CN217029618U - Split type bent axle and air compressor machine - Google Patents

Abstract

The utility model discloses a split type crankshaft and an air compressor, comprising: the first shaft body and the second shaft body form a crankshaft shape through the fixing part. In the rotating process of the split crankshaft, the connecting part of the first main journal and the second main journal does not need to be connected with a connecting rod, namely the connecting part of the first main journal and the second main journal does not need to bear the torque applied by the connecting rod; therefore, compare in prior art, this scheme has avoided split type bent axle can dismantle the moment of torsion that the junction connecting rod was applyed, promptly, split type bent axle can dismantle the junction compare in prior art split type bent axle can dismantle the junction in this scheme, the effect moment quantity that receives still less, consequently, under the equal same condition of external effect condition and service environment, split type bent axle can dismantle the junction in this scheme more reliable.

Description

Split type bent axle and air compressor machine

Technical Field

The utility model relates to the technical field of air compressor accessories, in particular to a split type crankshaft and an air compressor.

Background

The crank shaft is one of the most important parts in the air compressor, external power of the motor and the like is transmitted to the air compressor through the crank shaft, so that the crank shaft drives the connecting rod arranged on the crank shaft to convert rotary motion into reciprocating motion, and the work of the piston type air compressor is realized.

In order to facilitate installation and disassembly, split crankshafts are generally adopted in air compressors in the prior art. For example, patent document CN 212508705U proposes a split type crankshaft transmission mechanism of an oilless air compressor, an oilless air compressor and an automobile.

Among the prior art, split type bent axle includes: a bearing end half crankshaft and a gear end half crankshaft,

the bearing end half-crankshaft comprises a first main journal and a 'first half-crank journal',

the gear-end half-crankshaft comprises a second main journal and a 'second half-crank journal',

the 'first half crank journal' and the 'second half crank journal' are detachably connected such that the bearing-end half crankshaft and the gear-end half crankshaft constitute a split crankshaft; the first half crank journal and the second half crank journal form a crank journal, a maintenance-free bearing is sleeved outside the crank journal, and a connecting rod is arranged outside the maintenance-free bearing and connected to the piston;

when the crank shaft is used, the motor spindle drives the second main journal to rotate, and the second main journal transmits torque to the crank journal, so that the crank journal drives the connecting rod to move through the maintenance-free bearing; therefore, under the condition of rotation of the split-type crankshaft, the joint of the 'first half crank journal' and the 'second half crank journal' is subjected to both the torque applied by the maintenance-free bearing and the torque applied by the connecting rod and the torque generated by the 'second half crank journal' driving the 'first half crank journal' to rotate, and the joint of the 'first half crank journal' and the 'second half crank journal' is prone to fatigue, severe even fracture and failure of the crankshaft under the long-term action of the three torques.

In summary, the technical problems in the prior art are as follows: the detachable connection of the split-type crankshaft at the crank journal is not reliable.

SUMMERY OF THE UTILITY MODEL

The utility model provides a split type crankshaft and an air compressor, aiming at the problem that in the prior art, the detachable connection formed at a crank journal of the split type crankshaft is unreliable.

A split crankshaft, comprising: the first shaft body and the second shaft body are identical in structure; the fixing part is provided with two openings, the hole center lines of the two openings are coaxial, the radial cross sections of the two openings are circular, and the directions of the two openings are opposite;

the first shaft body comprises a first main journal, the second shaft body comprises a second main journal, and the first main journal and the second main journal are in interference connection with the inner wall of one of the openings respectively;

the first shaft body and the second shaft body form a crankshaft shape through the fixing part.

Furthermore, the device also comprises a positioning structure, and the first main journal and the second main journal form circumferential positioning through the positioning structure.

Furthermore, a first positioning through hole and a first guide through hole are formed in the first main journal, and a second positioning through hole and a second guide through hole are formed in the second main journal, wherein the axis of the first positioning through hole is coaxial with the axis of the second guide through hole, and the axis of the second positioning through hole is coaxial with the axis of the first guide through hole;

the positioning structure comprises a first pin sleeve and a second pin sleeve;

one end of the first pin bush is inserted into the first positioning through hole and is in interference connection with the inner wall of the first positioning through hole, and the other end of the first pin bush is inserted into the second guiding through hole and is in clearance connection with the inner wall of the second guiding through hole;

one end of the second pin bush is inserted into the second positioning through hole and is in interference connection with the inner wall of the second positioning through hole, and the other end of the second pin bush is inserted into the first guiding through hole and is in clearance connection with the inner wall of the first guiding through hole.

Furthermore, a first step is arranged in the first positioning through hole, and one end, inserted into the first positioning through hole, of the first pin sleeve is abutted to the first step;

a second step is arranged in the second positioning through hole, and one end of the second pin bush inserted into the second positioning through hole is abutted to the second step.

Further, the first shaft body further comprises a first counterweight part and a first crank journal, and the first counterweight part is detachably connected with the first crank journal;

the second shaft body further comprises a second counterweight part and a second crank journal, and the second counterweight part is detachably connected with the second crank journal.

Furthermore, one end of the first counterweight part penetrates through the first crank journal and is detachably connected with the second pin sleeve through a first screw; the other end of the first counterweight part extends along the direction from the first guide through hole to the first positioning through hole; the first counterweight does not interfere with the circumferential outer surface of the first crank journal;

one end of the second counterweight part penetrates through the second crank shaft neck and is detachably connected with the first pin sleeve through a second screw; the other end of the second counterweight part extends along the direction from the second guide through hole to the second positioning through hole; the second counterweight does not interfere with the circumferential outer surface of the second crank journal.

Furthermore, the first counterweight part is arranged on the circumferential outer surface of the first main journal, the first counterweight part comprises a first small-diameter area and a first large-diameter area, the first small-diameter area is positioned between the first large-diameter area and the first crank journal, and the first large-diameter area and the first crank journal are respectively positioned on two sides of the axis of the first main journal;

the second counterweight part is arranged on the circumferential outer surface of the second main journal and comprises a second small-diameter area and a second large-diameter area, the second small-diameter area is located between the second large-diameter area and the second crank journal, and the second large-diameter area and the second crank journal are located on two sides of the axis of the second main journal respectively.

Furthermore, the end face of one side, away from the first crank journal, of the first main journal is a first mounting surface, the first main journal is provided with a first weight reduction area and a first non-weight reduction area, the first weight reduction area is recessed towards the interior of the first main journal along the first mounting surface, a first preset distance is arranged between the contour of the first weight reduction area and the axis of the first crank journal, and the contour of the first non-weight reduction area and the axis of the first crank journal are isolated by the contour of the first weight reduction area;

the end face of one side, away from the second crank journal, of the second main journal is a second mounting surface, the second main journal is provided with a second weight reduction area and a second non-weight reduction area, the second weight reduction area is sunken towards the interior of the second main journal along the second mounting surface, a second preset distance is arranged between the outline of the second weight reduction area and the axis of the second crank journal, and the outline of the second non-weight reduction area and the axis of the second crank journal are separated by the outline of the second weight reduction area.

Still provide an air compressor machine, including foretell split type bent axle.

Furthermore, the fixed part is a support bearing, and the split type crankshaft is fixed on the inner wall of the machine case of the air compressor through the support bearing.

Compared with the prior art, the utility model has the advantages that:

in the scheme, the first shaft body and the second shaft body have the same structure, the first shaft body is equivalent to a bearing end half crankshaft in the prior art, the second shaft body is equivalent to a gear end half crankshaft in the prior art, and the scheme adopts the technical scheme that the first main journal and the second main journal are detachably connected to form the split type crankshaft, so that the technical scheme that the 'first half crank journal' and the 'second half crank journal' are detachably connected to form the split type crankshaft in the prior art is replaced; in the rotating process of the split type crankshaft, the connecting part of the first main journal and the second main journal needs to bear the torque applied by the fixing part and the torque of the second main journal driving the first main journal to rotate; therefore, in this scheme, compare in prior art's technical scheme, the moment of torsion that the connecting rod was applyed has been avoided in the junction of first main journal and second main journal, promptly, the detachable junction of split type bent axle compares in prior art detachable junction of split type bent axle in this scheme, and the effect moment quantity that receives still less, and consequently, the detachable junction of split type bent axle is more reliable in this scheme.

Drawings

FIG. 1 is a schematic structural view of a split type crankshaft in embodiment 1;

FIG. 2 is an exploded view of the split type crankshaft of embodiment 1;

FIG. 3 is a schematic view of the structure of the weight of embodiment 1;

FIG. 4 is a schematic view of a split type crankshaft structure of embodiment 2;

FIG. 5 is a schematic structural view of a split type crankshaft in embodiment 3;

fig. 6 is a schematic structural view of an air compressor according to embodiment 4;

reference numbers: the hinge joint comprises a first shaft body (1), a second shaft body (2), a fixing part (3), an opening (301), a first main journal (4), a second main journal (5), a first crank journal (7), a second crank journal (8), a first positioning through hole (9), a first guide through hole (10), a second positioning through hole (11), a second guide through hole (12), a first pin bush (13), a second pin bush (14), a first step (15), a second step (16), first counterweight parts (17a, 17b), second counterweight parts (18a, 18b), a first small-diameter area (17b-1), a first large-diameter area (17b-2), a second small-diameter area (18b-1), a second large-diameter area (18b-2), a coupling driving end (21), a coupling driven end (22), a power mechanism (23), a first mounting surface (24), The material discharging device comprises a first weight-reducing area (25), a first non-weight-reducing area (26), a second mounting surface (27), a second weight-reducing area (28), a second non-weight-reducing area (29), a first protrusion (30), a second protrusion (31), a first screw (32), a second screw (33), a first weight-reducing part (36), a second weight-reducing part (37), a first discharging hole (38) and a second discharging hole (39).

Detailed Description

The following detailed description is given to the embodiments of the present invention with reference to the accompanying drawings. In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless explicitly specified otherwise. The embodiments described below with reference to the accompanying drawings are illustrative and intended to explain the present invention and should not be construed as limiting the present invention.

Example 1

As shown in fig. 1 to 2, a split type crankshaft according to a preferred embodiment of the present invention includes: the structure of the first shaft body 1 is the same as that of the second shaft body 2; the fixing part 3 is provided with two openings 301, the hole center lines of the two openings 301 are arranged coaxially, the radial sections of the two openings 301 are circular, and the opening directions of the two openings 301 are opposite; the first shaft body 1 comprises a first main journal 4, the second shaft body 2 comprises a second main journal 5, and the first main journal 4 and the second main journal 5 are respectively in interference connection with the inner wall of one of the openings 301; the first shaft body 1 and the second shaft body 2 form a crank shape through the fixing part 3.

The first shaft body 1 includes a first main journal 4, the second shaft body 2 includes a second main journal 5, in this embodiment, the fixing portion 3 is a fixing bearing sleeved on the outer surfaces of the first main journal 4 and the second main journal 5, and the first main journal 4 and the second main journal 5 are installed in the crankcase through the fixing bearing.

The fixing part 3 is provided with two coaxial and circular holes 301 with opposite hole directions, and any hole 301 is formed by the outer surface of the fixing part 3 sinking towards the inside of the fixing part 3; the two openings 301 may be axially connected, that is, a linear channel penetrating the fixing portion 3 is formed between the two openings 301, or may be axially cut off, that is, both the two openings 301 are blind holes or grooves.

The installation process of the first shaft body 1, the second shaft body 2 and the fixing part 3 is as follows: along the hole center line direction of the opening 301, the first main journal 4 and the second main journal 5 are respectively pressed into one of the openings 301, the pressing direction of the first main journal 4 is opposite to that of the second main journal 5, and after the pressing is completed, the first main journal 4 and the second main journal 5 are respectively in interference fit with one of the openings 301, so that the first main journal 4 and the second main journal 5 are respectively and fixedly connected with one of the openings 301; if the end of the first main journal 4 close to the second main journal 5 is an a end, and the end of the second main journal 5 close to the first main journal 4 is a B end, the profile of the a end and the profile of the B end may be overlapped with each other, or a gap is left between the profile of the a end and the profile of the B end along the hole center line direction of the opening 301; preferably, the end a and the profile B coincide with each other, i.e. one end of the first main journal 4 abuts against one end of the second main journal 5; preferably, the first main journal 4 and the second main journal 5 are pressed into one of the holes 301 by the same amount in the direction of the hole center line of the hole 301.

Among the prior art, split type bent axle includes: the bearing end half crankshaft comprises a first main journal and a 'first half crank journal', the gear end half crankshaft comprises a second main journal and a 'second half crank journal', and the 'first half crank journal' and the 'second half crank journal' are detachably connected, so that the bearing end half crankshaft and the gear end half crankshaft form a split crankshaft; the first half crank journal and the second half crank journal form a crank journal, a maintenance-free bearing is sleeved outside the crank journal, and a connecting rod is arranged outside the maintenance-free bearing and connected to the piston; when the crank shaft is used, the motor spindle drives the second main journal to rotate, and the second main journal transmits torque to the crank journal, so that the crank journal drives the connecting rod to move through the maintenance-free bearing; therefore, under the condition of rotation of the split-type crankshaft, the joint of the 'first half crank journal' and the 'second half crank journal' is subjected to both the torque applied by the maintenance-free bearing and the torque applied by the connecting rod and the torque generated by the 'second half crank journal' driving the 'first half crank journal' to rotate, and the joint of the 'first half crank journal' and the 'second half crank journal' is prone to fatigue, severe even fracture and failure of the crankshaft under the long-term action of the three torques.

In the scheme, the first shaft body 1 and the second shaft body 2 have the same structure, the first shaft body 1 is equivalent to a bearing end half crankshaft in the prior art, the second shaft body 2 is equivalent to a gear end half crankshaft in the prior art, and the scheme adopts the technical scheme that the first main journal 4 and the second main journal 5 are detachably connected to form the split type crankshaft, so that the technical scheme that the 'first half crank journal' and the 'second half crank journal' are detachably connected to form the split type crankshaft in the prior art is replaced; in the rotating process of the split type crankshaft, the connecting part of the first main journal 4 and the second main journal 5 needs to bear the torque applied by the fixing part 3, and the torque of the second main journal 5 driving the first main journal 4 to rotate; therefore, in this scheme, compare in prior art's technical scheme, the moment of torsion that the connecting rod was exerted has been avoided in the junction of first main journal 4 and second main journal 5, promptly, the detachable junction of split type bent axle compares in prior art detachable junction of split type bent axle in this scheme, and the effect moment quantity that receives still less, consequently, the detachable junction of split type bent axle is more reliable in this scheme.

In the above technical solution, how to prevent the first main journal 4 and the second main journal 5 from rotating relative to each other in the circumferential direction during the press-fitting process to the fixing portion 3 is a technical problem to be solved at present, and the solution is as follows.

The split type crankshaft further comprises a positioning structure, and the first main journal 4 and the second main journal 5 are positioned in the circumferential direction through the positioning structure.

Referring to fig. 2, the positioning structure is specifically configured as follows: a first positioning through hole 9 and a first guide through hole 10 are formed in the first main journal 4, a second positioning through hole 11 and a second guide through hole 12 are formed in the second main journal 5, wherein the axis of the first positioning through hole 9 is coaxial with the axis of the second guide through hole 12, and the axis of the second positioning through hole 11 is coaxial with the axis of the first guide through hole 10; the positioning structure comprises a first pin sleeve 13 and a second pin sleeve 14; one end of a first pin bush 13 is inserted into the first positioning through hole 9 and is in interference connection with the inner wall of the first positioning through hole 9, and the other end of the first pin bush is inserted into the second guiding through hole 12 and is in clearance connection with the inner wall of the second guiding through hole 12; one end of the second pin bushing 14 is inserted into the second positioning through hole 11 and is in interference connection with the inner wall of the second positioning through hole 11, and the other end of the second pin bushing is inserted into the first guiding through hole 10 and is in clearance connection with the inner wall of the first guiding through hole 10.

In the process that the first main journal 4 is inserted into one of the openings 301, the first main journal 4 drives the first pin sleeve 13 to be gradually inserted into the second guide through hole 12; in the process of inserting the second main journal 5 into one of the openings 301, the second main journal 5 drives the second pin sleeve 14 to be gradually inserted into the second positioning through hole 11.

The axis of the first positioning through hole 9 and the axis of the second guiding through hole 12 are coaxial, the axis extending direction of the first positioning through hole 9 and the axis extending direction of the second guiding through hole 12 are assumed to be the first direction, the axis of the second positioning through hole 11 and the axis extending direction of the first guiding through hole 10 are assumed to be coaxial, and the axis extending direction of the second positioning through hole 11 and the axis extending direction of the first guiding through hole 10 are assumed to be the second direction. The first direction and the second direction are parallel to each other, and the moving directions of the first pin sleeve 13 and the second pin sleeve 14 are parallel to each other and opposite to each other, so that the first main journal 4 and the second main journal 5 are guided in the first direction and the second direction which are parallel to each other when being inserted into one of the openings 301; in the rotation process of the split type crankshaft, the second main journal 5 transmits acting force to the first main journal 4 through the first pin sleeve 13 and the second pin sleeve 14, so that the first main journal 4 and the second main journal 5 rotate simultaneously, namely the first main journal 4 and the second main journal 5 are relatively static; in other words, due to the arrangement of the first pin sleeve 13 and the second pin sleeve 14, the relative rotation between the first main journal 4 and the second main journal 5 along the circumferential direction is limited, that is, the purpose of positioning the first main journal 4 and the second main journal 5 along the circumferential direction is achieved.

In the process that the first pin bushes 13 are mounted in the first positioning through holes 9 and the second pin bushes 14 are mounted in the second positioning through holes 11, how to prevent the first pin bushes 13 from being excessively or insufficiently arranged in the first positioning through holes 9 and how to prevent the second pin bushes 14 from being excessively or insufficiently arranged in the second positioning through holes 11 are provided.

Referring to fig. 2, a first step 15 is arranged in the first positioning through hole 9, and one end of the first pin sleeve 13 inserted into the first positioning through hole 9 abuts against the first step 15; a second step 16 is arranged in the second positioning through hole 11, and one end of the second pin sleeve 14 inserted into the second positioning through hole 11 abuts against the second step 16.

The first step 15 is arranged in the outline of the first positioning through hole 9, in the process that the first pin sleeve 13 is inserted into the first positioning through hole 9, the first step 15 blocks one end of the first pin sleeve 13 along the first direction, the first pin sleeve 13 can be abutted against the first step 15, and the first pin sleeve 13 is prevented from being excessively inserted into the first positioning through hole 9 along the axial direction; in addition, first step 15 has the prompt effect to the position that first cotter 13 inserted to first locating through-hole 9 along the axial, changes the angle, and at the in-process that first cotter 13 inserted first locating through-hole 9 along the axial, only when first cotter 13 and first step 15 butt, first cotter 13 just pressed fit in place along the axial, and the setting of first step 15 prevents effectively that first cotter 13 from inserting in first locating through-hole 9 along the axial too little.

The arrangement position, structure, shape and technical principle of the second step 16 are similar to those of the first step 15, and are not described herein again. Therefore, the present embodiment solves the technical problem of how to avoid the first pin sleeves 13 being too much or too little arranged in the first positioning through holes 9 and the second pin sleeves 14 being too much or too little arranged in the second positioning through holes 11.

In the foregoing technical solution, how to avoid the axial length of the first main journal 4 or the second main journal 5 inserted into the opening 301 from being too short is a technical problem to be solved; the technical solution to this problem is as follows.

The first crank journal 7 is far away from one side of the axis of the hole 301 and is provided with a first bulge 30 along the radial direction, and the second crank journal 8 is far away from one side of the axis of the hole 301 and is provided with a second bulge 31 along the radial direction; the fixing part 3 is arranged between the first bulge 30 and the second bulge 31, one end of the fixing part 3 is abutted against the first bulge 30, and the other end is abutted against the second bulge 31; the first projection 30 and the second projection 31 cover one of the pair of openings 301, respectively.

The first protrusion 30 can be provided in various shapes, for example, the first protrusion 30 can be a cylinder disposed on the outer surface of the first crank journal 7 and extending along the radial direction of the first crank journal 7, or can be a circular ring structure sleeved on the circumferential outer surface of the first crank journal 7, and the first protrusion 30 is used for abutting against one end of the fixing portion 3 and limiting the position of the fixing portion 3 along the axial direction of the fixing portion 3; the structure, arrangement and function of the second protrusion 31 are similar to those of the first protrusion 30, and are not described herein; in the process of press-fitting the first main journal 4 and the second main journal 5, an axial gap is formed between the first protrusion 30 and the second protrusion 31, and along with the gradual press-fitting of the first main journal 4 and the second main journal 5 into the fixing portion 3 from the two ends of the fixing portion 3, the axial gap is gradually reduced until the two ends of the fixing portion 3 abut against the first protrusion 30 and the second protrusion 31 respectively, and when the two ends of the fixing portion 3 abut against the first protrusion 30 and the second protrusion 31 respectively, the first main journal 4 and the second main journal 5 are press-fitted in place respectively.

In the present embodiment, due to the arrangement of the first protrusions 30 and the second protrusions 31, along the press-fitting direction of the first main journal 4, the axial position of the first main journal 4 is limited by the first protrusions 30, and along the press-fitting direction of the second main journal 5, the axial position of the second main journal 5 is limited by the second protrusions 31, so that excessive press-fitting of the first main journal 4 or the second main journal 5 is avoided; moreover, due to the arrangement of the first protrusions 30 and the second protrusions 31, the press-fitting positions of the first main journal 4 or the second main journal 5 along the axial direction have the functions of marking and indicating, that is, when two ends of the fixing part 3 abut against the first protrusions 30 and the second protrusions 31 respectively, the first main journal 4 and the second main journal 5 are respectively press-fitted in place, so that the situation that the press-fitting positions of the first main journal 4 or the second main journal 5 along the axial direction are too short can be effectively avoided; in summary, the present embodiment solves the technical problem that the axial length of the first main journal 4 or the second main journal 5 inserted into the opening 301 is too long or too short.

Further, the application also comprises the following technical scheme.

Referring to fig. 2 to 3, the first shaft body 1 further includes a first weight portion and a first crank journal 7, and the first weight portion is detachably connected to the first crank journal 7; the second shaft body 2 further comprises a second counterweight and a second crank journal 8, the second counterweight being detachably connected to the second crank journal 8.

Specifically, a first mounting through hole is axially formed in the first crank journal 7, one end of the first counterweight portion 17a penetrates through the first mounting through hole, a first threaded hole is formed in a portion of the first counterweight portion 17a penetrating through the first mounting through hole, internal threads are formed in the inner wall of the second pin sleeve 14, and a rod portion of the first screw 32 is in threaded connection with the second pin sleeve 14 and the first threaded hole respectively; the other end of the first weight portion 17a extends in a direction directed from the first guide through-hole 10 toward the first positioning through-hole 9; one end of the first counterweight part 17a is connected with the first crank journal 7, the other end is a free end, the first counterweight part 17a can be regarded as a cantilever structure arranged on the first crank journal 7, and the first counterweight part 17a is not interfered with the circumferential outer surface of the first crank journal 7; a second mounting through hole is axially formed in the second crank journal 8, one end of a second counterweight part 18a penetrates through the second mounting through hole, a second threaded hole is formed in the part, penetrating through the second mounting through hole, of the second counterweight part 18a, internal threads are formed in the inner wall of the first pin sleeve 13, and the rod part of a second screw 33 is in threaded connection with the first pin sleeve 13 and the second threaded hole respectively; the other end of the second weight portion 18a extends in a direction directed from the second guide through hole 12 toward the second positioning through hole 11, and the second weight portion 18a does not interfere with the circumferential outer surface of the second crank journal 8.

The first crank journal 7 is used for mounting a first piston connecting rod, and the first counterweight 17a is used for balancing the reciprocating inertia moment of the first piston connecting rod; the second crank journal 8 is used for mounting a second piston connecting rod, and the second counterweight 18a is used for balancing the reciprocating inertia moment of the first piston connecting rod; this effect is common knowledge and will not be described herein.

With further reference to fig. 2 to 3, in order to avoid the interference between the first screw 32 and the second piston rod in the axial direction of the fixing portion 3, the head of the first screw 32 may be disposed within the contour of the first positioning through hole 9, and the head of the first screw 32 abuts against the second step 16, it is noted that the head of the first screw 32 abuts against one side of the second step 16, and the second pin sleeve 14 abuts against the other side of the second step 16; similarly, in order to avoid the interference between the second screw 33 and the first piston rod in the axial direction of the fixing portion 3, the head of the second screw 33 may be disposed within the contour of the second positioning through hole 11, and the head of the second screw 33 abuts against the first step 15, and it is noted that the head of the second screw 33 abuts against one side of the first step 15, and the first pin sleeve 13 abuts against the other side of the first step 15.

Since the head of the first screw 32 is disposed in the contour of the first positioning through hole 9, the rod of the first screw 32 is respectively in threaded connection with the second pin sleeve 14 and the first threaded hole, that is, the contour of the first screw 32 is surrounded by the split crankshaft, the first screw 32 does not protrude out of the split crankshaft in the axial direction, and a distance exists between the second piston connecting rod and the split crankshaft in the axial direction of the fixing portion 3, so that the first screw 32 and the second piston connecting rod do not interfere in the axial direction of the fixing portion 3. The structure and the arrangement principle of the second screw 33 are similar to those of the first screw, and are not described herein again.

In the present embodiment, referring to fig. 3, as a preferable mode, the first mounting through hole is a tapered through hole, wherein one end of the first mounting through hole, which is far away from the first main journal 4, is a first mouth portion, one end of the first mounting through hole, which is close to the first main journal 4, is a second mouth portion, and the caliber of the first mouth portion is larger than that of the second mouth portion; accordingly, the portion of the first weight portion 17a inserted into the first mounting through hole is also provided in a conical shape, wherein the portion of the first weight portion 17a to be inserted into the first mounting through hole is defined as: one end close to the first main journal 4 is a narrowing end, the part far away from the first main journal 4 is an enlarging end, and the diameter of the enlarging end is larger than that of the narrowing end; when the first weight portion 17a is to be inserted into the first mounting through-hole but is not yet inserted into the first mounting through-hole, since the diameter of the first mouth portion is much larger than the narrowed end, the narrowed end is easily confined within the contour of the first mouth portion; the first counterweight part 17a is continuously inserted into the first mounting through hole along the axial direction, and the first mounting through hole gradually narrows from the first opening part to the second opening part, so that the hole wall of the first mounting through hole has the functions of guiding and limiting the outline of the first counterweight part 17 a; when the narrowed end moves to the second mouth portion, the narrowed end is restricted from radial displacement by the second mouth portion, the enlarged end is restricted from radial displacement by the first mouth portion, and the first weight portion 17a stops axial movement.

Therefore, in the present embodiment, the first mounting through hole is provided as a tapered through hole, and the portion of the first weight portion 17a inserted into the first mounting through hole is also provided as a conical shape, so that the first weight portion 17a is more easily inserted into the first mounting through hole. Similarly, the structure, principle and technical effect of the second mounting through hole are similar to those of the first mounting through hole, and are not described herein again.

Further, in order to avoid that the part of the first counterweight part 17a inserted into the first mounting through hole and the hole wall of the first mounting through hole move radially, a first accommodating groove is further formed in the hole wall of the first mounting through hole, a first clamping groove is formed in the first counterweight part 17a, the bottom of the first clamping pin is inserted into the first clamping groove, and the top of the first clamping pin is abutted against the groove wall of the first accommodating groove; a second accommodating groove is further formed in the hole wall of the second mounting through hole, a second clamping groove is formed in the second counterweight portion 18a, the bottom of the second bayonet lock is inserted into the second clamping groove, and the top of the second bayonet lock is abutted to the groove wall of the second accommodating groove.

The top of first bayonet lock and the cell wall in close contact with of first storage tank, the cell wall in close contact with in bottom and first block groove, make the part that first counter weight portion 17a inserted in the first mounting through hole have the trend of pasting tight first mounting through hole one side inner wall, it says to change the angle, the profile of the at least one department's cross section of first mounting through hole in the axial, coincide with the common profile of constituteing of first counter weight portion 17a and first bayonet lock, the pore wall of first mounting through hole has restricted the radial motion of first counter weight portion 17a and first bayonet lock, and then avoid first counter weight portion 17a to radially move about for first mounting through hole. The technical principles and technical effects of the second weight portion 18a, the second bayonet lock and the second mounting through hole are similar to those described above, and are not described herein again.

With further reference to fig. 2 to 3, a first discharging hole 38 is further disposed in the first protrusion 30, and the first discharging hole 38 is communicated with the first mounting through hole; a second discharge hole 39 is further formed in the second protrusion 31, and the second discharge hole 39 is communicated with the second mounting through hole.

During machining, the first mounting through hole and the first accommodating groove are formed by turning, namely materials are removed from the first shaft body, however, during machining, as the tool bit needs to extend into the first shaft body, the turned metal waste is shielded by the tool bit and is inconvenient to discharge; the first discharging hole 38 is arranged in the embodiment and used for timely discharging and cleaning metal waste materials, so that the problems that the metal waste materials in the first mounting through hole are accumulated and are not timely discharged, the tool bit is excessively abraded and the like are solved; the design principle and technical effect of the second discharging hole 39 are similar to those of the first discharging hole 38, and are not described herein again.

Further, in order to reduce the mass of the crankshaft, the first main journal 4 is further provided with a first weight removing portion 36, the first weight removing portion 36 is formed to remove a part of the material of the first main journal 4, and the first weight removing portion 36 is recessed from one side end surface of the first main journal 4 toward the inside of the first main journal 4; the second main journal 5 is further provided with a second weight removing portion 37, the second weight removing portion 37 is formed by removing a part of material of the second main journal 5, and the second weight removing portion 37 is recessed from one side end of the second main journal 5 toward the inside of the second main journal 5.

Example 2

The present embodiment is modified based on embodiment 1, and the same components as those in embodiment 1 will be denoted by the same reference numerals and detailed description thereof will be omitted, and only the modified structure will be described in detail below.

Referring to fig. 4, the first balance weight portion 17b is disposed on the circumferential outer surface of the first main journal 4, the first balance weight portion 17b includes a first small diameter region 17b-1 and a first large diameter region 17b-2, the first small diameter region 17b-1 is located between the first large diameter region 17b-2 and the first crank journal 7, and the first large diameter region 17b-2 and the first crank journal 7 are located on both sides of the axis of the first main journal 4, respectively; the second counterweight part 18b is disposed on the circumferential outer surface of the second main journal 5, the second counterweight part 18b includes a second small-diameter region 18b-1 and a second large-diameter region 18b-2, the second small-diameter region 18b-1 is located between the second large-diameter region 18b-2 and the second crank journal 8, and the second large-diameter region 18b-2 and the second crank journal 8 are located on two sides of the axis of the second main journal 5.

This embodiment is a modification of embodiment 1, in which embodiment 1, a portion of the first weight portion 17a is axially detachably connected to the first crank journal 7, and a portion of the second weight portion 18a is axially detachably connected to the second crank journal 8;

in this embodiment, the first weight portion 17b is radially connected to the first main journal 4, and the second weight portion 18b is radially connected to the second main journal 5, which can save the axial space of the split crankshaft and is suitable for the installation condition that the axial space of the crankcase is narrow but the radial space is sufficient, compared with embodiment 1.

Example 3

The present embodiment is modified from embodiment 1, and the same components as those in embodiment 1 will be denoted by the same reference numerals and detailed description thereof will be omitted, and only the modified structure will be described in detail below.

Referring to fig. 5, an end surface of the first main journal 4 on a side away from the first crank journal 7 is a first mounting surface 24, the first main journal 4 is provided with a first weight-reducing region 25 and a first non-weight-reducing region 26, wherein the first weight-reducing region 25 is recessed towards the inside of the first main journal 4 along the first mounting surface 24, a first preset distance is arranged between the contour of the first weight-reducing region 25 and the axis of the first crank journal 7, and the contour of the first non-weight-reducing region 26 and the axis of the first crank journal 7 are separated by the contour of the first weight-reducing region 25; the end face of one side of the second main journal 5 far away from the second crank journal 8 is a second mounting surface 27, the second main journal 5 is provided with a second weight-reducing region 28 and a second non-weight-reducing region 29, wherein the second weight-reducing region 28 is recessed towards the inside of the second main journal 5 along the second mounting surface 27, a second preset distance is arranged between the contour of the second weight-reducing region 28 and the axis of the second crank journal 8, and the contour of the second non-weight-reducing region 29 and the axis of the second crank journal 8 are separated by the contour of the second weight-reducing region 28.

In the present embodiment, the first weight-reduction region 25 and the first crank journal 7 are both disposed on the same side of the first non-weight-reduction region 26, in other words, the first non-weight-reduction region 26 can be regarded as a counterweight balancing portion of the first crank journal 7, that is, the counterweight balancing portion of the first crank journal 7 is disposed in the split crankshaft; compare in embodiment 1, reach the effect of practicing thrift split type bent axle installation space more.

Example 4

An air compressor comprising the split type crankshaft of any one of embodiments 1 to 3.

Referring to fig. 6, the fixing portion 3 is a support bearing, and the split crankshaft is fixed on the inner wall of the chassis of the air compressor through the support bearing.

The pair of connecting rods are respectively and rotatably connected with one of the first crank journal 7 and the second crank journal 8; the coupling mechanism further comprises a power mechanism 23, a coupling driving end 21 and a coupling driven end 22, wherein the power mechanism 23 is coaxially arranged with the first main journal 4 and the coupling driving end 21; the portion of the second weight portion 18a forms a coupling driven end 22, and the coupling driving end 21 is connected to the coupling driven end 22.

The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that various changes and modifications can be made by those skilled in the art without departing from the spirit of the utility model, and these changes and modifications are all within the scope of the utility model. Therefore, the protection scope of the present patent should be subject to the appended claims.

Claims (10)

1. A split crankshaft, comprising: the first shaft body (1), the second shaft body (2) and the fixing part (3), wherein the first shaft body (1) and the second shaft body (2) have the same structure; the fixing part (3) is provided with two openings (301), the hole center lines of the two openings (301) are arranged coaxially, the radial sections of the two openings (301) are circular, and the opening directions of the two openings (301) are opposite;

the first shaft body (1) comprises a first main journal (4), the second shaft body (2) comprises a second main journal (5), and the first main journal (4) and the second main journal (5) are in interference connection with the inner wall of one of the openings (301) respectively;

the first shaft body (1) and the second shaft body (2) form a crankshaft shape through the fixing part (3).

2. The split crankshaft according to claim 1, further comprising a positioning structure, wherein the first main journal (4) and the second main journal (5) are circumferentially positioned by the positioning structure.

3. The split-type crankshaft according to claim 2, wherein the first main journal (4) is provided with a first positioning through hole (9) and a first guide through hole (10), the second main journal (5) is provided with a second positioning through hole (11) and a second guide through hole (12), wherein the axis of the first positioning through hole (9) is coaxial with the axis of the second guide through hole (12), and the axis of the second positioning through hole (11) is coaxial with the axis of the first guide through hole (10);

the positioning structure comprises a first pin sleeve (13) and a second pin sleeve (14);

one end of the first pin bush (13) is inserted into the first positioning through hole (9) and is in interference connection with the inner wall of the first positioning through hole (9), and the other end of the first pin bush is inserted into the second guiding through hole (12) and is in clearance connection with the inner wall of the second guiding through hole (12);

one end of the second pin sleeve (14) is inserted into the second positioning through hole (11) and is in interference connection with the inner wall of the second positioning through hole (11), and the other end of the second pin sleeve is inserted into the first guiding through hole (10) and is in clearance connection with the inner wall of the first guiding through hole (10).

4. The split type crankshaft according to claim 3, wherein a first step (15) is arranged in the first positioning through hole (9), and one end of the first pin sleeve (13) inserted into the first positioning through hole (9) is abutted to the first step (15);

a second step (16) is arranged in the second positioning through hole (11), and one end, inserted into the second positioning through hole (11), of the second pin sleeve (14) is abutted to the second step (16).

5. The split crankshaft according to claim 1, wherein the first shaft body (1) further comprises a first weight and a first crank journal (7), the first weight and the first crank journal (7) being detachably connected;

the second shaft body (2) further comprises a second counterweight and a second crank journal (8), and the second counterweight and the second crank journal (8) are detachably connected.

6. The split-type crankshaft according to claim 5, wherein one end of the first weight portion (17a) penetrates the first crank journal (7) and forms a detachable connection with the second pin bushing (14) by a first screw (32); the other end of the first weight portion (17a) extends in a direction directed from the first guide through hole (10) to the first positioning through hole (9); the first weight (17a) does not interfere with the circumferential outer surface of the first crank journal (7);

one end of the second counterweight part (18a) penetrates through the second crank journal (8) and is detachably connected with the first pin sleeve (13) through a second screw (33); the other end of the second weight portion (18a) extends in a direction from the second guide through hole (12) toward the second positioning through hole (11); the second weight portion (18a) does not interfere with the circumferential outer surface of the second crank journal (8).

7. The split type crankshaft according to claim 5, wherein the first weight portion (17b) is provided on the circumferential outer surface of the first main journal (4), the first weight portion (17b) includes a first small diameter region (17b-1) and a first large diameter region (17b-2), the first small diameter region (17b-1) is located between the first large diameter region (17b-2) and the first crank journal (7), and the first large diameter region (17b-2) and the first crank journal (7) are respectively located on both sides of the axis of the first main journal (4);

the second counterweight part (18b) is arranged on the circumferential outer surface of the second main journal (5), the second counterweight part (18b) comprises a second small-diameter area (18b-1) and a second large-diameter area (18b-2), the second small-diameter area (18b-1) is located between the second large-diameter area (18b-2) and the second crank journal (8), and the second large-diameter area (18b-2) and the second crank journal (8) are located on two sides of the axis of the second main journal (5) respectively.

8. The split-type crankshaft according to claim 1, wherein an end surface of one side of the first main journal (4) far away from the first crank journal (7) is a first mounting surface (24), the first main journal (4) is provided with a first weight-reducing region (25) and a first non-weight-reducing region (26), the first weight-reducing region (25) is recessed towards the inside of the first main journal (4) along the first mounting surface (24), a first preset distance is arranged between the contour of the first weight-reducing region (25) and the axis of the first crank journal (7), and the contour of the first non-weight-reducing region (26) and the axis of the first crank journal (7) are separated by the contour of the first weight-reducing region (25);

the end face of one side, away from the second crank journal (8), of the second main journal (5) is a second mounting surface (27), the second main journal (5) is provided with a second weight reduction region (28) and a second non-weight reduction region (29), the second weight reduction region (28) is recessed towards the interior of the second main journal (5) along the second mounting surface (27), a second preset distance is arranged between the contour of the second weight reduction region (28) and the axis of the second crank journal (8), and the contour of the second non-weight reduction region (29) and the axis of the second crank journal (8) are isolated by the contour of the second weight reduction region (28).

9. An air compressor, characterized by comprising the split type crankshaft of any one of claims 1 to 8.

10. The air compressor as claimed in claim 9, wherein the fixing portion (3) is a support bearing, and the split crankshaft is fixed to an inner wall of the casing of the air compressor through the support bearing.

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