JP4867426B2 - Transmission - Google Patents

Description

  The present invention relates to a transmission that outputs an output of a prime mover such as an internal combustion engine at a different speed, and more particularly to a transmission that includes a continuously variable transmission mechanism.

  A continuously variable transmission (hereinafter referred to as CVT) capable of continuously changing the gear ratio at the time of transmitting power is put into practical use. Various proposals have been made as a mechanism for continuously obtaining a transmission gear ratio. One of them is a belt having two V-shaped grooves and a belt wound around the V-shaped groove. There is known a mechanism for changing the speed ratio of two pulleys by changing the belt winding radius by changing the groove width of the character.

  In this belt-type continuously variable transmission mechanism, the ratio of the wrapping radius of the belt between the two pulleys becomes the transmission gear ratio, so if the range of the transmission gear ratio is widened, the outer diameter of the pulley increases and the device becomes larger. There is a problem.

  In the following Patent Document 1, a multi-stage transmission mechanism having a planetary gear mechanism and a continuously variable transmission mechanism are arranged in series to ensure a wide range of gear ratios.

  Patent Document 2 below discloses a transmission that combines a belt-type continuously variable transmission mechanism and a planetary gear mechanism. In this transmission, at low speed, the output of the continuously variable transmission mechanism is transmitted to the output shaft without going through the planetary gear mechanism, and at high speed, the input to the planetary gear mechanism is connected to the output shaft, continuously variable transmission mechanism, and And is returned to the input shaft again via a continuously variable mechanism. By providing the planetary gear mechanism, the mechanical gear stage is set to two stages and a wide range of gear ratios is secured.

JP 60-67455 A JP-A-8-35545

  In the transmission of Patent Document 1, the speed ratio becomes discontinuous before and after the speed change operation of the multi-stage speed change mechanism, and a so-called speed change shock occurs. This shock causes vibration of the vehicle on which the transmission is mounted, and is also sensed by the passenger. In addition, the shock acts on the belt of the continuously variable transmission mechanism, thereby reducing the life of the belt. In the transmission of Patent Document 2 described above, at the high speed stage, one of the power distributed by the planetary gear mechanism returns to the input shaft again, so that the power transmission efficiency decreases. Further, when switching between the high speed stage and the low speed stage, the direction of power transmission of the continuously variable transmission mechanism is reversed. At this time, the load on the belt increases, which may reduce the life of the belt.

  The present invention provides a transmission having a continuously variable transmission mechanism and having a small size and a wide range of gear ratio.

  The transmission of the present invention includes a continuously variable transmission that can continuously change the transmission ratio of power transmission, and a multi-stage transmission that selects a discretely set transmission ratio and changes the transmission ratio step by step. Have. The continuously variable transmission has one input element, a first output element, and a second output element. The multi-stage transmission unit includes a first transmission unit that is connected to the first output element and has at least one shift step, and a second transmission unit that is connected to the second output element and has at least one shift step. Furthermore, it has the switching part which selects whether power is transmitted through which of a 1st transmission part and a 2nd transmission part.

  The continuously variable transmission unit can also have two input elements, a first input element and a second input element, and one output element. The multi-stage transmission unit may include a first transmission unit that is connected to the first input element and has at least one shift step, and a second transmission unit that is connected to the second input element and has at least one shift step. . Furthermore, it has the switching part which selects which power is transmitted through which of a 1st transmission part and a 2nd transmission part.

  The continuously variable transmission unit winds the belt around three pulleys having V-shaped grooves so as to fit into the V-shaped grooves, and changes the width of the V-shaped grooves of the two pulleys. The gear ratio can be changed continuously by changing the winding radius. Two pulleys that can change the width of the V-shaped groove are referred to as a first variable groove width pulley and a second variable groove width pulley, and another pulley having a fixed groove width is referred to as a fixed groove width pulley. In the configuration including two output pulleys, the variable groove width pulley corresponds to the output pulley, and the input pulley corresponds to the fixed groove width pulley. In the configuration including two input pulleys, the variable groove width pulley corresponds to the input pulley, and the output pulley corresponds to the fixed groove width pulley. The first transmission part of the multi-stage transmission part is connected to the first variable groove width pulley, and the second transmission part is connected to the second variable groove width pulley.

  Power can be input to the fixed groove width pulley, and either the first or second variable groove width pulley can be selected and output.

  Further, the power can be input to either the first or second variable groove width pulley and output to the fixed groove width pulley by selecting the switching unit.

  The multi-stage transmission unit can alternately arrange the shift stages from the low speed side in the first transmission unit and the second transmission unit. That is, when the lowest first speed is arranged in the first transmission unit, the second speed can be arranged in the second transmission unit, and the third speed can be arranged in the first transmission unit again.

  The shift-up shift operation of the transmission that employs a continuously variable transmission including three pulleys having a V-shaped groove and a belt is performed in a state where the first transmission with the first speed selected by the switching unit is selected. The gear ratio is shifted from the low speed side to the high speed side by changing the groove width of the first variable groove width pulley. When the continuously variable transmission unit is at the highest speed side, the switching unit switches to the second transmission unit in which the second speed is selected. At this time, the gear ratio in the second variable groove width pulley is on the low speed side, and shifts from here to the high speed side to perform speed change. When the continuously variable transmission becomes the highest speed side, the switching unit switches to the first transmission unit for which the third speed has been selected in advance. At this time, the gear ratio in the first variable groove width pulley is on the low speed side, and shifts from here to the high speed side to perform the speed change.

  In this way, in the configuration employing the continuously variable transmission unit including the three pulleys including the two variable groove width pulleys and the belt, when the transmission ratio of one variable groove width pulley shifts to the high speed side, In conjunction with this, the gear ratio of the other variable groove width pulley shifts to the low speed side.

  The overall transmission ratio of the multi-stage transmission unit and the continuously variable transmission unit can be made to coincide before and after the speed change operation of the multi-stage transmission. According to this, during the speed change operation by the continuously variable transmission, the speed ratio continuously varies, and the overall speed ratio also matches in the speed change operation in the multi-speed transmission. The gear ratio can be continuously changed over the entire speed range.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1-4 shows a schematic configuration of a transmission 10 for a vehicle according to the present embodiment. 1 is a front view, FIG. 2 is a side view, FIG. 3 is a side view of a continuously variable transmission unit, and FIG. 4 is a side view of a multi-stage transmission unit and a switching unit.

A belt 18 is wound around three pulleys 12, 14, 16 having V-shaped grooves. Of the three pulleys, one is an input pulley 12 with a fixed V-shaped groove width, and the remaining two are a first output pulley 14 and a second output whose V-shaped groove width can be changed. It is a pulley 16. One of these two output pulleys 14 and 16 selected by the switching unit described later is involved in power transmission. First output pulley 14, on the first output pulley shaft 20 which is the axis of the pulley, having Purihafu 14A, 1 4 B forming a pair are arranged side by side in the axial direction. In the pulley halves 14A and 14B, opposing surfaces are formed on a part of a conical side surface, whereby a V-shaped groove is formed. Similarly, the second output pulley 16 also has pulley halves 16A and 16B arranged in pairs on the second output pulley shaft 22, and these pulley halves form a V-shaped groove. Hydraulic chambers 21 and 23 are disposed on the back surfaces of one pulley halves 14A and 16A of the first and second output pulleys, respectively, and the pulley halves 14A and 16A are controlled by controlling the hydraulic pressure in the hydraulic chambers 21 and 23, respectively. Move in the axial direction. This movement changes the width of the V-shaped groove.

  The input pulley 12 has a V-shaped groove, but this groove width is fixed. The input pulley 12 is provided on the input shaft 24, and these are rotated together in a rotational direction such as a spline, and are coupled by a method that allows movement in the axial direction. The input pulley may be a sprocket without a groove or a toothed pulley, and in this case, the belt has a shape corresponding thereto.

  As described above, the belt 18 is wound around the three pulleys 12, 14, and 16, and the first and second output pulleys of the belt 18 are wound by changing the width of the V-shaped groove. The radius is changed. If the groove width is increased, the winding radius decreases, and if it is narrowed, the winding radius increases. By continuously changing the groove width, the winding radius can also be changed continuously, and the gear ratio can also be changed continuously. The change in the groove width of the first and second output pulleys 14 and 16 is controlled in synchronism so that the belt 18 does not loosen. Therefore, when the groove width of the first output pulley 14 is expanded and the winding radius of the belt is decreased, the groove width of the second output pulley 16 is conversely narrowed and the winding deformation is increased. By changing the groove width of the output pulley, the center of the belt 18 moves slightly in the axial direction, and the input pulley 12 can move in the axial direction as described above in order to allow this movement.

  The input pulley 12, the first and second output pulleys 14, 16, the hydraulic mechanism including the hydraulic chambers 21, 23 for changing the groove width of these output pulleys, and the belt 18 serve as the continuously variable transmission. included.

  The multi-stage transmission unit includes a first gear transmission mechanism 32 including a first output pulley shaft 20, a first intermediate shaft 26 disposed in parallel therewith, and gear sets 28 and 30 provided on these shafts, and a second gear transmission mechanism 32. The output pulley shaft 22, a second intermediate shaft 34 disposed parallel to the output pulley shaft 22, and a second gear transmission mechanism 38 including a gear set 36 provided on these shafts. The gear set 28 of the first gear transmission mechanism 32 includes a gear 28A rotatably supported on the first output pulley shaft 20 and a gear 28B fixed on the first intermediate shaft 26. This gear set 28 is a first speed gear set, and is hereinafter referred to as a first speed gear set 28. Similarly, the gear set 30 is a third speed gear set 30 including a gear 30 </ b> A rotatably supported on the first output pulley shaft 20 and a gear 30 </ b> B fixed to the first intermediate shaft 26. One of the first speed gear set 28 and the third speed gear set 30 is selected by the first gear switching mechanism 40 and meshed with the first input pulley shaft 20. As the first gear switching mechanism 40, a known gear switching mechanism such as a constant meshing type or a synchronous meshing type can be used. Moreover, it can also comprise using friction clutches, such as a multi-plate clutch. The selected one of the gears 28A and 30A rotates integrally with the first input shaft 20, and the rotation of the first input shaft 20 is transferred to the first intermediate shaft 26 via the gear 28B or the gear 30B meshing with the first input shaft 20. Communicated.

  The gear set 36 of the second gear transmission mechanism 32 is a second speed gear set 36 comprising a gear 36A rotatably supported on the second output pulley shaft 22 and a gear 36B fixed on the second intermediate shaft 34. It is. A reverse gear 42A for reversing the vehicle is rotatably supported on the second output pulley shaft 22. The reverse gear 42A meshes with the idle gear 42C, and the idle gear 42C meshes with the first speed gear 28B. These three gears constitute a reverse gear set 42, and the first speed gear 28B functions as a driven gear 42B of the reverse gear set 42. The second speed gear set 36 and the reverse gear set 42 are meshed with the second input pulley shaft 22 selected by the second gear switching mechanism 44. The second gear switching mechanism 44 can also be a gear switching mechanism in a transmission device such as a constant meshing type or a synchronous meshing type, or a friction clutch such as a multi-plate clutch.

  The first and second intermediate shafts 26 and 34 have a double arrangement in which the first intermediate shaft 26 is a hollow shaft, and the second intermediate shaft 34 passes through the hollow portion. This arrangement is advantageous for reducing the outer diameter of the entire apparatus, but it is also possible to adopt a configuration in which two axes are arranged in parallel or a configuration in which the axes are arranged in series along a common axis. The first and second intermediate shafts 26 and 34 are selectively connected to the output shaft 48 via the output switching mechanism 46. The output switching mechanism 46 includes a first clutch 50 that connects the first intermediate shaft 26 to the output shaft 48, and a second clutch 52 that connects the second intermediate shaft 34 to the output shaft 48. The first and second clutches 50 and 52 can be, for example, multi-plate clutches. By controlling the discontinuity of the first and second clutches 50 and 52, the intermediate shaft connected to the output shaft 48, the gear speed change mechanism, and the output pulley are selected, and the path through which power is transmitted is determined. An output gear 54 is fixed to the output shaft 48 and meshes with a ring gear 58 of the differential device 56.

  5 and 6 are explanatory diagrams of the speed change operation of the continuously variable transmission unit. FIG. 5 shows a state where the belt winding radius Ro1 of the first output pulley 14 is maximum and the belt winding radius Ro2 of the second output pulley 16 is minimum. This state is the low speed side where the rotational speed is the lowest with respect to the first output pulley shaft 20, and the gear ratio at that time is represented by Ro1 / Ri if the winding radius Ri of the input pulley 12 is used. On the other hand, the state of FIG. 5 is the high speed side where the rotational speed is highest for the second output pulley shaft 22, and the gear ratio is Ro2 / Ri.

  FIG. 6 shows a state where the belt winding radius Ro1 of the first output pulley 14 is minimum and the belt winding radius Ro2 of the second output pulley 16 is maximum, contrary to the state of FIG. This state is on the high speed side where the rotational speed is highest for the first output pulley shaft 20, while it is on the low speed side where the rotational speed is lowest for the second output pulley shaft 22.

  FIG. 7 is a diagram showing the speed ratio of the transmission 10 (reciprocal of the speed ratio). The horizontal axis represents the speed ratio of the continuously variable transmission section, and the vertical axis represents the speed ratio of the continuously variable transmission section and the multistage transmission section. The overall speed ratio is shown. The operation of the transmission 10 will be described with reference to this figure.

  An operation for accelerating the speed of the output shaft 48 will be described. In the lowest speed state, in the multi-stage transmission unit, the first speed gear set 28 is selected by the first gear switching mechanism 40, and the first intermediate shaft 26 is connected to the output shaft 48 by the output switching mechanism 46. The state in which the first speed gear set 28 is selected in this multi-stage transmission unit is the range indicated by mode 1 in FIG. On the other hand, the continuously variable transmission is in a state of being at the lowest speed with respect to the first output pulley shaft shown in FIG. When accelerating from this state, the wrapping radius of the belt 18 is changed to shift from the state of FIG. 5 to the state of FIG. At this time, the relationship between the speed ratio of the continuously variable transmission unit and the overall speed ratio is a solid line that goes up to the right in the range of mode 1 in FIG. On the other hand, although not involved in power transmission, the speed ratio between the input pulley 12 and the second output pulley 16 changes as indicated by the broken line.

At the highest speed side of the mode 1 range, the gear set of the multi-stage transmission unit is switched to the second speed gear set 36. In this switching operation, first, the gear 36 </ b> A is coupled to the second output pulley shaft 22 by the second gear switching mechanism 44. It is desirable that this coupling is completed in advance before reaching the highest speed side of the mode 1 range. Next, the intermediate shaft connected to the output shaft 48 is switched to the second intermediate shaft 34 by the output switching mechanism 46. By the switching operation of the output switching mechanism 46, the mode shifts to the mode 2 in which the second speed gear set 36 is selected in the multi-stage transmission unit. In the belt winding state, the shift up to the second speed gear set is performed in the state shown in FIG. 6, and it is not necessary to change the belt winding radius, so the shift up is completed in a short time.

  When the mode is switched, that is, when the upshifting is performed in the multi-stage transmission unit, it is desirable that the overall speed ratio before and after the same is matched. For this purpose, the product of the gear ratio of the first speed gear set 28 and the gear ratio of the continuously variable transmission when the first output pulley is at the highest speed, the gear ratio of the second speed gear set 36 and the It suffices if the product of the continuously variable transmission ratio when the two-output pulley is at the lowest speed side matches. In other words, each gear ratio is selected so as to be like that.

  In this way, if the overall gear ratio does not change before and after the upshifting, the switching operation in the output switching mechanism 46 can be shortened, and a stepless and smooth gear shifting is possible while ensuring a wide gear ratio range. Become.

  In mode 2, the second output pulley shaft 22 transmits power. As described above, with respect to the second output pulley shaft 22, the state shown in FIG. 6 is the low speed side, the state shown in FIG. 5 is the high speed side, and the state shown in FIG. 6 is shifted to the state shown in FIG. Acceleration is made. The speed ratio at this time is represented by a broken line in the range of mode 2 in FIG. As in the case of mode 1, the speed ratio applied to the first output pulley shaft on the side not involved in transmission is represented by a solid line.

  When the speed becomes the highest in the range of mode 2, switching to the third speed gear set 30 is performed. The gear 30 </ b> A is coupled to the first output pulley shaft 20 by the first gear switching mechanism 40. It is desirable that this is also completed in advance before becoming the fastest side of mode 2. When switching to the third gear set 30 is performed by the first gear switching mechanism 40, the first intermediate shaft 26 is then connected to the output shaft 48 by the output switching mechanism 46. By this switching operation, the mode shifts to mode 3 in which the third speed gear set 30 is selected in the multi-stage transmission unit. Also, it is preferable to set the gear ratio of each part so that the overall speed ratio does not change before and after the transition to mode 3.

  The continuously variable transmission at the time of transition to mode 3 is in the state shown in FIG. 5, and the first output pulley shaft 20 is in the low speed state. Then, the mode 3 is shifted to the state on the high speed side in FIG. 6 and accelerated until the overall speed ratio becomes the highest speed side. The speed ratio at this time is indicated by a solid line rising to the right in the mode 3 range.

  Since the operation at the time of deceleration is completely opposite to that at the time of acceleration, the description is omitted.

  As described above, the gear sets can be continuously shifted from the low speed side on the two output pulley shafts 20 and 22 to continuously shift the speed. That is, by selecting the gear set to be selected next by the gear switching mechanisms 40 and 44 in advance, the shift up of the multi-stage transmission unit is completed only by the operation of the clutches 50 and 52 of the output switching mechanism 46. Also, it is necessary to synchronize the switching operation of the output switching mechanism 46 by setting each gear ratio so that the overall gear ratio does not change before and after the mode change, that is, before and after the gear change in the multi-stage transmission unit. In this way, a smooth transmission can be performed without any steps.

  The reverse gear set 42 is selected by the second gear switching mechanism 44. When the reverse gear 42A is coupled to the second output pulley shaft 22 by the second gear switching mechanism 44, power is transmitted to the first intermediate shaft 26 via the idle gear 42C meshing with the second output pulley shaft 22 and the gear 42B (28B). Further, it is sent to the output shaft 48 by the output switching mechanism 46. In the reverse gear set 42, the continuously variable transmission unit is on the low speed side in the state of FIG. 6 and on the high speed side in the state of FIG. 5, as with the second speed gear set 36.

  FIG. 8 is a diagram illustrating a schematic configuration of the transmission 110 according to the present embodiment. The same components as those of the transmission 10 described above are denoted by the same reference numerals, and the description thereof is omitted. Further, although not the same as the configuration of the transmission 10, the corresponding configuration will be described using a reference numeral obtained by adding 100 to the reference numerals used in the description of the transmission 10.

  The transmission 110 has the same configuration as that of the transmission 10 with respect to the configuration of the continuously variable transmission. The transmission is that the fourth speed is added in the multi-stage transmission and the layout is changed by this addition. This is a difference from 10. The configuration of the first gear transmission mechanism 32 of the multi-stage transmission unit is the same as that of the transmission 10 described above, but the second gear transmission mechanism 138 includes two gear sets 136 and 160 of the second speed and the fourth speed. The continuously variable transmission portion is disposed on the opposite side of the first gear transmission mechanism 32. This is located on the same side as the hydraulic chamber 21 of the first output pulley 14, which is advantageous in the axial length. Further, although the position of the reverse gear 42 itself is not changed, the switching mechanism 162 for selecting the reverse gear 42 is dedicated.

  The first intermediate shaft 126 extends through the hollow portion of the hollow second intermediate shaft 134 to the output switching mechanism 46. The second and fourth speed driven gears 136B and 160B are fixed on the hollow second intermediate shaft 134, and the second and fourth speed driving gears 136A and 160A are connected to the second output pulley. The shaft 22 is rotatably supported. One gear 136 </ b> A, 160 </ b> A is selected by the second gear switching mechanism 144 and coupled to the second output pulley shaft 22.

  Regarding the speed change operation, the multi-stage speed change portion is not basically different from the speed change device 10 up to the third speed, and the description thereof will be omitted.

  9 and 10 are diagrams showing a schematic configuration of the transmission 210 according to the present embodiment. The above-described transmissions 10 and 110 are configured such that power is first input to the continuously variable transmission unit, sent from the continuously variable transmission unit to the multi-stage transmission unit, and output, whereas the transmission 210 of this embodiment. Is different from the above in that it is input to the multi-stage transmission unit, shifted, and then sent to the continuously variable transmission unit. The power is input from the input shaft 212 and transmitted to the input switching mechanism 214. The input switching mechanism 214 selectively couples the input shaft 212 to one of the first intermediate shaft 216 and the second intermediate shaft 218 that are coaxially arranged. The input switching mechanism 214 connects the first clutch 220 and the second clutch 222. Have. By connecting the first clutch 220, the input shaft 212 and the first intermediate shaft 216 are coupled, and by connecting the second clutch 222, the input shaft 212 and the second intermediate shaft 218 are coupled.

  A first gear transmission mechanism 224 is connected to the first intermediate shaft 216, and a second gear transmission mechanism 226 is connected to the second intermediate shaft 218. These gear transmission mechanisms 224 and 226 have the same basic structure as the gear transmission mechanisms 32 and 36 of the transmission 10 described above, but have different gear ratios because their inputs and outputs are reversed. The first gear transmission mechanism 224 includes a first speed gear set 228 and a third speed gear set 230. The first speed gear set 228 is rotatably supported on a gear 228A fixed to the first intermediate shaft 216 and a first input pulley shaft 234 that is a shaft of a first input pulley 232 of a continuously variable transmission described later. Gear 228B included. The third speed gear set 230 also includes a gear 230A fixed to the first intermediate shaft 216 and a gear 230B rotatably supported on the first input pulley shaft 234. Selection of the first and third gear sets 228 and 230 is performed by the first gear switching mechanism 236. Similar to the first gear switching mechanism 40 of the transmission 10, the first gear switching mechanism 236 can adopt the same structure as a gear switching mechanism such as a constant mesh transmission.

  The second gear speed change mechanism 226 has a second speed gear set 238, and a gear 238A constituting the gear set is fixed to the second intermediate shaft 218, and the other gear 238B is a continuously variable transmission portion described later. The second input pulley 240 is rotatably supported on the second input pulley shaft 242. Second speed gear 238 </ b> B is selectively coupled to second input pulley shaft 242 by second gear switching mechanism 244. The second gear switching mechanism 244 can adopt the same structure as a gear switching mechanism such as a constantly meshing transmission as with the gear switching mechanisms described above.

  On the second input pulley shaft 242, a gear 246B constituting the reverse gear set 246 is rotatably supported. The reverse gear 246B meshes with the idle gear 246C, and the idle gear 246C further meshes with the first speed gear 228A. That is, the reverse gear set 246 includes a gear 246B, a gear 246C, and a first speed gear 228A. That is, the first speed gear 228A is also the reverse gear 246A. The selection of the reverse gear set 246 is performed by the second gear switching mechanism 246 shared with the second speed.

  On the first and second input pulley shafts 234 and 242, first and second input pulleys 232 and 240 having V-shaped grooves constituting a continuously variable transmission are provided. Similar to the first and second output pulleys of the transmission 10 described above, the two input pulleys 232 and 240 include a pair of pulley halves facing in the axial direction, and one of the pulley halves is axially driven by a hydraulic device. The width of the V-shaped groove can be changed by sliding. The continuously variable transmission includes an output pulley 248 that is another pulley having a V-shaped groove. The groove width of the output pulley 248 is fixed. The belt 252 is wound around the three pulleys 232, 240, and 248 (see FIG. 10), and by changing the groove width of the two input pulleys 240 and 248, the belt winding radius of these pulleys is increased. Thus, the transmission gear ratio between the first input pulley 232 and the output pulley 248 and the transmission gear ratio between the second input pulley and the output pulley 248 are continuously changed. An output gear 254 is fixed to the output shaft 254 to which the output pulley 248 is fixed. The output gear 254 meshes with the ring gear 258 of the differential device 256.

  The speed change operation of the speed change device 210 is basically the same as the operation of the speed change device 10 described above. That is, the mode corresponding to the gear set selected by the multi-stage transmission unit and the input switching mechanism 214 which is the input switching unit is determined, and the shifting within the mode is continuously performed by the continuously variable transmission unit. In the multi-stage transmission region, the gear sets are alternately arranged on the first and second gear transmission mechanisms 224 and 226 on the low speed side, thereby reducing the delay in the transmission operation caused by the switching operation of the gear switching mechanisms 236 and 244. To do. In addition, when the mode is switched, that is, before and after the gear set in the multi-stage transmission unit is switched, if the overall gear ratio of the multi-stage transmission unit and the continuously variable transmission unit matches, the time required for synchronization in the shift operation will be increased. It becomes unnecessary, and the time required for the shifting operation can be shortened.

  In the above embodiment, the description has been given of the configuration in which two gear sets are arranged in the first gear transmission mechanism and one or two gear groups are arranged in the second gear transmission mechanism to have three or four stages. However, the number of gear sets to be arranged is not limited to this, and the number of gear groups arranged in the first and second gear transmission mechanisms may be one by one. It is also possible to have three or more sets.

1 is a front view showing a schematic configuration of a transmission 10 according to an embodiment of the present invention. 1 is a side view showing a schematic configuration of a transmission 10. 3 is a side view showing a configuration of a continuously variable transmission portion of the transmission 10. FIG. 2 is a side view showing the configuration of a multi-stage transmission unit and an output switching unit of the transmission 10. FIG. It is operation | movement explanatory drawing of a continuously variable transmission part. It is operation | movement explanatory drawing of a continuously variable transmission part. It is a figure which shows the relationship between the comprehensive speed ratio of the transmission 10, and the speed ratio of a continuously variable transmission part. It is a side view which shows schematic structure of the transmission 110 concerning other embodiment of this invention. It is a side view which shows schematic structure of the transmission 210 concerning further another embodiment of this invention. 2 is a front view showing a schematic configuration of a transmission apparatus 210. FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Transmission device, 12 Input pulley (fixed groove width pulley), 14 1st output pulley (1st variable groove width pulley), 16 2nd output pulley (2nd variable groove width pulley), 18 belt, 20 1st output pulley Shaft, 22 second output pulley shaft, 24 input shaft, 26 first intermediate shaft, 32 first gear speed change mechanism, 34 second intermediate shaft, 38 second gear speed change mechanism, 46 output switching mechanism, 48 output shaft, 210 speed change Device, 212 input shaft, 214 input switching mechanism, 216 first intermediate shaft, 218 second intermediate shaft, 224 first gear transmission mechanism, 226 second gear transmission mechanism, 232 first input pulley (first variable groove width pulley) 240, second input pulley (second variable groove width pulley), 248 output pulley (fixed groove width pulley), 252 belt.

Claims (8)

An input pulley, a first output pulley and a second output pulley having a substantially V-shaped groove, and a first output pulley and a second output pulley so as to fit in the substantially V-shaped grooves of the first output pulley and the second output pulley And a belt wound around the input pulley, and the width ratio of the input pulley and the first output pulley and the speed ratio of the input pulley and the second output pulley are continuously changed by changing the substantially V-shaped groove width. A continuously variable transmission that can be changed;
A first transmission unit having at least one shift stage for transmitting the output of the first output pulley, and a second transmission unit having at least one shift stage for transmitting the output of the second output pulley; In order from the first gear, the first gear and the second gear are alternately provided with each gear, and the gear ratio is changed stepwise.
An output switching unit that selects and outputs one of the outputs of the first transmission unit and the second transmission unit;
Have
When one shift stage is selected in the multi-stage transmission section, the continuously variable transmission section changes the substantially V-shaped groove width to change the first transmission section or the second transmission section to which the input pulley and the selected shift stage belong. A gear ratio with the first output pulley or the second output pulley connected to the transmission unit is continuously changed to change the speed, and the output switching unit is a first transmission unit or a second transmission unit to which the selected gear stage belongs. Select and output
The shift from the selected shift stage to the adjacent shift stage is performed by selecting the adjacent shift stage in the first shift section to which the selected shift stage belongs or the other shift section that is not the second shift section, It is executed by selecting the other transmission unit by the output switching unit.
Transmission device. The transmission according to claim 1,
The gear ratio between the low-speed gear and the high-speed gear that are adjacent to each other in the multi-speed transmission section is the same as when the gear ratio of the continuously variable transmission section is set to the highest speed in the low-speed gear stage and in the high-speed gear stage. It is set so that the overall gear ratio when the gear ratio of the continuously variable transmission portion is at the lowest speed side is equal.
Transmission device. The transmission according to claim 1 or 2,
The first transmission unit and the second transmission unit each include a pair of gears that constitute one shift stage, which are respectively arranged on shafts arranged in parallel.
The output side shaft of the first transmission unit and the output side shaft of the second transmission unit are arranged to have a common axis.
Transmission device. The transmission according to claim 1 or 2,
The first transmission unit and the second transmission unit each include a pair of gears that constitute one shift stage, which are respectively arranged on shafts arranged in parallel.
A transmission in which an output-side shaft of the first transmission unit and an output-side shaft of the second transmission unit are arranged in duplicate. Output pulley, first input pulley and second input pulley having a substantially V-shaped groove, and first input pulley and second input pulley so as to fit in a substantially V-shaped groove of the first input pulley and the second input pulley And a belt wound around the output pulley, and by changing the substantially V-shaped groove width, the transmission gear ratio of the first input pulley and the output pulley and the transmission gear ratio of the second input pulley and the output pulley are continuously set. A continuously variable transmission that can be changed;
A first transmission unit having at least one shift stage for transmitting an input to the first input pulley, and a second transmission unit having at least one shift stage for transmitting an input to the second input pulley; In order from the first gear, the first gear and the second gear are alternately provided with each gear, and the gear ratio is changed stepwise.
An input switching unit for selecting and inputting one of the first transmission unit and the second transmission unit;
Have
When one shift stage is selected in the multi-stage transmission section, the continuously variable transmission section changes the substantially V-shaped groove width to change the first transmission section or the second transmission section to which the output pulley and the selected shift stage belong. The gear ratio is changed by continuously changing the gear ratio with the first input pulley or the second input pulley connected to the transmission unit, and the input switching unit is the first transmission unit or the second transmission unit to which the selected gear stage belongs. Select and enter
The shift from the selected shift stage to the adjacent shift stage is performed by selecting the adjacent shift stage in the first shift section to which the selected shift stage belongs or the other shift section that is not the second shift section, It is executed by selecting the other transmission unit by the input switching unit,
Transmission device. The transmission according to claim 5, wherein
  The gear ratio between the low-speed gear and the high-speed gear that are adjacent to each other in the multi-speed transmission section is the same as when the gear ratio of the continuously variable transmission section is set to the highest speed in the low-speed gear stage and in the high-speed gear stage. It is set so that the overall gear ratio when the gear ratio of the continuously variable transmission portion is at the lowest speed side is equal.
Transmission device. The transmission according to claim 5 or 6,
The first transmission unit and the second transmission unit each include a pair of gears that constitute one shift stage, which are respectively arranged on shafts arranged in parallel.
A transmission in which an input-side shaft of the first transmission unit and an input-side shaft of the second transmission unit are arranged with a common axis. The transmission according to claim 5 or 6,
The first transmission unit and the second transmission unit each include a pair of gears that constitute one shift stage, which are respectively arranged on shafts arranged in parallel.
The input side shaft of the first transmission unit and the input side shaft of the second transmission unit are arranged in a double manner.
Transmission device.

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