TWI741676B - Tensioner - Google Patents

Abstract

A tensioner suitable for installation on a frame to adjust the tightness of the chain. The tensioner includes a body for mounting on the frame, a tension rod mounted on the body so as to be displaceable along its axial direction, and a guide wheel module pivoted on the tension rod and used for meshing with the chain, And a torsion spring installed between the body and the tension rod. The torsion spring always has an elastic force that drives the tension rod to move relative to the body and drives the guide wheel module to adjust the tightness of the chain. Through the structural design of the tension rod installed on the body, the design of the torsion spring installed between the tension rod and the body, and the design of the guide wheel module installed on the tension rod, the tensioner of the present invention It can be used to automatically adjust the tightness of the chain at any time, and can be easily installed on the inside of the frame to prevent collisions.

Description

Tensioner

The invention relates to a chain adjustment transmission, in particular to a tensioner used for adjusting the tightness of the chain.

The chain is a common transmission component of mechanical vehicles, which can be sleeved between two meshing gears with a certain degree of tightness to transmit power. However, when the chain is used, its circumference will gradually become longer due to the rotation and wear of its components and the friction and wear between the gears, so that the necessary tightness between the gears can no longer be maintained, in addition to affecting the stability of power transmission In addition, the link drop problem is also prone to occur.

In order to enable the chain to maintain a certain degree of tightness with the gear at any time, some manufacturers have developed a tensioner that can be installed on the frame and can be used to adjust the tightness of the chain. For example, the mainland patent CN103387036, but the tensioner does not automatically To adjust the tightness of the chain, the user has to check the wear of the chain at regular intervals, and then manually adjust the pivot angle between the components of the tensioner to adjust the tightness of the chain, and the tensioner also It cannot be used to detect and remind the wear degree of the chain.

Therefore, the object of the present invention is to provide a tensioner that can improve at least one of the disadvantages of the prior art.

Therefore, the tensioner of the present invention is suitable for being installed on a frame to adjust the tightness of a chain. The tensioner includes a body for mounting on the frame, a tension rod mounted on the body so as to be able to be displaced along its axial direction, and a guide wheel pivoted on the tension rod and used for engaging with the chain Module, and a torsion spring installed between the body and the tension rod. The torsion spring always has an elastic force that drives the tension rod to move relative to the body and drives the guide wheel module to adjust the tightness of the chain.

The effect of the present invention is: through the structural design of the tension rod installed on the body, the design of the torsion spring installed between the tension rod and the body, and the design of the guide wheel module installed on the tension rod, The tensioner of the present invention can be used to automatically adjust the tightness of the chain at any time, and can be conveniently installed on the inner side of the frame to prevent collision.

Before the present invention is described in detail, it should be noted that in the following description, similar elements are denoted by the same numbers.

Referring to FIGS. 1, 2, and 3, the embodiment of the tensioner 200 of the present invention is suitable for being installed on a frame 800, and can be used to automatically adjust the tightness of a chain 900 installed on the frame 800. The tensioner 200 includes a body 3 for mounting and fixing on the frame 800, a tension rod 4 that can be telescopically inserted into the body 3, and a tension rod 4 pivoted on the tension rod 4 and exposed to the The guide wheel module 5 used to engage the chain 900 under the main body 3, an indicator 6 installed on the tension rod 4 and exposed on the side of the main body 3, and an indicator element 6 installed on the main body 3 and the tensioner The torsion spring 7 between the rods 4. For the convenience of description, in the following embodiments, the running direction of the chain 900 is defined as the front-to-rear direction, and the left-to-right direction is defined accordingly.

The main body 3 has a sliding groove 31 extending up and down, and a limiting guide groove 32 and an indexing groove 33 that are connected to the sliding groove 31 in the left and right directions and extend up and down along the length of the sliding groove 31. The indexing groove 33 is connected to the The limiting guide grooves 32 are respectively located on the left and right sides of the main body 3. The main body 3 also has a scale 30 extending up and down on its left side and adjacent to the index groove 33 and marked with a scale representing the degree of wear.

The tension rod 4 has a sliding rod portion 41 that can be inserted into the sliding groove 31 and can be slid up and down along its axial direction, and a sliding rod portion 41 connected to the bottom end of the sliding rod portion 41 and exposed below the body 3 The pivotal portion 42. The pivoting portion 42 is in a U-shape with an opening facing downward, and has two pivotal walls 421 between which the chain 900 is arranged with two spaced left and right.

The guide wheel module 5 has a shaft connection assembly 51 pivoted between the pivoting walls 421 in the left and right directions, and a shaft connection assembly 51 sleeved on the shaft connection assembly 51 and located between the opposite sides of the pivoting wall 421 for use. The gear 52 meshes with the chain 900 upward, and the guide wheel module 5 cooperates with the pivotal portion 42 to define a space for the chain 900 to extend forward and backward, and to move the chain 900 left and right. (That is, the axial displacement of the chain 900) the free space 420 is limited. In this embodiment, the axle connecting assembly 51 has two axle connecting members 511 that are respectively penetrated through the pivotal wall 421 and can be detachably assembled to each other. However, because it is used to rotatably pivot the gear 52 There are many structural designs of the axial connection assembly 51 provided between the pivoting walls 421, so in implementation, the axial connection assembly 51 is not limited to the above-mentioned aspect.

The index member 6 is exposed and inserted in the index groove 33 and assembled to the top section of the sliding rod portion 41. It can be interlocked by the sliding rod portion 41 to move up and down along the index groove 33, and can be used for indexing The scale of the scale 30.

The torsion spring 7 has a first end 71 installed and fixed on the bottom end of the main body 3, and a second end inserted into the limiting guide groove 32 and inserted in the top section of the sliding rod 41 72. In this embodiment, the torsion spring 7 always has an elastic force that drives the first end 71 and the second end 72 to swing up and down, because the first end 71 is fixed to the body 3, and the first end 71 The two end portions 72 are pierced in the limit guide groove 32 so as to be displaceable up and down, so the elastic force of the torsion spring 7 will constantly drive the second end portion 72 to move upward along the length of the limit guide groove 32 to drive the The sliding rod portion 41 moves upward relative to the main body 3 and retracts into the sliding groove 31.

When the tensioner 200 of the present invention is installed on the frame 800 to adjust the tightness of the chain 900, the body 3 can be installed and fixed on the frame 800 first, and located inside the frame rod of the frame 800, The shaft connection assembly 51 is disassembled to disassemble the gear 52 from the pivot part 42 of the tension rod 4. Next, the tension rod 4 is elastically stretched downward relative to the main body 3, so that the pivotal portion 42 of the tension rod 4 is sleeved down on the left and right sides of the chain 900. At this time, the torsion spring 7 The second end 72 is linked by the tension rod 4 to swing downward to lean against the first end 71, and is elastically driven to accumulate a reset elastic force. Then, install the guide wheel module 5 back to the pivot portion 42, so that the gear 52 meshes up with the bottom side of the chain 900, and the chain 900 is confined in the free space 420 to complete the tensioner 200 installation.

1, 4, and 5, when the tensioner 200 is used to adjust the tightness of the chain 900, the elastic force accumulated by the torsion spring 7 will drive the tension rod 4 to drive the guide wheel module 5 to elastically push up the The chain 900 is stretched to maintain a predetermined tightness.

6 and 7, when the chain 900 wears out after a period of use, causing the circumference of the chain 900 to become larger due to wear, the elastic force of the torsion spring 7 of the tensioner 200 will synchronously drive the tension rod 4 drives the guide wheel module 5 to move up relative to the main body 3 to stretch the chain 900, so that the chain 900 can be automatically maintained at a predetermined tightness at any time.

During the adjustment of the tightness of the chain 900 by the tensioner 200, the index member 6 is synchronized and linked by the tension rod 4 to move upward along the index groove 33, and can be used to produce an indexing function on the scale 30. Therefore, the user can immediately know the current degree of wear of the chain 900 by looking at the corresponding relationship between the indicator 6 and the scale 30.

In this embodiment, the pivoting portion 42 of the tension rod 4 has two pivoting walls 421, which can cooperate with the guide wheel module 5 to define the free space 420. However, in implementation, the present invention In another embodiment, the pivoting portion 42 may also have only one pivoting wall 421, which is only covered by one of the left and right sides of the chain 900.

It must be noted that the components of the tensioner 200 of the present invention can be made of metal materials and/or plastic materials, and most of the components can be changed to plastic materials to make the finished tensioner 200 lighter. Quantitative characteristics.

In summary, through the structural design of the tension rod 4 installed on the body 3, the design of the torsion spring 7 installed between the tension rod 4 and the body 3, and the bottom end of the tension rod 4 The design of the guide wheel module 5 makes the tensioner 200 of the present invention available for installation on the inside of the frame 800. In addition to being used to automatically adjust the tightness of the chain 900 at any time, this installation method also helps to avoid being The impact of foreign objects is damaged, and the appearance of the frame 800 will not be affected or changed. Furthermore, through the design of the scale 30 and the indicator element 6, it is convenient for the user to clearly observe the degree of wear of the current chain 900. In addition, because the tensioner 200 is installed according to the running trajectory of the chain 900 and confines the chain 900 in the free space 420, it can promote the chain 900 to maintain a certain degree of stability during the stretched process, which is not easy In the event of a chain drop problem, the degree of wear between the chain 900 and the chain 900 can also be reduced. Therefore, the tensioner 200 of the present invention implements a rather innovative and practical creation, and can indeed achieve the purpose of the invention.

However, the above are only examples of the present invention. When the scope of implementation of the present invention cannot be limited by this, all simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the content of the patent specification still belong to Within the scope covered by the patent of the present invention.

200: Tensioner 3: Ontology 30: scale table 31: Chute 32: limit guide groove 33: Guidance Slot 4: Tension rod 41: Slider 42: Pivot 420: Free Space 421: Pivot Wall 5: Guide wheel module 51: Shaft connection assembly 511: Shaft connection 52: Gear 6: Indicator pieces 7: Torsion spring 71: first end 72: second end 800: Frame 900: chain

Other features and effects of the present invention will be clearly presented in the embodiments with reference to the drawings, in which: Figure 1 is a perspective schematic view of an embodiment of the tensioner of the present invention installed on a frame to adjust the tightness of a chain; Figure 2 is a perspective view of the embodiment from another perspective; Figure 3 is a perspective exploded view of the embodiment; Figure 4 is a front view of the embodiment; Figure 5 is a left side view of the embodiment when it is installed on the chain, and illustrates the situation when the chain is not worn out and the tension rod protrudes down to the maximum length; Figure 6 is a view similar to Figure 2 illustrating the situation when a tension rod retracts upward into a body; and Fig. 7 is a left side view similar to Fig. 6, illustrating the situation where the chain has worn out and the tension rod retracts upward into the body.

200: Tensioner

3: Ontology

30: scale table

31: Chute

33: Guidance Slot

4: Tension rod

41: Slider

42: Pivot

420: Free Space

421: Pivot Wall

5: Guide wheel module

51: Shaft connection assembly

52: Gear

6: Indicator pieces

7: Torsion spring

71: first end

800: Frame

900: chain

Claims (7)

A tensioner is suitable for installation on a frame to adjust the tightness of a chain, and includes: a body for installation on the frame, with a longitudinally extending chute, and a lateral connection with the A chute and a limit guide groove extending along the length of the chute; a tension rod, which is mounted on the body so as to be displaceable in the axial direction, and has a displaceable insert in the chute of the body A sliding rod part, and a pivoting part; a guide wheel module, pivoted on the pivoting part of the tension rod, and used to engage with the chain; and a torsion spring installed on the body and the tension rod The torsion spring has an elastic force that drives the tension rod to move relative to the body and drives the guide wheel module to adjust the tightness of the chain. The torsion spring has a first end fixed to the body, and a first end that passes through the body. The limiting guide groove is connected to the second end of the sliding rod part, and the torsion spring can be elastically moved along the length of the limiting guide groove with the second end to link the tension rod to move relative to the main body. The tensioner according to claim 1, wherein the body further has an index groove that is laterally connected to the chute and extends along the longitudinal direction of the chute, and the tensioner further includes an index groove and exposed on the index groove. The indicator piece can be moved by the sliding rod part to move along the length direction of the guiding groove. The tensioner according to claim 2, wherein the limit guide groove and the guide groove communicate with each other. The tensioner according to claim 2, wherein the outer surface of the body has a Adjacent to the index groove and marked with a scale representing the degree of wear. The tensioner according to claim 1, wherein the pivotal portion has two pivotal walls between which the chain is arranged, and the guide wheel module includes a shaft pivotally connected to the pivotal wall Connecting assembly, and a gear mounted on the axle connecting assembly and located between the pivotal walls for meshing with the chain. The tensioner according to claim 5, wherein the gear and the pivotal wall cooperate to define a free space for limiting the axial displacement of the chain. The tensioner according to claim 5, wherein the shaft connection assembly has two detachable assembly connected through the pivoting wall, and the gear is pivoted between the pivoting walls的轴接件。 The shaft connection.

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