A method and system for installing interference fit between crankshaft and gear cone surface

Abstract

The present invention discloses a method and system for installing a crankshaft and a gear conical surface with interference fit. The installation system for installing a crankshaft and a gear conical surface with interference fit includes: a fixing member detachably connected to the gear end face of the gear; a limiting member arranged opposite to the fixing member and arranged at a distance; an alarm and a power supply; the alarm, the power supply, the fixing member and the limiting member are arranged in series to form an alarm circuit; when the fixing member and the limiting member are in contact, the alarm circuit is in a conducting state, and the alarm sounds an alarm; when the fixing member and the limiting member are in a separated state, the alarm circuit is in a disconnected state, and the alarm does not work. The present invention effectively avoids the phenomenon that the gear is not installed properly or the gear is over-installed, causing plastic deformation. At the same time, the working hours of the gear press-fitting process are shortened, and the installation accuracy of the gear is improved.

Description

Technical Field

[0001] The invention relates to the technical field of interference fit assembly of a crankshaft and a gear conical surface, and in particular to an installation method and system for interference fit assembly of a crankshaft and a gear conical surface. Background Art

[0002] The cone interference fit installation method between the crankshaft and the gear usually adopts the press-in method and the hydraulic method for installation and connection, and the installation accuracy is controlled by controlling the axial displacement or hydraulic pressure of the press-in part.

[0003] In some engines, the gear and crankshaft are connected by a conical interference fit, and the installation accuracy is controlled by positioning pins. The structure is as follows: Figure 3 As shown. According to the product structure, in the existing installation process, hydraulic installation is adopted. The axial displacement of the gear is controlled by controlling the hydraulic pressure and axial thrust of the gear support. After the press-fitting is completed, the distance dimension (D value) from the end face of the gear to the end face of the locating pin is measured to check whether the gear is installed in place. Since the hydraulic pressure and axial thrust of the gear support are greatly affected by the dimensional error, surface roughness and surface lubrication of the parts during installation, the installation accuracy of this process method is poor (the D value has a large deviation). If the D value is too small, additional press-fitting is required, which is time-consuming and labor-intensive; if the D value is too large, plastic deformation will occur on the gear surface, and even the locating pin will be broken. The existing installation process has defects, which has become a technical problem that needs to be urgently solved by process technicians. Summary of the invention

[0004] The purpose of the present invention is to provide a method and system for installing the crankshaft and the gear cone surface with interference fit, which effectively avoids the phenomenon that the gear is not installed properly or the gear is over-installed and plastic deformation occurs. At the same time, the working time of the gear press-fitting process is shortened and the installation accuracy of the gear is improved.

[0005] The technical solution provided by the present invention is as follows:

[0006] A method for installing a crankshaft and a gear cone surface with interference fit, comprising the steps of:

[0007] Align the notch provided on the gear corresponding to the locating pin of the crankshaft with the locating pin;

[0008] The gear is actuated along the axial direction of the crankshaft so that the fixing part installed on the gear end face of the gear approaches the limiting part along with the gear until the alarm sounds an alarm; wherein the fixing part is detachably connected to the gear end face, and the limiting part and the fixing part are arranged opposite to each other and at a distance; the fixing part, the limiting part, the alarm and the power supply are arranged in series to form an alarm circuit; when the fixing part and the limiting part are in contact, the alarm circuit is in a conducting state, and the alarm sounds an alarm; when the fixing part and the limiting part are in a separated state, the alarm circuit is in a disconnected state, and the alarm does not operate.

[0009] In the technical scheme, when installing the gear, the distance value between the limiter and the fixing member is set (satisfying the distance size between the positioning pin and the gear end face), and then the notch and the positioning pin are set, and finally the gear is actuated to be installed along the crankshaft direction. When the fixing member and the limiter are in contact, an alarm is triggered, indicating that the gear is installed in place, and the axial press-fitting of the gear is stopped, thereby effectively avoiding the phenomenon that the gear is not installed in place or the gear is over-installed and the plastic deformation of the gear is caused. More preferably, the whole process of the present invention does not need to stop to check and judge the installation status of the notch and the positioning pin. The operation during the installation process is simple, and the gear installation status can be monitored in real time and feedback is given. There is no need to repeatedly stop the press-fitting and measure, thereby improving the continuity of the assembly process and shortening the working time of the gear press-fitting process from 7 to 10 minutes before the improvement to 3 minutes; at the same time, the installation accuracy is improved, and the over-pressure situation is improved. The D value installation accuracy before the improvement is 0mm to 0.35mm, and the D value installation accuracy after the improvement is 0mm to 0.05mm.

[0010] Further preferably, the actuating the gear along the axial direction of the crankshaft so that the fixing member installed on the gear end surface of the gear approaches the limiting member along with the gear until the alarm device sounds an alarm further comprises the steps of:

[0011] The distance value between the fixing member and the limiting member is adjusted according to the installation distance size between the crankshaft and the gear.

[0012] In the technical solution, the distance between the fixing member and the limiting member can be adaptively adjusted according to the distance sizes between the different positioning pins and the gear end faces, which greatly improves the practicality and application scope of the present invention.

[0013] The present invention also provides an installation system for interference fit between a crankshaft and a conical surface of a gear, comprising:

[0014] A fixing member detachably connected to the gear end face of the gear;

[0015] A limiting member arranged opposite to the fixing member and spaced apart from the fixing member;

[0016] Alarm and power supply;

[0017] The alarm, the power supply, the fixing member and the limiting member are arranged in series to form an alarm circuit;

[0018] When the fixing member is in contact with the limiting member, the alarm circuit is in a conducting state, and the alarm device sounds an alarm;

[0019] When the fixing member and the limiting member are in a separated state, the alarm circuit is in a disconnected state, and the alarm does not operate.

[0020] In the technical scheme, when installing the gear, the distance value between the limiter and the fixing member is set (satisfying the distance size between the positioning pin and the gear end face), and then the notch and the positioning pin are set, and finally the gear is actuated to be installed along the crankshaft direction. When the fixing member and the limiter are in contact, an alarm is triggered, indicating that the gear is installed in place, and the axial press-fitting of the gear is stopped, thereby effectively avoiding the phenomenon that the gear is not installed in place or the gear is over-installed and the plastic deformation of the gear is caused. More preferably, the whole process of the present invention does not need to stop to check and judge the installation status of the notch and the positioning pin. The operation during the installation process is simple, and the gear installation status can be monitored in real time and feedback is given. There is no need to repeatedly stop the press-fitting and measure, thereby improving the continuity of the assembly process and shortening the working time of the gear press-fitting process from 7 to 10 minutes before the improvement to 3 minutes; at the same time, the installation accuracy is improved, and the over-pressure situation is improved. The D value installation accuracy before the improvement is 0mm to 0.35mm, and the D value installation accuracy after the improvement is 0mm to 0.05mm.

[0021] Further preferably, it also includes a shaft member, which is movably inserted into the fixing member and the limiting member in sequence along the axial direction of the crankshaft; the shaft member includes an abutting end arranged close to the gear side and a free end arranged away from the gear side; the abutting end abuts against the positioning pin on the crankshaft.

[0022] In this technical solution, the shaft member acts against the locating pin to avoid displacement of the locating pin during the axial movement of the gear, thereby ensuring the consistency between the set distance between the fixing member and the limiting member and the optimal distance for gear installation, thereby ensuring the installation accuracy of the gear.

[0023] Further preferably, the fixing member is provided with a countersunk hole corresponding to the shaft member, including a large diameter end and a small diameter end, the small diameter end is arranged close to the limit member, and the large diameter end and the small diameter end form a shoulder; the shaft member is provided with a radial protrusion at the large diameter end, and the radial protrusion and the shoulder are provided with a pre-stressed elastic member, and the pre-stressed elastic member enables the abutting end to abut against the positioning pin.

[0024] In the present technical solution, the pre-stressed elastic force of the elastic member ensures that the locating pin always remains in the initial position when the fixing member moves axially with the gear, so that the hard contact between the shaft and the locating pin becomes flexible contact, effectively protecting the locating pin and the shaft while ensuring the installation accuracy of the gear.

[0025] Further preferably, the limiting member comprises an adjusting nut and a limiting nut; the adjusting nut and the limiting nut are threadedly connected to the free end, and the adjusting nut is arranged close to the positioning pin.

[0026] In the present technical solution, the positional relationship between the fixing member and the limiting member during the movement of the gear is ensured by the limiting nut. More preferably, the distance between the fixing member and the limiting member can be adaptively adjusted according to the distance dimensions between different locating pins and the end faces of the gear by adjusting the nut, thereby greatly improving the practicality and scope of application of the present invention.

[0027] Further preferably, the fixing piece is detachably connected to the gear end face in a magnetic manner.

[0028] In this technical solution, when the gear is made of a magnetic material (such as iron, etc.), the magnetic connection avoids the setting of the connection structure between the gear end face and the fixing member, so there is no need to change the existing gear structure, ensuring the integrity, completeness and mechanical strength of the gear structure. In addition, the magnetic connection is easy to disassemble and implement, easy to operate, and low in cost.

[0029] Further preferably, the fixing part is an insulating fixing part, and a first conductive contact is provided on a side of the fixing part close to the limiting part; the alarm, the power supply, the first conductive contact and the limiting part are arranged in series to form the alarm circuit; when the first conductive contact is in contact with the limiting part, the alarm circuit is in a conducting state, and the alarm sounds an alarm; when the first conductive contact is in a separated state from the limiting part, the alarm circuit is in a disconnected state, and the alarm does not operate.

[0030] In the present technical solution, the fixing part is set to be insulated, while the position where the circuit needs to be turned on is set to be conductive, thereby improving the safety system of the present invention and avoiding the probability of electric shock caused by misoperation (for example, when adjusting the distance between the fixing part and the limiting part, the fixing part may contact the limiting part during the adjustment process to turn on the alarm circuit, and a hidden danger of electric shock may occur when the human body contacts the fixing part and / or the limiting part).

[0031] Further preferably, the limit member is an insulating limit member, and a second conductive contact is provided on the side of the limit member close to the fixing member; the alarm, the power supply, the fixing member and the second conductive contact are arranged in series to form the alarm circuit; when the fixing member and the second conductive contact are in contact, the alarm circuit is in a conducting state, and the alarm sounds an alarm; when the fixing member and the second conductive contact are in a separated state, the alarm circuit is in a disconnected state, and the alarm does not operate.

[0032] In the present technical solution, the limiter is set to be insulated, while the position where the circuit needs to be turned on is set to be conductive, thereby improving the safety system of the present invention and avoiding the probability of electric shock caused by misoperation (for example, when adjusting the distance between the fixing member and the limiter, the fixing member may contact the limiter during the adjustment process and turn on the alarm circuit, and there may be a risk of electric shock when the human body contacts the fixing member and / or the limiter).

[0033] The invention provides a method and system for installing a crankshaft and a gear cone surface with interference fit, which can bring at least one of the following beneficial effects:

[0034] 1. In the present invention, when installing the gear, the distance between the limiter and the fixing member is set (satisfying the distance between the locating pin and the gear end face), and then the notch and the locating pin are set, and finally the gear is actuated to be installed along the crankshaft direction. When the fixing member and the limiter are in contact, an alarm is triggered, indicating that the gear is installed in place, and the axial press-fitting of the gear is stopped, thereby effectively avoiding the phenomenon that the gear is not installed in place or the gear is over-installed and the plastic deformation of the gear is caused. More preferably, the whole process of the present invention does not need to stop to check and judge the installation of the notch and the locating pin. The operation during the installation process is simple, and the gear installation can be monitored in real time and feedback is given. There is no need to stop the press-fitting repeatedly for measurement, thereby improving the continuity of the assembly process and shortening the working time of the gear press-fitting process from 7 to 10 minutes before the improvement to 3 minutes; at the same time, the installation accuracy is improved, and the overpressure situation is improved. The D value installation accuracy before the improvement is 0mm to 0.35mm, and the D value installation accuracy after the improvement is 0mm to 0.05mm.

[0035] 2. In the present invention, the distance between the fixing member and the limiting member can be adaptively adjusted according to the distance size between the different positioning pins and the gear end surface, which greatly improves the practicality and application scope of the present invention.

[0036] 3. In the present invention, the shaft member resists the positioning pin, thereby preventing the positioning pin from being displaced during the axial movement of the gear, ensuring the consistency between the distance set between the fixing member and the limiting member and the optimal distance for gear installation, and ensuring the installation accuracy of the gear. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The preferred implementation scheme will be described below in a clear and understandable manner in conjunction with the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the installation method and system for interference fit between the crankshaft and the gear cone surface.

[0038] Figure 1 It is a schematic structural diagram of an embodiment of the installation system of the present invention in which the curved shaft and the conical surface of the gear are interference-fitted;

[0039] Figure 2 It is a schematic diagram of the principle diagram of the present invention;

[0040] Figure 3 It is a schematic diagram of the interference fit structure between the crankshaft and the gear cone surface.

[0041] Description of Figure Numbers:

[0042] 1. Gear, 11. Gear end face, 2. Crankshaft, 21. Locating pin, 211. Locating pin side wall, 3. Fixing part, 311. Large diameter end, 312. Small diameter end, 4. Limiting part, 41. Adjusting nut, 42. Limiting nut, 6. Power supply, 7. Shaft, 71. Abutting end, 72. Free end, 73. Radial protrusion, 8. Pre-stressed elastic part, 91. First magnetic attraction part, 92. Second magnetic attraction part, 10. Alarm. DETAILED DESCRIPTION

[0043] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0044] In order to make the drawings concise, only the parts related to the present invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to make the drawings concise and easy to understand, in some figures, only one of the parts with the same structure or function is schematically drawn, or only one of them is marked. In this article, "one" not only means "only one", but also means "more than one". In this article, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installation", "connection" and "connection" 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 directly connected, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] In the first embodiment, a method for installing a crankshaft and a gear cone surface with interference fit comprises the steps of:

[0046] Align the notch provided on the gear corresponding to the locating pin of the crankshaft with the locating pin;

[0047] The gear is actuated along the axial direction of the crankshaft so that the fixing part installed on the gear end face of the gear approaches the limiting part along with the gear until the alarm sounds an alarm; wherein the fixing part is detachably connected to the gear end face, and the limiting part and the fixing part are arranged opposite to each other and at a distance; the fixing part, the limiting part, the alarm and the power supply are arranged in series to form an alarm circuit; when the fixing part and the limiting part are in contact, the alarm circuit is in a conducting state, and the alarm sounds an alarm; when the fixing part and the limiting part are in a separated state, the alarm circuit is in a disconnected state, and the alarm does not operate.

[0048] In this embodiment, when installing the gear, by setting the distance value between the limiter and the fixing member (satisfying the distance dimension between the positioning pin 21 and the end face of the gear), then the notch and the positioning pin 21 are set, and finally the gear is actuated to be installed along the crankshaft direction. When the fixing member and the limiter are in contact, an alarm is triggered, indicating that the gear is installed in place, and the axial press-fitting of the gear is stopped, thereby effectively avoiding the phenomenon that the gear is not installed in place or the gear is over-installed and the plastic deformation of the gear is caused. More preferably, the whole process of the present invention does not need to stop to check and judge the installation status of the notch and the positioning pin 21. The operation during the installation process is simple, and the gear installation status can be monitored in real time and feedback is given. There is no need to repeatedly stop the press-fitting and measure, thereby improving the continuity of the assembly process and shortening the working time of the gear press-fitting process from 7 to 10 minutes before the improvement to 3 minutes; at the same time, the installation accuracy is improved, and the overpressure situation is improved. The D value installation accuracy before the improvement is 0mm to 0.35mm, and the D value installation accuracy after the improvement is 0mm to 0.05mm.

[0049] In the second embodiment, based on the first embodiment, the gear is actuated along the axial direction of the crankshaft so that the fixing member installed on the gear end face of the gear approaches the limit member along with the gear until the alarm device sounds an alarm, and further includes the steps of:

[0050] The distance value between the fixing member and the limiting member is adjusted according to the installation distance size between the crankshaft and the gear.

[0051] In this embodiment, the distance between the fixing member and the limiting member can be adaptively adjusted according to the distance between the side wall of the positioning pin and the end face of the gear, which greatly improves the practicality and application scope of the present invention. In practical applications, before docking the crankshaft and the gear, first adjust the distance between the fixing member and the limiting member according to the installation type of the crankshaft and the gear (such as Figure 3The installation distance dimension D) is used to set the distance value d between the fixing member and the limiting member 4. It is worth noting that when installing a certain D, the d value can be adjusted at the beginning of the adjustment, and no adjustment is required subsequently.

[0052] In the third embodiment, Figure 1 and 2 As shown, a mounting system for interference fit between a crankshaft and a conical surface of a gear comprises: a fixing member 3 detachably connected to the gear end face 11 of the gear 1; a limiting member 4 arranged opposite to the fixing member 3 and at a distance; an alarm 10 and a power supply 6; the alarm 10, the power supply 6, the fixing member 3 and the limiting member 4 are arranged in series to form an alarm circuit; when the fixing member 3 is in contact with the limiting member 4, the alarm circuit is in a conducting state, and the alarm 10 sounds an alarm; when the fixing member 3 is in a separated state from the limiting member 4, the alarm circuit is in a disconnected state, and the alarm 10 does not operate. In actual applications, before docking the crankshaft 2 and the gear 1, first determine the installation type of the crankshaft 2 and the gear 1 (such as Figure 3 The installation distance dimension D in is used to set the distance value d between the fixing member 3 and the limiting member 4. It is worth noting that D and d may be equal or unequal. Due to the existence of the detachable connection between the fixing member 3 and the gear mounting surface, d may be greater than D or less than D. The specific setting can be made according to the actual situation, that is, when installing a certain D, the d value can be adjusted at the beginning of the adjustment, and no adjustment is required later.

[0053] Specifically, install the hydraulic expansion tool and the hydraulic push tool (or install manually), alternately increase the pressure of the gear expansion tool and the pressure of the hydraulic push tool, and let the gear 1 move axially. The fixing part 3 will move with the gear 1, so that the distance between the fixing part 3 and the limiter 4 becomes smaller and smaller until the gear 1 contacts the pin. At this time, the fixing part 3 contacts the limiter 4, the alarm circuit forms a passage, generates an alarm signal, and stops pressing. The electrical signal has high accuracy and short response time. In practical applications, the alarm mode of the alarm 10 can be light, flashing, whistle, voice, etc.

[0054] In the fourth embodiment, Figure 1 and 2As shown, on the basis of the third embodiment, it also includes a shaft member 7 which is movably inserted in the fixing member 3 and the limiting member 4 in sequence along the axial direction of the crankshaft 2; the shaft member 7 includes a supporting end 71 arranged on the side close to the gear 1 and a free end 72 arranged on the side away from the gear 1; the supporting end 71 is in contact with the positioning pin 21 on the crankshaft 2. Preferably, the fixing member 3 is provided with a countersunk hole corresponding to the shaft member 7, including a large diameter end 311 and a small diameter end 312, the small diameter end 312 is arranged close to the limiting member 4, and the large diameter end 311 and the small diameter end 312 form a shoulder; the shaft member 7 is provided with a radial protrusion 73 at the large diameter end 311, and the radial protrusion 73 and the shoulder are provided with a preload elastic member 8, and the preload elastic member 8 makes the supporting end 71 abut against the positioning pin side wall 211 of the positioning pin 21. Preferably, the limiting member 4 includes an adjusting nut 41 and a limiting nut 42; the adjusting nut 41 and the limiting nut 42 are screwed to the free end 72, and the adjusting nut 41 is arranged close to the positioning pin 21. Preferably, the pre-stressed elastic member 8 is a pre-stressed spring.

[0055] In actual application, install the hydraulic expansion tooling and the hydraulic pushing tooling, alternately increase the pressure of the gear expansion tooling and the pressure of the hydraulic pushing tooling, and let the gear 1 move axially. The fixing part 3 moves with the gear 1, and the shaft part 7 is kept stationary by the elastic force of the pre-stressed elastic part 8. The limiting distance between the fixing part 3 and the limiting part 4 decreases continuously with the increase of the distance from the gear end face 11 to the side wall 211 of the positioning pin until the gear 1 contacts the pin. At this time, the distance between the fixing part 3 and the limiting part 4 is 0, the alarm circuit is in the on state, the alarm 10 generates an alarm signal, and the press fitting is stopped. It is worth noting that the distance value between the fixing part 3 and the limiting part 4 is adjusted by screwing in or out the adjusting nut 41 on the shaft part 7. Specifically, it can be adjusted by the adjustment block provided with the corresponding crankshaft 2 and the processing, and then the adjusting nut 41 is locked by the limiting nut 42, and the accuracy is ensured by the double nut.

[0056] In the fifth embodiment, Figure 1 and 2As shown, on the basis of the third or fourth embodiment, the fixing member 3 is magnetically detachably connected to the gear end face 11. Preferably, the gear end face 11 is provided with a first magnetic member 91 magnetically connected to the gear 1, and the stopper 4 is provided with a second magnetic member 92 on the side close to the fixing member 3, and the first magnetic member 91 and the second magnetic member 92 attract each other. By utilizing the magnetic attraction characteristics of the gear 1 and through the attraction of the first magnetic member 91 and the second magnetic member 92, the detachable connection between the fixing member 3 and the gear 1 is realized. The magnetic connection does not require changing the structural characteristics of the gear 1, and the advantages are obvious. It is worth noting that the number of magnetic members (i.e., the first magnetic member 91 and the second magnetic member 92) can be set to one or more, based on avoiding the shaft shoulder. When the size of the magnetic member along the axial direction of the crankshaft 2 is large, one can be selected; when the size of the magnetic member along the axial direction of the crankshaft 2 is small, two or more can be selected. The magnetic member is preferably a magnet or a component with magnetic attraction. The fixing member 3 and the gear 1 may also be connected in other detachable ways, such as concave-convex fit, snap fit, etc.

[0057] In Example 6, Figure 1 and 2 As shown, on the basis of the third, fourth or fifth embodiment, the fixing member 3 is an insulating fixing member 3, and the fixing member 3 is provided with a first conductive contact on the side close to the limiter 4; the alarm 10, the power supply 6, the first conductive contact and the limiter 4 are arranged in series to form an alarm circuit; when the first conductive contact is in contact with the limiter 4, the alarm circuit is in a conducting state, and the alarm 10 sounds an alarm; when the first conductive contact is in a separated state from the limiter 4, the alarm circuit is in a disconnected state, and the alarm 10 does not act. Preferably, the limiter 4 is an insulating limiter, and the limiter 4 is provided with a second conductive contact on the side close to the fixing member 3; the alarm 10, the power supply 6, the fixing member 3 and the second conductive contact are arranged in series to form an alarm circuit; when the fixing member 3 is in contact with the second conductive contact, the alarm circuit is in a conducting state, and the alarm 10 sounds an alarm; when the fixing member 3 is in a separated state from the second conductive contact, the alarm circuit is in a disconnected state, and the alarm 10 does not act. It is worth noting that when the fixing member 3 is an insulating fixing member, and the fixing member 3 is provided with a first conductive contact on the side close to the limiting member 4; and the limiting member 4 is an insulating limiting member, and the limiting member 4 is provided with a second conductive contact on the side close to the fixing member 3, the first conductive contact point and the second conductive contact point are arranged relative to each other, so that when the fixing member 3 and the limiting member 4 are in contact, the first conductive contact point and the second conductive contact point are in synchronous contact. The first conductive contact point can be arranged at any position of the fixing member 3 and the second conductive contact point can be arranged at any position of the limiting member 4, as long as the first conductive contact point and the second conductive contact point are in synchronous contact when the fixing member 3 and the limiting member 4 are in contact.

[0058] It should be noted that the above embodiments can be freely combined as needed. The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention.

Claims

1. An installation system for interference fit between a crankshaft and a gear cone surface, characterized in that: include: A fixing member detachably connected to the gear end face of the gear; A limiting member arranged opposite to the fixing member and spaced apart from the fixing member; Alarm and power supply; The alarm, the power supply, the fixing member and the limiting member are arranged in series to form an alarm circuit; When the fixing member is in contact with the limiting member, the alarm circuit is in a conducting state, and the alarm device sounds an alarm; When the fixing member is separated from the limiting member, the alarm circuit is disconnected and the alarm does not work; It also includes: a shaft member, which is movably inserted into the fixing member and the limiting member in sequence along the axial direction of the crankshaft; the shaft member includes an abutting end arranged close to the gear side and a free end arranged away from the gear side; the abutting end abuts against a positioning pin on the crankshaft; The fixing member is provided with a countersunk hole corresponding to the shaft member, including a large diameter end and a small diameter end, the small diameter end is arranged close to the limiting member, and the large diameter end and the small diameter end form a shoulder; The shaft member is provided with a radial protrusion at the large diameter end, and the radial protrusion and the shoulder are provided with a preload elastic member, and the preload elastic member enables the abutting end to abut against the positioning pin.

2. The installation system for interference fit between the crankshaft and the gear cone surface according to claim 1, characterized in that: The limiting member includes an adjusting nut and a limiting nut; The adjusting nut and the limiting nut are screwed to the free end, and the adjusting nut is arranged close to the positioning pin.

3. The installation system for interference fit between the crankshaft and the gear cone surface according to claim 1 or 2, characterized in that: The fixing piece is detachably connected to the gear end surface by magnetic attraction.

4. The installation system for interference fit between the crankshaft and the gear cone surface according to claim 1 or 2, characterized in that: The fixing member is an insulating fixing member, and a first conductive contact is provided on a side of the fixing member close to the limiting member; The alarm, the power supply, the first conductive contact and the limiter are arranged in series to form the alarm circuit; When the first conductive contact is in contact with the limiter, the alarm circuit is in a conducting state, and the alarm device sounds an alarm; When the first conductive contact is in a separated state from the limiting member, the alarm circuit is in a disconnected state, and the alarm does not operate.

5. The installation system for interference fit between the crankshaft and the gear cone surface according to claim 1 or 2, characterized in that: The limiting member is an insulating limiting member, and a second conductive contact is provided on a side of the limiting member close to the fixing member; The alarm, the power supply, the fixing member and the second conductive contact are arranged in series to form the alarm circuit; When the fixing member is in contact with the second conductive contact, the alarm circuit is in a conducting state, and the alarm device sounds an alarm; When the fixing member and the second conductive contact are in a separated state, the alarm circuit is in a disconnected state, and the alarm does not operate.

6. A method for installing a crankshaft and a gear cone surface with interference fit, characterized in that: The mounting system for interference fit between a crankshaft and a conical surface of a gear as claimed in any one of claims 1 to 5 comprises: Align the notch provided on the gear corresponding to the locating pin of the crankshaft with the locating pin; The gear is actuated along the axial direction of the crankshaft so that the fixing part installed on the gear end face of the gear approaches the limiting part along with the gear until the alarm sounds an alarm; wherein the fixing part is detachably connected to the gear end face, and the limiting part and the fixing part are arranged opposite to each other and at a distance; the fixing part, the limiting part, the alarm and the power supply are arranged in series to form an alarm circuit; when the fixing part and the limiting part are in contact, the alarm circuit is in a conducting state, and the alarm sounds an alarm; when the fixing part and the limiting part are in a separated state, the alarm circuit is in a disconnected state, and the alarm does not operate.

7. The installation method of interference fit between the crankshaft and the gear cone surface according to claim 6, characterized in that: The step of actuating the gear along the axial direction of the crankshaft so that the fixing member installed on the gear end surface of the gear approaches the limiting member along with the gear until the alarm device sounds an alarm also includes the following steps: The distance value between the fixing member and the limiting member is adjusted according to the installation distance size between the crankshaft and the gear.

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