CN111457067A - Cam coaxial sine movement mechanism and equipment adopting same - Google Patents

Abstract

The application discloses coaxial sinusoidal motion mechanism of cam and adopt its equipment, this mechanism realizes reciprocating linear motion and rotary motion's conversion through the cooperation of eccentric circular camshaft and reciprocating motion pole, and this mechanism includes eccentric circular camshaft, reciprocating motion pole, motion restraint organism, bent axle. The mechanism has reasonable motion, only has rotating centrifugal force, does not have high-order shake, is extremely easy to balance, has no vibration, has high mechanical efficiency and volumetric efficiency, has high energy consumption utilization rate, reduces emission and has good energy-saving effect.

Description

Cam coaxial sine movement mechanism and equipment adopting same

Technical Field

The invention relates to a conjugate sinusoidal reciprocating rotary motion mechanism, in particular to a sinusoidal motion mechanism with coaxial cams, and simultaneously relates to equipment adopting the sinusoidal motion mechanism with coaxial cams.

Background

In the prior art, a conversion mechanism of rotation and reciprocating linear motion is generally a crank-link mechanism, but the crank-link mechanism has obvious defects, because of the structural characteristics of a crank link, lateral pressure exists in the link motion process, the mechanical efficiency and the volumetric efficiency are low, and many progress has been made on the improvement research of the crank-link mechanism, but the existing improved mechanism still has the following problems: the vibration is difficult to balance in the mechanism movement process, high-order vibration exists, and the balance mechanism is complex; the high-low pressure backflow phenomenon of the cylinder is serious during high-speed movement.

Disclosure of Invention

The invention aims to provide a conjugate sine reciprocating rotary motion mechanism aiming at the defects in the prior art, wherein the rotary reciprocating conversion side pressure resultant force is zero, and the two ends of the reciprocating motion mechanism have no side pressure, so that the mechanical efficiency is high.

In order to achieve the purpose, the invention adopts the following scheme:

the coaxial sinusoidal motion mechanism of cam includes: eccentric circular cam axle, reciprocating motion pole, motion restraint organism, bent axle. The eccentric circular cam shaft is formed by uniformly distributing 3 eccentric circular cams at 120 degrees on a rotating shaft, and the cam shaft can be an independent part or a combined part. The reciprocating rod is configured to: each cam corresponds to a reciprocating motion rod, the middle part of the rod is provided with a hole matched with the eccentric circular cam, the rod can be of a sliding block structure or a sliding plug structure, and can also form assemblies and parts with parts required by different functions and purposes, and the reciprocating motion rod can do reciprocating linear motion in the motion constraint machine body. The motion restraint machine body is formed by limiting the motion track and the position of the reciprocating motion rod corresponding to the number of the rods, limiting the position of the rotating main shaft and installing other accessories with different functions, and can be an open structure in a frame form or a closed structure in a six-plunger or piston star 60-degree layout in a crankcase form. The crankshaft includes an input-output shaft, a crank, a crankshaft and a synchronizing shaft, the crankshaft being an integral part or assembly. The input-output shaft and the crank shaft are respectively provided with a crank, and the synchronizing shaft is arranged between the two cranks and is fixedly connected with the cranks. The motion restraint body is movably connected with the crank shaft and the input-output shaft, and the crank shaft can rotate in the motion restraint body. The eccentric cam shaft, reciprocating motion rod, motion restricting body and crankshaft constitute one complete conjugate motion mechanism.

The combination mode of the coaxial sinusoidal motion mechanism of the cam is as follows: the eccentric circular cam shaft is sleeved on the synchronizing shaft of the input-output shaft and is coaxial with the synchronizing shaft, and acting force is directly generated between the eccentric circular cam shaft and the crank; the crank and eccentric cam shaft, input-output shaft, crank, reciprocating motion pole make up the combined crankshaft cam shaft part, the eccentric cam shaft is connected with crank activity, for example through the bearing connection, the power transmission chain of the combined crankshaft cam shaft part is: input-output shaft → crank → eccentric circular camshaft → reciprocating rod or reverse. The aperture of the middle part of the 3 reciprocating motion rods is matched with the diameter of the 3 eccentric circular cams of the eccentric circular cam shaft, and the eccentric circular cams can rotate in the aperture of the middle part of the reciprocating motion rods. The motion restraint body is movably connected with the crank shaft and the input-output shaft, and the crank shaft can rotate in the motion restraint body. The eccentric cam shaft, the crank, the synchronous shaft and the reciprocating motion rod are combined and then matched with the motion constraint body to form a complete conjugate motion structure together with corresponding motion constraint and other functional accessories and components.

The mechanism of the invention can be made into different devices, such as: air compressors, water pumps, internal combustion engines, and the like require reciprocating and rotary interconversion of motion mechanisms and equipment.

The working mode of the mechanism of the invention is as follows: when the motion restraint engine body is designed into an engine body structure, two ends of a reciprocating motion rod are pistons, fuel explosion gas pressure acts on the pistons to push the pistons to move under the restraint of an air cylinder body, the stress of the reciprocating motion of the pistons is transmitted to an eccentric cam of an eccentric cam shaft, and the eccentric cam shaft sleeved on a synchronizing shaft does rotary motion under the common restraint of a hole in the middle of a piston rod and a crank shaft hole while reciprocating motion along with the pistons. The thrust of the eccentric circular camshaft from the piston acts on the crank to push the crankshaft to rotate and do work, the rotation direction of the crankshaft is opposite to that of the camshaft, and the movement direction is unique. When the structure is applied to equipment with similar working principles such as an air compressor and the like, the working mode of the eccentric circular cam shaft mechanism is reciprocal to that of the eccentric circular cam shaft mechanism, namely, the reciprocating motion of the piston is driven by the rotation of the crankshaft.

The motion relation of the mechanism of the invention is as follows:

because the crank radius R of the crankshaft and the eccentricity e of the eccentric circular cam exist at the same time, the stroke of the piston is 2 times of the crank radius and the eccentricity e of the eccentric circular cam, namely the stroke is (R + e) × 2, the eccentricity e of the eccentric circular cam in the mechanism is the crank radius R, so the stroke is 4R, because the eccentric circular cam shaft is a rigid part or component, 3 evenly distributed eccentric cams are matched with 3 groups of piston rods to move together at the same time, a piston rod motion dead point does not exist, because the piston rod only carries out reciprocating motion force transmission, the reciprocating motion is not changed into the function of rotary motion, the reciprocating motion conversion rotary motion is completed by the reciprocal rotation of the crankshaft and the eccentric circular cam shaft under the constraint of the reciprocating motion rod and the motion constraint body, the mechanism is fundamentally different from the crankshaft connecting rod mechanism, a complete positive mechanism is formed under the two eccentric reciprocal motions, the motion track is completely coincided with the sine curve.

Advantageous effects

The invention applies the eccentric cam shaft on the crank shaft and forms a crank cam shaft mechanism with the reciprocating motion rod, the acting force of the eccentric cam shaft directly acts on the crank or the acting force of the crank directly acts on the eccentric cam shaft, and the synchronizing shaft has no force transmission function. In the conjugate sine reciprocating rotary motion mechanism, the resultant force of the side pressure in the reciprocating rotary motion is zero, and the side pressure is not arranged at the two ends of the reciprocating motion rod, so that the mechanical efficiency is high. Through the cooperation of eccentric round camshaft and bent axle, make the compact structure of this mechanism, part quantity is few, small, light in weight practices thrift raw and other materials. The mechanism has reasonable motion, only has rotating centrifugal force, does not have high-order shake, is extremely easy to balance, has no vibration, has high mechanical efficiency and volumetric efficiency, has high energy consumption utilization rate, reduces emission and has good energy-saving effect. The inherent characteristics and reasonableness of the mechanism obviously reduce noise in the manufactured equipment and can obviously reduce noise pollution.

Drawings

FIG. 1 is an exploded view of the mechanism

FIG. 2 is a schematic diagram of the mechanism

FIG. 3 is a detailed structure view of an eccentric cam shaft

FIG. 4 is a detailed structure view of the reciprocating lever

FIG. 5 is a detailed structure diagram of the exercise restriction body

FIG. 6 is a detailed structure diagram of an input-output shaft

FIG. 7 is a detailed structural view of a crank shaft

Reference numerals: 1-crankshaft, 2-motion constraint body, 3-reciprocating motion rod, 4-eccentric circular camshaft, 5-input-output shaft, 6-synchronous shaft, 7, 11-crank, 8, 12-balance weight, 9-main shaft support, 10-crankshaft, 13-eccentric circular cam 1, 14-eccentric circular cam 2, 15-eccentric circular cam 3, 16-linear motion friction pair

Detailed Description

In this embodiment, the reciprocating rod is a piston rod, and as shown in fig. 1, the sinusoidal motion mechanism with coaxial cams includes: an eccentric circular camshaft 4, a reciprocating motion rod 3, a motion restraint body 2 and a crankshaft; the crankshaft includes an input-output shaft 5, cranks (7, 11), a crankshaft 1, and a synchronizing shaft 6. The eccentric circular camshaft 4 is sleeved on a synchronizing shaft 6 of the input-output shaft 5 and is coaxial with the synchronizing shaft 6, and the synchronizing shaft 6 is arranged between the two cranks and is fixedly connected with the cranks (7 and 11); the reciprocating rod 3 can make reciprocating linear motion in the motion-restricting body 2. The motion restraint body 2 is movably connected with the crank shaft 1 and the input-output shaft 5, and the crank shaft can rotate in the motion restraint body. The crank (7, 11), the eccentric circular camshaft 4 and the input-output shaft 5 form a combined crank-cam shaft part, the eccentric circular camshaft 4 is movably connected with the crank (7, 11) through a bearing, and a power transmission chain of the combined crank-cam shaft part is as follows: the reciprocating rod 3 → the eccentric camshaft 4 → the cranks (7, 11) → the input-output shaft 5 or reverse. The bore diameters of the 3 reciprocating motion rods are matched with the diameters of the 3 eccentric circular cams of the eccentric circular cam shaft 4, and the eccentric circular cams (13, 14 and 15) can rotate in the bore of the reciprocating motion rod. The eccentric circular camshaft 4, the cranks (7, 11), the synchronous shaft 6 and the reciprocating motion rod 3 are combined and then matched with the motion constraint machine body 2 to form a complete conjugate motion structure. The assembled mechanism is shown in fig. 2, and the working principle of the mechanism is as follows: the pressure of fuel explosion gas acts on the piston to push the piston to move under the constraint of the cylinder body, the stress of the reciprocating motion of the piston is transmitted to the eccentric circular cam of the eccentric circular cam shaft 4 through the piston rod, and the eccentric circular cam shaft 4 sleeved on the synchronizing shaft 6 does rotary motion under the common constraint of a hole in the middle of the piston rod and a crank hole while reciprocating along with the piston. The eccentric circular camshaft 4 transmits the thrust action of the piston to the crank to push the crankshaft to rotate to do work, the rotating direction of the crankshaft is opposite to that of the camshaft, and the moving direction is unique.

The concrete structure of each part is as follows: as shown in fig. 3, the eccentric circular cam shaft 4 is formed by 3 eccentric circular cams (eccentric circular cam 1, eccentric circular cam 2 and eccentric circular cam 3) which are uniformly distributed at 120 ° on a rotating shaft, the eccentricity of each eccentric circular cam is e, the inner diameter of the cam shaft is phid 2, the outer diameter of the cam shaft is phid 1, and the diameter of the eccentric circular cam is phid 2, and the cam shaft may be an independent part or a combined part. As shown in figure 4, each cam corresponds to a reciprocating rod, two ends of the rod are provided with linear motion friction pairs 16, specifically pistons, the middle part of the rod is provided with a hole matched with the diameter phi D2 of the eccentric circular cam (13, 14, 15), and the hole diameter is phi D1. As shown in fig. 5, the motion-restricting body 2 is a crankcase of a piston star 60 arrangement. The crankshaft includes an input-output shaft 5, cranks (7, 11), a crankshaft 1, and a synchronizing shaft 6, which are combined components. An eccentric circular camshaft 4, a reciprocating motion rod 3, a motion restraint machine body 2 and a crankshaft form a complete conjugate motion mechanism. As shown in fig. 6, the input/output shaft 5 includes a main shaft support 9, a balance weight 8, a crank 7 and a synchronizing shaft 6, the balance weight 8 has an eccentricity e, the crank 7 has a crank hole with a diameter of phid which is matched with the outer diameter phid 1 of the eccentric cam shaft 4, the synchronizing shaft 6 is concentrically arranged in the crank hole, and the synchronizing shaft 6 only has a synchronizing function and is not affected by the thrust of the eccentric cam shaft 4. As shown in FIG. 7, the crank shaft comprises a main shaft support 10, a crank 11, and a balance weight 12 having an eccentricity e, the crank 11 having a crank hole of diameter PhiD fitted to an outer diameter Phid 1 of the eccentric cam shaft 4. The eccentricity e of the eccentric circular cam in this embodiment is equal to the crank radius R, and the piston stroke is equal to 4R.

The mechanism realizes the conversion of reciprocating linear motion and rotary motion through the matching of the eccentric circular cam shaft 4 sleeved on the synchronizing shaft of the crankshaft and the reciprocating motion rod 3, no side pressure exists at the two ends of the reciprocating motion rod, and 3 uniformly distributed eccentric cams (13, 14 and 15) are matched with 3 groups of piston rods to move together at the same time, so that no piston rod motion dead points exist. The mechanism has reasonable motion, only has rotating centrifugal force, does not have high-order shake, is extremely easy to balance, has no vibration, has high mechanical efficiency and volumetric efficiency, has high energy consumption utilization rate, reduces emission and has good energy-saving effect.

The above embodiments are preferred embodiments of the present invention, and those skilled in the art can make variations and modifications to the above embodiments, therefore, the present invention is not limited to the above embodiments, and any obvious improvements, substitutions or modifications made by those skilled in the art based on the present invention are within the protection scope of the present invention.

Claims (6)

1. A sinusoidal motion mechanism with coaxial cams, comprising: eccentric circular camshaft, reciprocating motion pole, motion restraint organism, bent axle, its characterized in that: the crank shaft comprises an input-output shaft, cranks, a crank shaft and a synchronous shaft, the cranks are respectively arranged on the input-output shaft and the crank shaft, the synchronous shaft is arranged between the two cranks and is fixedly connected with the cranks, the eccentric circular cam shaft is formed by uniformly distributing 3 eccentric circular cams on a rotating shaft into 120 degrees, the eccentric circular cam shaft is sleeved on the synchronous shaft of the input-output shaft and is coaxial with the synchronous shaft and is movably connected with the cranks, and acting force is directly generated between the eccentric circular cam shaft and the cranks; the reciprocating motion rods correspond to the eccentric circular cams in the eccentric circular cam shaft one by one, the middle parts of the reciprocating motion rods are provided with holes matched with the eccentric circular cams, the hole diameters of the middle parts of the 3 reciprocating motion rods are matched with the diameters of the 3 eccentric circular cams of the eccentric circular cam shaft, the eccentric circular cams can do rotary motion in the holes in the middle parts of the reciprocating motion rods, and the reciprocating motion rods can do reciprocating linear motion in the motion constraint machine body; the motion restraint machine body is formed by limiting the motion track and the position of the reciprocating motion rods corresponding to the number of the reciprocating motion rods, limiting the position of a rotating main shaft and installing other accessories with different functions, and is movably connected with a crank shaft and an input-output shaft, and the crank shaft can rotate in the motion restraint machine body.

2. The mechanism of claim 1, wherein: the eccentric circular cam shaft is an independent part or a combined component.

3. The mechanism of claim 1, wherein: the reciprocating rod is a sliding block structure, a sliding plug structure or a component and a part which are combined with components required by different functions and purposes.

4. The mechanism of claim 1, wherein: the motion restraint body is an open structure in the form of a frame, and a six-plunger or piston star-shaped 60-degree layout closed structure in the form of a crankcase.

5. An apparatus employing a sinusoidal motion mechanism with coaxial cams, comprising a mechanism as claimed in any one of claims 1 to 4.

6. The apparatus of claim 5, wherein: the equipment is an air compressor, a water pump or an internal combustion engine.

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