JPH0624253U - Gearbox - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a speed change device capable of performing a speed change operation easily and accurately in response to rotation transmitted from a transmission mechanism. A first planetary gear device B in which a first sun gear 6 is connected to a drive shaft 5 driven by an engine, and a second sun gear on a driven shaft 10 of an auxiliary machine 1 which is concentric with the drive shaft 5. 11
And the second planetary gear device C connected to each other by connecting the corresponding first planetary gears 7 and second planetary gears 12 rotatably and concentrically to each other. In the stopped state, the rotation of the drive shaft 5 is directly used as the rotation of the auxiliary machine 1, and in the high speed rotation range of the engine, the motor 3 rotates the second internal gear 13 of the second planetary gear device C through the worm gear mechanism to drive the auxiliary gear 1. The rotation of the auxiliary machine 1 can be changed easily and accurately in response to the rotation of the shaft 5.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a transmission device between an engine of a vehicle or the like and an auxiliary device (a power steering pump, a car cooler compressor or the like) driven and rotated by the engine via a belt transmission mechanism.

[0002]

[Prior art]

 Conventionally, as a transmission of this type, for example, there is one described in Japanese Utility Model Publication No. 62-34048. In this transmission, a belt is stretched between an engine-side pulley and an accessory-side pulley that has a variable groove width and is biased so as to always narrow, and the tension is changed by abutting on the belt. A movable pulley and its moving cylinder are provided between the engine-side pulley and the accessory-side pulley, and the belt tension is increased by the movable pulley in the low-speed rotation range of the engine to hang the belt on the accessory-side pulley. Keeping the rotation speed of the auxiliary machine at a certain height by decreasing the diameter of the auxiliary machine, and by increasing the belt diameter on the auxiliary machine side pulley by decreasing the belt tension by the movable pulley in the high engine speed range, The rotation speed of the machine was reduced to prevent unnecessary high-speed rotation of auxiliary machines.

[0003]

[Problems to be solved by the device]

 However, in the above-mentioned conventional transmission, in order to press the movable pulley against the belt and accurately change the tension of the belt by adjusting the pressing amount, the pressure controlled by the cylinder is stabilized. A pressure source to supply is required, which requires electrohydraulic control, which makes the system complex and expensive. Further, since the movable pulley for changing the belt tension and the cylinder for moving the movable pulley are arranged between the engine side pulley and the accessory side pulley, it becomes difficult to lay out the belt and the like for the engine. Furthermore, the amount of pressing of the movable pulley against the belt is adjusted to adjust the belt hanging diameter on the accessory side pulley, resulting in poor responsiveness when the engine speed changes suddenly, and even when the accessory is temporarily damaged. High-speed rotation may be unavoidable.

The present invention has been made to solve the above-mentioned conventional problems, and an object thereof is to provide a speed change device that can perform a speed change operation easily and accurately in response to rotation transmitted from a transmission mechanism.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, a transmission according to the present invention connects a first sun gear to a drive shaft driven by an engine or the like, and meshes a first planetary gear with the first sun gear. The first planetary gear unit is configured by engaging the first planetary gear with the first internal gear fixed to the auxiliary device housing, and the second sun is attached to the driven shaft of the auxiliary device arranged concentrically with the drive shaft. Gears are connected, a second planetary gear is meshed with the second sun gear, and a second internal gear formed on a ring gear rotatable with respect to the accessory housing is meshed with the second planetary gear. , A second planetary gear device, which rotatably and concentrically connects the corresponding first planetary gear and second planetary gear, and a worm wheel is concentrically connected to the second internal gear, and the worm wheel is connected to the worm wheel. , The worm mounted on the motor output shaft, Is allowed, the worm gear mechanism is negative efficiency is obtained form the shape to be substantially 0.

[0006]

[Action]

 According to the above configuration, even if the rotational force acts on the second internal gear and the worm wheel, the rotational force is not transmitted to the worm, and the load torque of the motor becomes almost zero regardless of the load torque of the auxiliary machine. .

Although the motor is not rotated in the low speed rotation range of the engine, in this case, the second internal gear is held by the worm via the worm wheel and cannot rotate like the first internal gear. When the first sun gear is rotated by the drive shaft in such a state, when the first planetary gear and the second planetary gear revolve around the first sun gear and the second sun gear while rotating around the second sun gear, respectively. The sun gear is rotated by the second planetary gear at the same speed and in the same direction as the first sun gear.

Further, when the worm is rotated by the motor in the high speed rotation range of the engine and the second internal gear is rotated in the deceleration direction of the second sun gear through the worm wheel, the influence of the rotation of the second internal gear is affected. Via the second planetary gear, the rotation of the second sun gear is decelerated.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a plan view showing a transmission, FIG. 2 is a sectional view taken along the line AA of FIG. 1, FIG. 3 is a conceptual view showing the transmission of FIG. 1, and FIG. 4 is a load torque of a pump and a motor. Is a diagram showing the relationship between the required torque and the vehicle speed, FIG. 5 is a diagram showing the relationship between the vehicle speed and the pump rotation speed, and FIG.

In the figure, 1 is a pump (auxiliary machine) such as a vane pump for power steering, 2 is a transmission, 3 is a speed change operation motor, and 4 is an auxiliary machine side pulley. A belt (not shown) is stretched between the accessory side pulley 4 and an engine side pulley (not shown) to form a belt transmission mechanism.

A first sun gear 6 is connected to a drive shaft 5 equipped with an accessory-side pulley 4, a first planetary gear 7 is meshed with the first sun gear 6, and the first planetary gear 7 is connected to the first planetary gear 7. The first internal gear 9 fixed to the pump housing 8 (auxiliary equipment housing) is meshed with each other to form a first planetary gear set B.

A second sun gear 11 is connected to a driven shaft 10 of the accessory 1 arranged concentrically with the drive shaft 5, and a second planetary gear 12 is meshed with the second sun gear 11. The second planetary gear unit 12 is meshed with a second internal gear 13 which is a ring gear rotatable with respect to the pump housing 8 to form a second planetary gear unit C.

The second planetary gear 12 is rotatably mounted on the interlocking shaft 14 connected to the first planetary gear 7, so that the corresponding first planetary gear 7 and second planetary gear 12 can rotate. Connected concentrically.

A worm wheel 15 having a smaller diameter than that of the second internal gear 13 is concentrically connected to the second internal gear 13. A worm 17 mounted on the output shaft of the motor 3 is meshed with the worm wheel 15. There is. The worm gear mechanism including the worm wheel 15 and the worm 17 is formed so that the reverse efficiency (the efficiency when the worm 17 is rotated by the rotation of the worm wheel 15) is substantially zero.

Reference numerals 18 and 19 denote speed sensors. The speed sensor 18 is installed so as to detect the rotation speed of the drive shaft 5, and the speed sensor 19 detects the rotation speed (pump rotation speed) of the driven shaft 10 of the pump 1. It is installed as possible. Further, 20 is a vehicle speed sensor, and this vehicle speed sensor 20 is installed so as to detect the vehicle speed. Each sensor and the motor 3 are connected to the control device 21.

In the above configuration, since the reverse efficiency of the worm gear mechanism is almost 0, even if the rotational force acts from the second planetary gear 12 to the second internal gear 13 and the worm wheel 15, the worm 17 does not rotate. Since the force is not transmitted, the load torque of the motor 3 can be made almost zero regardless of the load torque of the pump 1 as shown in FIG. Further, since the worm wheel 15 is formed to have a smaller diameter than the second internal gear 13, the worm gear mechanism can be downsized at a reduced speed ratio, so that the capacity of the motor 3 can be reduced. Therefore, the size of the motor 3 can be reduced. Incidentally, as shown in FIG. 4, when the rotational force acts on the second internal gear 13 and the worm wheel 15, the greater the reverse efficiency, the easier the motor 3 is to rotate (regardless of its rotating direction). A load torque may be applied to the motor 3 and the pump 1.

In the low speed rotation range of the engine, the motor 3 is in a non-energized state and is in a stopped state. In this case, the second internal gear 13 is held by the worm 17 via the worm wheel 15 and is similar to the first internal gear 9. It cannot be rotated. When the drive shaft 5 is rotated by the engine through the belt transmission mechanism and the first sun gear 6 rotates in such a state, the first planetary gear 7 revolves around the first sun gear 6 while rotating on its own axis. The second planetary gear 12 revolves around the second sun gear 11 while being rotated by being moved by the first planetary gear 7. The second sun gear 11 causes the second sun gear 11 to rotate in the same direction at the same speed as the first sun gear 6. That is, the rotational force can be directly transmitted from the drive shaft 5 to the driven shaft 10 of the pump 1 without changing the rotational speed and the rotational direction.

Further, when the worm 17 is rotated by the motor 3 in the high speed rotation range of the engine and the second internal gear 13 is rotated in the deceleration direction of the second sun gear 11 via the worm wheel 15, this second The influence of the rotation of the internal gear 13 is received via the second planetary gear 12, and the rotation of the second sun gear 11 is decelerated. That is, the rotational speed can be reduced from the drive shaft 5 without changing the rotational direction and the rotational force can be transmitted to the driven shaft 10 of the pump 1.

The rotation speed (pump rotation speed) of the driven shaft 10 of the pump 1 is controlled as follows. That is, as shown in FIG. 5, the controller 21 has a large pump rotation speed when the vehicle speed is low and a small pump rotation speed when the vehicle speed is fast. As shown in the figure, the pump speed is large in the low speed range of the engine and low in the high speed range of the engine. The pump speed for the engine speed (here, the speed of the drive shaft 5) is set by inputting. Keep it. Then, the rotation speed of the drive shaft 5 is detected by the speed sensor 18, the pump rotation speed is detected by the speed sensor 19, the vehicle speed is detected by the vehicle speed sensor 20, and the respective detection signals are input to the control device 21. Then, the rotation control of the motor 3 is performed by the control device 21, the rotation of the second sun gear 11 is decelerated in the high speed rotation range of the engine, and the pump rotation speed corresponding to the vehicle speed and the engine rotation speed is obtained.

Next, another embodiment of the present invention will be described with reference to FIGS.

FIG. 7 is a conceptual diagram showing a transmission device, FIG. 8 is a relationship diagram between engine speed and tacho-generator voltage, FIG. 9 is a relationship diagram between tacho-generator voltage and motor speed, and FIG. It is a relationship diagram with a pump rotation speed. In FIG. 7, the same parts as those in the above embodiment are designated by the same reference numerals.

This embodiment is different from the above-mentioned embodiments in that the rotation control of the pump 1 is possible without requiring a control device.

Specifically, a pulley 22 is mounted on the drive shaft 5, and a belt 25 is stretched between the pulley 22 and a pulley 24 mounted on the rotary shaft of the tachogenerator 23. Further, the tacho generator 23 is connected to the motor 3.

In such a configuration, in the low speed rotation range of the engine, as shown in FIG. 8, the voltage generated by the tachogenerator 23 is low, and the worm gear mechanism and the like have friction that serves as rotation resistance of the motor 3, so that the worm 17 and The motor 3 does not rotate. Therefore, since the second internal gear 13 is held by the worm 17 via the worm wheel 15 and cannot rotate, the second sun gear 11 has the same speed as the first sun gear 6 as in the previous embodiment. Is rotated in the same direction. Further, in the high speed rotation range of the engine, the voltage generated by the tacho generator 23 is high as shown in FIG. 8, so that the motor 3 starts to rotate and overcomes the friction of the worm gear mechanism as shown in FIG. The tooth gear 13 rotates in the deceleration direction of the second sun gear 11. As shown in FIG. 8, the tacho generator 23 generates a voltage proportional to the engine speed (here, the rotation speed of the drive shaft 5), and as shown in FIG. 9, the rotation speed of the motor 3 also increases as the voltage increases. Therefore, the rotation speed of the second internal gear 13 also increases. Depending on the ascending slope, it is possible to keep the pump rotational speed substantially constant with respect to the engine rotational speed as shown in FIG. 10 or to gradually increase or decrease the pump rotational speed.

[0026]

[Effect of device]

 As described above, the present invention has a first planetary gear unit in which a first sun gear is connected to a drive shaft driven by an engine, and a second sun gear is attached to a driven shaft of an accessory that is concentric with the drive shaft. The connected second planetary gear unit is combined by connecting the corresponding first planetary gear and second planetary gear rotatably and concentrically, and the motor is stopped in the low speed rotation range of the engine. The rotation of the drive shaft can be directly used as the rotation of the auxiliary machine, and in the high speed rotation range of the engine, the second internal gear of the second planetary gear device is rotated by the motor via the worm gear mechanism to rotate the drive shaft. The rotation of the auxiliary machinery can be changed easily and accurately in a quick response. Further, the reverse efficiency of the worm gear mechanism is almost zero, and even if a rotating force acts from the second planetary gear to the second internal gear and the worm wheel, the rotating force is not transmitted to the worm and the load torque of the motor is reduced. Can be almost zero. Further, the worm wheel can be formed to have a smaller diameter than the second internal gear, so that the worm gear mechanism can be downsized and the motor capacity can be reduced. Therefore, it is possible to perform a gear shift operation with a small motor without difficulty, and the gear shift can be adjusted accurately, and the response is good even when the engine rotation speed changes suddenly. It is extremely effective. Further, since the gear type transmission is provided between the drive shaft and the driven shaft of the auxiliary machine, the layout is easier than the conventional one.

[Brief description of drawings]

FIG. 1 is a plan view showing a transmission according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

3 is a conceptual diagram showing the transmission of FIG. 1. FIG.

4 is a relationship diagram between a load torque of a pump and a required torque of a motor in the transmission shown in FIG.

FIG. 5 is a relationship diagram between vehicle speed and pump rotation speed.

FIG. 6 is a relationship diagram between an engine speed and a pump speed.

FIG. 7 is a conceptual diagram showing a transmission according to another embodiment of the present invention.

FIG. 8 is a relationship diagram between an engine speed and a tacho-generator voltage.

FIG. 9 is a relationship diagram between a tacho generator voltage and a motor rotation speed.

FIG. 10 is a relationship diagram between an engine speed and a pump speed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pump (auxiliary equipment) 2 Transmission device 3 Motor for shifting operation 4 Pulley (transmission mechanism) 5 Drive shaft 6 First sun gear 7 First planetary gear 8 Auxiliary equipment housing 9 First internal gear B B First planetary gear device 10 Driven shaft 11 Second sun gear 12 Second planetary gear 13 Second internal gear C Second planetary gear device 14 Interlocking shaft 15 Worm wheel 16 Output shaft 17 Worm

Claims (1)

[Scope of utility model registration request] 1. A first sun gear is connected to a drive shaft driven by an engine or the like, a first planetary gear is meshed with the first sun gear, and the first planetary gear is fixed to an accessory housing. A first planetary gear device is configured by meshing a first internal gear, and a second sun gear is connected to a driven shaft of an auxiliary machine arranged concentrically with the drive shaft, and a second sun gear is connected to the second sun gear. A planetary gear is meshed with the second planetary gear, and a second internal gear formed on a ring gear that is rotatable with respect to the accessory housing is meshed with the second planetary gear device to form a second planetary gear device. The first planetary gear and the second planetary gear are rotatably concentrically connected to each other, and the worm wheel is concentrically connected to the second internal gear, and the worm mounted on the output shaft of the motor is meshed with the worm wheel. , This worm gear mechanism has almost the reverse efficiency A transmission which is formed so as to be zero.