CN215374503U - Auxiliary testing tool for double-mass flywheel - Google Patents

Abstract

The utility model relates to a test auxiliary tool of a dual mass flywheel, the dual mass flywheel comprises a first mass and a second mass, and is characterized in that the test auxiliary tool is provided with an operation part, an engagement part and a positioning part, the operation part is configured to be used for operating the test auxiliary tool by an operator, the engagement part is configured to be used for attaching the test auxiliary tool to the dual mass flywheel, the positioning part is configured to be inserted into a corresponding hole on a crankshaft of an engine so as to position the test auxiliary tool relative to the engine, the engagement part is provided with at least one engagement claw which is configured to be interlocked with the movement of the operation part and an opposite part which is cooperated with the engagement claw, and the engagement claw and the opposite part are configured to releasably engage the test auxiliary tool to the second mass of the dual mass flywheel. The simple structure of this test auxiliary fixtures is light and handy, can avoid producing radial centrifugal force when dual mass flywheel is rotatory during the test to and avoid the test auxiliary fixtures to throw away from dual mass flywheel.

Description

Auxiliary testing tool for double-mass flywheel

Technical Field

The utility model relates to a test auxiliary tool for a dual-mass flywheel. In particular, the utility model relates to a cold test tool for a dual-mass flywheel.

Background

The dual-mass flywheel is a component widely applied to an automobile transmission system (particularly, an engine), and has the advantages of transmitting the rotation torque of the engine, effectively attenuating the vibration of the power transmission system, reducing the low-order natural frequency of the power transmission system, prolonging the service life of related components in the power transmission system, improving the riding comfort of the automobile and the like. In short, the dual mass flywheel divides a single mass flywheel into two parts, one part of the dual mass flywheel is reserved on one side of the existing engine and plays the role of the original flywheel for starting and transmitting the rotating torque of the engine, and the part is called as a first mass; the other part is arranged on one side of the transmission of the prior system and is used for improving the rotational inertia of the transmission, and the part is called as a second mass.

Before each engine leaves the factory, the performance of each engine needs to be tested. There are two commonly used test methods, i.e., cold test and hot test. The "hot test" generally refers to a test performed in an ignition operation state such as an external cooling cycle of an engine and fuel supply, and is a test performed in a real-time driving state of the engine. The "cold test" refers to a test performed in a state where the engine is driven by the electric motor and the operation of the engine is simulated. Compared with the traditional hot test, the cold test has the following advantages: firstly, in the aspect of quality control, the cold test has high precision, comprehensive test and early fault discovery; secondly, in the aspect of economy, the number of testers for cold test is relatively reduced, fuel oil is not consumed, and a ventilation and test tail gas and wastewater treatment and discharge system is omitted; thirdly, in the aspect of environmental protection, the test process of cold test has no combustion noise, no tail gas emission and clean working environment; fourth, in terms of efficiency, the cold test is measured by a special cold test bench, and the beat is fast.

In the process of testing the performance of the engine, no matter whether the engine is in a hot test or a cold test, only the first mass of the dual-mass flywheel is mounted on a crankshaft of the engine, but the second mass cannot be fixed, so that the second mass may sink due to gravity and the like, the second mass may swing radially, the dual-mass flywheel may be damaged, and the like, and the cold test vibration test result may be influenced by abnormal motion of the second mass of the flywheel.

In order to solve the problems, some test auxiliary tools aiming at the dual-mass flywheel are developed at present. However, these conventional test assistance tools have the following disadvantages. Firstly, these test auxiliary fixtures are mainly researched and developed to hot test operating mode, and see very little dual mass flywheel test auxiliary fixtures to cold test operating mode. However, as described above, cold testing is preferable from the viewpoint of mass production, stable product performance, cost saving, and environmental protection. Therefore, a dual-mass flywheel test auxiliary tool for cold test working conditions is needed. Secondly, even if the existing dual-mass flywheel hot test tools are modified to a certain extent and then applied to cold test conditions, the hot test tools are inconvenient to operate, a plurality of bolts need to be screwed manually to fix the test auxiliary tools, and the bolts need to be unscrewed to dismount the test auxiliary tools after the test is completed.

SUMMERY OF THE UTILITY MODEL

In order to overcome at least one of the above disadvantages in the prior art, the present invention provides a test aid for a dual mass flywheel including a first mass fixed to a crankshaft of an engine at the time of testing, and a second mass connected to the first mass and provided with a spline hole but not fixed, characterized in that the test aid is provided with an operating portion configured to operate the test aid by an operator, an engaging portion configured to attach the test aid to the dual mass flywheel through the spline hole of the second mass, and a positioning portion configured to be inserted into a corresponding hole on the crankshaft of the engine so as to position the test aid with respect to the engine. The engaging portion is provided with at least one engaging claw configured to be interlocked with movement of the operating portion, the engaging claw being releasably engageable with the second mass of the dual mass flywheel. Preferably, the engagement claw cooperates with an opposing portion provided on the engagement portion to releasably engage the test aid to the second mass of the dual mass flywheel. The test auxiliary tool is simple and light in structure, and can avoid the influence on a vibration test result caused by radial centrifugal force generated when the dual-mass flywheel rotates in the test period and avoid the test auxiliary tool from being thrown out of the dual-mass flywheel.

According to a preferred embodiment, the operating portion includes a handle, a first cylindrical portion connected to the handle, a contact operating portion configured to contact and operate the engaging claw of the engaging portion, and a second cylindrical portion extending through the engaging portion and the positioning portion.

According to a preferred embodiment, the contact operating portion includes, in order in a direction from the first cylindrical portion toward the second cylindrical portion, a cylindrical section and a tapered section having an outer diameter larger than that of the cylindrical section.

According to a preferred embodiment, the engaging portion includes a first cylindrical portion and a second cylindrical portion, the first cylindrical portion having an outer diameter close to but smaller than an inner diameter of a splined bore of the second mass of the dual mass flywheel for insertion into the splined bore; the second cylindrical portion has an outer diameter larger than an inner diameter of the spline hole of the second mass, and a shoulder is formed between the first cylindrical portion and the second cylindrical portion, the shoulder forming the aforementioned opposing portion that cooperates with the engaging pawl. When the test aid is attached to the dual mass flywheel, the shoulder will abut on one side surface of the second mass.

According to a preferred embodiment, at least one recess is further provided on the outer surface of the first cylindrical portion for accommodating an engagement claw pivotally secured to the second cylindrical portion by means of a pivot pin.

According to a preferred embodiment, the engagement pawl is provided with a projecting hook portion, between which hook portion and a shoulder of the engagement portion an engagement recess is formed for engagement with the second mass of the dual mass flywheel, the axial length of the engagement recess being equal to the thickness of the second mass of the dual mass flywheel.

According to a preferred embodiment, a portion of the end of the engaging claw, which is in contact with the contact operating portion, is configured as a rounded portion. Due to the shape of both the rounded portion at the lower right side of the engaging pawl and the tapered section of the contact operating portion, the tapered section of the contact operating portion will smoothly move over the rounded portion of the engaging pawl while pushing the engaging pawl upward to rotate clockwise about the pivot pin.

According to a preferred embodiment, an end cover plate for preventing the contact operation portion from coming out of the second cylindrical portion is attached at an end of the second cylindrical portion, and a biasing means for applying a biasing force to the engaging claw may be further interposed between the end cover plate and the engaging claw.

According to a preferred embodiment, the test aid is provided with three engagement jaws. The three engagement claws can ensure that the test aid is firmly attached to the dual mass flywheel.

According to a preferred embodiment, the test auxiliary tool is used as a cold test tool for the dual-mass flywheel under the condition that an external motor is adopted to drive an engine for testing. Compared with a hot test tool, the cold test tool is preferable in terms of mass production, stable product performance, cost saving and environmental protection.

Further features of the utility model will become apparent from the following description of exemplary embodiments with reference to the attached drawings.

Drawings

The present invention will now be described in detail hereinafter with reference to the accompanying drawings. It is understood that the drawings are not necessarily to scale and that the drawings are merely illustrative of exemplary embodiments of the utility model and are not to be considered limiting of its scope. Wherein:

FIG. 1 is a perspective view schematically illustrating an exemplary dual mass flywheel 10;

FIG. 2 is a cross-sectional view schematically illustrating the dual mass flywheel 10;

fig. 3 schematically shows a dual mass flywheel 10 mounted to the crankshaft 2 of the engine 1;

fig. 4 is a perspective view schematically showing a test assist tool 100 for the dual mass flywheel 10 according to an exemplary embodiment of the present invention;

fig. 5 is a sectional view schematically showing a state where the test assist tool 100 is not inserted into the dual mass flywheel 10 or is just inserted into the dual mass flywheel 10 but is not yet fixed in place;

fig. 6 is a perspective view schematically showing a state where the test assist tool 100 has been inserted into the dual mass flywheel 10 and has been fixed in position; and

fig. 7 schematically shows the test aid 100 having been inserted into the dual mass flywheel 10 and having been secured in place.

Detailed Description

Exemplary embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It is to be understood that the description of the various embodiments is illustrative only and is not intended to limit the technology of the present invention in any way. It is also to be understood that the embodiments disclosed herein can be combined in various ways to provide further additional embodiments.

It should be understood that like reference numerals refer to like elements throughout the several views. In the drawings, the dimensions of some of the elements may be modified, exaggerated or reduced for clarity; or some components may be omitted or shown in somewhat schematic form in order to highlight certain components.

Unless otherwise defined, all terms used in the specification have the meanings commonly understood by those skilled in the art. Well-known functions or constructions may not be described in detail for brevity and/or clarity.

As used in this specification, the singular forms "a", "an", and "the" may include the plural forms as well, unless expressly stated otherwise. The description uses the words "comprise", "comprising" and "includes" to specify the presence of stated features, but not to preclude the presence or addition of one or more other features. As used in this specification, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In the description, when an element is referred to as being "on," "attached" to, "connected" to, "contacting" or the like to another element, it can be directly on, attached to, connected to or contacting the other element or intervening elements may be present.

In the following, unless otherwise specified, "left", "right", "upper", "lower", "outer", "inner", and the like are referred to directions in the drawings. It should be understood that spatial relational terms, such as "left," "right," "upper," "lower," "outer," "inner," and the like, are intended to describe the relationship of one feature to another feature in the figures. It should be understood that the spatial relationship terms encompass different orientations of the test aid 100 in use or operation in addition to the orientation depicted in the figures.

Hereinafter, an exemplary dual mass flywheel 10 will first be described with reference to fig. 1, 2, 3. As shown in fig. 1 and 2, the dual mass flywheel 10 mainly includes a first mass 11 and a second mass 12 having a splined hole 13 at the center thereof and connected to the first mass 11. At the time of testing, as shown in fig. 3, the first mass 11 of the dual mass flywheel 10 has been fixed to the crankshaft 2 of the engine 1, but the second mass 12 is in an unsupported state, and therefore the second mass 12 may sink due to gravity or the like. Note that fig. 3 is only for explaining the mounting relationship between the dual mass flywheel 10 and the engine crankshaft, and does not truly reflect the size ratio between the dual mass flywheel 10 and the engine 1. In addition, only the portions of the dual mass flywheel that are relevant to the innovative point of the present invention are described herein, and the portions that are not relevant to the innovative point are omitted from illustration and description. These omitted parts will be apparent to those skilled in the art.

Next, a test assisting tool 100 for the dual mass flywheel 10 according to an exemplary embodiment of the present invention will be described with reference to fig. 4 to 6. Functionally, the test assisting tool 100 may mainly include an operating portion for an operator to perform an operation on the test assisting tool 100, an engaging portion configured to attach the test assisting tool 100 to the dual mass flywheel 10 through the spline hole 13 of the second mass 12, and a positioning portion configured to be inserted into a corresponding hole on the crankshaft 2 of the engine 1 so as to position the test assisting tool 100 relative to the engine. These parts will be described one by one below.

The operation portion for the operator to operate the test assisting tool 100 mainly includes a handle 111 and a rod-like member 112 fixedly connected to the handle 111. For example, the rod 112 may be fixedly connected to the handle 111 by a bolt. From the perspective shown in fig. 5 and 6, the rod-like member 112 is substantially stepped, and includes, in order, a first cylindrical portion 113 configured to be connected to the handle 111, a contact operating portion 114 having an outer diameter slightly larger than the first cylindrical portion 113 and configured to directly contact and operate an engagement claw of an engagement portion described later, and a second cylindrical portion 115 extending through the engagement portion and the positioning portion described later. The contact operation portion 114 includes, in order in a direction from the first cylindrical portion 113 toward the second cylindrical portion 115, a cylindrical section 116 and a substantially tapered section 117 having an outer diameter larger than that of the cylindrical section 116.

The engaging portions for attaching the test assist tool 100 to the dual mass flywheel 10 are located entirely outside the contact operating portion 114 and the second cylindrical portion 115 of the rod 112. The joint portion is a generally stepped cylindrical portion including two cylindrical portions. The first cylindrical portion 121 on the left side has an outer diameter close to but slightly smaller than the inner diameter of the spline hole 13 of the second mass 12 of the dual mass flywheel 10 so as to be inserted into the spline hole 13. The second cylindrical portion 122 on the right has an outer diameter larger than the inner diameter of the spline hole 13 of the second mass 12, and a shoulder 123 is formed between the first cylindrical portion 121 and the second cylindrical portion 122. When the test assist tool 100 is attached to the dual mass flywheel 10, the shoulder 123 will abut on one side surface of the second mass 12.

The interior of the first cylindrical part 121 of the engagement part is provided with a through slot for the second cylindrical part 115 of the operating part to move axially within the first cylindrical part 121. The interior of the second cylindrical portion 122 is hollow so that the operating portion's contact operating portion 114 can move axially within the second cylindrical portion 122. At least one recess 125 for accommodating at least one engagement claw 124 is also provided on the outer surface of the first cylindrical portion 121. For example, the engaging portion may be provided with three engaging claws 124 and three grooves 125 for accommodating the engaging claws 124. The engagement pawl 124 is pivotally secured to the second cylindrical portion 122 of the engagement portion by a pivot pin 126. An end portion of the engaging pawl 124 on the lower right side of the pivot pin 126 is configured to contact the contact operating portion 114, and a portion contacting the contact operating portion 114 is a rounded portion 127. The rounded portion 127 helps the contact operating portion 114 smoothly pass over the engaging claw 124. Further, an upwardly projecting hook portion 128 is also provided at the end of the engagement claw 124 on the left side of the pivot pin 126. An engagement recess 129 configured for engagement with the inner diameter portion of the second mass 12 of the dual mass flywheel 10 at the spline hole 13 hole is formed between the hook portion 128 of the engagement claw 124 and the shoulder 123 of the engagement portion. In this regard, the shoulder 123 is an opposing portion that cooperates with the hook portion 128 of the engagement claw 124. The axial length of the engagement recess 129 is equal to the thickness of the second mass 12 of the dual mass flywheel 10. When the contact operating portion 114 is located at its rightmost position without pushing out the engagement claw 124, for example, in a state before the test aid 100 is inserted into the dual mass flywheel 10, the engagement claw 124 and the hook portion 128 protruding upward thereof are retracted within the groove 125 without preventing the test aid 100 from being inserted onto the dual mass flywheel 10 through the spline hole 13 of the second mass 12. When the contact operating portion 114 is located at its leftmost position to push out the engagement claw 124, for example, in a state where the test assist tool 100 has been inserted into the dual mass flywheel 10 and has been fixed in place, the hook portion 128 of the engagement claw 124 protrudes upward relative to the spline hole 13 of the second mass 12, and a portion of the second mass 12 is clamped in the engagement recess 129 to firmly fix the test assist tool 100 to the dual mass flywheel 10, avoiding the test assist tool 100 from being thrown out of the dual mass flywheel 10 when rotating at high speed during testing of the dual mass flywheel 10.

The positioning portion for positioning the test aid 100 relative to the engine includes a positioning rod 130 configured to be inserted into a corresponding hole on the crankshaft 2 of the engine 1. The positioning rod 130 has an outer diameter substantially equal to an inner diameter of the hole in the crankshaft 2 and a length sufficient to prevent the test aid 100 inserted into the crankshaft 2 from wobbling during testing. As described above, the first mass 11 of the dual mass flywheel 10 is fixed to the crankshaft 2 of the engine 1. The test assisting tool 100 fixed to the second mass 12 of the dual mass flywheel 10 is also inserted into the crankshaft 2 of the engine 1. This ensures that the first mass 11 and the second mass 12 of the dual mass flywheel 10 are coaxial. In addition, the test auxiliary tool 100 inserted into the crankshaft 2 is equivalent to the extension of the crankshaft 2, and can support the second mass 12 of the dual mass flywheel 10 during the test, so as to avoid the radial centrifugal force generated when the dual mass flywheel 10 rotates during the test from affecting the vibration test result. Inside the positioning rod 130, there is provided a through groove 131 in which the second cylindrical portion 115 of the engagement portion axially moves.

Preferably, the positioning portion of the test assistance tool 100 may be integrally formed with the engagement portion from the viewpoint of ease of manufacture.

At the right-hand end of the second cylindrical portion 122 of the joint portion, an end cover 120 is attached for preventing the contact operating portion 114 from coming out of the second cylindrical portion 122 of the joint portion. At the center of the end cover plate 120, a through hole through which the first cylindrical portion 113 and the cylindrical section 116 of the operating portion pass is provided. A gap is left between the engaging claw 124 and the end cover 120 for the engaging claw 124 to pivot. Furthermore, biasing means (as shown in fig. 6) may be interposed between the end cover plate 120 and the engaging claw 124 for applying a biasing force to the left toward the engaging claw 124 so that the engaging claw 124 is better clamped on the second mass 12 at the time of testing.

As shown in fig. 6, when the handle 111 and the contact operating portion 114 are pushed to the leftmost position, the spring provided between the penetrating groove 131 of the positioning rod 111 and the second cylindrical portion 115 of the operating portion is caught between the enlarged portion 118 on the left side of the second cylindrical portion 115 and the shoulder 132 in the penetrating groove 131, whereby the second cylindrical portion 115 pushed to the leftmost position and the contact operating portion 114 can be prevented from moving to the right side during the test to retract the engagement claw 124 that has been pushed out, unless the operator applies a force to the handle 111 rightward to overcome the biasing force of the spring to move the second cylindrical portion 115 and the contact operating portion 114 rightward.

The operation of the test assist tool 100 for the dual mass flywheel 10 will be described below. Before testing the engine 1, the operator ensures that the handle 111 of the test aid 100 is in the position pulled out to the maximum right as shown in fig. 5. At this time, the contact operating portion 114 will be located on the right side of the engaging claw 124, and the engaging claw 124 is in a state of being retracted into the recess 125 of the first cylindrical portion 121. Then, the operator aligns the spline hole 13 of the dual mass flywheel 10, the first mass 11 of which has been attached to the crankshaft 2 of the engine 1, with the corresponding hole on the crankshaft 2, and inserts the positioning rod 130 of the test aid 100 into the hole on the crankshaft 2 from the second mass 12 side. In this process, the engagement claws 124 retracted into the grooves 125 do not interfere with the insertion of the first cylindrical portion 121 through the spline hole 13. Then, in a state where the shoulder 123 abuts on one side surface of the second mass 12 of the dual mass flywheel 10, the operator pushes the knob 111 toward the dual mass flywheel 10, so that the contact operating portion 114 is also moved toward the dual mass flywheel 10 along with it until the contact operating portion 114 abuts on the shoulder provided in the second cylindrical portion 122, as shown in fig. 6. Due to the shapes of both the rounded portion 127 at the lower right side of the engaging claw 124 and the tapered section 117 of the contact operating portion 114, the tapered section 117 of the contact operating portion 114 will smoothly move over the rounded portion 127 of the engaging claw 124 while pushing the engaging claw 124 clockwise about the pivot pin 126 upward so that the hook portion 128 of the engaging claw 124 projects upward and abuts the other side surface of the second mass 12 opposite the shoulder 123. Thus, the test assisting tool 100 is fixed to the dual mass flywheel 10, and the test assisting tool 100 is prevented from being thrown out of the dual mass flywheel 10 when rotating at a high speed during a test. Fig. 7 shows the test assist tool 100 fixed to the dual mass flywheel 10.

Preferably, the test aid 100 of the present invention may be used in cold test conditions. However, the test assistance tool 100 of the present invention may also be used in hot test conditions, for example, with some modification.

In summary, the test auxiliary tool 100 of the present invention has a simple and light structure, is convenient to operate, and can effectively prevent the second mass 12 of the test auxiliary tool 100 from radially swinging during the high-speed rotation test and prevent the cold test vibration test result from being affected by the second mass variation of the flywheel.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the utility model is not limited to the disclosed exemplary embodiments. The scope of the following claims is to be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures and functions.

Claims (10)

1. A test aid for a dual mass flywheel, the dual mass flywheel (10) comprising a first mass (11) to be fixed to a crankshaft (2) of an engine (1) at the time of testing, and a second mass (12) connected to the first mass (11) and provided with a splined hole (13), characterized in that the test aid (100) is provided with an operating portion configured for an operator to operate the test aid (100), an engaging portion configured for attaching the test aid (100) to the dual mass flywheel (10) through the splined hole (13) of the second mass (12), and a positioning portion configured to be inserted into a corresponding hole on the crankshaft (2) of the engine (1) so as to position the test aid (100) with respect to the engine, the engaging portion being provided with at least one engaging claw (124) configured to interlock with movement of the operating portion ) And an opposing portion cooperating with the engagement jaw, the engagement jaw (124) and the opposing portion being configured to releasably engage the test aid (100) to the second mass (12) of the dual mass flywheel (10).

2. The test auxiliary tool for a dual mass flywheel according to claim 1, wherein the operating portion includes a handle (111), a first cylindrical portion (113) connected to the handle (111), a contact operating portion (114) configured to contact an engaging claw (124) of the engaging portion and operate the engaging claw (124), and a second cylindrical portion (115) extending through the engaging portion and the positioning portion.

3. The test auxiliary tool for a dual mass flywheel according to claim 2, wherein the contact operating portion (114) includes a cylindrical section (116) and a tapered section (117) having an outer diameter larger than the cylindrical section (116) in order in a direction from the first cylindrical portion (113) toward the second cylindrical portion (115).

4. The test auxiliary tool for the dual mass flywheel of claim 3, wherein the engaging portion comprises a first cylindrical portion (121) and a second cylindrical portion (122), the outer diameter of the first cylindrical portion (121) is smaller than the inner diameter of the spline hole (13) of the second mass (12) of the dual mass flywheel (10) so as to be inserted into the spline hole (13); the second cylindrical portion (122) has an outer diameter larger than an inner diameter of the spline hole (13) of the second mass (12), and a shoulder (123) is formed between the first cylindrical portion (121) and the second cylindrical portion (122), the shoulder forming the opposing portion.

5. A test aid for a dual mass flywheel according to claim 4 characterised in that on the outer surface of the first cylindrical portion (121) there is also provided at least one recess (125) for housing an engagement claw (124), the engagement claw (124) being pivotally secured to the second cylindrical portion (122) by means of a pivot pin (126).

6. The auxiliary tool for testing the dual mass flywheel according to claim 4 or 5, wherein the engaging claw (124) is provided with a protruding hook portion (128), an engaging recess (129) for engaging with the second mass (12) of the dual mass flywheel (10) is formed between the hook portion (128) and the shoulder (123) of the engaging portion, and the axial length of the engaging recess (129) is equal to the thickness of the second mass (12) of the dual mass flywheel (10).

7. The test auxiliary tool for a dual mass flywheel according to any one of claims 2 to 5, wherein a portion of an end of an engaging claw (124) that contacts the contact operating portion (114) is configured as a rounded portion (127).

8. The test auxiliary tool for a dual mass flywheel according to claim 4 or 5, wherein an end cover plate (120) for preventing the contact operating portion (114) from coming out of the second cylindrical portion (122) is attached at an end of the second cylindrical portion (122), and a biasing means for applying a biasing force to the engaging claw (124) is further interposed between the end cover plate (120) and the engaging claw (124).

9. The test aid of a dual mass flywheel according to any one of claims 1 to 5, characterized in that the test aid (100) is provided with three engagement claws (124).

10. The dual mass flywheel test auxiliary tool according to any one of claims 1 to 5, wherein the test auxiliary tool (100) is used as a cold test tool for the dual mass flywheel (10) in a case where an external motor is used to drive the engine (1) for testing.

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