JP3571991B2 - Transmission unit - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a transmission unit that performs gear shifting by supplying hydraulic pressure from an electric pump.
[0002]
[Prior art]
In recent years, from the viewpoint of protecting the global environment and saving finite resources, there is a demand for improved fuel efficiency of automobiles. A hybrid vehicle has been considered as one means for meeting the demand for improved fuel efficiency. In this hybrid vehicle, an engine and a motor are arranged in series or in parallel, the engine output is assisted, and at the time of deceleration, it acts as a generator, and the kinetic energy of the car is converted into electric energy, and this electric energy is used again. It is configured to assist output.
[0003]
When this hybrid vehicle is configured, it is conceivable that the motor and the like are newly configured without changing the basic layout of the conventional transmission, so that the cost can be reduced and applied to the conventional vehicle as it is. From such a viewpoint, for example, a transmission having a planetary gear described in JP-A-9-329228 is known as a conventional transmission.
[0004]
As shown in FIG. 7, this device includes a torque converter chamber 101 formed by a first housing 113 and a first partition 116, and a planetary gear chamber formed by a second housing 114, a first partition 116, and a second partition 117. And a transmission chamber 103 formed by the third housing 115 and the second partition wall 117. The rotation from the engine is input to the torque converter 110 in the torque converter chamber 101, and the output from the torque converter 110 is input into the planetary gear chamber 102, and the planetary gear 111 performs forward / reverse switching. The signal is input to the transmission 112 in 103.
[0005]
The transmission 112 is provided with a belt-type continuously variable transmission. The output rotation from the planetary gear 111 rotates the driving pulley 112a, and the rotation is transmitted to the driven pulley 112b by the belt 112c. I have. Oil pressure from a control valve unit (not shown) is sent to the shaft oil passage 123 of the drive pulley 112a via the case 120, the oil pump 121, and the input shaft 122, and supplies oil pressure to the drive pulley cylinder chamber 124 of the drive pulley. The gear ratio is being controlled.
[0006]
[Problems to be solved by the invention]
However, when forming a transmission unit for a hybrid vehicle without changing the basic layout of the conventional transmission unit, it is considered that an electromagnetic clutch is housed in the torque converter room 101 and a motor is housed in the planetary gear room 102. Can be At this time, the electromagnetic clutch and the motor need to be housed in a dry chamber (indicating that control and lubrication by oil are not performed).
Further, in a hybrid vehicle, a running state in which the engine is stopped is conceivable, and thus it is necessary to supply hydraulic pressure not by an engine-driven oil pump but by an electric oil pump.
[0007]
When such a configuration different from the related art is adopted, it is conceivable to provide the electric oil pump outside the transmission unit housing. For example, as shown in FIG. 8, a pump-side support portion 131 is provided above the electric oil pump 130, and a pump-side mounting portion 132 is provided below. By providing the housing-side support portion 114b and the housing-side mounting portion 114c also on the second housing 114 side, the electric oil pump 130 can be mounted without falling down.
[0008]
Here, since the electric oil pump 130 is driven by a motor, the movement of the motor generates vibration. The frequency generated at this time is F. This vibration is propagated from the pump-side support portion 131 to the housing-side support portion 114b, and is also propagated from the pump-side mount portion 132 to the housing-side mount portion 114c, and the partition wall 114a sandwiched between the support portion and the mount portion is formed. Vibrate. At this time, the natural frequency that depends on the rigidity of the partition 114a is f. If the relationship of f = nF (n = 1, 2,...) Holds, the amplitude of the partition 114a increases due to resonance, and particularly when the value of f, which is the natural frequency of the partition 114a, is small (ie, rigidity). Is low), there is a problem that noise and the like are generated.
[0009]
SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems and demands, and is intended to supply hydraulic pressure to a transmission mechanism even when an engine is stopped, while maintaining the basic layout of a conventional transmission unit. and purpose that the in vehicles of transmission units having an electric oil pump that can be, the vibration of the electric oil pump to provide a name have vehicles of transmission units can also occur problems such as noise as generated I do.
[0010]
[Means for Solving the Problems]
According to the first aspect of the present invention, there is provided a hydraulic control valve unit for controlling a transmission mechanism and controlling a hydraulic pressure for lubrication, and a joint is provided below an electric oil pump which is a hydraulic supply source for the hydraulic control valve unit. Is provided on the outer periphery of the unit housing of the transmission mechanism, and on a mounting portion provided on a radially outer peripheral surface of the input shaft of the transmission mechanism , the cylindrical axis of the electric oil pump is substantially perpendicular to a horizontal plane. in transmission units joined in a direction in which the pump-side support member extending in the unit housing side above the electric oil pump is provided, the partition wall of the unit housing, the housing side extending in the electric oil pump side By providing a support member and joining the joining portion and the attachment portion below the electric oil pump, The lower support portion for supporting the dynamic oil pump is provided, the upper support member for supporting the electric oil pump is provided by coupling the housing-side support member and the pump support member above the said electric oil pump, the lower Between the support portion and the upper support portion, a partition rib of the unit housing is provided with a grid-like rib rising vertically to the partition wall.
[0011]
In the invention according to claim 2, in speed change unit of claim 1, the partition frequency is the natural frequency of the partition wall having the ribs, at a frequency of vibration generated in the electric oil pump and characterized in that a certain pumping frequency on at least more than twice.
[0012]
According to a first aspect of the present invention, there is provided a transmission unit including a hydraulic control valve unit for controlling a transmission mechanism and controlling a hydraulic pressure for lubrication, and is a hydraulic pressure supply source for the hydraulic control valve unit. A joint portion is provided below the electric oil pump, and a cylindrical axis of the electric oil pump is substantially perpendicular to a horizontal plane at a mounting portion provided on the outer peripheral surface of the input shaft on the outer periphery of the housing of the transmission unit. It is joined in the direction. At this time, a pump-side support member extending toward the unit housing is provided above the electric oil pump, and a housing-side support member extending toward the electric pump is provided on a partition of the unit housing. In addition, a lower support portion that supports the electric oil pump by joining the joining portion and the attachment portion below the electric oil pump is provided, and a pump-side support member and a housing-side support member above the electric oil pump. Are connected to each other to provide an upper support portion for supporting the electric oil pump . Further, between the lower supporting portion and the upper supporting portion, the partition ribs of the unit housing are provided with grid-like ribs rising substantially perpendicular to the partition walls.
[0013]
Therefore, even if vibration occurs in the electric oil pump and the vibration propagates to the partition via the lower support and the upper support, and the partition vibrates, the rigidity of the partition is secured by providing the ribs. You. Therefore, the natural frequency of the partition can be increased, and the resonance region can be avoided.
[0014]
In the transmission unit according to claim 2, bulkhead frequency is the natural frequency of the partition wall having a rib, and the pump frequency of the at least more than double a frequency of the vibration generated in the electric oil pump ing.
[0015]
Therefore, it is possible to reliably avoid resonance up to the primary component and the secondary component of the pump vibration, and even if it resonates, since it is a tertiary or higher component and has a small amplitude, it is possible to reliably eliminate problems such as noise. .
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing a configuration of a main unit of the hybrid vehicle according to the embodiment.
1 is a transmission unit, 2 is an engine, 3 is a B motor for power generation / start, 4 is an inverter, 5 is a battery, 6 is an electric power steering, 7 is a hybrid control unit, and 8 is a chain.
[0017]
Inside the transmission unit 1, an electromagnetic clutch 11, an A motor 15 as a driving motor, and a continuously variable transmission (hereinafter referred to as CVT) 13 are housed, and the A motor 15 has energy during deceleration and braking. Also functions as a regenerative motor. Further, a C motor 9 for driving the electric hydraulic pump is provided. This is because, in a hybrid vehicle having a driving range using only a motor, an oil pump driven by an engine alone cannot obtain a hydraulic pressure (particularly a pulley hydraulic pressure of the CVT 13) when the motor only runs. For the same reason, the assisting force of the power steering 6 is also of an electric type, and is assisted by a motor.
[0018]
The B motor 3, which is a power generation / starting motor, is mounted on an engine block, and is connected to the engine 2 by a chain 8, and functions as a generator and a starter at the time of starting.
The control units 7a, 7b, 7c, 7d, 7e of the battery 5, the motors 3, 15, the engine 2, the clutch 11, and the CVT 13 are independent of each other, and are finally controlled by the hybrid control unit 7 in an integrated manner.
[0019]
Next, the operation of the drive system will be described.
The hybrid vehicle of the present embodiment is of a parallel type, and the A motor 15 functions as an assisting role of the engine 2 in which fuel efficiency is prioritized over output. The CVT 13 also plays a coordinating role for operating the engine at the best fuel efficiency point.
The clutch 11 is an electromagnetic clutch. When the clutch 11 is turned off, the vehicle runs only with the A motor 15. ON / OFF of the clutch 11 is automatically and optimally controlled by a clutch control unit 7d that receives a command from the hybrid control unit 7.
[0020]
(At system startup)
At the time of starting, the B motor 3 functions as a starter and starts the engine 2.
[0021]
(Starting at low speed)
When starting at low load or running at low speed with low fuel consumption efficiency of the engine 2, the engine 2 stops and the A motor 15 runs only. Even when the vehicle starts and runs at a low speed, if the load is large (the throttle opening is large), the engine 2 starts immediately, the clutch 11 is turned on, and the vehicle runs with the engine 2 and the A motor 15.
[0022]
(During normal driving)
The vehicle is driven mainly by the engine 2. In this case, driving on the best fuel efficiency line is realized by adjusting the engine speed by the shift control of the CVT 13.
[0023]
(At high load)
At the time of a high load in which the driving force is insufficient even when the engine 2 generates the maximum output, the electric energy is actively supplied from the battery 5 to the A motor 15, and the entire driving force is increased.
[0024]
(During deceleration)
During deceleration, the engine 2 is cut off fuel. At the same time, the A motor 15 functions as a generator, converts a part of the kinetic energy conventionally discarded into electric energy, and collects it in the battery 5.
[0025]
(At the time of retreat)
No reverse gear is set in the CVT 13. Therefore, when reversing, the clutch 11 is released, the A motor 15 is rotated in the reverse direction, and only the A motor 15 runs.
[0026]
(When stopped)
When the vehicle stops, the engine 2 stops. However, the engine 2 does not stop when the battery 5 needs to be charged, when the operation of the air conditioner compressor is required, or during warm-up.
[0027]
FIG. 2 is a sectional view of a transmission unit of a hybrid vehicle including a belt-type continuously variable transmission (CVT) according to the present invention. In FIG. 2, an engine output shaft 10 is connected to an electromagnetic clutch 11 as a rotation transmission mechanism, and is provided with a slip ring 11a for supplying power to the electromagnetic clutch 11. An output side of the electromagnetic clutch 11 is connected to a transmission input shaft 12. A drive pulley 14 of a CVT 13 is provided at an end of the transmission input shaft 12, and a drive pulley 14 and the electromagnetic clutch 11 are provided between the drive pulley 14 and the electromagnetic clutch 11. A running A motor (motor described in claims) 15 is provided so as to be located.
[0028]
The A motor 15 includes a rotor 16 fixed to the transmission input shaft 12 and a stator 17 fixed to the housing. The A motor 15 receives supply of electric power from the battery 5 to drive the transmission input shaft 12, or It functions as a generator based on the torque of the transmission input shaft 12 during deceleration or the like.
[0029]
The CVT 13 includes the drive pulley 14, the driven pulley 18, and a belt 19 that transmits the rotational force of the drive pulley 14 to the driven pulley 18. Drive pulley 14, the transmission and the fixed conical plate 20 which rotates together with the transmission input shaft 12, the hydraulic pressure acting on the driving pulley cylinder chamber 21 with being opposed to the fixed conical plate 20 to form a V-shaped pulley groove It comprises a movable conical plate 22 that is movable in the axial direction of the machine input shaft 12. The driven pulley 18 is provided on a driven shaft 23. The driven pulley 18 has a fixed conical plate 24 that rotates integrally with the driven shaft 23, a V-shaped pulley groove that is disposed opposite to the fixed conical plate 24, and a hydraulic pressure that acts on the driven pulley cylinder chamber 32. And a movable conical plate 25 that can move in the axial direction.
[0030]
A drive gear 26 is fixed to the driven shaft 23, and the drive gear 26 meshes with an idler gear 28 on an idler shaft 27. A pinion 29 provided on the idler shaft 27 meshes with the final gear 30. The final gear 30 drives a drive shaft that reaches a wheel (not shown) via a differential device 31.
[0031]
The torque input from the engine output shaft 10 to the CVT 13 as described above is transmitted to the CVT 13 via the electromagnetic clutch 11 and the transmission input shaft 12. The rotational force of the transmission input shaft 12 is transmitted to the differential 31 via the driving pulley 14, the belt 19, the driven pulley 18, the driven shaft 23, the driving gear 26, the idler gear 28, the idler shaft 27, the pinion 29, and the final gear 30. Is transmitted.
[0032]
At the time of power transmission as described above, the movable conical plate 22 of the driving pulley 14 and the movable conical plate 25 of the driven pulley 18 are moved in the axial direction to change the contact position radius with the belt 19. The rotation ratio between the driven pulley 18 and the speed change ratio can be changed. Such control of changing the width of the V-shaped pulley groove of the driving pulley 14 and the driven pulley 18 is performed by hydraulic control of the driving pulley cylinder chamber 21 or the driven pulley cylinder chamber 32 via the CVT control unit 7e. .
[0033]
By the way, the transmission housing accommodating such a transmission mechanism and a motor and the like are axially divided into a second housing 41 accommodating the CVT 13 and the A motor 15 and a first housing 42 accommodating the electromagnetic clutch 11. The configuration is divided into two. The second housing 41 is partitioned via a second partition 45 into a transmission room 43 in which the CVT 13 and the like are installed and a motor room 44 in which the A motor 15 is installed.
[0034]
The first housing 42 has a first partition wall 46 formed on one end face to which the second housing 41 is connected. When the housings 41 and 42 are connected, the motor chamber is located between the partition walls 45 and 46. The first housing 42 is configured to define a clutch chamber 47 between the first partition wall 46 and the engine 2 when the other end face of the first housing 42 is coupled to the engine 2 (not shown).
[0035]
The stator 17 of the A motor 15 is incorporated into the motor chamber 44 by shrink fitting, thereby simplifying the structure, while cooling the water jacket 48 formed in the second housing 41 so as to surround the stator 17. By circulating water, the A motor 15 can be efficiently cooled.
[0036]
FIG. 3 is a front view of the transmission unit of the hybrid vehicle including the electric oil pump.
An electric oil pump 64 is provided in the second housing 41 of the transmission unit. The electric oil pump 64 has a built-in C motor 9 and can supply necessary oil pressure even when the engine is stopped. A harness 65 for supplying a three-phase current to the C motor 9 is provided on an upper surface of the electric oil pump 64.
[0037]
Outside the third housing 49, a housing first oil passage 60 for supplying oil pressure to the drive pulley 14 and a housing second oil passage 61 for supplying oil pressure to the driven pulley 18 are provided. These oil passages 60, 61 are provided. Supplies hydraulic pressure from the control valve unit 70 to the drive pulley support 62 and the driven pulley support 63.
[0038]
Above the electric oil pump 64, a mounting tolerance absorbing support portion capable of absorbing the mounting tolerance is provided. A pump-side support portion 64a provided above the electric oil pump 64 and a housing-side support portion 41a provided on the second housing 41 are connected by bolts 66a. A vertically slidable bush 66b is provided between the pump-side support 64a and the bolt 66a, and a gap is provided between the bush 66b and the bolt 66a. Accordingly, the fall of the electric oil pump 64 can be prevented while absorbing the mounting tolerances in the vertical and front / rear and left / right directions which occur when the lower support portion 67 below the electric oil pump 64 is attached.
[0039]
FIG. 4 is a side view of the second housing 41 as viewed from the electric oil pump mounting portion 67a side. And the mounting portion 67 a of the electric oil pump 64 downwardly, the partition 81 sandwiched between the housing-side support portion 41a of the electric oil pump 64 upwards, grid-like, which is raised in a vertical direction to the partition wall 81 A rib 80 is provided. FIG. 5 is a perspective view illustrating the concept of the second housing 41. By providing the ribs 80 in the partition 81 between the mounting portion 67 a and the housing-side support portion 41a as shown, has secured rigidity of the partition wall 81.
[0040]
FIG. 6 is a sectional view of the second housing 41 to which the electric oil pump 64 is attached. As shown in the drawing, in the electric oil pump 64, vibration occurs according to the rotation speed of the C motor 9. The frequency of the vibration is F. The natural frequency of the partition 81 is determined by the rigidity of the partition. Let its natural frequency be f. At this time, when the natural frequency f satisfies the condition of f = nF (n = 1, 2, 3,...), The partition wall 81 resonates. In particular, when the condition of f = nF (n = 1, 2) is satisfied, resonance is caused by a primary component and a secondary component of the oil pump vibration. Since the primary component often has a large amplitude, noise is a problem. In many cases. Therefore, by improving the rigidity of the partition 81, at least f> 2F, and even if f = nF (n = 3, 4, 5,...), The third-order component or more of the oil pump vibration , And the amplitude is small, so there is no problem with noise. Therefore, by providing the ribs 80 such that f> nF, even if the electric oil pump 64 is attached to the second housing 41, it can be configured without generating noise.
[0041]
As described above, in the transmission unit of the hybrid vehicle according to the present embodiment, the lower support portion 67 is provided below the substantially cylindrical electric oil pump 64 that is a hydraulic supply source to the control valve unit 70, and The cylindrical shaft of the electric oil pump 64 is joined to a mounting part 67a provided on the outer peripheral surface of the transmission input shaft 12 on the outer periphery of the second housing 41 of the transmission unit in a direction in which the cylindrical axis of the electric oil pump 64 is substantially perpendicular to the horizontal plane. ing. At this time, a pump-side support member 64a extending toward the second housing 41 is provided above the electric oil pump 64, and a housing-side support member 41a extending toward the electric oil pump 64 is provided on a partition wall of the second housing 41. Is provided. A lower support portion 67 that supports the electric oil pump 64 is provided below the electric oil pump 64, and the pump-side support member 64 a and the housing-side support member 41 a are connected and supported above the electric oil pump 64. An upper support 66 is provided. Further, between the lower support portion 67 and the upper support portion 66, the partition 81 of the second housing 41 is provided with a grid-like rib 80 rising substantially perpendicular to the partition 81.
[0042]
Therefore, even if vibration is generated in the electric oil pump 64 and the vibration propagates to the partition 81 via the lower support part 67 and the upper support part 66, and the partition 81 vibrates, the rib 80 is provided. The rigidity of the partition 81 is secured. Therefore, the natural frequency f of the partition 81 can be increased, and the resonance region can be avoided, so that noise and the like do not occur.
[0043]
Also, the partition wall frequency f, which is the natural frequency of the partition 81 having the rib 80, has a frequency that is at least twice or more the pump frequency F, which is the frequency of the vibration generated in the electric oil pump 64. I have.
[0044]
Therefore, even if it resonates, it is a resonance of a higher order component or higher than the third order component of the oil pump vibration and the amplitude is small, so that there is no problem such as noise.
[0045]
It is needless to say that the present invention is applicable not only to a hybrid vehicle but also to an automatic transmission using only hydraulic pressure.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of a main unit of a hybrid vehicle according to an embodiment.
FIG. 2 is a cross-sectional view of a transmission unit of a hybrid vehicle including a belt-type continuously variable transmission (CVT) according to the embodiment.
FIG. 3 is a front view of a transmission unit according to the embodiment.
FIG. 4 is a side view of a second housing according to the embodiment.
FIG. 5 is a perspective view illustrating a concept of a second housing according to the embodiment.
FIG. 6 is an enlarged sectional view of a second housing provided with the electric oil pump according to the embodiment.
FIG. 7 is a sectional view showing a conventional transmission unit.
FIG. 8 is a conceptual diagram when an electric oil pump is attached to a conventional transmission unit housing.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Transmission unit 2 Engine 3 B motor 4 Inverter 5 Battery 6 Power steering 7 Hybrid control unit 7a Battery control unit 7b Motor control unit 7c Engine control unit 7d Clutch control unit 7e CVT control unit 8 Chain 9 C motor 10 Engine output shaft 11a Slip ring 11 Electromagnetic clutch 12 Transmission input shaft 13 CVT (belt type continuously variable transmission)
14 Drive Pulley 15 A Motor 16 Rotor 17 Stator 18 Driven Pulley 19 Belt 20 Fixed Conical Plate 21 Drive Pulley Cylinder Chamber 22 Movable Conical Plate 23 Driven Shaft 24 Fixed Conical Plate 25 Movable Conical Plate 26 Drive Gear 27 Idler Shaft 28 Idler Gear 29 Pinion 30 Final gear 31 Differential gear 32 Driven pulley cylinder chamber 41 Second housing 42 First housing 43 Transmission room 44 Motor room 45 Second partition 46 First partition 47 Clutch chamber 48 Water jacket 49 Third housing 60 Housing first oil passage 61 Housing second oil passage 62 Drive pulley support 63 Driven pulley support 64 Electric oil pump 64a Pump side support 64b Joining surface 65 Harness 66 Upper support 66a Bolt 66b Bush 67 Lower support 67a Attachment 70 Control Valve unit 80 Rib 81 Partition 101 Torque converter room 102 Planetary gear room 103 Transmission room 110 Torque converter 111 Planetary gear 112 Transmission 112a Drive pulley 112b Driven pulley 112c Belt 113 First housing 114 Second housing 114a Partition 114b Housing side support 114c Housing-side junction 115 Third housing 116 First partition 117 Second partition 120 Case 121 Oil pump 122 Input shaft 123 Shaft oil passage 124 Drive pulley cylinder chamber 130 Electric oil pump 131 Pump-side support 132 Pump-side junction F Pump frequency f Partition wall frequency

Claims (2)

Includes a hydraulic control valve unit for controlling the hydraulic pressure for control and lubrication of the transmission mechanism, the hydraulic control joints below the electric oil pump is a hydraulic supply source provided to the valve unit, the unit housing of the transmission mechanism In a transmission unit in which a cylindrical shaft of the electric oil pump is joined to a mounting portion provided on a radially outer circumferential surface of an input shaft of the transmission mechanism unit in a direction substantially perpendicular to a horizontal plane,
The pump-side support member extending in the unit housing side above the electric oil pump is provided,
On the partition of the unit housing, a housing-side support member extending toward the electric oil pump is provided.
Providing a lower support portion that supports the electric oil pump by joining the joining portion and the attachment portion below the electric oil pump,
An upper support member that supports the electric oil pump by connecting the pump-side support member and the housing-side support member above the electric oil pump ,
A transmission unit, wherein between the lower support portion and the upper support portion, a grid-like rib is provided on a partition wall of the unit housing, the rib being raised vertically to the partition wall. In a variation gearbox unit according to claim 1,
Transmission unit, characterized in that said partition wall frequency is the natural frequency of the partition wall having ribs, and with the electric oil pump frequency is a frequency of the vibration generated in the pump on at least more than twice.

Images