CN211715700U - Small-pulsation mechanical stepless speed change device - Google Patents

Abstract

A small pulsation mechanical stepless speed change device comprises a frame, a speed regulating mechanism, an input shaft, two planetary gear train transmission mechanisms, a spur gear, a spur gear II, an improved crank mechanism, an output mechanism, and an output shaft. The speed regulating mechanism is installed in the frame, and the control gear and the idler gear of the speed regulating mechanism are respectively meshed and connected with the sun expansion gears of the two planetary gear train transmission mechanisms, and the two planetary gear train transmission mechanisms are installed symmetrically. On the input shaft, the spur gears of the two planetary gear train transmission mechanisms are meshed with the spur gear I and the spur gear II respectively, and the spur gear I and the spur gear II are mounted on the two sides of the intermediate shaft of the improved crank mechanism through bearings. At one end, the improved crank mechanism is drive-connected with an output mechanism, and the output mechanism is mounted on the output shaft. The utility model realizes the stepless speed change by the combination of the improved crank mechanism and the rack and pinion, and is more stable and efficient than the traditional mechanical stepless speed change device, and the pulsation is smaller.

Description

A small pulsation mechanical stepless speed change device

technical field

The invention belongs to the technical field of continuously variable speed change, and in particular relates to a small pulsation degree mechanical stepless speed change device.

Background technique

The continuously variable transmission is a commonly used transmission in mechanical transmission systems. Through the gradual change of the transmission ratio, the normal operation of the machine under different working conditions can be realized and the efficiency of the machine can be improved. The existing mechanical continuously variable transmission mainly includes friction type, hydraulic type and pulsation type. Compared with other continuously variable transmissions, the pulsating continuously variable transmission can achieve a wider speed change range and more precise transmission. The large pulsation and unbalanced force seriously restrict the performance of the continuously variable transmission, resulting in its relatively weak bearing capacity and shock resistance. In order to make the speed change more stable, the patent with the publication number CN105276098B discloses a movable tooth continuously variable transmission device, the patent with the publication number CN105697708B discloses a new type of mechanical stepless speed change device, and the patent with the publication number CN110056634A discloses three The four-stage hydromechanical CVT of the planetary row, but the above-mentioned devices still have major deficiencies in the control of the pulsation degree, and the load-bearing torque and impact resistance of the device still need to be improved. Therefore, the development of mechanical CVT devices with high bearing capacity, stability and small pulsation has high engineering application value and practical significance.

SUMMARY OF THE INVENTION

Aiming at the problems existing in the above-mentioned prior art, the present invention provides a small pulsation degree mechanical continuously variable transmission device that is more stable, more efficient, and has strong impact resistance.

The technical solution adopted in the present invention is: a small pulsation mechanical stepless speed change device, comprising a frame 100, a speed regulating mechanism 200, an input shaft 300, two planetary gear train transmission mechanisms 400, a spur gear 1 500, a spur gear 2600. Improve the crank mechanism 700, the output mechanism 800, and the output shaft 900; the frame 100 is provided with a first set of mounting holes 101, a second set of mounting holes 102, a third set of mounting holes 103, and a fourth set of mounting holes Hole 104, fifth group of mounting holes 105, sixth group of mounting holes 106; the control gear 203 and idler gear 204 of the speed regulating mechanism 200 are meshed and connected with the sun expansion gears 410 of the two planetary gear train transmission mechanisms 400 respectively; The input shaft 300 is installed in the third set of installation holes 103 of the frame 100 through bearings; the two planetary gear train transmission mechanisms 400 are symmetrically installed on the input shaft 300, and the two planetary gear train transmission mechanisms 400 The spur gear 401 is meshed with the spur gear 1 500 and the spur gear 2 600 respectively; the spur gear 1 500 and the spur gear 2 600 are mounted on the two ends of the intermediate shaft 701 of the improved crank mechanism 700 through bearings; the The improved crank mechanism 700 is in a transmission connection with the output mechanism 800 ; the output mechanism 800 is installed on the output shaft 900 ; the output shaft 900 is installed in the fifth group of installation holes 105 of the frame 100 through bearings.

The speed regulating mechanism 200 includes a control shaft 201, an idler shaft 202, a control gear 203 and an idler 204; the control shaft 201 is mounted in the first set of mounting holes 101 of the frame 100 through bearings, and A control gear 203 is fixedly installed on the control shaft 201 ; the idler shaft 202 is installed in the second set of installation holes 102 of the frame 100 through bearings, and an idler 204 is fixedly installed on the idler shaft 202 ; The idler gear 204 is meshed with the control gear 203 .

The two planetary gear train transmission mechanisms 400 both include a cylindrical gear 401, a connecting ring 402, a planet carrier 403, an inner gear 404, a planetary gear 405, a planetary gear 2 406, a planetary gear 407, and a planetary gear 408. The sun gear 409, the sun expansion gear 410; the cylindrical gear 401 is mounted on the input shaft 300 through the bearing, and the cylindrical gear 401 is fixedly connected with the connecting ring 402 through the boss on its end surface; the connecting ring 402 is rotated and sleeved On the input shaft 300, and fixedly connected with the ring gear 404; the ring gear 404 is rotatably sleeved on the input shaft 300, and is connected with the first planetary gear 405, the second planetary gear 406, the third planetary gear 407, and the fourth planetary gear. 408 is internally meshed and connected; the planetary gear one 405, the planetary gear two 406, the planetary gear three 407, and the planetary gear four 408 are mounted on the planetary carrier 403; the planetary carrier 403 is fixedly mounted on the input shaft 300; the The sun gear 409 is mounted on the input shaft 300 through bearings, and is externally meshed with the planetary gear 1 405, the planetary gear 2 406, the planetary gear 3 407, and the planetary gear 408. The flange is fixedly connected with the boss on the end face of the sun expansion gear 410; the sun expansion gear 410 is mounted on the input shaft 300 through a bearing.

In the above-mentioned small-pulsation mechanical continuously variable transmission device, the tooth widths of the control gear 203 and the idler gear 204 of the speed regulating mechanism 200 are both the teeth of the sun expansion gear 410 of the two planetary gear train transmission mechanisms 400 . 2 times the width.

The improved crank mechanism 700 includes an intermediate shaft 701, a variable diameter roller 702, a rack 1 703, a pinion 1 704, a rack 2 705, and a pinion 2 706; the intermediate shaft 701 is mounted on the frame 100 through a bearing. In the fourth group of mounting holes 104 of the first set of mounting holes; the pinion one 704 is mounted on the intermediate shaft 701 through the bearing; the diameter-reducing roller 702 is provided with a straight slot 7020 in the diameter direction, and the diameter-reducing roller 702 passes through the straight slot. The 7020 is rotatably sleeved on the intermediate shaft 701, and the two ends of the variable diameter roller 702 are symmetrically provided with a mounting platform 7021 and a second mounting platform 7022 along the direction of the straight slot 7020; the mounting platform 7021 of the variable diameter roller 702 is fixedly installed on There is a rack one 703; the rack one 703 is meshed with the pinion one 704; the pinion one 704 is provided with a flange on one end surface, which is fixedly connected with the spur gear one 500; the installation platform two 7022 The second rack 705 is fixedly installed on it; the second rack 705 is meshed with the second pinion 706 ; the second pinion 706 is provided with a flange on one end surface, which is fixedly connected with the second spur gear 600 .

The output mechanism 800 includes a bracket 801, a horizontal moving frame 802, a spring 1 803, a spring 2 804, an output rack 1 805, an output rack 2 806, an output gear 1 807, an output gear 2 808 and an overrunning clutch 809; The bracket 801 is fixedly installed on the bottom surface of the rack 100; the bracket 801 is slidably installed with a horizontal moving frame 802; And the horizontal moving frame 802 is provided with a horizontal installation slot 8020 and a horizontal guide rod 1 8021 and a guide rod 2 8022; the guide rod 1 8021 and the guide rod 2 8022 of the horizontal moving frame 802 are respectively sleeved with springs. The first 803 and the second spring 804, and the ends of the guide rod 1 8021 and the guide rod 2 8022 of the horizontal moving frame 802 pass through the sixth group of installation holes 106 opened on the rack 100; the installation groove 8020 of the horizontal moving frame 802 An output rack 1 805 and an output rack 2 806 are installed on the upper and lower ends of the gear box, and the two are arranged in a relative dislocation; the output rack 1 805 is meshed with the output gear 1 807; the output rack 2 806 It is meshed with the second output gear 808 , and the first output gear 807 and the second output gear 808 are both installed on the output shaft 900 through the overrunning clutch 809 .

The beneficial effects of the present invention are as follows: the present invention adopts the combination of improved crank mechanism and gear rack meshing output to realize stepless speed change, which is more stable, more efficient, and less pulsating than the traditional mechanical stepless speed change device. The gear tooth meshing transmission is mostly used, which can transmit a large torque and improve the transmission precision, and the motion conversion part has small impact and low noise, and the utility model also has the advantages of simple structure, low production cost and high reliability.

Description of drawings

Fig. 1 is the top view of the present utility model;

Fig. 2 is the structural diagram of the utility model dismantling the rack;

Fig. 3 is the disassembled structure diagram of the planetary gear train transmission mechanism of the present invention;

Fig. 4 is the structural diagram of the improved crank mechanism of the present utility model;

Fig. 5 is the structure diagram of the output mechanism dismantling support of the present utility model;

Fig. 6 is the structure diagram of the rack of the present utility model;

Fig. 7 is the connection structure diagram of the improved crank mechanism of the present invention and the output mechanism;

Among them: 100-frame; 200-speed regulating mechanism; 201-control shaft; 202-idler shaft; 203-control gear; 204-idler; 300-input shaft; 400-planetary gear train transmission mechanism; 401-cylindrical gear 402-connecting ring; 403-planet carrier; 404-ring gear; 405-planet gear one; 406-planet gear two; 407-planet gear three; 408-planet gear four; 409-sun gear; 410-sun expansion Gear; 500-spur gear one; 600-spur gear two; 700-improved crank mechanism; 701-intermediate shaft; 702-reducer roller; 7020-straight notch; -Rack one; 704-pinion one; 705-rack two; 706-pinion two; 800-output mechanism; 801-bracket; 802-horizontal moving frame; 8020-installation slot; -Guide rod two; 803-spring one; 804-spring two; 805-output rack one; 806-output rack two; 807-output gear one; 808-output gear two; 809-overrunning clutch; 900-output shaft .

Detailed ways

As shown in Figures 1 to 7, a small pulsation mechanical continuously variable transmission device includes a frame 100, a speed regulating mechanism 200, an input shaft 300, two planetary gear train transmission mechanisms 400, a spur gear 500, a spur gear 2600. Improve the crank mechanism 700, the output mechanism 800, and the output shaft 900; the frame 100 is provided with a first set of mounting holes 101, a second set of mounting holes 102, a third set of mounting holes 103, and a fourth set of mounting holes hole 104, fifth group of mounting holes 105, sixth group of mounting holes 106; the control gear 203 and idler gear 204 of the speed regulating mechanism 200 are respectively meshed with the sun expansion gears 410 of the two planetary gear train transmission mechanisms 400; The input shaft 300 is installed in the third group of installation holes 103 of the frame 100 through bearings; the two planetary gear train transmission mechanisms 400 are symmetrically installed on the input shaft 300, and the two planetary gear train transmission mechanisms 400 are mounted on the input shaft 300 symmetrically. The spur gear 401 meshes with the spur gear 1 500 and the spur gear 2 600 respectively; the spur gear 1 500 and the spur gear 2 600 are mounted on the two ends of the intermediate shaft 701 of the improved crank mechanism 700 through bearings; the improved crank mechanism The mechanism 700 is in driving connection with the output mechanism 800 ; the output mechanism 800 is installed on the output shaft 900 ; the output shaft 900 is installed in the fifth group of installation holes 105 of the frame 100 through bearings.

The speed regulating mechanism 200 includes a control shaft 201, an idler shaft 202, a control gear 203 and an idler 204; the control shaft 201 is mounted in the first set of mounting holes 101 of the frame 100 through bearings, and A control gear 203 is installed on the control shaft 201 through a flat key; the idler shaft 202 is installed in the second set of installation holes 102 of the frame 100 through a bearing, and the idler shaft 202 is installed through a flat key There is an idler gear 204; the half of the tooth width of the idler gear 204 meshes with the half of the tooth width of the control gear 203.

The two planetary gear train transmission mechanisms 400 both include a cylindrical gear 401, a connecting ring 402, a planet carrier 403, an inner gear 404, a planetary gear 405, a planetary gear 2 406, a planetary gear 407, and a planetary gear 408. The sun gear 409, the sun expansion gear 410; the cylindrical gear 401 is mounted on the input shaft 300 through the bearing, and the cylindrical gear 401 is fixed on one end face of the connecting ring 402 with screws through the boss on its end face; the connecting ring 402 is rotatably sleeved on the input shaft 300, and the other end face is fixedly connected with the ring gear 404 through screws; the ring gear 404 is rotatably sleeved on the input shaft 300, and is connected with the first planetary gear 405, the second planetary gear 406, The third planetary wheel 407 and the fourth planetary wheel 408 are meshed internally; the first planetary wheel 405, the second planetary wheel 406, the third planetary wheel 407, and the fourth planetary wheel 408 are installed on the planetary carrier 403; Installed on the input shaft 300; the sun gear 409 is installed on the input shaft 300 through a bearing, and meshes with the first planetary gear 405, the second planetary gear 406, the third planetary gear 407, and the fourth planetary gear 408, and the sun gear The flange on the end face of the wheel 409 is fixed to the boss on the end face of the sun expansion gear 410 through screws; the sun expansion gear 410 is mounted on the input shaft 300 through a bearing.

The tooth widths of the control gear 203 and the idler gear 204 of the speed regulating mechanism 200 are both twice the tooth width of the sun extension gear 410 of the two planetary gear train transmission mechanisms 400, and the tooth width of the control gear 203 is half of the tooth width. It meshes with the sun expansion gear 410 in the horizontal direction, half of the tooth width of the idler gear 204 meshes with the sun expansion gear 410 in the horizontal direction, and the other half of the tooth width of the control gear 203 meshes with the other half of the tooth width of the idler gear 204 in the vertical direction.

The improved crank mechanism 700 includes an intermediate shaft 701, a variable diameter roller 702, a rack 1 703, a pinion 1 704, a rack 2 705, and a pinion 2 706; the intermediate shaft 701 is mounted on the frame 100 through a bearing. In the fourth group of mounting holes 104 of the first set of mounting holes; the pinion one 704 is mounted on the intermediate shaft 701 through the bearing; the diameter-reducing roller 702 is provided with a straight slot 7020 in the diameter direction, and the diameter-reducing roller 702 passes through the straight slot. The 7020 is rotatably sleeved on the intermediate shaft 701, and the two ends of the variable diameter roller 702 are symmetrically provided with a mounting platform 7021 and a second mounting platform 7022 along the direction of the straight notch 7020; the mounting platform 1 7021 of the variable diameter roller 702 is provided with screws. A rack 1 703 is installed; the rack 1 703 meshes with the pinion 1 704; the pinion 1 704 is provided with a flange on one end surface, which is fixed with the spur gear 1 500 by screws; the installation table 2 The second rack 705 is installed on the 7022 by screws; the second rack 705 is meshed with the second pinion 706 ; one end of the second pinion 706 is provided with a flange, which is fixed with the second spur gear 600 by screws.

The output mechanism 800 includes a bracket 801, a horizontal moving frame 802, a spring 1 803, a spring 2 804, an output rack 1 805, an output rack 2 806, an output gear 1 807, an output gear 2 808 and an overrunning clutch 809; The bracket 801 is installed on the bottom surface of the frame 100 by screws; the bracket 801 is slidably installed with a horizontal moving frame 802; the horizontal moving frame 802 contacts the variable diameter roller 702 of the improved crank mechanism 700 for transmission , and the horizontal moving frame 802 is provided with a horizontal installation groove 8020 and a horizontal guide rod 1 8021 and guide rod two 8022; the guide rod one 8021 and guide rod two 8022 of the horizontal moving frame 802 are respectively sleeved with The first spring 803 and the second spring 804, and the ends of the guide rod 1 8021 and the guide rod 2 8022 of the horizontal moving frame 802 pass through the sixth group of installation holes 106 opened on the rack 100; the installation groove 8020 of the horizontal moving frame 802 The inner upper and lower ends are fixed with an output rack 1 805 and an output rack 2 806 by screws, and the two are installed in a relative dislocation; the output rack 1 805 meshes with the output gear 1 807; the output rack The second 806 meshes with the second output gear 808 , and the first output gear 807 and the second output gear 808 are both mounted on the output shaft 900 through the overrunning clutch 809 .

The overrunning clutch 809 is in the prior art.

When the utility model works, the input shaft 100 rotates at a constant speed, and drives the planet carriers 403 of the two symmetrically installed planetary gear train transmission mechanisms 400 to rotate at a constant speed, and then drives the first planetary gear 405, the second planetary gear 406, the third planetary gear 407, and the planetary gear. Four 408, rotate around the sun gear 409, then drive the inner gear 404, the connecting ring 402 and the cylindrical gear 401 to rotate at a constant speed, drive the spur gear 1 500 and the spur gear 2 600 to rotate in the same direction and speed, and then make the pinion 1 704 and the small The second gear 706 rotates in the same direction and the same speed, thereby driving the variable diameter roller 702 to rotate at a constant speed, and then driving the horizontal moving frame 802 to realize horizontal reciprocating motion under the action of the spring one 803 and the spring two 804, so that the output rack one 805 and the output rack The second 806 drives the meshed output gear 1 807 and the output gear 2 808 respectively to reciprocate and rotate. Since the symmetrically installed overrunning clutch 809 has the effect of one-way thrust, the movement of the output shaft 900 is a stable one-way rotational movement.

The speed change principle of the present invention is as follows: by driving the rotation of the control gear 203, the idler gear 204 is driven to rotate, and the two sun expansion gears 410 are driven to rotate in opposite directions to each other, thereby realizing the differential transmission of the two planetary gear train transmission mechanisms 400, so that the The two cylindrical gears 401 rotate in the same direction and at different speeds, thereby driving the first spur gear 500 and the second spur gear 600 to rotate in the same direction and different speeds, so that the first pinion 704 and the second pinion 706 rotate in the same direction and different speeds. Rack one 703, pinion two 706 and rack two 705 are unilaterally meshed, so as to adjust the distance a (0~x) from the periphery of the variable diameter roller 702 to the intermediate shaft 701, that is, adjust the size of the crank, so that the circumference of the variable diameter roller 702 is adjusted. The linear speed of the movement is changed, so that the speed of the horizontal reciprocating linear movement of the horizontal moving frame 802 is changed, thereby realizing the stepless speed change of the output shaft 900 .

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. For those skilled in the art, the present utility model may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims (6)

1. A small pulsation degree mechanical continuously variable speed change device, characterized in that: it comprises a frame (100), a speed regulating mechanism (200), an input shaft (300), two planetary gear train transmission mechanisms (400), a spur gear One (500), two spur gears (600), improved crank mechanism (700), output mechanism (800), output shaft (900); the frame (100) is provided with a first group of mounting holes (101) , the second group of installation holes (102), the third group of installation holes (103), the fourth group of installation holes (104), the fifth group of installation holes (105), and the sixth group of installation holes (106); The control gear (203) and the idler gear (204) of the speed mechanism (200) are meshed and connected with the sun expansion gears (410) of the two planetary gear train transmission mechanisms (400) respectively; the input shaft (300) is installed through bearings In the third set of mounting holes (103) of the frame (100); the two planetary gear train transmission mechanisms (400) are symmetrically mounted on the input shaft (300), and the two planetary gear train transmission mechanisms (400) ) of the spur gear (401) is meshed with the spur gear one (500) and spur gear two (600) respectively; the spur gear one (500) and spur gear two (600) are installed on the improved crank mechanism (700) through bearings ) of the two ends of the intermediate shaft (701); the improved crank mechanism (700) is in driving connection with the output mechanism (800); The output shaft (900) is mounted in the fifth set of mounting holes (105) of the frame (100) through bearings. 2. A small-pulsation mechanical continuously variable transmission device according to claim 1, characterized in that: the speed regulating mechanism (200) comprises a control shaft (201), an idler shaft (202), a control gear (203) ) and an idler (204); the control shaft (201) is installed in the first set of mounting holes (101) of the frame (100) through bearings, and the control shaft (201) is fixedly mounted with a control Gear (203); the idler shaft (202) is installed in the second set of mounting holes (102) of the frame (100) through bearings, and the idler shaft (202) is fixedly mounted with an idler wheel (204); the idler wheel (204) is meshed with the control gear (203). 3. A small pulsation degree mechanical continuously variable transmission device according to claim 1, characterized in that: said two planetary gear train transmission mechanisms (400) both comprise a cylindrical gear (401), a connecting ring (402) , planet carrier (403), ring gear (404), planet gear one (405), planet gear two (406), planet gear three (407), planet gear four (408), sun gear (409), sun expansion Gear (410); the cylindrical gear (401) is mounted on the input shaft (300) through a bearing, and the cylindrical gear (401) is fixedly connected to the connecting ring (402) through the boss on its end surface; the connection The ring (402) is rotatably sleeved on the input shaft (300), and is fixedly connected with the ring gear (404); the ring gear (404) is rotatably sleeved on the input shaft (300), and is connected to the planetary gear (404). 405), the second planetary wheel (406), the third planetary wheel (407), and the fourth planetary wheel (408) are meshed and connected; the first planetary wheel (405), the second planetary wheel (406), and the third planetary wheel (407) , the fourth planetary gear (408) is mounted on the planet carrier (403); the planet carrier (403) is fixedly mounted on the input shaft (300); the sun gear (409) is mounted on the input shaft (300) through a bearing ), it is externally meshed with planetary gear one (405), planetary gear two (406), planetary gear three (407), and planetary gear four (408), and the sun gear (409) is arranged through its end face. The flange is fixedly connected with the boss on the end face of the sun expansion gear (410); the sun expansion gear (410) is mounted on the input shaft (300) through a bearing. 4. A small-pulsation mechanical continuously variable transmission device according to claim 2 or 3, characterized in that: the tooth width of the control gear (203) and the idler gear (204) of the speed regulating mechanism (200) Both are twice the tooth width of the sun expansion gears (410) of the two planetary gear train transmission mechanisms (400). 5. A small pulsation mechanical continuously variable transmission device according to claim 1, characterized in that: the improved crank mechanism (700) comprises an intermediate shaft (701), a diameter reducing roller (702), a rack (703), a first pinion (704), a second rack (705), and a second pinion (706); the intermediate shaft (701) is mounted on the fourth set of mounting holes (104) of the frame (100) through bearings ); the pinion gear one (704) is mounted on the intermediate shaft (701) through a bearing; the diameter-reducing roller (702) is provided with a straight slot (7020) in the diameter direction, and the diameter-reducing roller (702) The straight notch (7020) is rotatably sleeved on the intermediate shaft (701), and the two ends of the reducing roller (702) are symmetrically provided with a mounting table (7021) and a second mounting table (7022) along the direction of the straight notch (7020). ; a rack one (703) is fixedly installed on the mounting table one (7021) of the variable diameter roller (702); the rack one (703) is meshed and connected with the pinion one (704); the One end face of the pinion gear one (704) is provided with a flange, which is fixedly connected with the spur gear one (500). 705) is meshed and connected with the second pinion gear (706); one end surface of the second pinion gear (706) is provided with a flange, which is fixedly connected with the second spur gear (600). 6. A small pulsation degree mechanical continuously variable transmission device according to claim 1, characterized in that: the output mechanism (800) comprises a bracket (801), a horizontal moving frame (802), a spring one (803) , spring two (804), output rack one (805), output rack two (806), output gear one (807), output gear two (808) and overrunning clutch (809); the bracket (801) It is fixedly installed on the bottom surface of the frame (100); a horizontal moving frame (802) is slidably installed in the bracket (801); the change between the horizontal moving frame (802) and the improved crank mechanism (700) The radial roller (702) is connected by transmission, and the horizontal moving frame (802) is provided with a horizontal mounting groove (8020) and a horizontal guide rod one (8021) and guide rod two (8022); the horizontal moving frame Guide rod one (8021) and guide rod two (8022) of (802) are respectively sheathed with spring one (803) and spring two (804), and guide rod one (8021) and guide rod of the horizontal moving frame (802) The two (8022) ends pass through the sixth group of mounting holes (106) opened on the frame (100); the upper and lower ends of the mounting groove (8020) of the horizontal moving frame (802) are provided with an output rack. (805) and the second output rack (806), and the two are relatively dislocated before and after; the first output rack (805) is meshed with the first output gear (807); the second output rack (806) It is meshed with the second output gear (808), and the first output gear (807) and the second output gear (808) are installed on the output shaft (900) through the overrunning clutch (809).

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