Clutch transmission mechanism

Abstract

The invention discloses a clutch transmission mechanism which comprises a transmission shaft, a transmission gear is rotationally connected to the transmission shaft, a first clutch part is arranged on the transmission gear, a second clutch part in clutch fit with the first clutch part through a pawl is connected to the transmission shaft through a sliding key, and the first clutch part and the transmission gear are coaxially arranged. The first clutch part is elastically connected with the transmission gear in the rotation direction. According to the scheme, the problem that in the prior art, a clutch transmission mechanism is prone to tooth hitting, and consequently excessive abrasion or damage is caused is solved.

Description

Technical Field

[0001] The invention relates to a clutch of an agricultural machinery, in particular to a clutch transmission mechanism. Background Art

[0002] Agricultural machinery refers to various machines used in the production process of crop planting and animal husbandry, as well as in the primary processing and treatment of agricultural and livestock products. The clutch is a commonly used clutch transmission mechanism in mechanical transmission, which can separate or engage the transmission system at any time to cut off or transmit the power input by the engine.

[0003] Existing agricultural machinery clutch transmissions usually use friction clutch structures and tooth clutch structures. For small agricultural machinery, the friction clutch structure may slip under high loads, resulting in a poor user experience. Since the tooth clutch mechanism has better stability under high loads, the tooth clutch structure is more commonly used.

[0004] Chinese patent document CN219587993U discloses a clutch device for agricultural machinery, including a transmission case, wherein a transmission mechanism and a clutch mechanism are arranged in the transmission case, wherein the transmission mechanism includes a transmission shaft and a transmission gear, and the clutch mechanism is located on the transmission mechanism; the transmission gear is loosely sleeved on the transmission shaft; the clutch mechanism includes a first clutch portion axially arranged on the transmission gear and a second clutch portion combined with or separated from the first clutch portion, wherein the second clutch portion slides along the transmission shaft and drives the transmission shaft to rotate, wherein the first clutch portion is combined with the second clutch portion after the second clutch portion slides along the transmission shaft, and the first clutch portion drives the second clutch portion to rotate; a first groove portion and a first convex portion are arranged at one end of the first clutch portion facing the second clutch portion, and a second groove portion and a second convex portion are arranged at one end of the second clutch portion facing the first clutch portion, wherein when the first clutch portion is combined with the second clutch portion, the second convex portion is inserted into the first groove portion, and the first convex portion is inserted into the second groove portion.

[0005] The above-mentioned prior art solution is a typical tooth-type clutch mechanism, which has a simple structure and can adapt to high load conditions. However, in actual use, when the clutch is switched in high-speed mode, there is a situation where the first clutch part and the second clutch part are engaged, and after long-term use, there will be problems of excessive wear or damage. Summary of the invention

[0006] The object of the present invention is to provide a clutch transmission mechanism to solve the problem in the prior art that the clutch transmission mechanism is prone to tooth-snagging and causes excessive wear or damage.

[0007] In order to achieve the above-mentioned purpose, the basic scheme of the present invention provides a clutch transmission mechanism, including a transmission shaft, a transmission gear is rotatably connected to the transmission shaft, a first clutch part is arranged on the transmission gear, a second clutch part is connected to the transmission shaft with a sliding key and clutched with the first clutch part through a pawl, the first clutch part is coaxially arranged with the transmission gear, and the first clutch part is elastically connected to the transmission gear along the rotation direction.

[0008] The beneficial effect of this basic scheme is that when the second clutch part slides on the transmission shaft to engage with the first clutch part through the pawl, the second clutch part transmits the rotational power of the transmission shaft to the first clutch part, and then the first clutch part transmits the rotational power to the transmission gear. When the second clutch part is combined with the first clutch part, due to the elastic connection between the first clutch part and the transmission gear, the combination impact of the first clutch part, the second clutch part and the transmission gear is greatly reduced, thereby avoiding the occurrence of tooth hitting due to combination impact, and thus avoiding the phenomenon of excessive wear or damage of the first clutch part, the second clutch part and the transmission gear.

[0009] Preferably, the first clutch part is provided with a protrusion, the transmission gear is provided with a groove for the protrusion to slide, and an elastic member for power transmission between the protrusion and the transmission gear is provided in the groove. With such a configuration, the elastic connection between the first clutch part and the transmission gear is achieved through the cooperation of the protrusion, the groove and the elastic member, which is conducive to improving the reliability of power transmission between the first clutch part and the transmission gear.

[0010] Preferably, the end of the transmission gear is provided with a receiving groove for accommodating the first clutch part, the groove is radially arranged along the outer side of the receiving groove, and the protrusion is radially arranged along the outer side of the first clutch part. With such an arrangement, the space occupied by the first clutch part and the space occupied by the transmission gear at least partially overlap, which is conducive to realizing the elastic connection between the first clutch part and the transmission gear without changing the original moving space of the second clutch part, thereby facilitating the replacement of the original clutch transmission mechanism based on the existing design.

[0011] Preferably, the elastic member is a compression spring. With such an arrangement, the power is transmitted through the compression force of the spring, which is conducive to facilitating the installation of the elastic member, thereby simplifying the structure.

[0012] Preferably, a limiter assembly is provided between the transmission gear and the first clutch part, which is used to limit the relative rotation limit distance between the first clutch part and the transmission gear to be less than the maximum allowable deformation of the elastic member. With such an arrangement, the elastic member is prevented from being over-deformed and thus failing or being damaged, which is beneficial to prolonging the service life of the clutch transmission mechanism.

[0013] Preferably, the limit assembly includes a limit groove and a limit block sliding along the limit groove, and the limit distance of the limit block sliding along the limit groove is less than the maximum allowable deformation of the elastic member. Such a setting is conducive to simplifying the structure of the limit assembly, thereby facilitating processing and setting.

[0014] Preferably, the limiting groove is radially arranged outside the containing groove, and the limiting block is radially arranged outside the first clutch portion. Such an arrangement is conducive to reducing the space occupied by the limiting assembly, thereby facilitating processing and arrangement.

[0015] Preferably, a rolling element is provided on the transmission shaft to support the second clutch part to slide in the axial direction. Such a configuration is helpful to reduce the sliding resistance between the second clutch part and the transmission shaft, thereby making the operation more labor-saving.

[0016] Preferably, the transmission shaft is provided with a first slide groove in the axial direction, the second clutch part is provided with a second slide groove corresponding to the first slide groove, and the rolling element is located between the first slide groove and the second slide groove. With such a configuration, the rolling element can reduce the sliding resistance between the second clutch part and the transmission shaft, and can also transmit the power between the transmission shaft and the second clutch part, thereby improving the reliability between the second clutch part and the transmission shaft.

[0017] The present invention has the following beneficial effects: 1. The clutch transmission mechanism of the present invention effectively avoids the phenomenon of tooth knocking caused by coupling impact when the first clutch part and the second clutch part are coupled, thereby avoiding the problem of excessive wear or damage to the clutch transmission mechanism.

[0018] 2. The clutch transmission mechanism of the present invention has a compact structure and realizes elastic connection between the first clutch part and the transmission gear without changing the movement space of the original second clutch part, thereby facilitating replacement of the original clutch transmission mechanism based on the existing design. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of a clutch transmission mechanism embodiment of the present invention; Figure 2 A clutch transmission mechanism of the present invention is provided along Figure 1 Axial view of the drive shaft. DETAILED DESCRIPTION

[0020] Definition: Elastic connection refers to a connection form with elasticity. Limit distance refers to the maximum distance of movement. The maximum allowable deformation of the elastic part refers to the critical deformation when the elastic part fails or is damaged. When the elastic part exceeds this deformation, the elastic part will fail or be damaged and cannot be restored.

[0021] The following is further described in detail through specific implementation methods: The reference numerals in the drawings of the specification include: a second clutch part 1, a pawl 2, a rolling element 3, a first slide groove 4, a second slide groove 5, a limiting groove 6, a limiting block 7, a protrusion 8, an elastic element 9, a transmission shaft 10, and a transmission gear 11.

[0022] The embodiment is basically as shown in the attached Figure 1 and Figure 2 As shown: A clutch transmission mechanism includes a transmission shaft 10, a transmission gear 11 is rotatably connected to the transmission shaft 10, a first clutch part is arranged on the transmission gear 11, a second clutch part 1 is connected to the transmission shaft 10 by a sliding key, and the second clutch part 1 is clutched and matched with the first clutch part through a ratchet 2, and the first clutch part and the second clutch part 1 are switched between a combined state and a separated state, so as to realize power transmission and power cutoff between the rotating shaft and the transmission gear 11. The end of the first clutch part facing the second clutch part 1 and the end of the second clutch part 1 facing the first clutch part are both integrally formed with a ratchet 2, and the ratchet 2 on the first clutch part is combined and separated with the ratchet 2 on the second clutch part 1 to realize power transmission and cutoff.

[0023] A plurality of first slide grooves 4 are axially arranged on the transmission shaft 10, a second slide groove 5 corresponding to the first slide groove 4 is arranged on the second clutch part 1, and a rolling element 3 is arranged between the first slide groove 4 and the second slide groove 5, so as to reduce the resistance when the second clutch part 1 slides along the transmission shaft 10. In this embodiment, the rolling element 3 is preferably a spherical ball.

[0024] The first clutch part is coaxially arranged with the transmission gear 11, and the first clutch part is elastically connected with the transmission gear 11 along the rotation direction. In this embodiment, the first clutch part is provided with a protrusion 8, and the transmission gear 11 is provided with a groove for the protrusion 8 to slide, and an elastic member 9 for power transmission between the protrusion 8 and the transmission gear 11 is provided in the groove. In this embodiment, the elastic member 9 is preferably a compression spring. The end of the transmission gear 11 is provided with a receiving groove for accommodating the first clutch part, and the groove is radially arranged along the outer side of the receiving groove, and the protrusion 8 is radially arranged along the outer side of the first clutch part. In this embodiment, four grooves are provided and are centrally symmetrically arranged around the rotation axis of the transmission gear 11, and correspondingly, four protrusions 8 are also correspondingly provided and are centrally symmetrically arranged around the rotation axis of the first clutch part.

[0025] A limit assembly is provided between the transmission gear 11 and the first clutch part, which is used to limit the limit distance of relative rotation between the first clutch part and the transmission gear 11 to be less than the maximum allowable deformation of the elastic member 9. In this embodiment, the limit assembly includes a limit groove 6 and a limit block 7 sliding along the limit groove 6, and the limit distance of the limit block 7 sliding along the limit groove 6 is less than the maximum allowable deformation of the elastic member 9. Specifically, the limit groove 6 is provided on the transmission gear 11 and is radially arranged on the outside of the receiving groove, and the limit block 7 is provided on the first clutch part and is radially arranged on the outside of the first clutch part. In this embodiment, two limit grooves 6 are provided, and the two limit grooves 6 are centrally symmetrically arranged around the rotation axis of the transmission gear 11. In order to facilitate processing, the limit groove 6 and the groove can be set to the same shape, and the two limit grooves 6 and the four grooves are evenly distributed along the circumference of the receiving groove.

[0026] The specific implementation process is as follows: when the second clutch part 1 is in a separated state from the first clutch part, the power is cut off between the transmission shaft 10 and the transmission gear 11. At this time, the compression spring is in an extended state. When power transmission is required between the transmission shaft 10 and the transmission gear 11, the second clutch part 1 slides along the transmission shaft 10 toward the first clutch part, so that the pawl 2 on the second clutch part 1 is engaged with the pawl 2 on the first clutch part. In the process of the second clutch part 1 engaging with the first clutch part, the first clutch part reduces the impact during the engagement process by compressing the compression spring with the transmission gear 11, thereby avoiding the occurrence of tooth hitting, and further avoiding the phenomenon of excessive wear or damage to the first clutch part, the second clutch part 1 and the transmission gear 11.

[0027] The above is only an embodiment of the present invention, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. A clutch transmission mechanism, comprising a transmission shaft, a transmission gear rotatably connected to the transmission shaft, a first clutch portion disposed on the transmission gear, a second clutch portion connected to the transmission shaft via a pawl for clutch engagement with the first clutch portion, Features: The first clutch portion is coaxially arranged with the transmission gear, and the first clutch portion is elastically connected with the transmission gear along the rotation direction.

2. A clutch transmission mechanism according to claim 1, Features: The first clutch portion is provided with a protrusion, the transmission gear is provided with a groove for the protrusion to slide, and an elastic member for power transmission between the protrusion and the transmission gear is provided in the groove.

3. A clutch transmission mechanism according to claim 2, Features: The end of the transmission gear is provided with a receiving groove for receiving the first clutch part, the groove is radially arranged along the outer side of the receiving groove, and the protrusion is radially arranged along the outer side of the first clutch part.

4. A clutch transmission mechanism according to claim 3, Features: The elastic member is a compression spring.

5. A clutch transmission mechanism according to claim 3 or 4, Features: A limit assembly is provided between the transmission gear and the first clutch portion, and is used to limit the relative rotation between the first clutch portion and the transmission gear to a limit distance smaller than the maximum allowable deformation of the elastic member.

6. A clutch transmission mechanism according to claim 5, Features: The limiting assembly comprises a limiting groove and a limiting block sliding along the limiting groove, and the limiting distance of the limiting block sliding along the limiting groove is less than the maximum allowable deformation of the elastic member.

7. A clutch transmission mechanism according to claim 6, Features: The limiting groove is arranged radially on the outer side of the containing groove, and the limiting block is arranged radially on the outer side of the first clutch part.

8. A clutch transmission mechanism according to claim 7, Features: The transmission shaft is provided with a rolling element which supports the second clutch part to slide along the axial direction.

9. A clutch transmission mechanism according to claim 8, Features: The transmission shaft is provided with a first slide groove along the axial direction, the second clutch portion is provided with a second slide groove corresponding to the first slide groove, and the rolling element is located between the first slide groove and the second slide groove.

Images