High-integration agricultural machinery variable-speed transmission device

Abstract

The utility model relates to the technical field of agricultural machinery transmissions, in particular to a high-integration agricultural machinery gearbox which converts impact or sliding friction between a shifting fork and a speed change shaft sleeve into rolling friction, effectively reduces abrasion of the shifting fork and prolongs the service life of a high-integration agricultural machinery speed change transmission device. Comprising a transmission structure, a gear shifting mechanism and a clutch structure, the transmission structure comprises an input shaft, an intermediate shaft and an output shaft, the input shaft is connected with a sliding shaft sleeve through a spline, and the sliding shaft sleeve is sequentially provided with an annular mounting groove and gear shifting teeth in the axial direction; the gear shifting mechanism comprises a mounting rod perpendicular to the input shaft, a gear shifting arm is arranged at one end of the mounting rod, and the other end of the mounting rod is rotationally connected with a shifting wheel. The shifting wheel is arranged in the annular mounting groove, and the shifting wheel drives the sliding shaft sleeve to move in the axial direction of the input shaft during gear shifting.

Description

TECHNICAL FIELD

[0001] The utility model relates to agricultural machinery transmission technology field, concretely relates to a high integration degree agricultural machinery transmission. BACKGROUND

[0002] Transmission, also known as gearbox, is used to change the speed and torque from the engine, it can fix or change the transmission ratio of output shaft and input shaft. Transmission is composed of transmission mechanism and operating mechanism, some cars also have power output mechanism. Transmission mechanism is mostly used ordinary gear transmission, also some use planetary gear transmission. Ordinary gear transmission mechanism generally uses sliding gear and synchronizer etc.

[0003] In agricultural machinery equipment, such as micro tiller, transmission is also widely used among them; in order to better adapt to actual working conditions, the current development trend of agricultural machinery is multifunctional and specialized, among which specialization also involves improving integration and miniaturization, in micro tiller, it is realized by reducing gear position, such as the utility model discloses a kind of transmission of rotary tiller in the application No. CN202223073050.1, shift fork can drive the engagement sleeve to the combination tooth one or combination tooth two direction movement makes engagement sleeve and its meshing, realizes speed change.

[0004] However, when actually driving, the engagement sleeve will rotate with the shaft, and the shift fork will impact and slide when contacting the rotating engagement sleeve, which will cause wear of the shift fork and affect the use effect of the shift fork. At the same time, the existing transmission has complex structure and many components, which is not convenient for maintenance and overall miniaturization of the transmission structure. Therefore, how to realize miniaturization of the transmission and reduce wear of the shift fork in the gear shifting mechanism has become a problem to be solved. Utility model content

[0005] I. Technical problems solved

[0006] The utility model in the prior art, puts forward a kind of high integration degree agricultural machinery transmission, the impact or sliding friction between shift fork and transmission shaft sleeve is converted into rolling friction, effectively reduce the wear of shift fork, prolong the service life of high integration degree agricultural machinery transmission.

[0007] II. Specific technical solutions

[0008] The utility model provides a high integration agricultural machinery variable speed transmission device, including transmission mechanism, shift mechanism and clutch mechanism, transmission mechanism includes input shaft, intermediate shaft and output shaft, the input shaft is connected with the sliding sleeve through the spline, the sliding sleeve is sequentially provided with annular installation groove and shift gear along the axial direction, shift mechanism includes the installation rod perpendicular to the input shaft, one end of installation rod is provided with shift arm, the other end of installation rod is rotatably connected with the knob wheel, the knob wheel is arranged in the annular installation groove, and the knob wheel drives the sliding sleeve to move along the axial direction of input shaft when shifting.

[0009] Realization principle, working principle:

[0010] In the scheme, when the sliding sleeve provided on the input shaft actually needs to shift, the knob wheel at the other end of the installation rod is brought into abutment with the variable speed sleeve through the rotation of the shift arm, thereby pushing the sliding sleeve to slide along the axial direction of the input shaft, thereby meshing with the gear on the input shaft or other shafts, achieving gear change and transmission ratio change, when the knob wheel is in contact with the two side walls of the annular installation groove, the rotation of the sliding sleeve can drive the knob wheel to rotate, thereby effectively reducing the wear of the sliding sleeve and the knob wheel, and the service life of the shift mechanism can be effectively prolonged.

[0011] As a preferred, the input shaft includes a spline section and a light shaft section, the sliding sleeve is matched with the spline section, the input double gear is sleeved on the light shaft section, the side of the input double gear close to the sliding sleeve is provided with a containing groove matched with the shift gear, the beneficial effects of the present preferred are that two gears are set through one shift gear, the integration of the variable speed transmission device is effectively improved, and during gear shifting, the shift gear and the gear of the intermediate shaft can be meshed, or the containing groove can be matched to provide power through the input double gear of the light shaft section.

[0012] As a preferred, a plurality of limiting grooves are formed in the inner wall of the sliding sleeve, the spline section is provided with a containing hole in the radial direction, a limiting spring is arranged in the containing hole, the limiting spring is provided with a limiting ball on one side of the outer edge of the spline section, and the limiting ball is matched with the limiting groove, the beneficial effects of the present preferred are that when the gear shifting is completed, the gear needs to be kept stable and the power output also needs to be kept stable, the cooperation of the limiting spring, the limiting ball and the limiting groove in the inner wall of the sliding sleeve can keep the sliding sleeve stable when the gear is fixed.

[0013] As a preferred, a rod sleeve is sleeved on the outer side of the installation rod, the installation rod is rotatably connected in the rod sleeve, a sealing ring is arranged between the rod sleeve and the installation rod, and an oil seal is further arranged on the end of the rod sleeve close to the shift arm, the beneficial effects of the present preferred are that the sealing performance and dustproof performance can be well ensured through the arrangement of the sealing ring and the oil seal.

[0014] As preferred, a transition double gear is sleeved on the intermediate shaft, the transition first gear of the transition double gear is matched with the shift gear, and the transition second gear is engaged with the first gear of the input double gear, and the second gear of the input double gear is engaged with the gear of the clutch sleeve, and the preferred advantage is that different speeds and gears can be provided for the clutch sleeve section through different gears.

[0015] As preferred, the clutch mechanism comprises a clutch pin, the intermediate shaft is provided with a clutch mounting hole in the axial direction on the side of the clutch sleeve, the clutch pin is matched with the clutch mounting hole, the intermediate shaft is further provided with a clutch branch hole in the radial direction, the clutch mounting hole and the clutch branch hole are communicated, the clutch branch hole is provided with a clutch ball, and one end of the clutch pin is provided with a tapered clutch section, the clutch section pushes out the clutch ball to make the clutch ball abut against the inner wall of the clutch sleeve and the side wall of the clutch branch hole when the clutch pin moves in the depth direction of the clutch mounting hole.

[0016] As preferred, the clutch mechanism further comprises a mounting pin and a pressure plate, the outer side of the mounting pin is sleeved with a mounting cylinder, the two ends of the mounting cylinder in the axial direction are provided with a lever, the other end of the lever is rotationally connected to one side of the pressure plate, and the other end of the clutch pin is rotationally connected to the other side of the pressure plate, the rotation of the lever can drive the pressure plate away from or close to the intermediate shaft, and the clutch control of the clutch pin is realized, the clutch pin can rotate synchronously with the intermediate shaft when power transmission is performed, the wear is smaller, and the power transmission is smoother.

[0017] As preferred, the inner side of the clutch sleeve is provided with an arc-shaped accommodating groove, the arc-shaped accommodating groove is located at one side of the clutch branch hole, and the arc-shaped accommodating groove is matched with the clutch ball, the setting of the arc-shaped accommodating groove improves the contact area of the clutch ball and the clutch sleeve, and the power transmission of the clutch sleeve is stable.

[0018] As preferred, the two sides of the groove bottom of the arc-shaped accommodating groove are respectively a limiting part and a sliding part, the arc length of the sliding part projected onto the clutch sleeve is greater than the arc length of the limiting part projected onto the clutch sleeve, the sliding part of the arc-shaped accommodating groove is close to the limiting part of the adjacent arc-shaped accommodating groove, and the limiting part and the sliding part are distributed in the rotation direction of the intermediate shaft, the setting of the sliding part is more convenient for the clutch ball to enter the arc-shaped accommodating groove, the setting of the limiting part can well avoid the slipping of the clutch ball during the clutching, and the power transmission is more stable.

[0019] As preferred, the circumference of the intermediate shaft is further provided with a deposition groove which passes through the clutch support hole; the beneficial effect of the present preferred is that when the clutch ball is pushed to contact the clutch shaft sleeve, it will also contact and press the edge of the clutch support hole; in this pressing process, burrs will be generated; when burrs are generated, they are located in the annular groove and will not protrude from the outer surface of the intermediate shaft, thereby not affecting the rotation of the clutch shaft sleeve on the intermediate shaft.

[0020] The present utility model has the beneficial effects that:

[0021] Through the transmission of the various shafts and double teeth of the present scheme, the miniaturization of the overall structure of the gearbox is more favorable; compared with the existing gear shifting mechanism, the gear shifting mechanism provided has less wear and a longer service life; the setting of the clutch mechanism thereon can effectively improve the integration of the transmission device and is more favorable for the miniaturization of the overall agricultural machine. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a front view of the variable speed transmission device of the present utility model.

[0023] Figure 2 It is a rear view of the variable speed transmission device of the present utility model.

[0024] Figure 3 It is an axonometric view of the sliding shaft sleeve of the variable speed transmission device of the present utility model.

[0025] Figure 4 It is a cross-sectional view of the gear shifting mechanism of the variable speed transmission device of the present utility model.

[0026] Figure 5 It is a partial cross-sectional view of the input shaft of the variable speed transmission device of the present utility model.

[0027] Figure 6 It is an axonometric view of the clutch structure of the present variable speed transmission device.

[0028] Figure 7 It is a cross-sectional view of the variable speed transmission device of the present utility model.

[0029] Figure 8 It is a cross-sectional view of the clutch pin of the variable speed transmission device of the present utility model.

[0030] Figure 9 It is an axonometric view of the clutch shaft sleeve of the variable speed transmission device of the present utility model.

[0031] Figure 10 It is a side view of the clutch shaft sleeve of the variable speed transmission device of the present utility model.

[0032] Figure 11 It is a front view of the clutch pin of the variable speed transmission device of the present utility model.

[0033] Explanation of reference signs:

[0034] Transmission mechanism 1, input shaft 101, intermediate shaft 102, output shaft 103, sliding shaft sleeve 104, annular mounting groove 105, shift gear 106, spline section 107, light shaft section 108, input double gear 109, containing groove 110, limiting groove 111, containing hole 112, limiting spring 113, limiting ball 114, transition double gear 115, clutch shaft sleeve 116, transition gear 117, transition gear 118, first gear 119, second gear 120, clutch mounting hole 121, clutch branch hole 122, arc containing groove 123, limiting part 124, sliding part 125, sedimentation groove 126, shift mechanism 2, mounting rod 201, shift arm 202, jog wheel 203, rod sleeve 204, sealing ring 205, oil seal 206, clutch mechanism 3, clutch pin 301, clutch ball 302, clutch section 303, mounting pin 304, pressure plate 305, mounting cylinder 306, lever 307. DETAILED DESCRIPTION

[0035] The advantages and features of the present application will be more easily understood by those skilled in the art through the preferred embodiments of the present application in conjunction with the accompanying drawings, so that the scope of protection of the present application can be more clearly defined. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application. For example, Figures 1-11 As shown in the drawings:

[0036] A high-integration agricultural machinery variable speed transmission device, specifically as Figure 1 , comprising a transmission mechanism 1, a shift mechanism 2 and a clutch mechanism 3, wherein the transmission mechanism 1 comprises an input shaft 101, an intermediate shaft 102 and an output shaft 103, specifically, power is input through the sleeve on the input shaft, then the power is transmitted to the intermediate shaft 102 through the gear set, and finally the power is output through the output shaft 103, wherein the intermediate shaft 102 and the output shaft 103 are matched through bevel gears and bevel gears, which is more conducive to miniaturization of the transmission device after being assembled into the box; specifically, Figure 2 The sliding shaft sleeve 104 is connected to the input shaft 101 through the spline, and the sliding shaft sleeve 104 is Figure 3 , sequentially provided with an annular mounting groove 105 and a shift gear 106 along its axial direction; specifically, the shift mechanism 2 is Figure 4It comprises a mounting rod 201, wherein the mounting rod 201 is perpendicular to the input shaft 101, the right end of the mounting rod 201 is provided with a shifting arm 202, and the left end of the mounting rod 201 is rotationally connected with a push wheel 203, which is a bearing in specific implementation; the push wheel 203 is specifically clamped or mounted in the annular mounting groove 105, and the push wheel 203 drives the sliding shaft sleeve 104 to move along the axial direction of the input shaft 101 during gear shifting; as shown in Figure 4 A rod sleeve 204 is sleeved outside the mounting rod 201, the mounting rod 201 is rotationally connected in the rod sleeve 204, a sealing ring 205 is arranged between the rod sleeve 204 and the mounting rod 201, and an oil seal 206 is further arranged at the right end of the rod sleeve 204; through the arrangement of the sealing ring 205 and the oil seal 206, the sealing performance and dustproof performance of the gearbox can be well ensured.

[0037] Specifically as shown in Figure 2 , Figure 5 and Figure 7 , the input shaft 101 comprises a spline section 107 and a light shaft section 108, and the sliding shaft sleeve 104 is matched with the spline section 107; the light shaft section 108 is sleeved with an input double gear 109, the left side of the input double gear 109 is provided with a receiving groove 110, and the receiving groove 110 is matched with the shifting gear 106; in specific implementation, as shown in Figure 3 Two limiting grooves 111 are formed in the inner wall of the sliding shaft sleeve 104; as shown in Figure 5 The spline section 107 is radially provided with a receiving hole 112, a limiting spring 113 is mounted in the receiving hole 112, the limiting spring 113 is connected with a limiting ball 114 at one side of the outer edge of the spline section 107, and the limiting ball 114 is matched with the limiting groove 111.

[0038] Specifically as shown in Figure 2 and Figure 7 , the intermediate shaft 102 is sleeved with a transition double gear 115 and a clutch shaft sleeve 116, a transition first gear 117 of the transition double gear 115 is matched with the shifting gear 106, a transition second gear 118 of the transition double gear 115 is meshed with a first gear 119 of the input double gear 109, and a second gear 120 of the input double gear 109 is meshed with gear teeth of the clutch shaft sleeve 116.

[0039] Among them, when in low speed gear, the shifting gear 106 is meshed with the transition first gear 117, and the power is output to the output shaft 103 after four times of speed reduction; when in high speed gear, the shifting gear 106 is matched with the receiving groove 110, and the power is transmitted to the output shaft 103 after two times of speed reduction; in this scheme, one shifting gear 106 is used to realize the setting of two gears, which effectively improves the integration of the variable speed transmission device; after the gear shifting is completed, the gear position needs to be kept stable and the power output also needs to be stable; through the cooperation of the limiting spring 113, the limiting ball 114 and the limiting groove 111 in the inner wall of the sliding shaft sleeve 104, the gear position of the sliding shaft sleeve 104 can be ensured.

[0040] In implementation, as Figure 6 、 7 and Figure 8 , the clutch mechanism includes a clutch pin, the intermediate shaft is provided with a clutch mounting hole 121 on one side of the clutch sleeve 116 along the axial direction, and the clutch pin 301 is matched with the clutch mounting hole 121; the intermediate shaft 102 is also provided with a clutch branch hole 122 in the radial direction, the clutch mounting hole 121 and the clutch branch hole 122 are communicated, and the clutch branch hole 122 is provided with a clutch ball 302; one end of the clutch pin 301 is provided with a tapered clutch section 303, when the clutch pin 301 moves along the depth direction of the clutch mounting hole 121, the clutch section 303 pushes out the clutch ball 302 to make the clutch ball 302 abut against the inner wall of the clutch sleeve 116 and the side wall of the clutch branch hole 122; different from the existing clutch mechanism, the clutch is realized by the clutch pin 301 and the clutch ball 302 provided in the clutch mounting hole 121 of the intermediate shaft, the structure is less, the structure is more compact, and the integration is higher.

[0041] Further, the clutch mechanism further includes a mounting pin 304 and a pressure plate 305, the mounting pin 304 is specifically mounted on the box body of the gearbox, the outer side of the mounting pin 304 is rotatably connected with a mounting cylinder 306, both ends of the mounting cylinder 306 in the axial direction are provided with a lever 307, the other end of the lever 307 is rotatably connected to the right side of the pressure plate, and the other end of the clutch pin 301 is rotatably connected to the other side of the pressure plate 305 through a bearing; in implementation, the rotation of the lever 307 can drive the pressure plate 305 and the intermediate shaft 102 to change the distance, thereby realizing the clutch control of the clutch pin 301, wherein the clutch pin 301 can rotate synchronously with the intermediate shaft 102 when power transmission is performed, the wear is smaller, the power transmission is more smooth, and it is worth noting that the clutch pin 301 is gap matched with the intermediate shaft 102.

[0042] Further, in order to improve the stability of power transmission, as Figure 9 、 10 and 11, the inner wall of the clutch sleeve 116 is provided with an arc-shaped accommodating groove 123, the arc-shaped accommodating groove 123 is located at one side of the clutch branch hole 122, and the arc-shaped accommodating groove 123 is matched with the clutch ball 302; through the arrangement of the arc-shaped accommodating groove 123, the contact area of the clutch ball 302 and the clutch sleeve 116 is improved, so that the power transmission of the clutch sleeve 116 is stable.

[0043] Specifically, as Figure 10The left and right sides of the groove bottom of the arc-shaped accommodating groove 123 are respectively a limiting portion 124 and a sliding portion 125, the arc length of the sliding portion 125 projected onto the clutch shaft sleeve 116 is greater than the arc length of the limiting portion 124 projected onto the clutch shaft sleeve 116, and the sliding portion 125 of the arc-shaped accommodating groove 123 is adjacent to the limiting portion 124 of the adjacent arc-shaped accommodating groove 123; and the limiting portion 124 and the sliding portion 125 are distributed along the rotation direction of the intermediate shaft; the sliding portion 125 is arranged to facilitate the clutch ball 302 to enter the arc-shaped accommodating groove 123, and the limiting portion 124 is arranged to avoid the clutch ball 302 from slipping during clutching, so that the power transmission is more stable.

[0044] In implementation, for example, Figure 11 The intermediate shaft 102 is further provided with a deposition groove 126 around the clutch branch hole 122; when the clutch ball 302 is pushed to contact the clutch shaft sleeve 116, the clutch ball 302 will also contact and press the edge of the clutch branch hole 122; burrs will exist in the pressing, and the burrs are located in the deposition groove 126 and will not protrude from the outer surface of the intermediate shaft 102, so as to avoid affecting the rotation of the clutch shaft sleeve 116 on the intermediate shaft 102.

[0045] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims.

Claims

1. A high-integration agricultural machinery variable speed transmission device, comprising a transmission mechanism (1), a gear shifting mechanism (2) and a clutch mechanism (3), the transmission mechanism (1) comprising an input shaft (101), an intermediate shaft (102) and an output shaft (103), characterized in that: The input shaft (101) is connected with a sliding sleeve (104) through a spline, the sliding sleeve (104) is sequentially provided with an annular mounting groove (105) and a shift gear (106) in the axial direction; the shift mechanism (2) comprises a mounting rod (201) perpendicular to the input shaft (101), one end of the mounting rod (201) is provided with a shift arm (202), the other end of the mounting rod (201) is rotatably connected with a dial wheel (203); the dial wheel (203) is arranged in the annular mounting groove (105), and the dial wheel (203) drives the sliding sleeve (104) to move along the axial direction of the input shaft (101) during shifting.

2. The high integration agricultural machine speed change transmission device according to claim 1, characterized in that: The input shaft (101) comprises a spline section (107) and a light shaft section (108), the sliding sleeve (104) is matched with the spline section (107); the light shaft section (108) is sleeved with an input double gear (109), the input double gear (109) is provided with a containing groove (110) on the side close to the sliding sleeve (104), and the containing groove (110) is matched with the shift gear (106).

3. The high integration farm machine transmission according to claim 2, characterized in that: A plurality of limiting grooves (111) are formed in the inner wall of the sliding sleeve (104); the spline section (107) is provided with a containing hole (112) in the radial direction, a limiting spring (113) is arranged in the containing hole (112), the limiting spring is provided with a limiting ball (114) on the side of the outer edge of the spline section (107), and the limiting ball (114) is matched with the limiting groove (111).

4. The high integration farm machine transmission according to claim 1, characterized in that: The mounting rod (201) is sleeved with a rod sleeve (204) on the outside, the mounting rod (201) is rotatably connected in the rod sleeve (204), a sealing ring (205) is arranged between the rod sleeve (204) and the mounting rod (201), and an oil seal (206) is further arranged on the end of the rod sleeve (204) close to the shift arm (202).

5. The high integration farm machine transmission according to claim 1, characterized in that: The intermediate shaft (102) is sleeved with a transition double gear (115) and a clutch sleeve (116), a transition tooth (117) of the transition double gear (115) is matched with the shift gear (106), a transition two tooth (118) of the transition double gear (115) is meshed (119) with a first tooth of the input double gear (109), and a second tooth (120) of the input double gear (109) is meshed with a gear of the clutch sleeve (116).

6. The high integration farm machine transmission according to claim 5, wherein: The clutch mechanism (3) comprises a clutch pin (301), an intermediate shaft (102) is provided with a clutch mounting hole (121) in the axial direction on one side of a clutch sleeve (116), the clutch pin (301) is matched with the clutch mounting hole (121); the intermediate shaft (102) is further provided with a clutch branch hole (122) in the radial direction, the clutch mounting hole (121) and the clutch branch hole (122) are communicated, the clutch branch hole (122) is provided with a clutch ball (302); the clutch pin (301) is provided with a tapered clutch section (303), when the clutch pin (301) moves in the depth direction of the clutch mounting hole (121), the clutch section (303) pushes out the clutch ball (302) to make the clutch ball (302) abut against the inner wall of the clutch sleeve (116) and the side wall of the clutch branch hole (122).

7. The high integration farm machine transmission according to claim 6, characterized in that: The clutch mechanism (3) further comprises a mounting pin (304) and a pressure plate (305), the outer side of the mounting pin (304) is sleeved with a mounting cylinder (306), the two ends of the mounting cylinder (306) in the axial direction are provided with a lever (307), the other end of the lever (307) is rotatably connected to one side of the pressure plate (305), the other end of the clutch pin (301) is rotatably connected to the other side of the pressure plate (305).

8. The high integration farm machine transmission according to claim 6, characterized in that: The inner side of the clutch sleeve (116) is provided with an arc-shaped accommodating groove (123), the arc-shaped accommodating groove (123) is located at one side of the clutch branch hole (122), and the arc-shaped accommodating groove (123) is matched with the clutch ball (302).

9. The high integration farm machine transmission according to claim 8, characterized in that: The two sides of the groove bottom of the arc-shaped accommodating groove (123) are respectively a limiting portion (124) and a sliding portion (125), the arc length of the sliding portion (125) projected onto the clutch sleeve (116) is greater than the arc length of the limiting portion (124) projected onto the clutch sleeve (116), the sliding portion (125) of the arc-shaped accommodating groove (123) is close to the limiting portion (124) of the adjacent arc-shaped accommodating groove (123), and the limiting portion (124) and the sliding portion (125) are distributed in the rotation direction of the intermediate shaft (102).

10. The high integration degree farm machine speed change transmission device according to claim 6, characterized by: The intermediate shaft (102) is further provided with a deposition groove (126) in the circumferential direction, and the deposition groove (126) passes through the clutch branch hole (122).

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