 26 and the C0 clutch is It is connected via a clutch pressure detecting oil passage 17 which is an oil passage penetrating through the case 2 and formed in the middle of the passage 29. Branch line 16
As described above, the clutch pressure detecting line 16c
The pressure gauge 19 can be connected to the electric oil pump 12, and the electric oil pump 12 is connected to the electric oil pump 12 via an electric oil pump connection pipe line 16e. A strainer 20 provided in the oil pan 2 a is connected to the electric oil pump 12 via a pipe 13.

Since the automatic transmission 1 and the like have the above configuration, the oil pump 21 is driven to rotate when the vehicle is moving forward, that is, when the engine is driven.
The hydraulic pressure generated by the oil pump 21 is supplied as a line pressure to a primary regulator valve 22, a manual valve 23, a pressure control valve 25, and the like.
It is also supplied to the zero clutch. Due to this line pressure, C1
The clutch and the C0 clutch are appropriately engaged and driven, and the automatic transmission 1 can perform a normal shift operation. At this time, the line pressure from the oil pump 21 also acts on the branch line 16 via the oil line 29 and the clutch pressure detecting oil line 17, but the hydraulic pressure acting on the branch line 16 is The pipe line 16c is sealed with a cap nut 16f, and the electric oil pump connection pipe line 16e is prevented from transmitting hydraulic oil, and therefore oil pressure, to the electric oil pump 12 by a check valve 16d. The operation oil inside flows to the electric oil pump 12 side, and the occurrence of a situation of leakage is prevented beforehand.

Next, when the engine stops driving when the vehicle is stopped, the driving of the oil pump 21 that has been rotationally driven by the engine is stopped, and the oil pump 2 is stopped.
1, the hydraulic pressure supplied to the C1 clutch and the C0 clutch naturally decreases, and if no processing is performed, the C1 clutch or the C0 clutch that was in the engaged state during forward movement The hydraulic pressure of the clutch is drained,
The clutch is released. However, at the same time as the engine is stopped, the electric oil pump 12 starts to rotate,
The electric oil pump 12 sucks the oil in the oil pan 2a through the strainer 20 and the pipe 13, and supplies the oil from the pipe 15 to the electric oil pump connection pipe 16e of the branch pipe 16 at a predetermined pressure.

The oil supplied to the electric oil pump connection line 16e is returned to the transmission connection line 16b, the oil pressure of which is reduced by the stop of the oil pump 21, and the check valve 16d.
And is supplied to the oil passage 29 from the clutch pressure detecting oil passage 17 of the case 2. Thereby, the oil passage 29
, The low-pressure friction engagement element holding pressure is supplied from the electric oil pump 12, and the C0 clutch and the C1 clutch are held in the play-tight state immediately before the engagement by the friction engagement element holding pressure. Will be done.

In this state, when the engine is started again and the vehicle starts to move forward, the rotation of the oil pump 21 is restarted by the engine, and the line pressure generated by the oil pump 21 is supplied to the automatic transmission 1. The line pressure is also supplied to the friction engagement elements such as the C0 clutch and the C1 clutch, so that the automatic transmission 1 starts the shifting operation. Even when the engine is stopped, the friction engagement element holding pressure is supplied to the C0 clutch and the C1 clutch by the electric oil pump 12, so that even when the line pressure is supplied when the engine is restarted, the backlash is immediately reduced. The engagement operation is started in a short time, and the engagement operation is performed in a short time and in a form that minimizes the occurrence of a shift shock, thereby effectively preventing the driver from feeling uncomfortable when starting operation of the vehicle. .

When the supply oil pressure of the C0 clutch needs to be measured during maintenance or the like even when the electric oil pump 12 is still mounted, the pressure gauge 19 is used to detect the clutch pressure in the branch line 16. By removing and attaching the cap nut 16f to the conduit 16c, the oil pressure can be measured smoothly.

In the above-described embodiment, the electric oil pump 12
Is mounted on the outer peripheral lower surface of the case 2 on the side of the torque converter 6, but the electric oil pump 12
As long as it is mounted on the case 2, it may be mounted anywhere. For example, as shown in FIGS. 8 to 11, the automatic transmission 1 may be attached to a lower part of an extension 2 b where the output shaft 11 is disposed, which is located behind a central portion of the housing in which the multi-speed transmission mechanism 3 is stored. It is possible.

In this case, the suction port 12b and the discharge port 12c of the electric oil pump 12 are formed in the bracket 12a, and the oil passage 2c between the oil pan 2a and the suction port 12b and the C0 clutch are provided in the extension 2b. An oil passage 2d is formed between the oil passage 29 and the discharge port 12c. This eliminates the need for special branch pipes 16 and pipes 13 and 15. Note that the oil passage 29 of the C0 clutch is provided in the oil passage 2d.
Is provided with a check valve 2e. Since the extension 2b of the case 2 has a smaller diameter than the other parts of the case 2, the electric oil pump 12 can be easily mounted.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing an example of a main part of a hydraulic circuit of an automatic transmission in which an auxiliary hydraulic unit is arranged.

FIG. 2 is an exemplary front view showing an auxiliary hydraulic unit mounted in front of a case;

FIG. 3 is a side view of FIG. 2;

FIG. 4 is a bottom view of FIG. 2;

FIG. 5 is a sectional view showing an example of a branch pipeline.

FIG. 6 is a sectional view showing an example of an automatic transmission to which the present invention is applied.

FIG. 7 is an external view of the automatic transmission shown in FIG. 6;

FIG. 8 is an external view of an automatic transmission showing another embodiment of the present invention.

FIG. 9 is a front view showing another embodiment of the present invention.

FIG. 10 is a bottom view of FIG. 9;

FIG. 11 is a side view of FIG. 9;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Automatic transmission 2b ... Extension 2c, 2d ... Connection oil path (oil path) 2e, 16d ... Check valve 6 ... Torque converter 12 ... Auxiliary hydraulic unit 12b ... Suction ports 13, 15 ...... Connection oil passage (pipe) 16 ... Connection oil passage (branch passage) 16b ... First oil passage (mission connection passage) 16c ... Clutch pressure detection auxiliary oil passage (Clutch pressure detection Pipe line) 16e ... Oil passage for connecting auxiliary hydraulic unit (Electric oil pump connection pipe line) 17 ... Connection oil passage, oil passage penetrating through the case (oil passage for clutch pressure detection) 29 ... Inside the automatic transmission Oilway (oilway)

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kazuhisa Ozaki 10 Takane, Fujiicho, Anjo, Aichi Prefecture Inside Aisin AW Co., Ltd. (72) Yasutomo Miura 10 Takane, Fujiicho, Anjo, Aichi Prefecture Aishi Inside AW Co., Ltd. (72) Inventor Toshiyuki Miyoshi 10th Takane, Fujii-cho, Anjo-city, Aichi Prefecture Inside Ain-AW Co., Ltd. (72) Kazuto Enomoto 10th Takane, Fujii-cho, Anjo-city, Aichi Prefecture Inside Aisin AW Co., Ltd. (72) Inventor Osamu Takeuchi 10 Takane, Fujiicho, Anjo-shi, Aichi Prefecture Inside Aisin AW Co., Ltd. (72) Inventor Yasuo Hojo 1st Toyota Town, Toyota-shi, Aichi Prefecture Toyota (72) Inventor Hideo Tomomatsu 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Automotive Stock In-house (72) Inventor Tadashi Tomohiro 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation (72) Inventor Toru Matsubara 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Motor Corporation F-term (reference) 3J063 AA01 AB43 AB52 AC04 BA01 BB50 CA01 CA09 CC16 CD22 CD41 CD45 CD65 CD70 XA11

Claims (8)

[Claims] 1. An automatic transmission with an auxiliary hydraulic unit provided with an auxiliary hydraulic unit capable of supplying an oil pressure to an oil passage inside an automatic transmission in addition to a hydraulic pressure supplied from an oil pump driven by an engine. In the transmission, the auxiliary hydraulic unit is mounted on an outer peripheral portion of a case of the automatic transmission, and a connection oil path is provided between the auxiliary hydraulic unit and an oil path inside the automatic transmission. , Automatic transmission with auxiliary hydraulic unit. 2. The automatic transmission with an auxiliary hydraulic unit according to claim 1, wherein the auxiliary hydraulic unit is mounted on an outer peripheral portion of the case corresponding to a position where the torque converter is stored. 3. The automatic transmission with an auxiliary hydraulic unit according to claim 1, wherein the auxiliary hydraulic unit is mounted on an extension portion of a case. 4. An oil passage for connection between the auxiliary hydraulic unit and an oil passage inside the automatic transmission, a branch conduit formed in the case, and a branch line from the oil pump inside the automatic transmission. An oil passage communicating with an oil passage to which hydraulic pressure is supplied, the oil passage penetrating the case, and a discharge port of the auxiliary hydraulic unit are provided. The branch conduit is an oil passage penetrating the case. 2. A first oil passage connected to the first oil passage, wherein a clutch oil pressure detection auxiliary oil passage and an auxiliary oil pressure unit connection oil passage are connected to the first oil passage. 3. Automatic transmission with auxiliary hydraulic unit. 5. A connection oil passage between the auxiliary hydraulic unit and an oil passage inside the automatic transmission, wherein a hydraulic oil from the automatic transmission side flows toward the auxiliary hydraulic unit side. 2. The automatic transmission with an auxiliary hydraulic unit according to claim 1, further comprising a check valve for preventing the automatic transmission. 6. An oil passage for connection between the auxiliary hydraulic unit and an oil passage inside the automatic transmission is provided so as to connect an oil pan in the automatic transmission and a suction port of the auxiliary hydraulic unit. The automatic transmission with an auxiliary hydraulic unit according to claim 1, wherein the connecting oil passage between the oil pan and the suction port of the auxiliary hydraulic unit is constituted by a piping member. 7. A check valve for preventing hydraulic oil from flowing from the first oil passage toward the auxiliary hydraulic unit is provided in an oil passage for connecting an auxiliary hydraulic unit in the branch conduit. An automatic transmission with an auxiliary hydraulic unit according to claim 4. 8. The automatic transmission with an auxiliary hydraulic unit according to claim 4, wherein the oil passage penetrating the case is a clutch pressure detecting oil passage.