Clutch fastening type coupler device for chain saw engine test and use method

Abstract

The invention discloses a clutch fastening type coupler device for a chain saw engine test and a using method. The clutch fastening type coupler device comprises a clutch driving disc arranged on an output shaft of a chain saw engine in a sleeving mode and a fastening type coupler arranged on the output shaft in a sleeving mode. The fastening type coupler comprises a connecting disc arranged on the output shaft in a sleeving mode and a taper fastener arranged between the connecting disc and the output shaft in an inserted mode, the taper fastener is connected with the connecting disc through a fastening bolt, and the clutch driving disc is contained in the end face, close to the chain saw engine, of the connecting disc. The method comprises the steps that firstly, the clutch fastening type coupler device is installed; secondly, power transmission of the clutch fastening type coupler device is conducted; and thirdly, the clutch fastening type coupler device is disassembled. The device is reasonable in design and convenient to operate, power transmission under the condition that the output shaft of the chain saw engine is an optical shaft is achieved through the connecting disc and the taper fastener, a chain saw engine test is facilitated, and the test stability is improved.

Description

Technical Field

[0001] This invention belongs to the field of gasoline chainsaw engine testing technology, and in particular relates to a clutch-fastening coupling device and its usage method for testing chainsaw engines. Background Technology

[0002] A chainsaw engine powers a gasoline chainsaw. To determine the power performance of a gasoline chainsaw, an engine test bench is needed to test the chainsaw engine. During the chainsaw engine bench test, a coupling is required to connect the chainsaw engine output shaft to the dynamometer spindle. Chainsaw engines are generally single-cylinder gasoline engines, characterized by high speed and high vibration during operation.

[0003] Traditional chainsaw engine couplings typically use a threaded structure, where the coupling is screwed onto the external thread of the chainsaw engine's output shaft. This type of coupling carries the risk of the threads loosening during testing, causing the coupling to detach and potentially damaging the engine and equipment. Furthermore, it is unsuitable for chainsaw engine output shafts that are smooth shafts.

[0004] Therefore, there is currently a lack of a reasonably designed clutch-fastening coupling device and its usage method for testing chainsaw engines, which can achieve power transmission from the output shaft of the chainsaw engine to a bare shaft through a connecting plate and a tapered fastener, thus facilitating chainsaw engine testing. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a clutch-type coupling device for testing chainsaw engines, which is reasonably designed and easy to operate. Through the connecting plate and the tapered fastener, the power transmission of the chainsaw engine is realized under the condition that the output shaft is an optical shaft, which is convenient for testing chainsaw engines.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a clutch fastening coupling device for testing a chainsaw engine, comprising a clutch drive disc sleeved on the output shaft of the chainsaw engine and a fastening coupling sleeved on the output shaft; The fastening coupling includes a connecting disc sleeved on the output shaft and a tapered fastener inserted between the connecting disc and the output shaft. The tapered fastener and the connecting disc are connected by fastening bolts. The clutch drive disc is housed in the end face of the connecting disc near the chainsaw engine.

[0007] In the aforementioned clutch fastening coupling device for testing a chainsaw engine, the clutch drive disc is threadedly mounted on the output shaft, and the end face of the clutch drive disc is close to the inner surface of the connecting disc and the end face of the tapered fastener.

[0008] The aforementioned clutch-fastening coupling device for testing a chainsaw engine further includes a connecting disc comprising an integrally formed first ring disc body, an intermediate connecting body, and a second ring disc body, wherein the first ring disc body and the intermediate connecting body are provided with mounting holes for inserting a tapered fastener. The second ring disc has a countersunk hole on the end face near the chainsaw engine, and the clutch drive disc is accommodated in the countersunk hole.

[0009] The aforementioned clutch fastening coupling device for testing a chainsaw engine is further provided in that the tapered fastener includes an annular body and a frustum integrally formed with the annular body. A central cylindrical hole is provided through the interior of the annular body and the frustum. A longitudinal slit communicating with the central cylindrical hole is provided on the annular body and the frustum. The longitudinal slit is arranged along the length direction of the annular body and the frustum. The tapered fastener is fitted onto the output shaft through a central cylindrical hole.

[0010] The aforementioned clutch-fastening coupling device for testing a chainsaw engine further includes a mounting hole comprising a cylindrical mounting hole and a frustum-shaped mounting hole communicating with the cylindrical mounting hole. The cylindrical mounting hole penetrates the first annular disc and extends into the intermediate connecting body, while the frustum-shaped mounting hole is located within the remaining intermediate connecting body. The frustum-shaped body is inserted into the frustum-shaped mounting hole and sleeved on the output shaft, while the annular disc is located within the cylindrical mounting hole.

[0011] The aforementioned clutch-fastening coupling device for testing a chainsaw engine is further provided with a plurality of evenly distributed first threaded holes in the intermediate connecting body, the first threaded holes being arranged around the circumference of the mounting hole. The outer diameter of the annular body is larger than the large diameter of the frustum body. The annular body extending out of the frustum body has a plurality of evenly distributed second threaded holes and through holes, which are arranged alternately. The fastening bolt passes through the through hole and the first threaded hole to connect the annulus and the connecting disc into one unit.

[0012] In the aforementioned clutch-fastening coupling device for testing a chainsaw engine, two symmetrically arranged pin holes are provided on the portion of the first ring disc extending from the cylindrical mounting hole, and pins are installed in the pin holes.

[0013] In the aforementioned clutch-fastening coupling device for testing a chainsaw engine, a clearance hole is further provided in the end face of the second ring disc near the chainsaw engine. The clearance hole is located between the countersunk hole and the conical mounting hole, and the clearance hole, the countersunk hole, and the conical mounting hole are all connected and their center lines coincide.

[0014] Simultaneously, a method for using a clutch-fastening coupling device for testing chainsaw engines is provided, the method comprising the following steps: Step 1: Installation of the clutch-locking coupling device: Step 101: Insert the tapered fastener into the connecting plate, pass the fastening bolt through the through hole and the first threaded hole, connect the tapered fastener to the connecting plate, and do not tighten the fastening bolt. Step 102: Install the connecting plate equipped with the tapered fastener onto the output shaft of the chainsaw engine, and install the countersunk hole of the connecting plate onto the outside of the clutch drive plate of the chainsaw engine. Step 103: After the clutch drive plate is fully embedded, tighten the fastening bolts. After the tapered surface of the tapered fastener is stressed, the longitudinal gap of the tapered fastener shrinks, and the tapered fastener is fastened to the output shaft, thereby fastening the connecting plate to the output shaft of the chainsaw engine. Step 2: Power transmission of the clutch-locking coupling device: Step 201: Install and secure the pin in the pin hole, and connect it to the main shaft connecting plate of the dynamometer through the pin; Step 202: During the bench test of the chainsaw engine, when the speed of the chainsaw engine is lower than the clutch engagement speed, the power transmission of the output shaft of the chainsaw engine is achieved solely by the tapered fastener; when the speed of the chainsaw engine increases to a level higher than the clutch engagement speed, the clutch drive plate fixed on the output shaft intervenes in the power transmission. Step 3: Disassembly of the clutch-locking coupling assembly: Step 301: Loosen the fastening bolt until it is removed, screw the removed fastening bolt into the second threaded hole on the tapered fastener, and press it against the bottom of the cylindrical mounting hole; Step 302: Tighten the fastening bolt evenly. With the head of the fastening bolt limited by the connecting plate, the fastening bolt only rotates. In this way, with the fastening bolt and the tapered fastener connected by threads, the tapered fastener moves along the fastening bolt, and the tapered fastener gradually disengages from the connecting plate and the output shaft, thereby removing the tapered fastener and the connecting plate.

[0015] Compared with the prior art, the present invention has the following advantages: 1. The present invention has a simple structure, reasonable design, and is easy to install and deploy, with stable and reliable connection.

[0016] 2. The tapered fastener in this invention is designed to secure the connecting disc to the output shaft. Compared with conventional key or spline connections, it provides a better secure connection and is easier to install, solving the problems of loose connections or inconvenient installation in traditional connection methods.

[0017] 3. The fastening coupling of this invention can not only realize the transmission of power from the output shaft, but also prevent the clutch from loosening and falling off the output shaft. It is suitable for the case where the output shaft connection part is a bare shaft, which is different from the current threaded connection method of couplings.

[0018] 4. The present invention is provided with a connecting plate, which serves both to house the clutch drive plate within the end face of the connecting plate near the chainsaw engine and to secure the tapered fastener. The overall structure is compact and can achieve both direct power transmission from the chainsaw engine through the output shaft and power transmission through the clutch.

[0019] 5. The tapered fastener and the connecting plate of the present invention are connected by fastening bolts. The axial clamping force of the fastening bolts is changed by the tapered structure into a force that grips the output shaft and the connecting plate, thus fastening them as one, thereby improving the fastening effect.

[0020] 6. The most significant feature of this invention is that the power is transmitted between the output shaft of the dynamometer and the chainsaw engine via a fastening coupling with an optical shaft, which is lower than the clutch engagement speed. Once the speed is higher than the clutch engagement speed, the centrifugal blocks on the clutch drive disc on the output shaft move radially outward under the action of centrifugal force and contact the inner wall of the countersunk hole of the second ring disc in the connecting disc. At this time, the clutch also participates in transmitting power.

[0021] In summary, this invention is reasonably designed and easy to operate. By using a connecting plate and a tapered fastener, it enables the transmission of power from the output shaft of the chainsaw engine to a smooth shaft, which facilitates chainsaw engine testing and improves test stability.

[0022] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the present invention.

[0024] Figure 2 This is a schematic diagram of the connecting disk of the present invention.

[0025] Figure 3 This is a schematic diagram of the internal structure of the connecting disk of the present invention.

[0026] Figure 4 for Figure 3 The right view.

[0027] Figure 5 This is a schematic diagram of the tapered fastener of the present invention.

[0028] Figure 6 for Figure 5 The right view.

[0029] Figure 7 This is a flowchart illustrating the usage method of the present invention.

[0030] Explanation of reference numerals in the attached figures: 1—Chainsaw engine; 2—Output shaft; 3—Clutch drive plate; 4—Connecting disc; 4-1—Counterhead hole; 4-3—Conical mounting hole; 4-4—First threaded hole; 4-5—Pin; 4-6—Cylindrical mounting hole; 4-7—First annular disc; 4-8—Intermediate connecting body; 4-9—Second ring disc; 4-10—Displacement hole; 4-11—Pin hole; 5—Tapered fastener; 5-1—Longitudinal slot; 5-2—Second threaded hole; 5-3—Through hole; 5-4—Central cylindrical hole; 5-5—Frustum-shaped body; 5-6—Ring; 6—Fasting bolt. Detailed Implementation

[0031] like Figures 1 to 6 The clutch fastening coupling device for testing a chainsaw engine shown includes a clutch drive disc 3 sleeved on the output shaft 2 of the chainsaw engine 1 and a fastening coupling sleeved on the output shaft 2. The fastening coupling includes a connecting disc 4 sleeved on the output shaft 2 and a tapered fastener 5 inserted between the connecting disc 4 and the output shaft 2. The tapered fastener 5 and the connecting disc 4 are connected by fastening bolts 6. The clutch drive disc 3 is housed in the end face of the connecting disc 4 near the chainsaw engine 1.

[0032] In this embodiment, the clutch drive plate 3 is threaded onto the output shaft 2, and the end face of the clutch drive plate 3 is close to the inner surface of the connecting plate 4 and the end face of the tapered fastener 5.

[0033] In this embodiment, the connecting disc 4 includes an integrally formed first ring disc body 4-7, an intermediate connecting body 4-8, and a second ring disc body 4-9. The first ring disc body 4-7 and the intermediate connecting body 4-8 are provided with mounting holes for inserting the tapered fastener 5. The second ring disc 4-9 has a countersunk hole 4-1 on the end face near the chainsaw engine 1, and the clutch drive disc 3 is accommodated in the countersunk hole 4-1.

[0034] In this embodiment, the tapered fastener 5 includes an annular body 5-6 and a frustum 5-5 integrally formed with the annular body 5-6. A central cylindrical hole 5-4 is provided through the interior of the annular body 5-6 and the frustum 5-5. A longitudinal slit 5-1 communicating with the central cylindrical hole 5-4 is provided on the annular body 5-6 and the frustum 5-5. The longitudinal slit 5-1 is arranged along the length direction of the annular body 5-6 and the frustum 5-5. The tapered fastener 5 is fitted onto the output shaft 2 through the central cylindrical hole 5-4.

[0035] In this embodiment, the mounting hole includes a cylindrical mounting hole 4-6 and a frustum-shaped mounting hole 4-3 communicating with the cylindrical mounting hole 4-6. The cylindrical mounting hole 4-6 penetrates the first annular disc 4-7 and extends into the intermediate connecting body 4-8. The frustum-shaped mounting hole 4-3 is located within the remaining intermediate connecting body 4-8. The frustum 5-5 is inserted into the frustum mounting hole 4-3 and sleeved on the output shaft 2, and the annulus 5-6 is located inside the cylindrical mounting hole 4-6.

[0036] In this embodiment, the intermediate connecting body 4-8 is provided with a plurality of evenly distributed first threaded holes 4-4, which are arranged around the circumference of the mounting hole. The outer diameter of the annular body 5-6 is larger than the large diameter of the frustum body 5-5. The annular body 5-6 extending out of the frustum body 5-5 has a plurality of evenly distributed second threaded holes 5-2 and through holes 5-3, which are arranged alternately. The fastening bolt 6 passes through the through hole 5-3 and the first threaded hole 4-4 to connect the annulus 5-6 and the connecting disc 4 into one unit.

[0037] In this embodiment, the portion of the first annular disc 4-7 extending out of the cylindrical mounting hole 4-6 is provided with two symmetrically arranged pin holes 4-11, and a pin 4-5 is installed in the pin holes 4-11.

[0038] In this embodiment, a clearance hole 4-10 is also provided in the end face of the second ring disc 4-9 near the chainsaw engine 1. The clearance hole 4-10 is located between the countersunk hole 4-1 and the conical mounting hole 4-3. The clearance hole 4-10, the countersunk hole 4-1, and the conical mounting hole 4-3 are all connected and their center lines coincide.

[0039] In this embodiment, during actual use, there is a through hole 5-3 between two adjacent second threaded holes 5-2, and the number of second threaded holes 5-2, through holes 5-3, and first threaded holes 4-4 are all 3. In actual use, this number can be adjusted and is not specifically limited.

[0040] In this embodiment, the clutch drive plate 3 is a centrifugal clutch that comes with the gasoline chainsaw engine, which is a device already in use in the field.

[0041] In this embodiment, the tapered fastener 5 is provided to fasten the connecting disc 4 to the output shaft 2. Compared with conventional flat key or spline connections, it provides better fastening and is easier to install, solving the problem of loose connections or inconvenient installation in traditional connection methods.

[0042] In addition, its fastening coupling can not only transmit power to the output shaft, but also prevent the clutch from loosening and falling off the output shaft 2. It is suitable for the case where the connection part of the output shaft 2 is a bare shaft, which is different from the current threaded connection method of couplings.

[0043] In this embodiment, a longitudinal slit 5-1 is provided and arranged along the length of the annular body 5-6 and the frustum 5-5. This serves two purposes: firstly, it allows the tapered fastener 5 to pass through the connecting disc 4 and be fitted onto the output shaft 2 via the central cylindrical hole 5-4; secondly, it allows the fastening bolt 6 to be tightened through the through hole 5-3 and the first threaded hole 4-4 when fitted onto the output shaft 2, thereby reducing the gap in the longitudinal slit 5-1 and ensuring that the inner wall of the frustum 5-5 is in close contact with the output shaft 2, thus securing the connection. Furthermore, this structure also reduces the difficulty of machining. Under conditions where machining requirements are not high, it ensures normal operation under high-speed conditions. In this embodiment, it should be noted that the frustum 5-5 is slightly larger than the frustum mounting hole 4-3, and the diameter of the central cylindrical hole 5-4 is the same as that of the output shaft 2, in order to ensure the fastening effect.

[0044] Furthermore, in actual use, the taper of the frustum 5-5 and the frustum mounting hole 4-3 are the same. On the same cross section, the outer surface diameter of the frustum 5-5 is 0.5mm larger than the hole diameter of the frustum mounting hole 4-3. This dimension is not specifically limited, as long as it meets the usage requirements.

[0045] In this embodiment, it should be noted that when the frustum 5-5 is inserted into the frustum mounting hole 4-3 under the action of the fastening bolt 6, the axial force of the fastening bolt 6 is converted into a radial clamping force by the conical surface fit; at the same time, the longitudinal slot 5-1 provides structural space for it to generate the necessary elastic deformation under the action of the radial clamping force, so that the frustum 5-5 contracts to hug the output shaft 2.

[0046] In this embodiment, the connecting plate 4 is provided both to accommodate the clutch drive plate 3 within the end face of the connecting plate 4 near the chainsaw engine 1 and to secure the tapered fastener 5. The overall structure is compact and can both transmit power from the chainsaw engine 1 and allow the clutch to participate in the power transmission.

[0047] In this embodiment, the tapered fastener 5 and the connecting disc 4 are connected by fastening bolts 6. The axial clamping force of the fastening bolts 6 is changed by the tapered structure into a force that grips the output shaft and the connecting disc, thus fastening them together as one, thereby improving the fastening effect.

[0048] In this embodiment, it should be noted that the optical shaft portion of the output shaft 2 is relatively thin, typically with a diameter of 10mm. At high speeds (greater than 6000r / min), vibrations may occur, potentially leading to shaft breakage. Therefore, a clutch drive disc 3 is provided, housed within a connecting disc 4 and a fastening coupling. Power transmission is achieved through a combination of the clutch and the fastening coupling.

[0049] In this embodiment, the through hole 5-3 and the first threaded hole 4-4 are provided so that the fastening bolt 6 can pass through the through hole 5-3 and the first threaded hole 4-4, so that the ring 5-6 and the connecting plate 4 can be connected as one unit.

[0050] In this embodiment, during actual installation, the pin 4-5 can be threaded into the pin hole 4-11 or installed with an interference fit; it is also necessary to weld the inner end of the pin 4-5 to the inner wall of the pin hole 4-11 so that the pin 4-5 and the first ring disc 4-7 are fixedly connected.

[0051] Pins 4-5 are used for connection to the dynamometer mounting plate, following a standard connection method. This connection to the dynamometer spindle mounting plate enables power transmission between the chainsaw engine output shaft and the dynamometer spindle, allowing for successful testing.

[0052] In this embodiment, it should be noted that the connection between the cylindrical pin 4-5 and the dynamometer connecting plate can refer to the connection method of the cylindrical pin and the third connecting plate in patent CN113567139B, "A Gasoline Chainsaw Engine Testing System and Its Usage Method".

[0053] In this embodiment, the first threaded hole 4-4 is located on the edge of the conical mounting hole 4-3 extending from the intermediate connector 4-8. One end of the first threaded hole 4-4 is connected to the cylindrical mounting hole 4-6, and the other end of the first threaded hole 4-4 is connected to the countersunk hole 4-1.

[0054] In this embodiment, one end of the first threaded hole 4-4 is connected to the cylindrical mounting hole 4-6, and the other end of the first threaded hole 4-4 is connected to the countersunk hole 4-1. This is to allow the first threaded hole 4-4 to be arranged in a through manner, which reduces weight on the one hand, and can be adapted to fastening bolts 6 of different lengths and specifications on the other hand, thus having good versatility.

[0055] In this embodiment, the clearance hole 4-10 is located between and connected to the countersunk hole 4-1 and the cone mounting hole 4-3. This is to allow clearance for the nut of the clutch drive plate 3 when it is fitted onto the output shaft 2, so that the nut can be embedded in the clearance hole 4-10. With the clearance hole 4-10 and the cone mounting hole 4-3 connected, the end of the tapered fastener 5 can be positioned close to the end face of the clutch drive plate 3 to prevent the clutch drive plate 3 from loosening and falling off.

[0056] In this embodiment, during actual installation, the gap between the outer edge of the clutch drive disc 3 and the inner edge of the second ring disc 4-9 is in the range of (0, 1mm), that is, greater than 0 and less than or equal to 1mm, as long as it can be installed. The clutch engagement speed is related to this gap. If the gap is small, the engagement speed is relatively low. When the clutch is engaged, the engine speed of the chainsaw engine 1 is generally in the range of 3500r / min to 5500r / min.

[0057] In this embodiment, the most significant feature of the device is that the speed is lower than the clutch engagement speed. The power is transmitted between the dynamometer and the output shaft 2 of the chainsaw engine 1 via a fastening coupling of the optical shaft. Once the speed is higher than the clutch engagement speed, the centrifugal sling on the clutch drive plate 3 moves radially outward under the action of centrifugal force and contacts the inner wall of the countersunk hole 4-1 of the second ring disc 4-9 in the connecting plate 4. At this time, the clutch also participates in transmitting power.

[0058] like Figure 7 As shown, a method for using a clutch-fastening coupling device for testing a chainsaw engine includes the following steps: Step 1: Installation of the clutch-locking coupling device: Step 101: Insert the tapered fastener 5 into the connecting plate 4, pass the fastening bolt 6 through the through hole 5-3 and the first threaded hole 4-4, connect the tapered fastener 5 to the connecting plate 4, and do not tighten the fastening bolt 6. Step 102: Install the connecting plate 4 equipped with the tapered fastener 5 onto the output shaft 2 of the chainsaw engine 1, and install the countersunk hole 4-1 of the connecting plate 4 onto the outside of the clutch drive plate 3 of the chainsaw engine. Step 103: After the clutch drive plate 3 is fully embedded, tighten the fastening bolt 6. After the tapered surface of the tapered fastener 5 is stressed, the longitudinal slot 5-1 of the tapered fastener 5 shrinks, and the tapered fastener 5 is fastened to the output shaft 2, thereby fastening the connecting plate 4 to the output shaft 2 of the chainsaw engine 1. Step 2: Power transmission of the clutch-locking coupling device: Step 201: Install and fix the pin 4-5 in the pin hole 4-11, and connect it to the main shaft connecting plate of the dynamometer through the pin 4-5; Step 202: When the chainsaw engine 1 is subjected to bench test, when the speed of the chainsaw engine 1 is lower than the clutch engagement speed, the power transmission of the output shaft 2 of the chainsaw engine 1 is achieved solely by the tapered fastener 5; when the speed of the chainsaw engine 1 increases to a level higher than the clutch engagement speed, the clutch drive plate 3 fixed on the output shaft 2 intervenes in the power transmission. Step 3: Disassembly of the clutch-locking coupling assembly: Step 301: Loosen the fastening bolt 6 until it is removed, screw the removed fastening bolt 6 into the second threaded hole 5-2 on the tapered fastener 5, and abut it against the bottom of the cylindrical mounting hole 4-6; Step 302: Tighten the fastening bolt 6 evenly. With the head of the fastening bolt 6 limited by the connecting plate 4, the fastening bolt 6 only rotates. In this way, with the fastening bolt 6 and the tapered fastener 5 connected by threads, the tapered fastener 5 moves along the fastening bolt 6, and the tapered fastener 5 gradually disengages from the connecting plate 4 and the output shaft 2, thereby removing the tapered fastener 5 and the connecting plate 4.

[0059] In summary, this invention is reasonably designed and easy to operate. By using a connecting plate and a tapered fastener, it enables the transmission of power from the output shaft of the chainsaw engine to a smooth shaft, which facilitates chainsaw engine testing and improves test stability.

[0060] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the present invention. Any simple modifications, alterations, or equivalent structural changes made to the above embodiments based on the technical essence of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A clutch fastened coupling device for testing a chainsaw engine, characterized in that: The clutch driving disc (3) is sleeved on the output shaft (2) of the chainsaw engine (1), and the fastening type coupling is sleeved on the output shaft (2); The fastening type coupling comprises a connecting disc (4) sleeved on the output shaft (2) and a taper fastener (5) inserted between the connecting disc (4) and the output shaft (2), the taper fastener (5) and the connecting disc (4) are connected by a fastening bolt (6), and the clutch driving disc (3) is accommodated in the end face of the connecting disc (4) close to the chainsaw engine (1).

2. A clutch tight coupling device for testing a chain saw engine according to claim 1, characterized in that The clutch driving disc (3) is threadedly installed on the output shaft (2), and the end face of the clutch driving disc (3) is close to the inner surface of the connecting disc (4) and the end face of the taper fastener (5).

3. A clutch fastening type coupling device for testing a chain saw engine according to claim 1, wherein: The connecting disc (4) comprises a first ring disc body (4-7), an intermediate connecting body (4-8) and a second ring disc body (4-9) which are integrally formed, and mounting holes for inserting the taper fastener (5) are formed in the first ring disc body (4-7) and the intermediate connecting body (4-8); The second ring disc body (4-9) is provided with a countersunk hole (4-1) in the end face close to the chainsaw engine (1), and the clutch driving disc (3) is accommodated in the countersunk hole (4-1).

4. A clutch tight coupling device for testing chain saw engines according to claim 3, characterized in that: The taper fastener (5) comprises a circular ring body (5-6) and a conical body (5-5) integrally formed with the circular ring body (5-6), a central cylindrical hole (5-4) is formed in the inside of the circular ring body (5-6) and the conical body (5-5), longitudinal slits (5-1) which communicate with the central cylindrical hole (5-4) are formed on the circular ring body (5-6) and the conical body (5-5), and the longitudinal slits (5-1) are arranged along the length direction of the circular ring body (5-6) and the conical body (5-5). The taper fastener (5) is sleeved on the output shaft (2) through the central cylindrical hole (5-4).

5. A clutch fastening type coupling device for testing a chain saw engine according to claim 4, wherein: The mounting hole comprises a cylindrical mounting hole (4-6) and a conical mounting hole (4-3) which communicates with the cylindrical mounting hole (4-6), the cylindrical mounting hole (4-6) penetrates through the first ring disc body (4-7) and extends into the intermediate connecting body (4-8), and the conical mounting hole (4-3) is located in the remaining intermediate connecting body (4-8); the conical body (5-5) is inserted into the conical mounting hole (4-3) and is sleeved on the output shaft (2), and the circular ring body (5-6) is located in the cylindrical mounting hole (4-6).

6. A clutch tight coupling device for testing a chain saw engine according to claim 4, characterized in that: A plurality of first threaded holes (4-4) which are uniformly distributed are formed in the intermediate connecting body (4-8), and the first threaded holes (4-4) are arranged in the circumferential direction of the mounting hole; The outer diameter of the circular ring body (5-6) is greater than the large diameter part of the conical body (5-5), a plurality of second threaded holes (5-2) and through holes (5-3) which are uniformly distributed are formed on the circumference of the conical body (5-5) where the circular ring body (5-6) protrudes, and the second threaded holes (5-2) and the through holes (5-3) are arranged alternately; The fastening bolt (6) penetrates through the through hole (5-3) and the first threaded hole (4-4) to connect the circular ring body (5-6) and the connecting disc (4) into one.

7. A clutch tight coupling device for testing chain saw engines according to claim 5, characterized in that: The part of the first ring disc body (4-7) extending out of the cylindrical mounting hole (4-6) is provided with two symmetrical pin holes (4-11), and a pin (4-5) is mounted in the pin hole (4-11).

8. A clutch tight coupling device for testing a chain saw engine according to claim 5, characterized in that: The second ring disc body (4-9) is further provided with a clearance hole (4-10) near the end face of the oil saw engine (1), the clearance hole (4-10) is located between the counterbore (4-1) and the conical mounting hole (4-3), and the clearance hole (4-10), the counterbore (4-1) and the conical mounting hole (4-3) are in communication and the center lines coincide.

9. A method of using the device of claim 6, the method comprising the steps of: Step one, installation of the clutch fastening type shaft coupling device: Step 101, insert the taper fastener (5) into the connecting disc (4), pass the fastening bolt (6) through the through hole (5-3) and the first threaded hole (4-4), connect the taper fastener (5) with the connecting disc (4), and do not tighten the fastening bolt (6); Step 102, install the connecting disc (4) provided with the taper fastener (5) on the output shaft (2) of the oil saw engine (1), and install the counterbore (4-1) of the connecting disc (4) outside the clutch driving disc (3) of the oil saw engine; Step 103, after the clutch driving disc (3) is completely embedded, tighten the fastening bolt (6), the taper surface of the taper fastener (5) is stressed, the longitudinal slit (5-1) of the taper fastener (5) is reduced, the taper fastener (5) is fastened on the output shaft (2), so that the connecting disc (4) is fastened on the output shaft (2) of the oil saw engine (1); Step two, power transmission of the clutch fastening type shaft coupling device: Step 201, install the pin (4-5) in the pin hole (4-11) and fix it, connect the pin (4-5) with the dynamometer main shaft connecting disc; Step 202, during the bench test of the oil saw engine (1), when the rotating speed of the oil saw engine (1) is lower than the clutch engagement speed, only the taper fastener (5) is used to realize the power transmission of the output shaft (2) of the oil saw engine (1); when the rotating speed of the oil saw engine (1) is higher than the clutch engagement speed, the clutch driving disc (3) fixed on the output shaft (2) is involved in the power transmission; Step three, disassembly of the clutch fastening type shaft coupling device: Step 301, unscrew the fastening bolt (6) until it is removed, and screw the removed fastening bolt (6) into the second threaded hole (5-2) of the taper fastener (5) and abut against the hole bottom of the cylindrical mounting hole (4-6); Step 302, uniformly screw the fastening bolt (6), the head of the fastening bolt (6) is limited by the connecting disc (4), and the fastening bolt (6) only rotates, so that the taper fastener (5) moves along the fastening bolt (6) under the threaded connection of the fastening bolt (6) and the taper fastener (5), the taper fastener (5) gradually comes out of the connecting disc (4) and the output shaft (2), and thus the taper fastener (5) and the connecting disc (4) are disassembled.

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