Clutch transmission system of rotary cultivator

Abstract

The invention discloses a clutch transmission system of a rotary cultivator. The clutch transmission system comprises a gearbox body, a power input shaft, a driven belt pulley, a hydraulic pump and a clutch, one end of the power input shaft is connected with the driven belt pulley; the other end of the power input shaft penetrates through the box body and then is connected with a pump shaft of the hydraulic pump; the clutch is a normally open clutch and is arranged on the power input shaft in a sleeving manner; an output driving gear is arranged on an outer cover of the clutch, and when the clutch is combined, the power input shaft can drive the output driving gear to rotate synchronously through the clutch. Braking can be rapidly achieved, the braking efficiency is improved, and therefore safety is improved; and the structural layout is more reasonable, the use of parts can be effectively reduced, the occupied space of power transmission parts is reduced, the stability of power transmission is improved, and the cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of rotary tillers, and in particular to a clutch transmission system of a rotary tiller. Background Art

[0002] With the development of technology, more and more agricultural equipment is used in agricultural production. Among them, rotary tillers are mainly used for plowing and harrowing fields. They are widely used because of their ability to break up the soil and the high flatness of the ground after plowing.

[0003] The current rotary tiller, during operation, mainly drives the power output shaft and the hydraulic pump shaft through the pulley on the engine output shaft. Usually, the clutch of the rotary tiller adopts a normally closed clutch, and the power output is controlled by the clutch on and off. However, during use, such a structure has poor safety, especially when it is necessary to stop working or walking without stopping the machine, and the clutch must be controlled and kept separated, which not only has poor safety, but also brings great inconvenience to the operator. At the same time, after the clutch is disconnected, due to the effect of inertia, the walking end and / or the tilling end will continue to rotate at a certain speed. Even if braking is performed by a braking mechanism, it will take a certain period of time to completely stop, resulting in reduced braking efficiency.

[0004] In addition, in the existing rotary tillers, since the hydraulic pump shaft is driven by the pulley and belt on the engine output shaft, the hydraulic pump and the pulley on the engine output shaft are installed on the same side of the rotary tiller during installation. This not only causes the entire power transmission system to occupy a larger space after installation, but also requires multiple pulleys or a pulley with multiple belt grooves to be installed on the engine output shaft, which will also increase the number of parts, not only increasing the cost, but also easily affecting the stability of the entire power transmission process. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to solve the problems that the existing rotary tillers have many power transmission components, occupy a large space, have unchanged clutch control, poor safety, and low braking efficiency; to provide a rotary tiller clutch transmission system that can quickly achieve braking, improve braking efficiency, and thus improve safety; and the structural layout is more reasonable, which can effectively reduce the use of components, reduce the space occupied by power transmission components, improve the stability of power transmission, and reduce costs.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows: a rotary tiller clutch transmission system, comprising a gearbox housing, a power input shaft, a driven pulley, a hydraulic pump and a clutch; one end of the power input shaft is connected to the driven pulley; it is characterized in that the other end of the power input shaft passes through the housing and is connected to the pump shaft of the hydraulic pump; The clutch is a normally open clutch and is sleeved on the power input shaft; an output driving gear is arranged on the outer cover of the clutch, and when the clutch is engaged, the power input shaft can drive the output driving gear to rotate synchronously through the clutch.

[0007] Furthermore, the normally open clutch comprises an outer cover, a pressure plate, an active friction plate and a driven friction plate which are sleeved on the power input shaft; wherein one end of the outer cover is closed and the other end is open, and the output driving gear is fixedly connected to the closed end of the outer cover; a plurality of slots are provided on the outer cover around one circle, and the slots pass through the open end of the outer cover; the active friction plate and the driven friction plate are alternately distributed on the inner side of the outer cover, and the pressure plate is located at the open end of the outer cover; a transmission plate is provided at the outer edge of the driven friction plate and the pressure plate at the position corresponding to the slot, and the transmission plate extends The driven friction plate and the pressure plate can move in the axial direction of the power input shaft; the position of the power input shaft corresponding to the clutch is formed with a plurality of tooth grooves around the power input shaft; the inner edge of the active friction plate is provided with convex teeth at the position corresponding to the tooth grooves, and the convex teeth are meshed with the tooth grooves, so that the power input shaft can drive the active friction plate to rotate synchronously; a clutch fork is provided on the side of the pressure plate away from the outer cover, and the clutch fork is connected to the housing through the fork shaft, and the fork can be rotated through the fork shaft, thereby driving the pressure plate to move in the axial direction of the power input shaft.

[0008] Furthermore, the transmission sheet on the outer edge of the pressure plate protrudes from the outer wall of the outer cover, and a clutch spring is provided between the closed end of the outer cover and the transmission sheet on the outer edge of the pressure plate.

[0009] Furthermore, the inner edge of the pressure plate extends toward the side away from the outer cover to form a shaft tube, and a plurality of notches are provided at the end of the shaft tube; a limit plate is also sleeved on the power input shaft, and the limit plate is located on the side of the shaft tube away from the outer cover, and a shaft sleeve is provided on the side close to the shaft tube, and a protrusion is provided at the end of the shaft sleeve corresponding to the position of the notch, and the protrusion extends into the notch, so that the limit plate can rotate synchronously with the pressure plate; A brake friction pad is arranged on the side of the limit plate away from the sleeve. The brake friction pad is fixedly connected to the box body through a friction pad support seat. When the limit plate moves toward the brake friction pad, it can contact the brake friction pad and generate friction.

[0010] Furthermore, a thrust bearing is provided between the pressure plate and the clutch fork.

[0011] Furthermore, the hydraulic pump is fixedly connected to the box body via a connecting seat.

[0012] Furthermore, the power input shaft is connected to the pump shaft of the hydraulic pump through a coupling.

[0013] Furthermore, it also includes a transmission shaft, on which an output driven gear is provided, and the output driven gear is meshed with the output driving gear.

[0014] Compared with the prior art, the present invention has the following advantages: 1. The engine output shaft only needs to drive the power input shaft of the gearbox through the pulley and belt. Since the pump shaft of the hydraulic pump is directly connected to the power input shaft, the hydraulic pump can be started as long as the engine is started. This can effectively reduce parts and costs, and improve power transmission efficiency and stability. In addition, installing the hydraulic pump on the side of the gearbox away from the pulley can effectively reduce the space occupied by the gearbox and make installation more convenient.

[0015] 2. By setting a separation spring between the outer cover and the pressure plate, the active friction plate and the driven friction plate can be quickly separated, thereby quickly cutting off the power.

[0016] 3. When the clutch is disengaged, the separation spring pushes the pressure plate to move, and then pushes the limit plate and the friction plate to press tightly to generate friction, and then reacts to the outer cover, thereby quickly braking the outer cover and achieving rapid braking of the output driving gear, that is, braking of the entire rotary tiller, which can greatly improve the safety of the rotary tiller during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the present invention.

[0018] Figure 2 for Figure 1 Schematic diagram of the structure after omitting the clutch fork.

[0019] Figure 3 for Figure 2 Section view along AA.

[0020] In the figure: 1—power input shaft, 2—driven pulley, 3—hydraulic pump, 41—outer cover, 42—pressure plate, 43—driving friction plate, 44—driven friction plate, 45—transmission plate, 5—output driving gear, 6—clutch fork, 7—clutch release spring, 8—limiting plate, 9—brake friction plate, 10—friction plate support seat, 11—thrust bearing, 12—connecting seat, 13—transmission shaft, 14—output driven gear. DETAILED DESCRIPTION

[0021] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0022] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. In the description of the present invention, it should be noted that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the invention product is usually placed when used, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In addition, the terms "horizontal", "vertical", etc. do not mean that the components are absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted. In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] Example: See Figure 1 , Figure 2 as well as Figure 3A clutch transmission system for a rotary tiller includes a gearbox housing, a power input shaft 1, a driven pulley 2, a hydraulic pump 3 and a clutch. One end of the power input shaft 1 is connected to the driven pulley 2; the other end of the power input shaft 1 passes through the housing and is connected to the pump shaft of the hydraulic pump 3. During implementation, the power input shaft 1 is connected to the pump shaft of the hydraulic pump 3 through a coupling. The hydraulic pump 3 (housing) is fixedly connected to the housing through a connecting seat 12, wherein a support bearing is provided between the connecting shaft and the power input shaft 1, thereby ensuring the normal rotation of the power input shaft 1.

[0025] The clutch is a normally open clutch and is sleeved on the power input shaft 1; an output driving gear 5 is provided on the outer cover 41 of the clutch. When the clutch is engaged, the power input shaft 1 can drive the output driving gear 5 to rotate synchronously through the clutch.

[0026] The normally open clutch comprises an outer cover 41, a pressure plate 42, an active friction plate 43 and a driven friction plate 44 which are sleeved on the power input shaft 1. The outer cover 41 is closed at one end and open at the other end. The output driving gear 5 is sleeved on the power input shaft 1 and fixedly connected to the closed end of the outer cover 41, and there is a gap between the output driving gear 5 and the power input shaft 1. Several card slots are provided around the outer cover 41, wherein the card slots penetrate the side walls (inner wall and outer wall) of the outer cover 41 and are arranged along the axial direction of the power output shaft, and the card slots penetrate the open end of the outer cover 41. The active friction plate 43 and the driven friction plate 44 are alternately distributed on the inner side of the outer cover 41, and the pressure plate 42 is located at the open end of the outer cover 41. A transmission sheet 45 is provided at the outer edge of the driven friction plate 44 and the pressure plate 42 at the position corresponding to the slot, and the transmission sheet 45 extends into the slot at the corresponding position, and the driven friction plate 44 and the pressure plate 42 can move along the axial direction of the power input shaft 1; during the movement of the pressure plate 42, the transmission sheet 45 at its edge is always located in the slot. Among them, the transmission sheet 45 on the outer side of the driven friction plate 44 is located between the inner wall and the outer wall of the outer cover 41 or is flush with the outer wall of the outer cover 41 (i.e., it does not protrude from the outer cover 41). The power input shaft 1 is formed with several tooth grooves around the position corresponding to the clutch, and the inner edge of the active friction plate 43 is provided with convex teeth at the position corresponding to the tooth groove, and the convex teeth are meshed with the tooth groove, so that the power input shaft 1 can drive the active friction plate 43 to rotate synchronously. During implementation, the transmission sheet 45 at the outer edge of the pressure plate 42 protrudes from the outer wall of the outer cover 41, and a clutch separation spring 7 is provided between the closed end of the outer cover 41 and the transmission sheet 45 at the outer edge of the pressure plate 42. As an optimization, a convex edge is provided on the outer side of the closed end of the outer cover 41 to form a spring seat; the clutch spring 7 is sleeved on the outer cover 41, and its two ends are respectively in contact with the convex edge and the transmission plate 45 on the outer edge of the pressure plate 42.

[0027] A clutch fork 6 is provided on the side of the pressure plate 42 away from the outer cover 41. The clutch fork 6 is connected to the housing through a fork shaft, and the fork can be rotated through the fork shaft, thereby driving the pressure plate 42 to move axially along the power input shaft 1. During implementation, a thrust bearing 11 is also provided between the pressure plate 42 and the clutch fork 6. In the actual assembly process, a transmission shaft 13 is also included, on which an output driven gear 14 is provided, and the output driven gear 14 is meshed with the output driving gear 5.

[0028] In the specific implementation process, the inner edge of the pressure plate 42 extends toward the side away from the outer cover 41 to form a shaft tube, and the end of the shaft tube is provided with several notches; the thrust bearing 11 is sleeved on the shaft tube. A limit plate 8 is also sleeved on the power input shaft 1, and the limit plate 8 is located on the side of the shaft tube away from the outer cover 41, and a shaft sleeve is provided on the side close to the shaft tube, and a protrusion is provided at the end of the shaft sleeve corresponding to the position of the notch, and the protrusion extends into the notch, so that the limit plate 8 can rotate synchronously with the pressure plate 42; when the pressure plate 42 moves under the push of the shift fork, the protrusion is always located in the notch, thereby ensuring that the output driving gear 5 can be quickly braked when the clutch is disengaged.

[0029] A brake friction pad 9 is provided on the side of the limit plate 8 away from the shaft sleeve, and the brake friction pad 9 is fixedly connected to the box body through a friction pad support seat 10. When the limit plate 8 moves toward the brake friction pad 9, it can contact the brake friction pad 9 and generate friction. During implementation, one side of the connection seat 12 extends into the box body and is formed with a support tube. The support seat is sleeved on the support tube and has an interference fit with the support tube to achieve a fixed connection with the box body.

[0030] In this solution, the engine output shaft only needs to drive the power input shaft 1 of the gearbox through the pulley and the belt. Since the pump shaft of the hydraulic pump 3 is directly connected to the power input shaft 1, the hydraulic pump 3 can be started as long as the engine is started. In this way, it can effectively reduce parts and costs, and improve power transmission efficiency and stability. In addition, installing the hydraulic pump 3 on the side of the gearbox away from the pulley can also effectively reduce the space occupied by the gearbox, and installation is also more convenient.

[0031] By arranging a separation spring between the outer cover 41 and the pressure plate 42, the active friction plate 43 and the driven friction plate 44 can be quickly separated, thereby quickly cutting off the power. When the clutch is disengaged, the separation spring pushes the pressure plate 42 to move, thereby pushing the limit plate 8 to press against the friction plate to generate friction, and then reacts to the outer cover 41, thereby quickly braking the outer cover 41, achieving rapid braking of the output driving gear 5, that is, braking of the entire rotary tiller, which can greatly improve the safety of the rotary tiller during use.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the technical solution. Those skilled in the art should understand that those modifications or equivalent substitutions of the technical solution of the present invention that do not depart from the purpose and scope of the technical solution should be included in the scope of the claims of the present invention.

Claims

1. A clutch transmission system for a rotary tiller, comprising a gearbox housing, a power input shaft, a driven pulley, a hydraulic pump and a clutch; one end of the power input shaft is connected to the driven pulley; characterized in that: The other end of the power input shaft passes through the box body and is connected to the pump shaft of the hydraulic pump; The clutch is a normally open clutch and is sleeved on the power input shaft; an output driving gear is arranged on the outer cover of the clutch, and when the clutch is engaged, the power input shaft can drive the output driving gear to rotate synchronously through the clutch.

2. A rotary tiller clutch transmission system according to claim 1, characterized in that: The normally open clutch comprises an outer cover, a pressure plate, an active friction plate and a driven friction plate sleeved on the power input shaft; wherein one end of the outer cover is closed and the other end is open, and the output driving gear is fixedly connected to the closed end of the outer cover; a plurality of slots are provided on the outer cover around one circle, and the slots penetrate the open end of the outer cover; the active friction plate and the driven friction plate are alternately distributed on the inner side of the outer cover, and the pressure plate is located at the open end of the outer cover; transmission plates are provided at the outer edges of the driven friction plate and the pressure plate at positions corresponding to the slots, and the transmission plates extend into the pair of The driven friction plate and the pressure plate can both move axially along the power input shaft; the power input shaft is formed with a plurality of tooth grooves around a circle corresponding to the position of the clutch, and the inner edge of the active friction plate is provided with convex teeth at the position corresponding to the tooth grooves, and the convex teeth are engaged with the tooth grooves, so that the power input shaft can drive the active friction plate to rotate synchronously; a clutch fork is provided on the side of the pressure plate away from the outer cover, and the clutch fork is connected to the housing through the fork shaft, and the fork can be rotated through the fork shaft, thereby driving the pressure plate to move axially along the power input shaft.

3. A rotary tiller clutch transmission system according to claim 2, characterized in that: The transmission sheet on the outer edge of the pressure plate protrudes from the outer wall of the outer cover, and a clutch separation spring is arranged between the closed end of the outer cover and the transmission sheet on the outer edge of the pressure plate.

4. The rotary tiller clutch transmission system according to claim 2, characterized in that: The inner edge of the pressure plate extends toward the side away from the outer cover to form a shaft tube, and the end of the shaft tube is provided with a plurality of notches; a limit plate is also sleeved on the power input shaft, and the limit plate is located on the side of the shaft tube away from the outer cover, and a shaft sleeve is provided on the side close to the shaft tube, and a protrusion is provided at the end of the shaft sleeve corresponding to the position of the notch, and the protrusion extends into the notch, so that the limit plate can rotate synchronously with the pressure plate; A brake friction pad is arranged on the side of the limit plate away from the sleeve. The brake friction pad is fixedly connected to the box body through a friction pad support seat. When the limit plate moves toward the brake friction pad, it can contact the brake friction pad and generate friction.

5. The rotary tiller clutch transmission system according to claim 2, characterized in that: A thrust bearing is also provided between the pressure plate and the clutch fork.

6. The clutch transmission system of a rotary tiller according to claim 1, characterized in that: The hydraulic pump is fixedly connected to the box body through a connecting seat.

7. The clutch transmission system of a rotary tiller according to claim 1, characterized in that: The power input shaft is connected to the pump shaft of the hydraulic pump through a coupling.

8. The clutch transmission system of a rotary tiller according to claim 1, characterized in that: The utility model also comprises a transmission shaft, on which an output driven gear is arranged, and the output driven gear is meshed with the output driving gear.

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