Self-adjusting stepless speed change transmission case

Abstract

The utility model discloses a self-adjusting stepless speed change transmission case which comprises a case body, an input shaft component, a planet carrier component, a gear ring component and an output shaft component, the input shaft component, the planet carrier component, the gear ring component and the output shaft component are arranged in the case body and are in transmission connection in sequence, and the self-adjusting stepless speed change transmission case further comprises a belt pulley component arranged in the case body. The belt pulley component comprises a belt, a spring seat, a first spring, a left cam, a right cam, a left belt pulley and a right belt pulley, the right cam is fixedly connected with the left belt pulley, the left cam is fixedly connected with the right belt pulley, the spring seat is fixedly connected with the left cam, the first spring is mounted between the spring seat and the left belt pulley, and the belt is mounted on the left belt pulley and the right belt pulley; and the right belt pulley is fixedly connected with an input shaft in the input shaft component. According to the scheme, through the structural arrangement of the two belt pulleys and the two cams, the positions of the belt pulleys are automatically adjusted, the rotating diameter of the belt is changed according to the load, and therefore the speed reduction ratio is adjusted, and stepless speed change transmission is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of power transmission of agricultural machinery, in particular to a self-adjusting continuously variable speed transmission box. Background Art

[0002] With the continuous development of technology, agricultural machinery operators have higher and higher requirements for the fuel economy, operating comfort and convenience of agricultural machinery, and the demand for continuously variable transmission boxes in the field of agricultural machinery is increasing. At present, the main form of continuously variable transmission in China is torque converter, but its structure is complex, costly and has low transmission efficiency. In actual production, pulleys can also achieve continuously variable speed, but they do not have the speed adjustment function without changing the pulley diameter.

[0003] In addition, as the functions of agricultural machinery are increasing, agricultural machinery transmission boxes are usually required to have both forward and reverse gear functions. At present, agricultural machinery transmission boxes produced domestically generally use the form of adding an idler wheel to achieve the reverse gear function, but this form requires a lot of space in the agricultural machinery frame and has great limitations on the reduction ratio. Based on the above situation, ordinary transmission boxes are gradually being eliminated because they cannot meet the requirements of agricultural machinery use such as high efficiency, energy saving, and convenience. Utility Model Content

[0004] In order to solve the above technical problems, the purpose of the utility model is to provide a self-adjusting continuously variable transmission box with simple structure, high reliability and both forward gear and reverse gear.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0006] A self-adjusting continuously variable transmission box comprises a box body and an input shaft component, a planetary carrier component, a ring gear component and an output shaft component which are arranged in the box body and are connected in sequence, and also comprises a pulley component arranged in the box body, power is transmitted to the input shaft component through the pulley component, the pulley component comprises a belt, a spring seat, a first spring, a left cam, a right cam, a left pulley and a right pulley, the right cam is fixedly connected to the left pulley, the left cam is fixedly connected to the right pulley, the spring seat is fixedly connected to the left cam, the first spring is installed between the spring seat and the left pulley, the belt is installed on the left pulley and the right pulley, the left pulley and the right pulley are separated from each other and maintain a certain distance; the right pulley is fixedly connected to the input shaft in the input shaft component. When the belt input torque and load are unbalanced, the left pulley and the right pulley rotate relative to each other. Since the left pulley is fixedly connected to the right cam and the right pulley is fixedly connected to the left cam, when the two rotate relative to each other, under the action of the two cams, the pulleys separate or approach each other along the cam contour trajectory, thereby changing the belt rotation diameter and realizing stepless change of the transmission speed ratio.

[0007] Preferably, the spring seat is fixedly connected to the left cam via a first rivet.

[0008] Preferably, the input shaft component includes an input shaft and an input shaft cover plate, the input shaft cover plate is fixedly sleeved on the input shaft through a second bearing, the planetary carrier component includes a planetary carrier, a planetary shaft and a planetary gear, the planetary carrier is fixedly connected to the housing, the planetary gear is mounted on the planetary carrier through the planetary shaft, the planetary gear is meshed with the toothed portion on the input shaft, the ring gear component includes a ring gear connecting plate and a ring gear, the ring gear is fixedly connected to the ring gear connecting plate, the output shaft component includes an output sun gear, a shift gear sleeve and an output shaft, the output sun gear is arranged on the output shaft, the shift gear sleeve is mounted on the output shaft in a circumferentially fixed and axially movable manner so that the shift gear sleeve is connected to the output sun gear or the ring gear connecting plate, the planetary gear is meshed with the output sun gear and the ring gear at the same time, the left side of the output shaft is penetrated into the input shaft through a first bearing and a third bearing, the left end of the output shaft extends out of the input shaft, and the right end of the output shaft extends out of the housing.

[0009] Preferably, the gear ring is fixedly connected to the gear ring connecting plate by rivets.

[0010] Preferably, when the shift sleeve moves to the left end position, the external splines on the output sun gear engage with the internal splines of the shift sleeve; when the shift sleeve moves to the right end position, the internal splines on the ring gear connecting plate engage with the external splines of the shift sleeve.

[0011] As a preference, it also includes an operating component, which includes a shift fork, a fork shaft, a piston, a second spring and a cylinder cover. The cylinder cover is fixedly connected to the housing to form a cavity for placing the piston and the second spring. The two ends of the second spring are respectively against the piston and the cylinder cover. The piston is fixedly connected to the fork shaft. One end of the fork shaft extends into the housing and is fixedly connected to the shift fork. The shift fork is fixedly connected to the shift gear sleeve. When the hydraulic oil does not enter the cavity, the piston moves to the left under the action of the second spring, the fork shaft and the shift fork push the shift gear sleeve to move to the left, and the external spline on the output sun gear is combined with the internal spline of the shift gear sleeve to achieve the forward output of power; when the hydraulic oil enters the cavity, the piston moves to the right under the action of the oil pressure, the fork shaft and the shift fork push the shift gear sleeve to move to the right, and the internal spline on the gear ring connecting plate is combined with the external spline of the shift gear sleeve to achieve the reverse output of power.

[0012] Preferably, the shift fork is embedded in an annular groove on the shift gear sleeve so as to be fixedly connected to the shift gear sleeve.

[0013] Preferably, the right side of the output shaft is supported on the housing through a fifth bearing.

[0014] Preferably, the second bearing and the fifth bearing are deep groove ball bearings, and the first bearing and the third bearing are needle roller bearings.

[0015] Preferably, the planet carrier component further comprises steel balls, and the planet shaft and the planet carrier are limited by the steel balls.

[0016] Due to the adoption of the above technical scheme, the utility model has the following beneficial effects: the utility model is a self-adjusting continuously variable transmission box designed for the working conditions of agricultural machinery. Through the structural arrangement of two pulleys and two cams, when the transmission box inputs power from the right pulley, it automatically adjusts the position of the pulley according to the load size, changes the belt rotation diameter, and thus adjusts the reduction ratio until the input torque is balanced with the load, thereby realizing continuously variable transmission; in the utility model, the shift fork is driven by hydraulic oil to shift gears, thereby realizing the conversion between forward gear and reverse gear. The utility model has the characteristics of reasonable structure, easy use, reliability, compact space, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the transmission structure of the utility model;

[0018] Figure 2 It is a schematic diagram of the structure of the pulley component in the utility model;

[0019] Figure 3 This is a schematic diagram of the structure of the input shaft component in the utility model;

[0020] Figure 4 This is a schematic diagram of the structure of the planet carrier component in the utility model;

[0021] Figure 5 This is a schematic diagram of the structure of the ring gear component in the utility model;

[0022] Figure 6 This is a schematic diagram of the structure of the output shaft component in the utility model;

[0023] Figure 7 It is a schematic diagram of the structure of the operating components in the utility model.

[0024] Reference numerals:

[0025] 1. Box body;

[0026] 100, pulley component; 11, spring seat; 12, first rivet; 13, first spring; 14, left cam; 15, right cam; 16, left pulley; 17, right pulley;

[0027] 200, input shaft component; 21, input shaft; 22, first bearing; 23, input shaft cover; 24, second bearing; 25, third bearing;

[0028] 300, planet carrier component; 31, planet carrier; 32, steel ball; 33, planet shaft; 34, fourth bearing; 35, planet gear;

[0029] 400, gear ring component; 41, gear ring connecting plate; 42, second rivet; 43, gear ring;

[0030] 500, output shaft component; 51, output sun gear; 52, shift gear sleeve; 53, fifth bearing; 54, output shaft;

[0031] 600, operating component; 61, shift fork; 62, fork shaft; 63, piston; 64, second spring; 65, cylinder head. DETAILED DESCRIPTION

[0032] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0035] like Figures 1 to 7The self-adjusting continuously variable transmission case shown in the figure comprises a case body 1 and an input shaft component 200, a planetary carrier component 300, a ring gear component 400 and an output shaft component 500 which are arranged in the case body 1 and are sequentially connected in transmission, and also comprises a pulley component 100 arranged in the case body 1, through which power is transmitted to the input shaft component 200, and the pulley component 100 comprises a belt, a spring seat 11, a first spring 13, a left cam 14, a right cam 15, a left pulley 16 and a right pulley 17, wherein the right cam 15 is fixedly connected to the left pulley 16, and the left cam 14 is fixedly connected to the right pulley 17. 7 is fixedly connected, the spring seat 11 is fixedly connected to the left cam 14 through the first rivet 12, the first spring 13 is installed between the spring seat 11 and the left pulley 16, and has a certain preload force, before the belt is installed, the left pulley 16 is close to the right pulley 17 under the action of the preload force of the first spring 13, the belt is installed on the left pulley 16 and the right pulley 17, after the belt is installed, the belt tension is balanced with the preload force of the first spring 13, the left pulley 16 and the right pulley 17 are separated from each other and keep a certain distance; the right pulley 17 is fixedly connected to the input shaft 21 in the input shaft component 200.

[0036] In this way, when the belt input torque is sufficient to drive the load, the left pulley 16 and the right pulley 17 rotate at the same speed, and the power passes through the pulley component 100, the input shaft component 200, and the planetary carrier component 300 in sequence until it is transmitted to the output shaft 54 ​​for output. When the belt input torque is less than the torque required by the load, the belt input torque loses balance with the load. At this time, the left pulley 16 rotates at the same speed as the belt, the right pulley 17 slips with the belt, and the left pulley 16 and the right pulley 17 rotate relative to each other. Since the left pulley 16 is fixedly connected to the right cam 15 and the right pulley 17 is fixedly connected to the left cam 14, when the two rotate relative to each other, under the action of the left cam 14 and the right cam 15, the pulleys separate from each other along the cam profile trajectory, the belt moves closer to the rotation center, the belt rotation diameter decreases, the belt transmission reduction ratio increases, and the input torque increases accordingly, until the input torque is balanced with the load, the left pulley 16 and the right pulley 17 rotate at the same speed, completing the stepless speed change process. Similarly, when the belt input torque is greater than the torque required by the load, the left pulley 16 and the right pulley 17 rotate relative to each other. At this time, under the action of the left cam 14 and the right cam 15, the left pulley 16 and the right pulley 17 approach each other, and the belt gradually moves away from the rotation center, the belt rotation diameter decreases, the belt drive reduction ratio decreases, and the input torque decreases accordingly. After the input torque is balanced with the load, the left pulley 16 and the right pulley 17 rotate at the same speed to complete the stepless speed change process.

[0037] like Figures 1 to 6As shown, the input shaft component 200 includes an input shaft 21 and an input shaft cover plate 23, the input shaft cover plate 23 is fixedly sleeved on the input shaft 21 through a second bearing 24, the planetary carrier component 300 includes a planetary carrier 31, a planetary shaft 33 and a planetary gear 35, the planetary carrier 31 is fixedly connected to the housing 1, the planetary gear 35 is installed on the planetary carrier 31 through the planetary shaft 33, and the planetary gear 35 is meshed with the toothed portion on the input shaft 21, the ring gear component 400 includes a ring gear connecting plate 41 and a ring gear 43, the ring gear 43 is fixedly connected to the ring gear connecting plate 41 through a rivet 42, and the output shaft component 500 includes an output sun gear 51, a shift gear sleeve 52 and an output shaft 54, The output sun gear 51 is arranged on the output shaft 54, and the shift sleeve 52 is installed on the output shaft 54 ​​in a circumferentially fixed and axially movable manner so that the shift sleeve 52 is connected to the output sun gear 51 or the ring gear connecting plate 41. In the utility model, the shift sleeve 52 is splined and arranged on the output shaft 54, and the planetary gear 35 is meshed with the output sun gear 51 and the ring gear 43 at the same time. The left side of the output shaft 54 ​​is penetrated in the input shaft 21 through the first bearing 22 and the third bearing 25, and the left end of the output shaft 54 ​​extends out of the input shaft 21. The right side of the output shaft 54 ​​is supported on the housing 1 through the fifth bearing 53, and the right end of the output shaft 54 ​​extends out of the housing 1.

[0038] When the shift sleeve 52 moves to the left end position, the outer spline on the output sun gear 51 combines with the inner spline of the shift sleeve 52 to achieve forward power output; when the shift sleeve 52 moves to the right end position, the inner spline on the ring gear connecting plate 41 combines with the outer spline of the shift sleeve 52 to achieve reverse power output.

[0039] like Figure 4 As shown, the planet carrier component 300 further includes a steel ball 32 , and the planet shaft 33 and the planet carrier 31 are limited by the steel ball 32 .

[0040] The utility model adopts an external oil circuit to control the engagement of the shift gear sleeve 52, such as Figure 1 and Figure 7 As shown, it also includes an operating component 600, which includes a shift fork 61, a fork shaft 62, a piston 63, a second spring 64 and a cylinder cover 65. The cylinder cover 65 is fixedly connected to the housing 1 to form a cavity for accommodating the piston 63 and the second spring 64. The two ends of the second spring 64 are respectively against the piston 63 and the cylinder cover 65. The piston 63 is fixedly connected to the fork shaft 62. One end of the fork shaft 62 extends into the housing 1 and is fixedly connected to the shift fork 61. The shift fork 61 is fixedly connected to the shift gear sleeve 52.

[0041] After the external pressure oil is connected, the piston 63 moves to the right under the action of the oil pressure, thereby driving the fork shaft 62 and the shift fork 61 to move to the right, so that the shift sleeve 52 moves to the right. The shift sleeve 52 is provided with an external spline. After moving to the extreme position, the sliding shift sleeve 52 is connected to the ring gear connecting plate 41 through the spline. The power is transmitted from the ring gear 43, the ring gear connecting plate 41, and the shift sleeve 52 to the output shaft 54 ​​in sequence, completing the power output under the reverse gear condition.

[0042] After the external pressure oil is disconnected, the piston 63 moves to the left under the action of the return spring 64, thereby driving the fork shaft 62 and the shift fork 61 to move to the left, causing the shift sleeve 52 to move to the left. The shift sleeve 52 is provided with an internal spline. After moving to the extreme position, the sliding shift sleeve 52 is connected to the output sun gear 51 through the spline, and the power is transmitted from the output sun gear 51 and the shift sleeve 52 to the output shaft 54 ​​in sequence, completing the power output under the forward gear condition.

[0043] In the present invention, the shift fork 61 is embedded in the annular groove on the shift gear sleeve 52 so as to be fixedly connected to the shift gear sleeve 52 .

[0044] In the present invention, the second bearing 24 and the fifth bearing 53 are deep groove ball bearings, and the first bearing 22 and the third bearing 25 are needle roller bearings.

[0045] All features described in the specification, the attached claims and the drawings, whether alone or in any combination thereof, are important features of the present utility model.

[0046] Although the embodiments of the utility model have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the utility model. Ordinary technicians in the field can change, modify, replace, modify, delete some features, add features or re-combine features to form a technical solution in the above embodiments without departing from the principles and purpose of the utility model within the scope of the utility model. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the innovative principles of the utility model are still within the scope of the technical solution of the utility model.

Claims

1. A self-adjusting continuously variable transmission box, comprising a box body (1) and an input shaft component (200), a planet carrier component (300), a ring gear component (400) and an output shaft component (500) arranged in the box body (1) and connected in driving sequence, characterized in that: The invention also comprises a pulley component (100) arranged in the housing (1), through which power is transmitted to the input shaft component (200), the pulley component (100) comprising a belt, a spring seat (11), a first spring (13), a left cam (14), a right cam (15), a left pulley (16) and a right pulley (17), the right cam (15) being fixedly connected to the left pulley (16), the left cam (14) being fixedly connected to the right pulley (17), the spring seat (11) being fixedly connected to the left cam (14), the first spring (13) being installed between the spring seat (11) and the left pulley (16), the belt being installed on the left pulley (16) and the right pulley (17), the left pulley (16) and the right pulley (17) being separated from each other and maintaining a certain distance; the right pulley (17) being fixedly connected to the input shaft (21) in the input shaft component (200).

2. A self-adjusting continuously variable transmission box according to claim 1, characterized in that: The spring seat (11) is fixedly connected to the left cam (14) via a first rivet (12).

3. A self-adjusting continuously variable transmission box according to claim 1, characterized in that: The input shaft component (200) comprises an input shaft (21) and an input shaft cover plate (23); the input shaft cover plate (23) is fixedly sleeved on the input shaft (21) via a second bearing (24); the planet carrier component (300) comprises a planet carrier (31), a planet shaft (33) and a planet gear (35); the planet carrier (31) is fixedly connected to the housing (1); the planet gear (35) is mounted on the planet carrier (31) via the planet shaft (33); the planet gear (35) meshes with the teeth on the input shaft (21); the ring gear component (400) comprises a ring gear connecting plate (41) and a ring gear (43); the ring gear (43) is fixedly connected to the ring gear connecting plate (41); the output shaft component ( 500) comprises an output sun gear (51), a shifting gear sleeve (52) and an output shaft (54), wherein the output sun gear (51) is arranged on the output shaft (54), the shifting gear sleeve (52) is mounted on the output shaft (54) in a circumferentially fixed and axially movable manner so that the shifting gear sleeve (52) is connected to the output sun gear (51) or the ring gear connecting plate (41), the planetary gear (35) is meshed with the output sun gear (51) and the ring gear (43) at the same time, the left side of the output shaft (54) is inserted into the input shaft (21) through a first bearing (22) and a third bearing (25), the left end of the output shaft (54) extends out of the input shaft (21), and the right end of the output shaft (54) extends out of the housing (1).

4. A self-adjusting continuously variable transmission box according to claim 3, characterized in that: The gear ring (43) is fixedly connected to the gear ring connecting plate (41) via rivets (42).

5. A self-adjusting continuously variable transmission box according to claim 3, characterized in that: When the shift gear sleeve (52) moves to the left end position, the external splines on the output sun gear (51) engage with the internal splines of the shift gear sleeve (52); when the shift gear sleeve (52) moves to the right end position, the internal splines on the gear ring connecting plate (41) engage with the external splines of the shift gear sleeve (52).

6. A self-adjusting continuously variable transmission box according to claim 3, characterized in that: The invention also comprises an operating component (600), wherein the operating component (600) comprises a shift fork (61), a fork shaft (62), a piston (63), a second spring (64) and a cylinder cover (65); the cylinder cover (65) is fixedly connected to the housing (1) to form a cavity for accommodating the piston (63) and the second spring (64); two ends of the second spring (64) respectively abut against the piston (63) and the cylinder cover (65); the piston (63) is fixedly connected to the fork shaft (62); one end of the fork shaft (62) extends into the housing (1) and is fixedly connected to the shift fork (61); and the shift fork (61) is fixedly connected to the shift gear sleeve (52).

7. A self-adjusting continuously variable transmission box according to claim 6, characterized in that: The shift fork (61) is embedded in the annular groove on the shift gear sleeve (52) so as to be fixedly connected to the shift gear sleeve (52).

8. A self-adjusting continuously variable transmission box according to claim 3, characterized in that: The right side of the output shaft (54) is supported on the housing (1) via a fifth bearing (53).

9. A self-adjusting continuously variable transmission box according to claim 8, characterized in that: The second bearing (24) and the fifth bearing (53) are deep groove ball bearings, and the first bearing (22) and the third bearing (25) are needle roller bearings.

10. A self-adjusting continuously variable transmission box according to claim 3, characterized in that: The planet carrier component (300) further comprises a steel ball (32), and the planet shaft (33) and the planet carrier (31) are limited by the steel ball (32).

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