JPH062063Y2 - Two-speed transmission - Google Patents

Description

[Detailed Description of the Invention] Industrial field of application The present invention provides a two-stage rotation speed of a rotary drive load in an air conditioner or the like having a rotary drive load such as a water pump or a blower fan that is rotationally driven by an electric motor. The present invention relates to a changeable two-stage transmission.

2. Description of the Related Art As disclosed in, for example, Japanese Utility Model Publication No. 60-5291 or Japanese Patent Publication No. 60-50241, a mechanical two-stage system is provided in a drive path between an electric motor and a water pump or a blower fan in an air conditioner. A technique is known in which a transmission is provided and the speed of the transmission is switched by feedback control or timer control based on temperature detection, and the driving speed of a water pump or a blower fan is switched between two speeds. In an air conditioner equipped with such a transmission, the energy consumption of a fluid transportation machine such as a water pump or a fan is proportional to the cube of the number of revolutions and the number of revolutions is about 8
If it is reduced to 0%, the energy consumption will be halved.
And because the mechanical transmission has almost no loss of horsepower, it exhibits a high energy saving effect.

By the way, in a relatively small air-conditioning facility, as shown in FIG. 4, the electric motor M and the rotary drive load P are coupled, and the motor shaft Ma of the electric motor M and the input rotary shaft Pa of the rotary drive load P are coupled C. It has been installed so that it will be directly connected.

Problems to be Solved by the Invention In the case where a mechanical two-stage transmission is added to an existing rotary drive device as shown in FIG. 4, conventionally, an electric motor M and a rotary drive load P are used. And needed a complete relocation with. That is, there is no transmission that can be compactly installed instead of the coupling C.

Therefore, conventionally, it is necessary to increase the space for installing the device and to newly manufacture the device base, and it is desirable to remove the transmission and quickly return to the arrangement of FIG. 4 when the transmission fails. There was no.

Therefore, this invention is a coupling C as shown in FIG.
In order to solve the above problems, a two-stage transmission that is compactly installed is provided instead.

Technical means taken to solve the problem. Therefore, the present invention is directed to an electric motor M and a rotary drive load P that is rotationally driven by the electric motor M as illustrated in FIG.
In the two-stage transmission (the shift case is indicated by reference numeral 1) interposed between and, the following technical measures were taken.

That is, first, a hollow input shaft 2 that can be fixed by inserting the motor shaft Ma of the electric motor M and a hollow output shaft 3 that can be fixed by inserting the input rotation shaft Pa of the rotary drive load P are provided in the transmission case 1. Are provided concentrically with each other to form an annular recess 3a on the inner surface of the output shaft 3 and to form a cylindrical overhanging portion 2a on the input shaft 2 which projects into the annular recess 3a. The bearing 4 is arranged between the portions 2a.

Further, an intermediate shaft 5 parallel to the input shaft 2 and the output shaft 3 is provided in the transmission case 1, and a first gear 6 fixedly installed on the input shaft 1 and a second gear 7 fixedly installed on the intermediate shaft 5 are provided. The output shaft 3 and the third gear 8 which meshes with each other and is loosely fitted and installed on the intermediate shaft 5.
A reduction gear train for engaging the reduction gear interlocking between the input shaft 2 and the output shaft 3 by meshing with the fourth gear 9 fixedly installed on the intermediate shaft 5 is provided between the intermediate shaft 5 and the third gear 8. A one-way clutch 10 that is engaged by driving from the 5 side is provided.

Further, a cylindrical projecting portion 3b projecting toward the first gear 6
Is formed on the output shaft 3 and an annular recess 6a is formed in the first gear 6 so as to open toward the inside of the tubular overhang 3b, and the tubular overhang 3b serves as a clutch housing. A hydraulic clutch 11 having a clutch piston 12 incorporated in 6a is disposed between the input shaft 2 and the output shaft 3, and a hydraulic pump 13 for refueling the hydraulic clutch 11 is provided so as to be driven by the intermediate shaft 5. Oil passages 14, 15 and 16 for supplying and discharging hydraulic oil to and from the hydraulic clutch 11 are formed in the wall of the transmission case 1, the input shaft 2 and the first gear 6.

Action As shown in FIG. 1, the transmission according to the present invention inserts the motor shaft Ma of the electric motor M into the input shaft 2 to fix the motor shaft Ma to the input shaft 2, and to rotate the input rotation of the rotary drive load P. Axis P
It is used by inserting "a" into the output shaft 3 and fixing it to the output shaft 3, and stopping the transmission case 1 from rotating by a stay 19 as illustrated in FIG. 3, for example.

Since the first to fourth gears 6-9 constitute the reduction gear train, the one-way clutch 1 is operated when the hydraulic clutch 11 is operated to directly connect the input shaft 2 and the output shaft 3.
0 receives a drive from the side of the fourth gear 9 that rotates integrally with the output shaft 2 and runs idle. Therefore, by operating the hydraulic clutch 11, the rotational drive load P is driven at the same speed as the electric motor M,
Further, by disengaging the hydraulic clutch 11, the rotational drive load P can be driven at a rotational speed that is slower than that of the electric motor M by the operation of the reduction gear train 6-9 by the automatic engagement of the one-way clutch 10.

Since the intermediate shaft 5 is constantly driven to rotate by the input shaft 2 via the first and second gears 6 and 7, the hydraulic pump 13 is constantly driven to supply hydraulic oil to the hydraulic clutch 11 at any time. The hydraulic clutch 11 can be activated.

Embodiment In the illustrated embodiment, the hollow input shaft 2 has a key groove 20 on its inner peripheral surface, and a key 21 is planted on the motor shaft Ma.
Is fitted into the key groove 20 to fix the motor shaft Ma and the input shaft 2. The hollow output shaft 3
Has a large inner diameter and a tapered inner peripheral surface so as to be adapted to the rotation input shaft Pa having a different outer diameter, and is rotated via the taper bush 23 fitted with the key 22 on the rotation input shaft Pa. It is supposed to be fixed to the input shaft 3. The taper bush 23 is the flange portion 2 at the outer end.
It is supposed that it is fixed to the output shaft 3 with a screw bolt 24 at 3a.

The bearings 4 are a pair of ball bearings, and are disposed between the large-diameter side peripheral surface of the annular recess 3a of the output shaft 3 and the outer peripheral surface of the cylindrical overhanging portion 2a of the input shaft 2, and both shafts 2, 3 are provided so as to support each other and stabilize the shaft support. An oil seal 17 is further arranged between the annular recess 3a and the cylindrical overhanging portion 2a according to one embodiment of the present invention. The oil seal 17 prevents oil in the speed change case 1 from leaking toward the end faces of the motor shaft Ma and the input rotary shaft Pa, and shifts the gear even though the hollow input shaft 2 and output shaft 3 are provided. Oil tightness inside and outside the case 1 shall be ensured. It is also possible to adopt a structure in which the bearing 4 and the oil seal 17 are arranged between the small-diameter side peripheral surface of the annular recess 3a and the inner peripheral surface of the tubular overhanging portion 2a.

FIG. 1 is a developed vertical view of the transmission case 1, and the intermediate shaft 5 is installed at a lower level in the transmission case 1 as shown in FIG. As shown in FIG. 1, the third gear 8 is loosely fitted on the intermediate shaft 5 via a pair of ball bearings 25, and the one-way clutch 10 is arranged between the ball bearings 25. The fourth gear 9 is formed integrally with the output shaft 3.

In the hydraulic clutch 11 having a tubular housing 3b of the output shaft 3 as a clutch housing, one and the other friction elements 26 and 27 are supported by the input shaft 2 and the tubular output 3b of the output shaft so as to be slidable. It will be done. First gear 6
The piston 12 housed in the annular recess 6a of the piston moves in the opposite direction to the friction elements 26, 27 by the disc spring 28 interposed between the piston 12 and the input shaft 2 in the annular groove hole formed on the inner peripheral end side. Has been urged.

The hydraulic pump 13 has its pump shaft end 29 engaged with the intermediate shaft 5 in a hole in the end face of the intermediate shaft 5 so as not to rotate relative to the intermediate shaft 5.
It is installed on the outer surface of the transmission case 1 on the electric motor M side. As shown in FIG. 2, the suction port 30 of the hydraulic pump 13 is connected to the inside of an oil strainer 31 provided in the lower portion of the transmission case 1 by a suction oil passage 32 in the wall of the transmission case 1. Similarly, as shown in FIG. 2, an electromagnetic valve 33 for controlling the operation of the hydraulic clutch 11 is installed on the upper surface of the speed change case 1, and the discharge port 34 of the hydraulic pump 13 is a discharge oil passage in the wall of the speed change case 1. It is made to communicate with the inside of the solenoid valve 33 by 35. From the solenoid valve 33, the oil passage 14 in the wall of the transmission case 1 is guided to the outer peripheral position of the input shaft 2.

The oil passage 1 in the input shaft 2 is provided on the outer peripheral surface of one end of the input shaft 2.
5, an annular groove 15a located at the base end of the annular groove 15a is formed, and a sleeve 36 for sealing the outer peripheral end of the annular groove 15a is fitted and held in the hole of the wall of the transmission case 1 on one end of the input shaft 2,
An oil passage hole 37 formed in the sleeve 36 connects the oil passage 14 and the annular groove 15a.

The illustrated two-stage transmission is installed in an air conditioner or the like, and between the electric motor M and the rotary drive load P such as a cooling water pump as shown in FIG. 3, the motor shaft Ma is connected to the input shaft 2 as described above. , The rotary input shaft Pa is inserted and fixed to the output shaft 3 in the manner shown in FIG. 1, and the rotary drive load P is applied by the electric motor M.
Is used for driving while shifting the gear in two stages. The operation of the solenoid valve 33 shown in FIG. 2 is controlled by, for example, detecting the temperature in the air-conditioned space, and hydraulic oil is supplied to the hydraulic clutch 11 to operate the clutch 11 to rotate the rotary drive load P to the electric motor M. In a state in which the hydraulic clutch 11 is rotated at a constant speed, hydraulic oil is drained from the hydraulic clutch 11, and the clutch 11 is deactivated to automatically engage the one-way clutch 10 to rotate the rotary drive load P at a rotational speed of about 80% of the electric motor M. And get the condition.

Advantageous Effects of Invention In the two-stage transmission of the present invention, a concentric input shaft 2 and an output shaft 3 are respectively formed in a hollow shaft and provided in a transmission case 1, and both shafts 2 and 3 of the output shaft 3 are provided. The bearing 4 arranged between the annular recess 3a and the cylindrical overhanging portion 2a of the input shaft 2 supports each other for stable shaft support, and the transmission case 1 is made parallel to the input shaft 2 and the output shaft 3. The operation of the reduction gear train provided so as to reduce the speed of the input and output shafts 2 and 3 via the intermediate shaft 5 provided therein is obtained by the one-way clutch 10 that is compactly constructed, and the input shaft 2 An installation space in which a hydraulic clutch 11 capable of directly connecting the output shaft 3 and the output shaft 3 is provided with a tubular piston 3b of the output shaft 3 as a clutch housing and a first reduction gear 6 on the input shaft 2 with a clutch piston 12 provided therein. Things that do not require as much as possible The operating mechanism of the hydraulic clutch 11 is configured such that the intermediate shaft 5 is constantly driven by the input shaft 2 and the hydraulic pump 13 is operated by the intermediate shaft 5, and the clutch operating oil is supplied and discharged. Oil passage 14,1
5, 16 in the wall of the transmission case 1, the input shaft 2, and the first for deceleration
It is formed in the gear 6 and provided as required, and the input shaft 2 and the output shaft 3 are connected in the transmission case 1 by inserting the mating shafts Ma and Pa connected thereto. The width of the transmission as viewed in the axial direction of the input / output shafts 2 and 3 is greatly compressed because it is hollow and the two-stage transmission mechanism is compactly arranged in the transmission case 1. It is compact.

Therefore, as shown in FIG. 4, the two-stage transmission of the present invention is installed in an existing air conditioner or the like in which the motor shaft Ma and the input rotary shaft Pa of the rotary drive load P are connected by the coupling C. 3rd instead of coupling C
It can be installed and installed as shown in the figure, and does not require relocation of the electric motor M and the rotary drive load P, and does not require a new space in a narrow place such as a machine room of an air conditioner. In addition to eliminating the need to manufacture a new device mount, the gearbox is removed and the electric motor M is mounted on the same mount when the transmission breaks down or during maintenance and inspection.
The shafts of the rotary drive load P and the rotary drive load P are directly connected to each other by a coupling so that the rotary drive load P can be rapidly re-driven, and the completion of repair of the transmission or the like can be awaited.

It should be noted that instead of the hydraulic clutch 11, another one-way clutch whose engaging direction is different from that of the one-way clutch 10 is inserted and interposed between the output shafts 2 and 3, and the electric motor M is rotated forward and reverse to Although it may be possible to adopt a structure in which a gear shift is obtained, in this structure, when the rotation direction of the electric motor M is switched, the rotation driving load P
This is not preferable because the drive of may be temporarily stopped. That is, when the rotary drive load P has a small inertia torque like a cooling water pump, but receives a large brake torque due to the resistance of the water supply pipe line, the above temporary drive stop can occur.

[Brief description of drawings]

FIG. 1 is a developed vertical sectional side view showing an embodiment of the present invention in use, FIG. 2 is a partial vertical sectional front view substantially along the line II--II of FIG. 1, and FIG. FIG. 4 is a side view showing a state of use, and FIG. 4 is a side view showing an existing device including an electric motor and a rotary drive load driven by the electric motor. M ... Electric motor, Ma ... Motor shaft, P ... Rotation drive load,
Pa ... Input rotary shaft, 1 ... Gear change case, 2 ... Input shaft, 2a
... Cylindrical overhanging part, 3 ... Output shaft, 3a ... Annular recess, 3b ...
Cylindrical overhanging portion, 4 ... Bearing, 5 ... Intermediate shaft, 6 ... First
Gear, 6a ... annular recess, 7 ... second gear, 8 ... third gear,
9 ... 4th gear, 10 ... One way clutch, 11 ... Hydraulic clutch, 12 ... Clutch piston, 13 ... Hydraulic pump, 1
4, 15, 16 ... Oil passage, 17 ... Oil seal, 20 ... Key groove, 21 ... Key, 22 ... Key, 23 ... Tapered bush.

Claims (2)

[Scope of utility model registration request] 1. A two-stage transmission interposed between an electric motor M and a rotary drive load P rotationally driven by the electric motor M, wherein a motor shaft Ma of the electric motor M can be inserted and fixed. A hollow input shaft 2 and a hollow output shaft 3 into which the input rotary shaft Pa of the rotary drive load P can be inserted and fixed can be concentrically arranged in the transmission case 1, and an annular recess 3a can be provided on the inner surface of the output shaft 3. The input shaft 2 is formed with a tubular protruding portion 2a which is formed and protrudes into the annular recess 3a, and a bearing 4 is disposed between the annular recess 3a and the tubular protruding portion 2a. An intermediate shaft 5 parallel to the shaft 3 is provided in the transmission case 1, and a first gear 6 fixedly installed on the input shaft 1 and a second gear 7 fixedly installed on the intermediate shaft 5 mesh with each other and the intermediate shaft 5 A third gear 8 and an output shaft 3 which are loosely fitted and installed on the upper side.
A reduction gear train for reducing and interlocking the input shaft 2 and the output shaft 3 with each other by meshing with a fourth gear 9 fixedly installed on the intermediate shaft 5 is provided between the intermediate shaft 5 and the third gear 8. A one-way clutch 10 that is engaged by driving from the 5 side is provided, and a cylindrical overhanging portion 3b that overhangs toward the first gear 6 is provided.
Is formed on the output shaft 3 and an annular recess 6a is formed in the first gear 6 so as to open toward the inside of the tubular overhang 3b, and the tubular overhang 3b serves as a clutch housing. A hydraulic clutch 11 having a clutch piston 12 incorporated in 6a is disposed between the input shaft 2 and the output shaft 3, and a hydraulic pump 13 for refueling the hydraulic clutch 11 is provided so as to be driven by the intermediate shaft 5. A two-stage transmission in which oil passages 14, 15 and 16 for supplying and discharging hydraulic oil to and from the hydraulic clutch 11 are formed in the wall of the transmission case 1, the input shaft 2 and the first gear 6. 2. The two-stage transmission according to claim 1 of the utility model registration, wherein an oil seal 17 is provided between the annular recess 3a of the output shaft 2 and the cylindrical overhanging portion 2a of the input shaft 3.
A two-speed transmission that is equipped with.