Engine front suspension device, assembling method thereof and commercial vehicle

Abstract

The invention discloses an engine front suspension device, an assembling method thereof and a commercial vehicle. The device comprises a bracket, a soft cushion and a central mounting bolt, the support is provided with a threaded hole with the axis in the horizontal direction. And the cushion is provided with a horizontal through mounting hole which is coaxial with the threaded hole. The center installation bolt sequentially penetrates through an assembly process hole preset in the frame girder and the through installation hole of the cushion in the horizontal direction and is in threaded connection with the threaded hole of the support, and the support and the cushion are fastened into a whole. The traditional vertical arrangement of the central mounting bolt is changed into horizontal through arrangement, and the assembly operation is transferred from the inner side of the girder with a narrow space to the outer side, so that the problem of insufficient assembly space is solved, and the assembly efficiency is improved; the stress direction of the bolt is perpendicular to the main dynamic load direction of up-and-down jumping of the engine, so that the loosening and fracture risks caused by the fact that the bolt bears alternating dynamic loads are avoided, the reliability of the suspension device is improved, and the service life of the suspension device is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of commercial vehicle powertrain, in particular to an engine front suspension device, an assembling method thereof and a commercial vehicle. BACKGROUND

[0002] The medium and heavy commercial vehicle has two parallel frame girders, and the engine powertrain is installed between the girders. The engine front suspension is a key component of the powertrain suspension system, which is composed of a bracket and a soft pad (or a bracket), and serves to support the weight of the engine and isolate vibration. The conventional installation method is that the soft pad (or bracket) is fixed to the inner side web of the frame girder by bolts, the bracket is fixed to the engine cylinder, and then a center long bolt is connected and fastened.

[0003] To achieve good vibration isolation, the suspension system is close to the engine body and is installed in the narrow gap between the engine and the girder. There are two schemes in the prior art: scheme one adopts an inclined structure, the center installation bolt is on the inner side of the girder, and the tightening tool is inserted from the bottom of the girder for operation during assembly; scheme two adopts a horizontal structure, the center installation bolt is also on the inner side of the girder, and the tightening tool is inserted from the top of the girder for operation during assembly. These schemes have objective defects: first, strict environmental regulations make the engine displacement and volume increase, integrated accessories increase, the available space between the engine and the frame girder is compressed, the suspension arrangement and assembly space is narrow, and the operator has difficulty in inserting the tightening tool and effectively applying torque, which affects the assembly rhythm and reduces production efficiency; second, the increase of engine displacement and volume increases the weight, in the traditional vertical arrangement, the dynamic load borne by the center installation bolt becomes larger, and in tests and actual use, the center installation bolt frequently loosens or even breaks, and the breakage of the center installation bolt may cause the engine to sink, interfere or even fall off, which poses a serious safety hazard. In summary, the existing suspension device has the technical problems of narrow assembly space, low efficiency, poor reliability of the center installation bolt, and easy loosening and breakage. SUMMARY

[0004] The present application aims to overcome the above technical deficiencies and provide an engine front suspension device, an assembling method thereof and a commercial vehicle, which solve the technical problems of narrow assembly space, low efficiency, poor reliability of the center installation bolt, and easy loosening and breakage in the prior art.

[0005] To achieve the above technical purposes, the present application adopts the following technical solutions: In a first aspect, the present application provides an engine front suspension device for connecting an engine to a frame girder of a commercial vehicle, comprising: a bracket having an engine connecting portion and a bracket matching portion connected to each other, the bracket matching portion being provided with a threaded hole, the axis of the threaded hole being horizontally oriented, and the engine connecting portion being connected to the engine; The cushion has mutually connected beam connecting portions and cushion fitting portions, the cushion fitting portions are fitted with the support fitting portions, the cushion fitting portions are provided with through installation holes, and the through installation holes are coaxially arranged with the threaded holes. A center installation bolt is sequentially arranged through the vehicle frame beam, the through installation hole of the cushion, and is threadedly connected with the threaded hole of the support.

[0006] In some embodiments of the present application, the support fitting portion of the support has a side plane and an upper plane, the side plane is perpendicular to the upper plane, and the threaded hole is arranged on the side plane.

[0007] In some embodiments of the present application, the engine connecting portion of the support includes at least two claw-shaped structures, the claw-shaped structures are connected with the side plane and extend downwardly, and each claw-shaped structure is provided with at least two installation holes.

[0008] In some embodiments of the present application, the cushion includes an inner framework, a rubber assembly, and a bracket, the rubber assembly is wrapped outside the inner framework, the bracket is arranged on one side of the inner framework and the rubber assembly and is connected to the vehicle frame beam, and the through installation hole is arranged on the inner framework.

[0009] In some embodiments of the present application, the inner framework has a trapezoidal structure, the trapezoidal structure matches the side plane and the upper plane of the support, the trapezoidal structure includes an upper base and a front end face, the upper base is fitted with the upper plane, the front end face is fitted with the side plane, and the through installation hole penetrates the front end face and a rear end face opposite to the front end face.

[0010] In some embodiments of the present application, the bracket is provided with a special-shaped notch away from the middle part of the side surface of the inner framework, and the special-shaped notch is opposite to the rear end face of the inner framework.

[0011] In some embodiments of the present application, the bracket is provided with a clamping groove on both sides, and the rubber assembly is integrally formed with a baffle on both sides, and the baffle is connected with the clamping groove.

[0012] In some embodiments of the present application, the support is a cast iron or cast steel piece, and the inner framework and the bracket are stamped steel plate pieces.

[0013] In a second aspect, the application further provides a commercial vehicle, comprising a frame sill, an engine, and the engine front suspension device according to any one of the embodiments of the first aspect, wherein an assembly process hole is formed in the frame sill, the position of the assembly process hole corresponds to the position of the through mounting hole of the soft pad, the center mounting bolt passes through the assembly process hole, the through mounting hole and the threaded hole of the bracket in sequence and is threadedly connected with the bracket, and the engine is connected with the bracket.

[0014] In a third aspect, the application further provides an assembly method of an engine front suspension device, which is suitable for the engine front suspension device according to any one of the embodiments of the first aspect, and comprises the following steps: mounting the soft pad to the inner side of the frame sill; mounting the bracket to the engine; hoisting the engine to the frame, so that the bracket matching part of the bracket is aligned with the soft pad matching part of the soft pad; from the outer side of the frame sill, the center mounting bolt passes through the assembly process hole and the through mounting hole, and is tightened in the threaded hole.

[0015] Compared with the prior art, the technical scheme provided by the application has the beneficial technical effects including: The bracket and the soft pad of the suspension device are structurally optimized, and an assembly process hole is formed in the frame sill, so that the arrangement direction of the center mounting bolt is revolutionarily changed from the traditional vertical direction to the horizontal direction. During assembly, the operator can directly use a standard tool from the outer side of the frame sill to tighten the center mounting bolt, which completely releases the assembly space, is convenient to operate, and greatly improves the assembly efficiency of the production line. More importantly, in this structure, the axis of the center mounting bolt is perpendicular to the main dynamic load direction of the up-down movement of the engine, the bolt no longer directly bears the tensile-compressive alternating load that causes fatigue, and only plays a fastening connection role, thereby fundamentally solving the reliability risk of bolt loosening and breaking in the prior art, and significantly improving the safety and durability of the vehicle. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical scheme in the application, the drawings needed in the embodiments will be briefly introduced as follows: Figure 1 is a front installation schematic diagram of an engine front suspension device in the embodiments of the application; Figure 2 is a back installation schematic diagram of an engine front suspension device in the embodiments of the application; Figure 3 is a front structure schematic diagram of a soft pad in the embodiments of the application; Figure 4is a schematic view of a back surface structure of a soft pad in an embodiment of the present application. Figure 5 is a schematic view of a structure of a bracket in an embodiment of the present application.

[0017] Reference signs: 1-bracket; 10-threaded hole; 11-side plane; 12-upper plane; 13-claw structure; 2-soft pad; 20-inner framework; 200-through mounting hole; 201-front end surface; 202-upper bottom surface; 203-rear end surface; 21-rubber assembly; 210-baffle; 22-carrier; 220-clamping slot; 221-irregular notch; 3-center mounting bolt. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0019] Those skilled in the art can understand that, in the present specification, the word "comprising" is an open-ended expression, which means that the features are present but other features are not excluded. The terms "upper", "lower", "left", "right", etc. are the example directions based on the drawings. The features with "first" and "second" are implicitly included one or more of the features. The singular form expressions can also be used for the plural form. The meaning of "a plurality of" is two or more. The terms "mounting", "connecting", "connection" can be fixed connection, detachable connection or integral connection; can be direct connection or indirect connection through intermediate medium; can be the communication inside two elements. In addition, "connection" can include wireless connection.

[0020] The purpose of the present application is to overcome the above technical deficiencies, propose an engine front suspension device and its assembly method, and a commercial vehicle, to solve the technical problems of narrow assembly space, low efficiency, poor reliability of center mounting bolt and easy loosening and fracture in the prior art.

[0021] To achieve the above technical purpose, the present application adopts the following technical solutions: Reference Figures 1 to 5 The present embodiment provides an engine front suspension device for a medium and heavy commercial vehicle, which is used to connect the engine to the frame girder of the commercial vehicle. The device comprises a bracket 1, a soft pad 2 and a center mounting bolt 3.

[0022] The bracket 1 has an engine connecting part for connecting with the engine, and a bracket matching part for matching with the cushion 2. A threaded hole 10 is arranged on the bracket matching part, and the axis of the threaded hole 10 is horizontally arranged. The cushion 2 has a beam connecting part for connecting with the beam of the vehicle frame, and a cushion matching part for matching with the bracket matching part of the bracket 1. A through mounting hole 200 is arranged on the cushion matching part, and the axis of the through mounting hole 200 is also horizontally arranged and coaxially arranged with the threaded hole 10 of the bracket 1.

[0023] During the assembly of the whole vehicle, the center mounting bolt 3 is sequentially arranged in the horizontal direction through the assembly process hole prearranged on the beam of the vehicle frame, the through mounting hole 200 of the cushion 2, and finally is threadedly connected with the threaded hole 10 of the bracket 1, so that the bracket 1 and the cushion 2 are fastened as a whole.

[0024] Working principle: in the design of the present application, the transmission path of the weight of the engine and the vertical dynamic load is: engine-bracket 1-cushion 2-beam of the vehicle frame. Among them, the vertical force is mainly transmitted and buffered by the contact surface between the bracket matching part of the bracket 1 and the cushion matching part of the cushion 2. The center mounting bolt 3 arranged horizontally, and the axis direction is basically perpendicular to the above-mentioned vertical load direction. Therefore, the main function of the bolt 3 is to provide strong pre-tightening force to firmly “clamp” the bracket 1 and the cushion 2 together to prevent lateral relative displacement between them, and it does not directly bear the main tensile-compressive alternating load generated by the up-down jumping of the engine. During assembly, the worker can directly tighten the center mounting bolt 3 on the outside of the beam of the vehicle frame by using an electric or pneumatic wrench, and the operation space is wide and there is no interference.

[0025] By changing the vertical arrangement of the center mounting bolt to the horizontal through arrangement, and transferring the assembly operation from the narrow space inside the beam to the outside, the problem of insufficient assembly space is fundamentally solved, and the assembly efficiency is significantly improved. At the same time, the stress direction of the bolt is perpendicular to the main dynamic load direction of the up-down jumping of the engine, which avoids the risk of loosening and breaking of the bolt due to bearing alternating dynamic load, and greatly enhances the reliability and service life of the suspension device.

[0026] The bracket matching part of the bracket 1 is preferably an L-shaped structure, which includes a side plane 11 and an upper plane 12 perpendicular to the side plane 11. The threaded hole 10 is arranged on the side plane 11.

[0027] The bracket matching part adopts an L-shaped structure, which provides two mutually perpendicular contact and support planes between the bracket 1 and the cushion 2, can effectively resist forces from different directions, ensures the rigidity of the connection and the accuracy of the positioning, and prevents relative rotation between them.

[0028] The engine connecting part of the bracket 1 is designed as a claw-shaped structure 13 with high connecting stiffness. Specifically, the engine connecting part comprises at least two claw-shaped structures 13 connected with the side plane 11 and extending obliquely downward. At least two mounting holes are provided on each claw-shaped structure 13 for connecting with the cylinder side wall or flywheel housing of the engine through high-strength bolts.

[0029] The claw-shaped structure provides a wide-based, multi-point stable connection, which can more evenly transmit the weight and torque of the engine to the suspension device, improving the reliability and carrying capacity of the connection.

[0030] The internal structure of the soft pad 2 specifically comprises an inner framework 20, a rubber assembly 21, and a bracket 22. The rubber assembly 21 is wrapped around the outer circle of the inner framework 20 through a vulcanization process. The bracket 22 covers one side (i.e., the side close to the girder) of the inner framework 20 and the rubber assembly 21 and is connected with the frame girder through mounting holes thereon. The through mounting hole 200 is provided on the inner framework 20.

[0031] The structure and function of the soft pad are clearly divided, the inner framework 20 is responsible for bearing and positioning, the rubber assembly 21 is responsible for vibration isolation and buffering, and the bracket 22 is responsible for mounting and connecting with the frame, and each component works cooperatively to achieve excellent bearing and vibration isolation performance.

[0032] The inner framework 20 has a trapezoidal structure matching the L-shaped bracket matching part of the bracket 1. The trapezoidal structure comprises an upper bottom surface 202 and a front end surface 201. After assembly, the upper bottom surface 202 of the inner framework 20 is fitted with the upper plane 12 of the bracket 1 to jointly bear the vertical load of the engine, and the front end surface 201 of the inner framework 20 is fitted with the side plane 11 of the bracket 1. The through mounting hole 200 penetrates the front end surface 201 and the rear end surface 203 opposite to the front end surface 201.

[0033] The L-shaped structure of the bracket and the trapezoidal structure of the inner framework form a "clamping" or "nesting" type matching, achieving face contact in both vertical and horizontal directions, effectively preventing relative rotation and misalignment between the bracket and the soft pad, and further improving the stability and reliability of the entire suspension device connection.

[0034] In order to provide a passage for the center mounting bolt 3, the bracket 22 is provided with a special-shaped notch 221 at the middle part of the side surface (i.e., the back surface) away from the inner framework 20. The special-shaped notch 221 is located opposite to the rear end surface 203 of the inner framework 20 and has a size sufficient for the head or sleeve tool of the center mounting bolt 3 to pass through.

[0035] The design of the special-shaped notch is one of the key structures for realizing the horizontal through type assembly scheme of the application, which opens an interference-free path for the horizontally mounted center mounting bolt under the premise of ensuring the mounting strength and rigidity of the bracket, and is ingenious and practical.

[0036] In order to ensure the stable connection between the rubber assembly 21 and the bracket 22, the two side edges of the bracket 22 are bent inward to form a clamping groove 220. Correspondingly, the two sides of the rubber assembly 21 are integrally formed with a baffle 210 which is positioned and connected with the clamping groove 220 after vulcanization or assembly.

[0037] The matching structure of the clamping groove and the baffle provides reliable circumferential and axial positioning between the rubber assembly and the bracket, effectively prevents the rubber assembly from being pulled out or abnormally displaced under complex working conditions such as engine torsion or longitudinal acceleration and deceleration, and ensures the long-term stable work of the suspension.

[0038] From the consideration of material selection and manufacturing cost, the bracket 1 is preferably a cast iron or cast steel piece with high strength and easy to form. The inner frame 20 and the bracket 22 are preferably stamped steel plate pieces with low cost and easy to stamp.

[0039] The use of appropriate materials and manufacturing processes makes each component meet the performance requirements of high strength and high rigidity, while taking into account the manufacturing cost, and realizes the optimal economic and technical nature.

[0040] The application also provides a commercial vehicle, which comprises a frame beam, an engine and the engine front suspension device according to any one of the embodiments of the first aspect. On the frame beam of the commercial vehicle, an assembly process hole is pre-stamped or drilled at a position corresponding to the outside of the through mounting hole 200 of the soft pad 2. During assembly, the center mounting bolt 3 passes through the assembly process hole, the through mounting hole 200 of the soft pad 2 in sequence, and is finally screwed with the threaded hole 10 of the bracket 1, and the engine is fixedly connected with the engine connecting part of the bracket 1.

[0041] The pre-set assembly process hole on the frame is a necessary condition for the suspension device of the application to realize its convenient assembly advantage, which embodies the collaborative design concept of suspension parts and vehicle frame, so that the entire assembly scheme can be perfectly implemented.

[0042] The application also provides an assembly method of an engine front suspension device, which is suitable for assembling the engine front suspension device according to any one of the embodiments of the first aspect, and specifically comprises the following steps: S1. The soft pad 2 is pre-tightened or finally fastened on the inner side web plate of the frame beam through the mounting hole on the bracket 22 thereof by means of a bolt; S2. Before the engine is hoisted, the bracket 1 is fastened to the engine cylinder through the mounting hole on the claw-shaped structure 13 by bolts; S3. The engine with the installed bracket 1 is hoisted to the vehicle frame, and the position is adjusted so that the L-shaped bracket fitting part of the bracket 1 is aligned and attached to the trapezoidal cushion fitting part of the cushion 2; S4. The operator stands outside the vehicle frame girder, passes the center mounting bolt 3 through the pre-set assembly process hole and the through mounting hole 200 of the cushion 2 from the outside of the girder, and tightens it in the threaded hole 10 of the bracket 1 using a tightening tool to reach the specified torque.

[0043] The assembly method has clear flow and smooth logic, especially the final tightening step, the operation space is completely open, special or extended tools are not needed, and the assembly process is significantly simplified, the assembly time of a single vehicle is shortened, and the production line rhythm is improved.

[0044] In another embodiment, in order to further improve the assembly accuracy of the power assembly, at least one detachable adjusting washer can be arranged between the side plane 11 of the bracket 1 and the front end face 201 of the inner skeleton 20 of the cushion 2. The adjusting washer can be a group of U-shaped stainless steel washers with different thickness specifications (for example, 0.5mm, 1.0mm, 2.0mm). After the power assembly is initially positioned on the assembly line, the transverse offset between the engine output end and the transmission system input end can be measured by a laser centering instrument, a washer with a corresponding thickness is selected according to the measurement value, and the washer is then sleeved on the center mounting bolt 3 before the bolt is tightened.

[0045] The transverse position of the power assembly can be accurately fine-tuned during assembly to compensate for the manufacturing and assembly tolerances of the vehicle frame and the engine, to ensure the centering accuracy of the transmission system, and to reduce the vehicle vibration and abnormal wear of the transmission components.

[0046] In another embodiment, in order to provide a failsafe function, the upper plane 12 of the bracket 1 can be extended upward to form a limiting protrusion (such as an arc-shaped hook), and the bracket 22 of the cushion 2 can be extended upward at the corresponding position to form a limiting recess (such as a U-shaped groove). In the normal working state, there is a pre-set vertical gap (such as 8mm±2mm) between the limiting protrusion and the limiting recess.

[0047] A mechanical failsafe function is provided. When the rubber assembly 21 is completely failed due to aging or accidental tearing, the limiting structure can accommodate the sunken engine to prevent it from sinking excessively or colliding with other components (such as the steering tie rod) of the chassis, thereby ensuring the safety of driving in emergency situations.

[0048] In another embodiment, in order to obtain better vibration isolation performance, the soft pad 2 can be designed as a hydraulic soft pad. The rubber assembly 21 inside is provided with a main liquid chamber and a secondary liquid chamber connected through a throttling channel and / or an inertial channel, and the liquid chambers are filled with special damping liquid (such as ethylene glycol aqueous solution).

[0049] By introducing hydraulic damping, the suspension device has frequency selectivity, can provide high damping for low-frequency large-amplitude vibration such as engine idle vibration, and presents low stiffness to high-frequency micro-vibration from the road, so as to achieve better vibration isolation effect in the whole working condition range and significantly improve the riding comfort.

[0050] In another embodiment, especially for vehicle models with high engine compartment temperature, a heat shield can be integrally formed or detachably mounted on the bracket 22 or the support 1. The heat shield is located between the rubber assembly 21 part of the soft pad 2 and the high-temperature heat source such as the exhaust manifold or the turbocharger of the engine.

[0051] The heat shield effectively blocks the strong heat radiation of the high-temperature components of the engine to the suspension rubber assembly, significantly reduces the working temperature of the rubber, delays the thermal aging process, and prolongs the service life of the suspension device, especially for heavy commercial vehicles meeting the Euro 6 and above emission standards with complex aftertreatment systems and higher engine compartment temperature.

[0052] Compared with the prior art, the technical scheme provided by the application has the beneficial technical effects including: Through the innovative horizontal through bolt connection structure, not only the long-standing problems of assembly efficiency and bolt reliability in the industry are fundamentally solved, but also through further optimization and extension design, higher assembly precision, failure safety, riding comfort and use durability are provided, which has very high practical value and popularization prospect.

[0053] Those skilled in the art in this technical field can understand that the steps, measures and schemes in various operations, methods and processes discussed in the application can be alternated, changed, rearranged, decomposed, combined or deleted.

[0054] The specific embodiments of the application described above do not constitute a limitation on the protection scope of the application. Any various other corresponding changes and modifications made according to the technical concept of the application should be included in the protection scope of the claims of the application.

Claims

1. An engine front suspension device for connecting an engine to a frame rail of a commercial vehicle, characterized in that, include: The bracket has an engine connection part and a bracket mating part that are connected to each other. The bracket mating part is provided with a threaded hole, the axis of which is horizontal. The engine connection part is connected to the engine. The pad has a beam connecting part and a pad mating part that are connected to each other. The pad mating part mates with the bracket mating part. The pad mating part is provided with a through mounting hole. The through mounting hole is coaxially arranged with the threaded hole. The center mounting bolt passes through the through mounting holes of the frame beam and the pad in sequence along the horizontal direction, and is threadedly connected to the threaded hole of the bracket.

2. The engine front suspension device according to claim 1, characterized by The bracket mating part of the bracket has a side plane and a top plane, the side plane is perpendicular to the top plane and the threaded hole is provided on the side plane.

3. The engine front suspension arrangement of claim 2, wherein The engine connection portion of the bracket includes at least two claw-shaped structures, which are connected to the side plane and extend obliquely downwards, and each claw-shaped structure is provided with at least two mounting holes.

4. The engine front suspension device of claim 1, wherein The padding includes an inner frame, a rubber assembly, and a bracket. The rubber assembly wraps around the outer ring of the inner frame. The bracket is located on one side of the inner frame and the rubber assembly and is connected to the frame beam. The through mounting hole is located on the inner frame.

5. The engine front suspension arrangement of claim 4, wherein The inner frame has a trapezoidal structure that matches the side plane and top plane of the bracket. The trapezoidal structure includes an upper bottom surface and a front end surface. The upper bottom surface fits into the top plane, and the front end surface fits into the side plane. The through mounting hole passes through the front end surface and the rear end surface opposite to the front end surface.

6. The engine front suspension arrangement of claim 5, wherein The bracket has an irregularly shaped notch in the middle of the side surface away from the inner frame, and the irregularly shaped notch is directly opposite the rear end face of the inner frame.

7. The engine front suspension arrangement of claim 4, wherein The bracket has slots on both sides, and the rubber assembly has baffles integrally formed on both sides, with the baffles connected to the slots.

8. The engine front suspension arrangement of claim 4, wherein The support frame is made of cast iron or cast steel, and the inner frame and the bracket are made of stamped steel plates.

9. A commercial vehicle characterized in that The system includes a frame beam, an engine, and an engine front mount as described in any one of claims 1-8. The frame beam has an assembly process hole, the position of which corresponds to the position of the through mounting hole of the pad. A center mounting bolt passes through the assembly process hole and the through mounting hole in sequence and is threadedly connected to the threaded hole of the bracket. The engine is connected to the bracket.

10. A method of assembling an engine front suspension arrangement, characterized by An engine front mount device as described in any one of claims 1-8, comprising the following steps: Install the padding onto the inside of the frame beam; Install the bracket onto the engine; The engine is hoisted onto the frame, aligning the bracket mating part of the bracket with the padding mating part of the padding. From the outside of the frame beam, pass the center mounting bolt through the assembly process hole and the through mounting hole, and tighten it in the threaded hole.

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