CN212583821U - Cam tappet type engine - Google Patents

Abstract

The utility model discloses a cam tappet type engine, which comprises a cylinder sleeve fixedly installed in an engine body, a piston arranged in the cylinder sleeve in a sliding manner, and a piston rod with the upper end connected with the piston, wherein a guide block used for ensuring the vertical motion stability of the piston rod is positioned and installed below the cylinder sleeve in a cylinder body, a guide sliding hole matched with the sliding guide of the piston rod is processed in the center of the guide block, and the lower end of the piston rod passes through the guide sliding hole in a sliding manner and is hinged with a sliding block used for realizing power transmission; the slide block is slidably abutted with a camshaft for converting power output by the piston rod into torque output, and the camshaft is rotatably mounted below the engine body through a bearing cover. The utility model discloses output is high, vibration small in noise, no piston side thrust, is particularly suitable for requiring lower warship on the ship to use to the vibration.

Description

Cam tappet type engine

Technical Field

The utility model relates to the technical field of engines, in particular to a cam tappet type engine suitable for high, medium and low speed diesel engines, gasoline engines and gas engines.

Background

At present, the conventional engines are all crank-connecting rod type mechanisms, and the power transmission parts of the engines mainly comprise pistons, connecting rods and crankshafts. The piston bears the pressure generated by fuel combustion to push the connecting rod connected with the piston to do reciprocating motion, the force transmitted by the connecting rod acts on the crank of the crankshaft to generate torque to drive the crankshaft to rotate, thereby realizing the output of the torque through the rotation of the crankshaft and achieving the purpose of outputting power outwards. The main disadvantages of crank-link engines are: the crank pin rotates around the main journal, and the connecting rod is hinged with the piston. When the engine is running, the piston generates side thrust, so that large transverse impact is caused, and strong vibration is formed. The higher the engine speed, the stronger the vibration. This is the main reason why the engine cannot now rotate too high.

Disclosure of Invention

The utility model aims to solve the technical problem to the current situation of above-mentioned prior art, and provide a cam tappet formula engine of output height, vibration small in noise, no piston side thrust.

The utility model provides a technical scheme that above-mentioned technical problem adopted does:

the cam tappet type engine comprises a cylinder sleeve fixedly installed in an engine body, a piston arranged in the cylinder sleeve (2) in a sliding mode and a piston rod of which the upper end is connected with the piston, a guide block used for guaranteeing the vertical motion stability of the piston rod is fixedly installed below the cylinder sleeve in the engine body, a guide sliding hole matched with the piston rod in a sliding guide mode is machined in the center of the guide block, and the lower end of the piston rod penetrates through the guide sliding hole in a sliding mode and is hinged with a sliding block used for achieving power transmission; the slide block is slidably abutted with a camshaft for converting power output by the piston rod into torque output, and the camshaft is rotatably mounted below the engine body through a bearing cover.

In order to optimize the technical scheme, the specific measures adopted further comprise:

the cam shaft consists of a circular cam with the peripheral surface matched with the sliding block in a sliding jacking way and an eccentric straight cam shaft integrally penetrating through the circular cam; two ends of the straight camshaft are sleeved with main bearings for rotatably supporting the camshaft, and the main bearings are positioned and supported on the bearing covers; concave areas for reducing the overall weight of the camshaft are symmetrically machined on the two side faces of the circular cam.

The upper part of the sliding block is provided with a double arm which is conveniently hinged with the piston rod, and the bottom surface of the sliding block is provided with an arc top joint surface which is matched with the radian of the peripheral surface of the circular cam; a first shaft hole is formed in each of the two arms, a second shaft hole is formed in the lower end of the piston rod, and the piston rod and the sliding block penetrate through the first shaft hole and the second shaft hole through the rotating shafts to rotate to be hinged.

A cylindrical cylinder barrel for positioning and installing the cylinder sleeve is formed in the machine body, a supporting boss for supporting the guide block is formed at the bottom end of the cylinder barrel, the guide block is positioned and installed on the supporting boss in a rotation-preventing manner, and the bottom end of the cylinder sleeve is matched with the top surface positioning support of the guide block; and a wear-resistant guide sleeve is sleeved in the guide sliding hole.

The straight shaft of the cam is tightly matched with the eccentric fixed sleeve and is provided with a positioning plate component for preventing the sliding block from being separated from the circular cam under the inertia effect; the positioning plate assembly comprises two circular positioning plates which are symmetrically arranged on two side surfaces of the circular cam; an eccentric hole used for being sleeved with a cam straight shaft is processed on the circular positioning plate, a circular positioning chute used for limiting the sliding track of the sliding block is processed on the plate surface of one side of the circular positioning plate facing the circular cam, positioning convex shoulders used for being clamped in the positioning chute are formed on two sides of the bottom of the sliding block (5), and the positioning convex shoulders rotate in the positioning chute along the positioning chute in a guiding mode.

An oil supply channel for supplying lubricating oil is axially processed in the straight cam shaft in a penetrating manner, a radial oil duct which is radially communicated with the oil supply channel is formed in the straight cam shaft at the installation position of the circular positioning plate, an oil storage ring is formed in the eccentric hole of the circular positioning plate at the position corresponding to the radial oil duct, and an internal oil duct which is used for communicating the positioning chute with the oil storage ring is processed in the circular positioning plate.

Six valve holes for communicating the internal oil duct with the positioning sliding groove are formed in the positioning sliding groove at a medium radian, and a valve bank for controlling on-off between the positioning sliding groove and the internal oil duct is installed in each valve hole; the valve group comprises a sealing ball for sealing the orifice of the valve hole, a pressure regulating spring for elastically jacking the sealing ball and a pressure regulating screw for spirally regulating the pre-tightening pressure of the pressure regulating spring; the sealing ball elastically compresses the pressure regulating spring to open the hole of the valve hole under the extrusion of the positioning shoulder of the sliding block.

An arc-shaped oil inlet groove is formed in the side face of the positioning convex shoulder of the sliding block, a lubricating oil passage is formed in the piston rod in an axially through mode, and a communicating oil passage for communicating the oil inlet groove with the lubricating oil passage is formed in the sliding block; the second shaft hole vertically penetrates through the lubricating oil channel, and the rotating shaft is provided with a radial oil hole for guiding the lubricating oil in the lubricating oil channel to the joint surface of the hinge.

The piston is fixedly arranged at the upper end of the piston rod, a vibration cooling oil cavity is formed in the piston, and a lubricating oil channel of the piston rod is communicated with the vibration cooling oil cavity of the piston.

Each round positioning plate is fixedly provided with a balance block for balancing weight, and a round concave area for reducing the total weight of the round positioning plate is designed on the round positioning plate; the plurality of camshafts are connected in sequence through the main bearing to form a camshaft assembly of the multi-cylinder engine for torque output.

Compared with the prior art, the utility model discloses install the guide block in the organism, the center processing of guide block has the direction slide opening, and the piston rod passes the direction slide opening with sliding, guarantees the stationarity that the piston rod reciprocated through the direction of guide block, prevents that the piston rod from swinging on the horizontal direction to guarantee that the piston can not produce the side thrust. The utility model discloses a camshaft is transmitted through the slider to the action that the piston rod produced, realizes the output of moment of torsion by the camshaft, and the piston rod adopts the dress of joining in marriage mutually of hinge mode with the slider, and the slider then adopts in close sliding contact's mode butt joint to cooperate with the camshaft. Because the utility model discloses do not have piston side thrust, the vibration that the engine produced is very little, can improve engine speed, and then improves engine power. The utility model discloses do not have the bent axle that conventional engine used, the output of power is directly accomplished by the straight axle of cam of camshaft, because the utility model discloses the straight axle of cam is a straight axle, does not have crank structure's arm apart from poor, consequently can not produce fatigue fracture trouble.

The utility model discloses output is high, vibration small in noise, no piston side thrust, is particularly suitable for requiring lower warship on the ship to use to the vibration.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is a sectional view in the direction A-A of FIG. 1;

FIG. 3 is a sectional view in the direction B-B of FIG. 2;

FIG. 4 is a schematic structural view of the camshaft of the present invention;

FIG. 5 is a right side view of FIG. 4;

FIG. 6 is a sectional structural view taken in the direction of C-C in FIG. 5;

fig. 7 is a schematic structural view of the circular positioning plate of the present invention;

FIG. 8 is a cross-sectional structural view taken in the direction D-D in FIG. 7;

fig. 9 is a schematic structural diagram of the sliding block of the present invention;

FIG. 10 is a right side view of FIG. 9;

FIG. 11 is a sectional structural view taken in the direction E-E in FIG. 10;

fig. 12 is a schematic view of an assembly structure of the slider, the piston rod and the camshaft according to the present invention;

FIG. 13 is a sectional view of the slider and the camshaft of the present invention;

FIG. 14 is a sectional view of the slider of the present invention assembled at another angle to the camshaft;

FIG. 15 is a schematic structural view of a camshaft assembly of a six cylinder engine constructed from the camshaft assembly of the present invention;

fig. 16 is a sectional structural view in the direction F-F in fig. 15.

Detailed Description

Embodiments of the present invention are described in further detail below with reference to the accompanying drawings.

Fig. 1 to 16 are schematic structural views of the present invention.

Wherein the reference numerals are: the hydraulic oil cylinder comprises a sealing ball F1, a pressure regulating spring F2, a pressure regulating screw F3, a guide block K, a balance block P, a guide sleeve T, a rotating shaft Z, a radial oil hole Z1, a machine body 1, a cylinder barrel 1a, a supporting boss 1b, a cylinder sleeve 2, a piston 3, an oscillating cooling oil cavity 3a, a piston rod 4, a lubricating oil channel 4a, a sliding block 5, a communicating oil channel 5b, a double arm 51, a first shaft hole 51a, a positioning shoulder 52, an oil inlet groove 52a, a camshaft 6, a circular cam 61, a straight cam shaft 62, an oil supply channel 62a, a radial oil channel 62b, a concave area 63, a main bearing 7, a bearing cover 8, a positioning plate assembly 9, a circular positioning plate 91, an eccentric hole 91a, a positioning chute 91b, an oil storage ring 91.

In the prior art, a piston of a conventional engine is hinged with a connecting rod, and the connecting rod is hinged with a crankshaft neck of a crankshaft, so that the piston of the engine with the structure can generate side thrust in the process of pushing the connecting rod to move downwards, and the piston has larger transverse impact force on a cylinder sleeve, so that strong vibration is easily caused, and the higher the rotating speed of the engine is, the stronger the vibration is.

The utility model provides a cam tappet formula engine, this kind of engine are owing to do not have piston side thrust, consequently can improve the rotational speed of engine effectively to small in noise, power take off are high. The average speed of the piston of the traditional engine is generally less than or equal to 10m/s, while the average speed of the piston of the engine of the utility model can reach 15m/s and even higher.

The utility model discloses an engine includes cylinder liner 2 and the piston rod 4 that the slip setting in piston 3 and the upper end that this cylinder liner 2 in the engine organism 1 is connected with piston 3 of fixed mounting. A cylindrical cylinder barrel 1a for positioning and installing the cylinder sleeve 2 is formed in the engine body 1, and when the cylinder barrel 1a is formed in the engine body 1, a single-cylinder engine can be formed. When four cylinder bores 1a are formed in the machine body 1 in a line, a four-cylinder engine can be constructed, and correspondingly, when six cylinder bores 1a are formed in the machine body 1, a six-cylinder engine can be constructed. As shown in fig. 2 and 3, the utility model discloses bottom shaping at cylinder 1a has a support boss 1b, should support boss 1b and go up to prevent rotating the ground location and install guide block K, guide block K is used for guaranteeing piston rod 4 vertical motion the stability of up-and-down motion promptly, makes piston rod 4 can not the horizontal hunting at the in-process of motion. The center of the guide block K is provided with a guide sliding hole which is used for being matched with the piston rod 4 in a sliding guide mode, and the lower end of the piston rod 4 penetrates through the guide sliding hole in a sliding mode. In order to improve the wearability of direction slide opening, guarantee the life of product, the utility model discloses wear-resisting uide bushing T is equipped with to the cover in the direction slide opening, uide bushing T and piston rod 4's outer peripheral face sliding fit. The guide block K is arranged below the cylinder sleeve 2, and the bottom end of the cylinder sleeve 2 is matched with the top surface of the guide block K in a positioning and supporting mode. The utility model discloses the method that the lower extreme of piston rod 4 adopted the hinge is connected with slider 5 that is used for realizing power transmission, and slider 5 is used for transferring the thrust that piston rod 4 downstream was applyed to next stage. The utility model discloses install camshaft 6 through bearing cap 8 with rotating in engine organism 1's bottom, bearing cap 8 can pass through the bolt fastening in organism 1's bottom to with camshaft 6 rotate ground pressure equipment on organism 1. As shown in fig. 2 and 3, the slider 5 abuts against the camshaft 6 in a sliding contact manner, so that the camshaft 6 is pushed to rotate, and the power output by the piston rod 4 is converted into torque output by the camshaft 6.

With the connecting rod horizontal hunting of conventional engine different completely, because the utility model discloses a piston rod 4 can only reciprocate to can guarantee that piston 3 can not produce the side thrust when reciprocating, make piston 3 can not produce horizontal impact force to the cylinder liner, consequently can improve the rotational speed of engine effectively, reduce the noise of engine during operation, guarantee that the engine has higher power output.

In the embodiment shown in fig. 4-6, the cam shaft 6 of the present invention is composed of a circular cam 61 and a straight cam shaft 62; the straight cam shaft 62 is eccentrically and fixedly arranged on the circular cam 61 in a penetrating way. The eccentricity is that the center axis of the straight cam shaft 62 and the center axis of the circular cam 61 are not aligned, and the entire camshaft 6 rotates about the center axis of the straight cam shaft 62. The slider 5 slidably abuts against the outer peripheral surface of the circular cam 61, and generates a moment for rotating the camshaft 6. The utility model discloses a camshaft 6 can be the shaping has a whole piece of circular cam 61 and cam straight axle 62, also can be two parts constitution of tight fit installation. The two ends of the straight cam shaft 62 are tightly matched and sleeved with the main bearing 7 for rotatably supporting the cam shaft 6, the bearing cover 8 is formed with a bearing clamping groove for clamping and positioning the main bearing 7, and the main bearing 7 is positioned and supported in the bearing clamping groove of the bearing cover 8. In order to reduce the total weight of the camshaft 6, the two side surfaces of the circular cam 61 of the present invention are symmetrically processed with recessed areas 63.

The utility model discloses an engine does not have the bent axle that conventional engine used, and the output of power is direct to be accomplished by camshaft 6. In a multi-cylinder engine, a plurality of camshafts 6 are connected in series through main bearings 7 and straight camshaft 62 to constitute a camshaft assembly for torque output of the multi-cylinder engine. The utility model discloses what fig. 15 and fig. 16 show is exactly that the six camshaft 6 of the utility model assemble the six jar camshaft assemblies that constitute. The camshaft assembly using the camshaft 6 does not have the problem of the conventional crank throw difference because the output shaft for performing power output is a straight shaft formed by the straight camshaft 62, so that the camshaft 6 does not have fatigue fracture failure and the torque output is larger.

In the embodiment shown in fig. 9 to 11, the upper portion of the sliding block 5 of the present invention is formed with a double arm 51 for facilitating the articulated connection with the piston rod 4, and the bottom surface of the sliding block 5 is an arc-shaped abutting surface adapted to the radian of the outer peripheral surface of the circular cam 61. As best seen in fig. 11, double arm 51 has a first shaft hole 51a formed therein. As shown in fig. 13, the lower end of the piston rod 4 is inserted between the two arms 51 of the slider 5, the lower end of the piston rod 4 is formed with a second axial hole, and the piston rod 4 and the slider 5 are rotatably hinged to each other by a rotating shaft Z passing through the first axial hole 51a and the second axial hole.

In order to prevent slider 5 and piston 3, piston rod 4 when upward movement, because inertial effect slider 5 breaks away from out circular cam 61, as shown in fig. 3, the utility model discloses a fixed cover of eccentric formula is equipped with locating plate subassembly 9 on the straight axle 62 of cam. The positioning plate assembly 9 is composed of two circular positioning plates 91, and the two circular positioning plates 91 are symmetrically arranged on two side surfaces of the circular cam 61. The circular positioning plate 91 is provided with an eccentric hole 91a for being fitted with the straight cam shaft 62. The center axis of the eccentric hole 91a is not aligned with the center axis of the circular positioning plate 91. The circular positioning plate 91 is provided with a circular positioning sliding groove 91b for limiting the sliding track of the sliding block 5 on the plate surface facing the circular cam 61, two sides of the bottom of the sliding block 5 are formed with positioning shoulders 52 for being clamped in the positioning sliding groove 91b, and the positioning shoulders 52 rotate in the positioning sliding groove 91b along the positioning sliding groove 91b in a guiding manner. The utility model discloses when slider 5 and circular cam 61 relative motion, can be along circular cam 61's cylindrical motion always in order to guarantee slider 5, circular locating plate 91 has been installed at circular cam 61's both sides face, circular locating plate 91 is connected with the interference of cam straight axle 62, the ring shape location spout 91b of circular locating plate 91 cooperates with slider 5's location convex shoulder 52, slider 5's location convex shoulder 52 is at ring shape location spout 91b internal rotation, like this owing to had location spout 91b, thereby it can hug closely circular cam 61's outer periphery all the time to have injectd slider 5.

In order to lubricate all the moving parts and reduce the friction loss, in the embodiment, as shown in fig. 6 and 13, an oil supply channel 62a for supplying lubricating oil is axially and penetratingly processed in the straight cam shaft 62, and a radial oil passage 62b radially communicating with the oil supply channel 62a is formed on the straight cam shaft 62 at the mounting position of the circular positioning plate 91. As shown in fig. 8, an oil accumulation ring 91c is formed in the eccentric hole 91a of the circular positioning plate 91 at a position corresponding to the radial oil passage 62b, so that the lubricating oil that has entered from the radial oil passage 62b can enter the oil accumulation ring 91 c. In order to reduce the friction between the positioning shoulder 52 and the positioning slide groove 91b, an internal oil passage is formed in the circular positioning plate 91 to communicate the positioning slide groove 91b and the oil accumulation ring 91 c.

As can also be seen from fig. 7 and 8, six valve holes communicating the internal oil passage with the positioning sliding groove 91b are formed in the positioning sliding groove 91b at a medium radian, and a valve group for controlling on-off between the positioning sliding groove 91b and the internal oil passage is installed in each valve hole. The valve group comprises a sealing ball F1 for sealing the orifice of the valve hole, a pressure regulating spring F2 for elastically pressing the sealing ball F1 and a pressure regulating screw F3 for spirally regulating the pre-tightening pressure of the pressure regulating spring F2. The sealing ball F1 elastically compresses the pressure-regulating spring F2 to open the orifice of the valve hole under the pressing of the positioning shoulder 52 of the slider 5. The utility model discloses install the valves in the valve opening, can utilize the valves to prevent that lubricating oil from revealing. It can be seen from fig. 8 that when the sealing ball F1 is in the free state, the portion of the sealing ball F1 protrudes out of the orifice of the valve bore. When the camshaft 6 and the circular positioning plate 91 rotate and the circular positioning plate 91 contacts the sliding block 5, the side surface of the positioning convex shoulder 52 of the sliding block 5 presses the sealing ball F1 open to be separated from the orifice of the valve hole, and then the lubricating oil can enter the positioning sliding groove 91b through the valve hole.

In the embodiment, as shown in fig. 10, 11 and 14, an arc-shaped oil inlet groove 52a is formed on a side surface of the positioning shoulder 52 of the slider 5, a lubricating oil passage 4a is axially and penetratingly formed in the piston rod 4, and a communication oil passage 5b for communicating the oil inlet groove 52a with the lubricating oil passage 4a is formed in the slider 5; the second shaft hole vertically passes through the lubricating oil passage 4a, and the rotating shaft Z is provided with a radial oil hole Z1 for guiding the lubricating oil in the lubricating oil passage 4a to the joint surface of the hinge. An oil inlet groove 52a is formed in the side surface of the positioning shoulder 52, and the lubricating oil entering the positioning sliding groove 91b can enter the lubricating oil passage 4a of the piston rod 4 through the oil inlet groove 52a and the communication oil passage 5b, and lubricate the hinge surface of the rotating shaft Z through the radial oil hole Z1 on the rotating shaft Z.

In the embodiment, as shown in fig. 2 and 13, the piston 3 is fixedly mounted on the upper end of the piston rod 4, the oscillating cooling oil chamber 3a is formed in the piston 3, and the lubricating oil passage 4a of the piston rod 4 is communicated with the oscillating cooling oil chamber 3a of the piston 3. Lubricating oil can enter the oscillation cooling oil cavity 3a through the lubricating oil channel 4a to cool the piston top.

In the embodiment, a weight P for balancing is fixedly mounted on each circular positioning plate 91, and a circular concave area 91d for reducing the total weight of the circular positioning plate 91 is designed on the circular positioning plate 91.

The utility model has the advantages that:

1. the utility model discloses because there is not piston side thrust, the vibration that the engine produced is very little, can improve engine speed, and then improves engine power. The engine with the structure is most suitable for ships with lower requirements on vibration, such as submarines, yachts, cruise ships and other ships.

2. The utility model discloses because there is not the bent axle that conventional engine used, power output shaft is the straight axle that the cam straight axle that is connected by each shelves of base bearing interference formed, and circular cam and circular locating plate all adopt the interference mode to fix on the cam straight axle, and power output shaft compares the bent axle, no matter be manufacturing cost or manufacturing cycle and manufacture equipment, all have great advantage than bent axle production.

3. The utility model discloses a power take-off device safe and reliable because power output shaft is the straight axle, does not have the arm apart from poor, can not produce fatigue fracture trouble.

4. Because the rotating speed of the engine can be greatly improved, the output power can be improved by more than 50 percent compared with a general engine, and the ton power is greatly improved.

While the preferred embodiments of the present invention have been illustrated, various changes and modifications may be made by those skilled in the art without departing from the scope of the present invention.

Claims (10)

1. Cam tappet formula engine, including cylinder liner (2) and the piston rod (4) that the slip setting in piston (3) and upper end that this cylinder liner (2) in engine organism (1) is connected, characterized by: a guide block (K) used for ensuring the vertical motion stability of the piston rod (4) is positioned and installed below the cylinder sleeve (2) in the machine body (1), a guide sliding hole matched with the piston rod (4) in a sliding guide mode is machined in the center of the guide block (K), and the lower end of the piston rod (4) penetrates through the guide sliding hole in a sliding mode and is hinged to a sliding block (5) used for achieving power transmission; the sliding block (5) is in sliding connection with a camshaft (6) which is used for converting power output by the piston rod (4) into torque output, and the camshaft (6) is rotatably arranged below the engine body (1) through a bearing cover (8).

2. The cam tappet type engine according to claim 1, wherein: the camshaft (6) consists of a circular cam (61) with the peripheral surface matched with the sliding block (5) in a sliding abutting mode and a cam straight shaft (62) which integrally penetrates through the circular cam (61) in an eccentric mode; two ends of the straight camshaft (62) are sleeved with main bearings (7) for rotatably supporting the camshaft (6), and the main bearings (7) are positioned and supported on the bearing covers (8); concave areas (63) for reducing the total weight of the camshaft (6) are symmetrically machined on two side surfaces of the circular cam (61).

3. The cam tappet type engine according to claim 2, wherein: the upper part of the sliding block (5) is formed with a double arm (51) which is conveniently hinged with the piston rod (4), and the bottom surface of the sliding block (5) is an arc-shaped top contact surface which is matched with the radian of the peripheral surface of the circular cam (61); a first shaft hole (51a) is formed in the double arm (51), a second shaft hole is formed in the lower end of the piston rod (4), and the piston rod (4) and the sliding block (5) penetrate through the first shaft hole (51a) and the second shaft hole through a rotating shaft (Z) to rotate and hinge.

4. The cam tappet type engine according to claim 3, wherein: a cylindrical cylinder barrel (1a) used for positioning and installing a cylinder sleeve (2) is formed in the machine body (1), a supporting boss (1b) used for supporting a guide block (K) is formed at the bottom end of the cylinder barrel (1a), the guide block (K) is positioned and installed on the supporting boss (1b) in a rotation-proof manner, and the bottom end of the cylinder sleeve (2) is matched with the top surface of the guide block (K) in a positioning and supporting manner; and a wear-resistant guide sleeve (T) is sleeved in the guide sliding hole.

5. The cam tappet type engine according to claim 4, wherein: the cam straight shaft (62) is tightly matched with an eccentric fixed sleeve to be provided with a positioning plate component (9) for preventing the sliding block (5) from being separated from the circular cam (61) under the inertia effect; the positioning plate assembly (9) comprises two circular positioning plates (91) which are symmetrically arranged on two side surfaces of the circular cam (61); the circular positioning plate (91) is provided with an eccentric hole (91a) used for being sleeved with the straight cam shaft (62), the plate surface of the circular positioning plate (91) facing one side of the circular cam (61) is provided with a circular positioning chute (91b) used for limiting the sliding track of the sliding block (5), two sides of the bottom of the sliding block (5) are formed with positioning shoulders (52) used for being clamped into the positioning chute (91b), and the positioning shoulders (52) are guided and rotated along the positioning chute (91b) in the positioning chute (91 b).

6. The cam tappet type engine according to claim 5, wherein: an oil supply channel (62a) for supplying lubricating oil is axially processed in the straight cam shaft (62) in a penetrating manner, a radial oil channel (62b) which is radially communicated with the oil supply channel (62a) is formed at the mounting position of the circular positioning plate (91) on the straight cam shaft (62), an oil storage ring (91c) is formed in the eccentric hole (91a) of the circular positioning plate (91) at the position corresponding to the radial oil channel (62b), and an internal oil channel which is used for communicating the positioning chute (91b) and the oil storage ring (91c) is processed in the circular positioning plate (91).

7. The cam tappet type engine according to claim 6, wherein: six valve holes communicated with the internal oil passage and the positioning sliding groove (91b) are formed in the positioning sliding groove (91b) at medium radian, and a valve bank for controlling on-off between the positioning sliding groove (91b) and the internal oil passage is mounted in each valve hole; the valve group comprises a sealing ball (F1) for sealing the orifice of the valve hole, a pressure regulating spring (F2) for elastically pressing the sealing ball (F1) and a pressure regulating screw (F3) for spirally regulating the pre-tightening pressure of the pressure regulating spring (F2); the sealing ball (F1) elastically compresses the pressure regulating spring (F2) to open the orifice of the valve hole under the extrusion of the positioning shoulder (52) of the sliding block (5).

8. The cam tappet type engine according to claim 7, wherein: an arc-shaped oil inlet groove (52a) is machined in the side face of the positioning convex shoulder (52) of the sliding block (5), a lubricating oil channel (4a) is axially and penetratingly machined in the piston rod (4), and a communicating oil channel (5b) for communicating the oil inlet groove (52a) with the lubricating oil channel (4a) is machined in the sliding block (5); the second shaft hole vertically penetrates through the lubricating oil channel (4a), and a radial oil hole (Z1) for guiding lubricating oil in the lubricating oil channel (4a) to a joint surface of the hinge is formed in the rotating shaft (Z).

9. The cam tappet type engine according to claim 8, wherein: the piston (3) is fixedly arranged at the upper end of the piston rod (4), a vibration cooling oil cavity (3a) is formed in the piston (3), and a lubricating oil channel (4a) of the piston rod (4) is communicated with the vibration cooling oil cavity (3a) of the piston (3).

10. The cam tappet type engine according to claim 9, wherein: each circular positioning plate (91) is fixedly provided with a balance block (P) for balancing weight, and a circular concave area (91d) for reducing the total weight of the circular positioning plate (91) is designed on the circular positioning plate (91); the camshafts (6) are connected in sequence through the main bearings (7) to form a camshaft assembly for torque output of the multi-cylinder engine.

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