CN218702681U - Suspension structure for engine mounted on sweeper - Google Patents

Abstract

The utility model discloses a motor sweeper facial make-up is suspension structure for engine, include: a first stage suspension and a second stage suspension. The first-stage suspension comprises two groups of front suspension assemblies and two groups of rear suspension assemblies, the two groups of front suspension assemblies are symmetrically arranged along the forward direction of the sweeper and along the center line of the auxiliary engine crankshaft to be connected with the front fan end of the engine in a vibration damping mode respectively, and the two groups of rear suspension assemblies are symmetrically arranged along the forward direction of the sweeper and along the center line of the auxiliary engine crankshaft to be connected with the rear output end of the engine in a vibration damping mode respectively. The second-stage suspension comprises multiple groups of second-stage suspension components, and the multiple groups of second-stage suspension components are arranged between the auxiliary engine mounting frame and the auxiliary frame. The novel suspension structure has the advantages that the offset of the engine under the action of lateral force can be effectively limited by the symmetrical arrangement mode, the parallelism and coplanarity among belt wheels are ensured, and the belt is stressed uniformly; and simultaneously, the vibration transmitted to the auxiliary frame, the chassis and the whole engine by the engine is weakened.

Description

Suspension structure for engine mounted on sweeper

Technical Field

The utility model relates to a rubbish motor sweeper technical field especially relates to a motor sweeper facial make-up suspension structure for engine.

Background

When the engine on the sweeper works, the engine can generate vibration in six directions with different frequencies, so that the suspension assembly for mounting the engine must ensure six degrees of freedom to meet the requirement of the running working condition of the engine. The existing sweeper mostly adopts the fan and the engine to arrange the pattern from front to back, and when in operation, the engine can be pulled by the lateral tension of the fan, so that the engine generates deviation, and along with the aging of the damping cushion, the deviation phenomenon is aggravated year by year, the belt grinding of the fan belt occurs in the later stage, the belt jumping occurs, and the service life is greatly reduced.

The existing suspension assembly is a common axle sleeve type suspension for a vehicle, and as shown in fig. 1, the suspension assembly is composed of a suspension cushion, suspension support legs, an upper cover of the suspension cushion and a mounting seat of the suspension cushion. The requirement of six degrees of freedom of the engine can be guaranteed, the mounting gap is large, the lateral displacement resistance of the cushion is weak, and the limiting function is limited.

The existing suspension structure mainly depends on the matching of a spherical gasket and a conical hole, eliminates a reserved mounting gap, and limits the deviation of the engine in the left and right directions by means of the contact of the step surface of a suspension supporting leg and the end surface of a cushion. However, under the pulling of the pretightening force of the belt, the bolt can drive the ball pad and the taper hole to generate relative displacement, the installation gap is exposed, and the offset space of the engine is reserved, so that the original parallelism and coplanarity among the belt wheels are all out of tolerance, the stress among the belts is uneven, and the service life of the belt is greatly shortened; in addition, the big terminal surface rubber thickness of cushion is limited, collides with the inside skeleton of cushion behind the rubber of this thickness of engine skew compression, can transmit a large amount of vibrations to sub vehicle frame, after long-time use, can cause the vibration of certain degree to destroy to other portion's of motor sweeper dress, seriously influences the reputation degree of product outside.

SUMMERY OF THE UTILITY MODEL

The utility model provides a suspension structure for motor sweeper facial make-up to the belt that solves current suspension structure existence easily squints and the atress is uneven, the belt is short-lived, and the vibration easily transmits sub vehicle frame, chassis and complete machine, and other portion dress easily appear vibrating the technical problem who destroys on the motor sweeper.

The utility model adopts the technical scheme as follows:

a suspension structure for a motor of a sweeper truck, comprising: a first stage mount for vibration-damped mounting of the engine, and a second stage mount for reduced vibration transmission; the first-stage suspension comprises two groups of front suspension assemblies and two groups of rear suspension assemblies which are sequentially arranged along the forward direction of the sweeper, the front suspension assemblies and the rear suspension assemblies are respectively arranged on an auxiliary engine mounting frame, the two groups of front suspension assemblies are symmetrically arranged along the forward direction of the sweeper and along the central line of an auxiliary engine crankshaft and are used for being connected with a front fan end of an engine in a vibration damping mode respectively, and the two groups of rear suspension assemblies are symmetrically arranged along the forward direction of the sweeper and along the central line of the auxiliary engine crankshaft and are used for being connected with a rear output end of the engine in a vibration damping mode respectively; the second level suspension includes multiunit second level suspension subassembly, and multiunit second level suspension subassembly branch is located between vice engine mounting bracket and the sub vehicle frame to be used for reducing the vibration transmission between vice engine mounting bracket and the sub vehicle frame.

Furthermore, the rear suspension assembly comprises two rear suspension mounting seats arranged at intervals along the front traveling direction of the sweeper, a rear suspension leg rotatably supported between the two rear suspension mounting seats, and a rear suspension cushion assembly arranged between the rear suspension leg and the corresponding rear suspension mounting seat; the rear overhang mounting base is connected with the auxiliary engine mounting frame; two rear suspension supporting legs of the two groups of rear suspension assemblies are respectively biased to form acute angles towards the vertical central plane of the auxiliary engine crankshaft of the sweeper so as to be used for obliquely supporting the engine by deflecting the vertical plane.

Furthermore, a first mounting through hole is formed in the rear suspension mounting seat; the rear suspension support leg comprises an installation head connected with an engine, an installation shaft connected with the installation head, and two limiting steps sequentially arranged on the outer circle of the installation shaft at intervals; the mounting shaft penetrates through the first mounting through hole on the corresponding side, and the limiting step is positioned between the two rear suspension mounting seats; the rear suspension cushion assembly is sleeved on the excircle of the mounting shaft, and the end part of the rear suspension cushion assembly is clamped between the limiting step and the side end face of the rear suspension mounting seat.

Furthermore, the rear suspension cushion assembly is cylindrical and comprises a first limiting section and a first vibration reduction section which are arranged along the axial direction, and the outer diameter of the first limiting section is larger than that of the first vibration reduction section; the first vibration reduction section is arranged on the excircle of the first mounting shaft and is positioned in the first mounting through hole; the first limiting section is clamped between the corresponding limiting step and the side end face of the rear overhang mounting seat.

Furthermore, the rear suspension mounting seat comprises a rear suspension cushion base and a rear suspension cushion upper cover which are horizontally split along the center of the first mounting through hole; the rear suspension cushion base is detachably fixed with the auxiliary engine mounting frame; the upper cover of the rear suspension soft cushion is detachably fixed with the base of the rear suspension soft cushion.

Further, the front suspension assembly comprises front suspension legs connected with the auxiliary engine mounting frame and a front suspension cushion connected to the front suspension legs; two front suspension supporting legs of the two groups of front suspension assemblies are respectively biased towards a vertical central plane of an auxiliary engine crankshaft of the sweeper at an acute angle so as to be used for obliquely supporting the engine by a deflected vertical plane.

Furthermore, the front suspension support leg comprises a vertical support which is vertically arranged and detachably fixed with the auxiliary engine mounting frame, and a mounting plate which is obliquely fixed at the top end of the vertical support, wherein the mounting plate is provided with a positioning hole which penetrates through the mounting plate; the front suspension cushion comprises a square body, a connecting rod and a connecting column, wherein the connecting rod and the connecting column are connected to two opposite ends of the square body, the connecting column penetrates through the positioning hole and then is fastened through a nut to be detachably fixed with the mounting plate, and the connecting rod is detachably fixed with the engine.

Further, the multiunit second grade suspension subassembly is equallyd divide for two sets of second grade suspension groups that set up along the width direction of motor sweeper is relative, and the multiunit second grade suspension subassembly in every group second grade suspension group sets up along the direction of moving ahead of motor sweeper interval in proper order, and the second grade suspension subassembly one-to-one in two sets of second grade suspension groups sets up.

Further, the secondary suspension component comprises a secondary mounting seat, a secondary supporting leg and a secondary cushion assembly for reducing vibration transmission; the secondary mounting seat is connected to the auxiliary frame; the secondary supporting legs penetrate through the secondary mounting seat, and the end parts of the secondary supporting legs are connected with the auxiliary engine mounting frame; the second-level cushion assembly is arranged between the second-level supporting leg and the corresponding second-level mounting seat.

Furthermore, a second mounting through hole is formed in the second-stage mounting seat, the second-stage mounting seat comprises a second-stage cushion base and a second-stage cushion upper cover which are horizontally split along the center of the second mounting through hole, the second-stage cushion base is detachably fixed with the auxiliary frame, and the second-stage cushion upper cover is detachably fixed with the second-stage cushion base; the second grade cushion assembly is the tube-shape, includes along spacing section of second and the second damping section of axial setting, and the external diameter of the spacing section of second is greater than the external diameter of second damping section, and the second damping section is installed on the excircle of second grade landing leg, and is arranged in second installation through-hole, and the spacing section chucking of second is in between the side end face of vice engine mount bracket and the second grade mount pad that corresponds.

The utility model discloses following beneficial effect has:

compared with the prior art that the front fan end of the engine passes through two points, the rear output end passes through one point, and the three-point supporting mode is three points in total, the suspension structure for the engine mounted on the sweeper not only comprises a first-stage suspension which is symmetrically arranged (two groups of front suspension assemblies and two groups of rear suspension assemblies are symmetrically arranged along the advancing direction of the vehicle and along the central line of an auxiliary engine crankshaft respectively), and effectively ensures the six degrees of freedom of the engine under the condition that the output end is subjected to strong lateral tension, but also can effectively limit the offset of the engine under the lateral force effect by the symmetrical arrangement mode, ensures the original parallelism and coplanarity between belt wheels, and has uniform stress on the belt, thereby prolonging the service life of the belt, and simultaneously can effectively weaken the vibration transmitted from the engine to an auxiliary engine mounting frame; the auxiliary engine mounting frame is arranged on the auxiliary engine mounting frame, and the auxiliary engine mounting frame is arranged on the auxiliary engine mounting frame; in addition, the utility model discloses a suspension structure itself does not have motion, simple structure, reliable.

In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be described in further detail with reference to the drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. In the drawings:

FIG. 1 is a schematic view of a prior art suspension structure;

FIG. 2 is a schematic view of a suspension structure for an engine on a sweeper truck according to a preferred embodiment of the present invention;

FIG. 3 is a schematic top view of the first stage suspension of FIG. 2;

FIG. 4 is a schematic layout view of two sets of front suspension assemblies of FIG. 3;

FIG. 5 is a disassembled schematic view of the front suspension assembly of FIG. 4;

FIG. 6 is a schematic layout of the two sets of rear suspension assemblies of FIG. 3;

FIG. 7 is a schematic view of the spatial configuration of the rear suspension assembly of FIG. 6;

FIG. 8 is a partial cross-sectional front view structural schematic of FIG. 7;

FIG. 9 is a schematic top view of the second stage suspension of FIG. 2;

figure 10 is a schematic layout of the secondary suspension assembly of figure 9.

Description of the figures

1. A first stage of suspension; 10. a front suspension assembly; 11. a front suspension leg; 12. a front suspension pad; 20. a rear suspension assembly; 21. a rear overhang mounting base; 211. a rear suspension cushion base; 212. the rear suspension soft cushion is covered with an upper cover; 22. a rear suspension leg; 221. a mounting head; 222. installing a shaft; 223. a limiting step; 23. a rear suspension cushion assembly; 30. a sub-engine mount; 40. a secondary suspension assembly; 41. a secondary mount; 411. a secondary cushion base; 412. a secondary soft cushion upper cover; 42. a secondary support leg; 43. a secondary cushion assembly; 50. An engine; 60. and (3) a subframe.

Detailed Description

The embodiments of the invention will be described in detail hereinafter with reference to the drawings, but the invention can be implemented in many different ways, which will be defined and covered hereinafter.

Referring to fig. 2, 3 and 9, a preferred embodiment of the present invention provides a suspension structure for a motor sweeper to be mounted on an engine, including: a first stage mount 1 for vibration damping mounting of the engine 50, and a second stage mount for reducing the transmission of vibrations. First order suspension includes two sets of preceding suspension subassemblies 10 and two sets of back suspension subassemblies 20 that set gradually along the motor sweeper advancing direction, preceding suspension subassembly 10 and back suspension subassembly 20 set up respectively on vice engine mounting bracket 30, and two sets of preceding suspension subassemblies 10 along the motor sweeper advancing direction and with vice crankshaft centre line symmetry setting of sending out, be used for being connected with the front fan end damping of engine respectively, two sets of back suspension subassemblies 20 along the motor sweeper advancing direction and with vice crankshaft centre line symmetry setting of sending out, be used for being connected with the back output damping of engine respectively. The second stage mount includes multiple sets of second stage mount assemblies 40, with multiple sets of second stage mount assemblies 40 being disposed between secondary engine mount 30 and subframe 60 for reducing vibration transmission between secondary engine mount 30 and subframe 60.

Compared with the existing suspension structure for the engine on the sweeper, which has the advantages that the front fan end of the engine passes through two points, the rear output end passes through one point and the three-point supporting mode is three points in total, the suspension structure for the engine on the sweeper not only comprises a first-stage suspension which is symmetrically arranged (two groups of front suspension assemblies 10 and two groups of rear suspension assemblies 20 are symmetrically arranged along the advancing direction of the vehicle and along the central line of an auxiliary engine crankshaft respectively), and effectively ensures six degrees of freedom of the engine 50 under the condition that the output end is subjected to strong lateral tension, but also can effectively limit the offset of the engine under the lateral force effect by the symmetrical arrangement mode, ensures the original parallelism and coplanarity between belt wheels, and ensures the uniform stress of the belt, thereby prolonging the service life of the belt and simultaneously effectively weakening the vibration transmitted to the auxiliary engine mounting frame 30 by the engine; meanwhile, the vibration isolation structure also comprises a plurality of groups of secondary suspension assemblies 40 which are respectively arranged between the auxiliary engine mounting frame 30 and the auxiliary frame so as to further weaken the vibration transmitted from the engine to the auxiliary frame, the chassis and the whole machine, greatly improve the vibration isolation rate and further effectively improve the service life of other parts, such as phenomena of single belt overload, eccentric wear, belt jump and the like caused by uneven belt stress due to the deviation of the engine, and phenomena of accessory desoldering, cracking and the like caused by excessive vibration of the engine, so that the customer experience can be greatly improved, and the reputation of products can be increased; in addition, the utility model discloses a suspension structure itself does not have motion, simple structure, reliable.

Alternatively, as shown in fig. 3 and 6, the rear suspension assembly 20 includes two rear suspension mounting seats 21 spaced apart from each other in the forward direction of the sweeper truck, a rear suspension leg 22 rotatably supported between the two rear suspension mounting seats 21, and a rear suspension cushion assembly 23 disposed between the rear suspension leg 22 and the corresponding rear suspension mounting seat 21. The rear overhang mount 21 is connected to the sub-engine mount 30. The two rear suspension legs 22 of the two sets of rear suspension assemblies 20 are respectively biased at an acute angle towards the vertical central plane of the secondary engine crankshaft of the sweeper for obliquely supporting the engine on the deflected vertical plane. In this alternative, as shown in fig. 6, two sets of rear suspension assemblies 20 are used for obliquely supporting the engine by deflecting the vertical surface, and on one hand, are used for connecting and matching with the oblique installation surface on the engine so as to stably support the engine and prevent the engine from being deviated by lateral pulling force; on the other hand, the rear overhang support leg 22 is rotatably supported between the two rear overhang mounting seats 21, so that six degrees of freedom of the engine under the condition that the output end of the engine is subjected to strong lateral tension are guaranteed, meanwhile, the vibration of the engine is transmitted along the circumferential direction of the rear overhang mounting seats 21, the vibration transmitted to the auxiliary engine mounting frame 30 by the engine is weakened, and the service lives of other parts are effectively prolonged.

In this alternative, as shown in fig. 7 and 8, a first mounting through hole is formed in the rear overhang mounting base 21. The rear overhang leg 22 includes a mounting head 221 for connecting to an engine, a mounting shaft 222 connected to the mounting head 221, and two limiting steps 223 sequentially arranged on the outer circle of the mounting shaft 222 at intervals. The mounting shaft 222 is inserted into the first mounting through hole on the corresponding side, and the limiting step 223 is located between the two rear overhang mounting seats 21. The rear suspension cushion assembly 23 is sleeved on the outer circle of the mounting shaft 222, and the end part is clamped between the limit step 223 and the side end face of the rear suspension mounting seat 21. In this alternative, the included angle between the mounting surfaces of the two sets of mounting heads 221 is 30 ° and is connected with the upper inclined mounting surface of the engine in a matching manner. In this alternative, the rear suspension leg 22 is simple in construction, easy to manufacture, and simple to install.

In this alternative, as shown in fig. 7 and 8, the rear suspension cushion assembly 23 is cylindrical, and includes a first limiting section and a first damping section that are axially disposed, and an outer diameter of the first limiting section is greater than an outer diameter of the first damping section. The first vibration reduction section is installed on the outer circle of the first installation shaft 222 and is located in the first installation through hole. The first limit section is clamped between the corresponding limit step 223 and the side end face of the rear overhang mounting seat 21. In this alternative, the rear suspension cushion assembly 23 is simple in structure and easy to install, position and fasten.

In this alternative, as shown in fig. 7 and 8, the rear suspension mount 21 includes a rear suspension pad base 211 and a rear suspension pad upper cover 212, which are horizontally split along the center of the first mounting through hole. The rear suspension pad base 211 is detachably fixed to the sub-engine mount 30. The upper cover 212 of the rear suspension cushion is detachably fixed with the base 211 of the rear suspension cushion. Compare among the current suspension structure rear overhang mount pad and be overall structure, in this alternative, rear overhang mount pad 21 includes the rear overhang cushion base 211 and the rear overhang cushion upper cover 212 that set up along the central horizontal subdivision of first mounting hole, thereby be convenient for cooperation between them with rear overhang cushion assembly 23 be fixed in the first mounting hole of rear overhang mount pad 21, thereby eliminate the installation clearance that first mounting hole reserved, prevent that the bolt from driving rear overhang cushion assembly 23 and first mounting hole and taking place relative displacement, zero clearance between first mounting hole and the rear overhang cushion assembly 23, thereby the engine does not have the skew space, can effectively guarantee original parallel degree and coplanarity between the band pulley, the atress is even between the belt, finally, the life of belt is greatly improved.

In this alternative, the installation process of the rear suspension assembly 20 is: firstly, the mounting heads 221 of the rear suspension legs 22 form an included angle of 30 degrees and are connected with an engine through bolts; then the first limit section of the rear suspension cushion assembly 23 is inserted inwards into the left and right overhanging mounting shafts 222 of the rear suspension support legs 22; then, the rear suspension pad mount 211 is mounted on the upper surface of the sub-engine mount 30 and fixed by four bolts at the bottom thereof; then, a first vibration reduction section of the rear suspension cushion assembly 23 is arranged on the concave circular surface of the rear suspension cushion base 211, and the inner side of a first limiting section of the rear suspension cushion assembly 23 is in contact with the end surface of the rear suspension cushion base 211 for limiting; finally, the upper cover 212 of the rear suspension cushion and the base 211 of the rear suspension cushion are fixedly connected through bolts. The rear suspension assembly 20 is simple to install and position.

Alternatively, as shown in fig. 3 and 4, the front suspension assembly 10 includes a front suspension leg 11 connected to the secondary engine mount 30, and a front suspension pad 12 connected to the front suspension leg 11. Two front suspension legs 11 of the two groups of front suspension assemblies 10 are respectively biased to form an acute angle towards the vertical central plane of a secondary engine crankshaft of the sweeper for obliquely supporting the engine by deflecting the vertical plane. In this alternative, as shown in fig. 4, two sets of front suspension assemblies 10 are used for obliquely supporting the engine by deflecting the vertical surface, and on one hand, are used for being connected and matched with an oblique mounting surface on the engine so as to stably support the engine and prevent the engine from being deviated by lateral tension; on the other hand, the auxiliary engine mounting frame is used for weakening the vibration transmitted to the auxiliary engine mounting frame 30 by the engine, and the service life of other parts is effectively prolonged.

In this alternative, as shown in fig. 5, the front suspension leg 11 includes a vertical support vertically disposed and detachably fixed to the sub-engine mounting bracket 30, and a mounting plate obliquely fixed to a top end of the vertical support, and the mounting plate is provided with a positioning hole penetrating through the mounting plate. The front suspension cushion 12 comprises a square body, and a connecting rod and a connecting column which are connected to two opposite ends of the square body, the connecting column is fastened through a nut after penetrating through a positioning hole so as to be detachably fixed with the mounting plate, and the connecting rod is detachably fixed with the engine. In this alternative, the front suspension assembly 10 is simple in construction and easy to install, position and secure.

In this alternative, as shown in fig. 5, the installation process of the front suspension assembly 10 is: firstly, connecting the front suspension cushion 12 with an engine through a bolt at an included angle of 90 degrees; then the front suspension cushion 12 is positioned by two connecting columns at the bottom and is nested with the front suspension supporting legs 11, and then the front suspension cushion is fixed by two bolts; finally, the front suspension leg 11 and the auxiliary engine mounting frame 30 are fixed through four bolts at the bottom.

Alternatively, as shown in fig. 9, the multiple sets of secondary suspension assemblies 40 are equally divided into two sets of secondary suspension sets oppositely arranged in the width direction of the sweeper, the multiple sets of secondary suspension assemblies 40 in each set of secondary suspension sets are sequentially arranged at intervals in the forward direction of the sweeper, and the secondary suspension assemblies 40 in the two sets of secondary suspension sets are arranged in a one-to-one correspondence manner. In this alternative, this kind of the mode of laying of multiunit second grade suspension subassembly 40 for further evenly weaken the engine and transmit the vibration to sub vehicle frame, chassis and whole machine, thereby greatly improve the vibration isolation rate, and then effectively improve the life of other spare parts, for example because of the engine skew leads to the phenomenon such as single band overload, eccentric wear, jump area that the belt atress is uneven to bring, for example because of the too big phenomenon such as annex desolder, fracture that leads to of engine vibration, improvement customer experience that can be very big is felt, increases the reputation degree of product.

In this alternative, as shown in fig. 10, secondary suspension assembly 40 includes a secondary mount 41, a secondary leg 42, and a secondary cushion assembly 43 for reducing the transmission of vibrations. The secondary mount 41 is attached to the subframe. The secondary support leg 42 is inserted into the secondary mounting base 41, and the end portion thereof is connected to the secondary engine mounting bracket 30. The secondary cushion assemblies 43 are disposed between the secondary legs 42 and the corresponding secondary mounts 41. In this alternative, as shown in fig. 10, the secondary suspension assembly 40 is simple in construction, easy to manufacture, and easy to assemble and disassemble.

In this alternative, as shown in fig. 10, a second mounting through hole is formed in the second-stage mounting base 41, the second-stage mounting base 41 includes a second-stage cushion base 411 and a second-stage cushion upper cover 412, which are horizontally split along the center of the second mounting through hole, the second-stage cushion base 411 is detachably fixed to the sub-frame, and the second-stage cushion upper cover 412 is detachably fixed to the second-stage cushion base 411; in this alternative, the secondary mounting base 41 is configured to facilitate its manufacture, installation, and installation and positioning of the secondary cushion assembly 43. The secondary cushion assembly 43 is cylindrical and comprises a second limiting section and a second vibration damping section which are axially arranged, the outer diameter of the second limiting section is larger than that of the second vibration damping section, the second vibration damping section is arranged on the excircle of the secondary supporting leg 42 and is positioned in the second mounting through hole, and the second limiting section is clamped between the side end faces of the corresponding secondary engine mounting frame 30 and the secondary mounting seat 41; in this alternative, the secondary cushion assembly 43 is simple in structure and easy to install, position and fasten.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The utility model provides a suspension structure for motor is adorned on motor sweeper which characterized in that includes:

a first stage mount for vibration-damped mounting of the engine, and a second stage mount for reduced vibration transmission;

the first-stage suspension comprises two groups of front suspension assemblies (10) and two groups of rear suspension assemblies (20) which are sequentially arranged along the forward direction of the sweeper, the front suspension assemblies (10) and the rear suspension assemblies (20) are respectively arranged on an auxiliary engine mounting frame (30), the two groups of front suspension assemblies (10) are symmetrically arranged along the forward direction of the sweeper and along the center line of an auxiliary engine crankshaft and are used for being connected with the front fan end of the engine in a vibration damping mode respectively, and the two groups of rear suspension assemblies (20) are symmetrically arranged along the forward direction of the sweeper and along the center line of the auxiliary engine crankshaft and are used for being connected with the rear output end of the engine in a vibration damping mode respectively;

the second-stage suspension comprises multiple groups of second-stage suspension assemblies (40), and the multiple groups of second-stage suspension assemblies (40) are respectively arranged between the auxiliary engine mounting frame (30) and the auxiliary frame so as to reduce vibration transmission between the auxiliary engine mounting frame (30) and the auxiliary frame.

2. The suspension structure for a motor sweeper truck according to claim 1,

the rear suspension assembly (20) comprises two rear suspension mounting seats (21) arranged at intervals along the forward direction of the sweeper, rear suspension support legs (22) rotatably arranged between the two rear suspension mounting seats (21), and a rear suspension cushion assembly (23) arranged between the rear suspension support legs (22) and the corresponding rear suspension mounting seats (21);

the rear overhang mounting base (21) is connected with the auxiliary engine mounting frame (30);

two rear suspension legs (22) of the two groups of rear suspension assemblies (20) are respectively biased to form an acute angle towards a vertical central plane of a secondary engine crankshaft of the sweeper, so that the engine is obliquely supported by the deflected vertical plane.

3. The suspension structure for a motor sweeper truck according to claim 2,

a first mounting through hole is formed in the rear suspension mounting seat (21);

the rear suspension leg (22) comprises a mounting head (221) connected with the engine, a mounting shaft (222) connected with the mounting head (221), and two limiting steps (223) sequentially arranged on the excircle of the mounting shaft (222) at intervals;

the mounting shafts (222) penetrate through the first mounting through holes on the corresponding sides, and the limiting steps (223) are positioned between the two rear suspension mounting bases (21);

the rear suspension cushion assembly (23) is sleeved on the excircle of the mounting shaft (222), and the end part of the rear suspension cushion assembly is clamped between the limiting step (223) and the side end face of the rear suspension mounting seat (21).

4. The suspension structure for a motor sweeper truck according to claim 3,

the rear suspension cushion assembly (23) is cylindrical and comprises a first limiting section and a first vibration damping section which are arranged along the axial direction, and the outer diameter of the first limiting section is larger than that of the first vibration damping section;

the first vibration reduction section is arranged on the excircle of the first mounting shaft (222) and is positioned in the first mounting through hole;

the first limiting section is clamped between the corresponding limiting step (223) and the side end face of the rear overhang mounting seat (21).

5. The suspension structure for a motor sweeper truck according to claim 3,

the rear suspension mounting seat (21) comprises a rear suspension cushion base (211) and a rear suspension cushion upper cover (212), wherein the rear suspension cushion base (211) and the rear suspension cushion upper cover are horizontally split along the center of the first mounting through hole;

the rear suspension cushion base (211) is detachably fixed with the auxiliary engine mounting frame (30);

the upper cover (212) of the rear suspension cushion and the base (211) of the rear suspension cushion are detachably fixed.

6. The suspension structure for a motor sweeper truck according to claim 1,

the front suspension assembly (10) comprises a front suspension leg (11) connected with the auxiliary engine mounting bracket (30), and a front suspension cushion (12) connected to the front suspension leg (11);

two front suspension legs (11) of the two groups of front suspension assemblies (10) are respectively biased to form an acute angle towards a vertical central plane of a secondary engine crankshaft of the sweeper, so that the engine is obliquely supported by the deflected vertical plane.

7. The suspension structure for a motor sweeper truck according to claim 6,

the front suspension leg (11) comprises a vertical support which is vertically arranged and detachably fixed with the auxiliary engine mounting rack (30), and a mounting plate which is obliquely fixed at the top end of the vertical support, wherein a positioning hole penetrating through the mounting plate is formed in the mounting plate;

the front suspension cushion (12) comprises a square body, and a connecting rod and a connecting column which are connected to two opposite ends of the square body, the connecting column penetrates through the positioning hole and then is fastened through a nut so as to be detachably fixed with the mounting plate, and the connecting rod is detachably fixed with the engine.

8. The suspension structure for a motor sweeper truck according to claim 1,

multiunit second grade suspension subassembly (40) are equallyd divide for following two sets of second grade suspension groups that the width direction of motor sweeper set up relatively, every group multiunit in the second grade suspension group second grade suspension subassembly (40) set up along the antecedent direction interval in proper order of motor sweeper, and two sets of in the second grade suspension group second grade suspension subassembly (40) one-to-one sets up.

9. The suspension structure for a motor sweeper truck according to claim 8,

the secondary suspension component (40) comprises a secondary mounting seat (41), a secondary supporting leg (42) and a secondary cushion assembly (43) for reducing vibration transmission;

the secondary mounting seat (41) is connected to the auxiliary frame;

the secondary supporting leg (42) is arranged in the secondary mounting seat (41) in a penetrating mode, and the end portion of the secondary supporting leg is connected with the auxiliary engine mounting frame (30);

the secondary cushion assemblies (43) are arranged between the secondary support legs (42) and the corresponding secondary mounting seats (41).

10. The suspension structure for a motor sweeper truck according to claim 9,

a second mounting through hole is formed in the second-stage mounting seat (41), the second-stage mounting seat (41) comprises a second-stage cushion base (411) and a second-stage cushion upper cover (412), the second-stage cushion base (411) and the auxiliary frame are arranged in a horizontal split mode along the center of the second mounting through hole, the second-stage cushion base is detachably fixed to the auxiliary frame, and the second-stage cushion upper cover (412) and the second-stage cushion base (411) are detachably fixed to each other;

second grade cushion assembly (43) are the tube-shape, include along the spacing section of second and the second damping section of axial setting, just the external diameter of the spacing section of second is greater than the external diameter of second damping section, the second damping section install in on the excircle of second grade landing leg (42), and be located in the second installation through-hole, the spacing section chucking of second in corresponding vice engine mounting bracket (30) with between the side end face of second grade mount pad (41).

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