JP2540871Y2 - Crawler for snow - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to a crawler mainly used for snowmobiles such as snowmobiles and snowbikes.

(Prior Art) As this kind of crawler, there is one disclosed in U.S. Pat. No. 4,613,006 or the like. This crawler is formed by integrally forming lugs at regular intervals in the circumferential direction on the outer peripheral surface of the elastic band-shaped main body, and engaging holes for engaging with driving wheels are provided at regular intervals in the circumferential direction at the center in the width direction. Have been.

9 to 12, lugs a in FIG. 9 are provided parallel to each other in the width direction of the main body b, have the same root width W, and have a pressing surface C ( gradient that inclination angle theta ₁ of the front) is set to gentler than the gradient i.e. the inclination angle theta ₂ of the rear d (see FIG. 10). The lug a in FIG. 11 has a base width W that is gradually increased outward from the center in the width direction of the main body b. The lug a shown in FIG. 12 is formed in a curved shape so that the base width W is the same and the central portion in the width direction of the main body b projects in the crawler moving direction (indicated by an arrow A in the figure). I have.

(Problem to be Solved by the Invention) By the way, the relationship between the gradient θ ₁ of the press contact surface C of the lug a and the traction is such that the traction is greater when the gradient θ ₁ is steeper on the snowy road, and the gradient θ is higher on the fresh snow road. ₁ is moderate (θ ₁ <
45 °) has more traction. Therefore, the ninth
In the case of the rug a shown in the drawing, there is traction loss when traveling on a snow-covered road, and in the case of the lag a in FIG.
The lug a shown in FIG. 12 has a problem that the lug base width W is wide, cracks are easily generated at the lug base due to bending fatigue, and durability is poor.

The present invention has been made in view of the above-mentioned situation. The purpose of the present invention is to provide effective traction on all snowy roads such as fresh snow and compacted snowy roads, to prevent skidding and to prevent bending fatigue. Another object of the present invention is to provide a crawler for snow that can improve cracking and suppress crack generation.

(Means for Solving the Problems) In the present invention, the following technical measures were taken to achieve the above object.

That is, the present invention firstly provides the end portion 2a of the endless band-shaped main body 2 made of an elastic material with the engaging portion 4 engaging with the driving wheel 9.
Are arranged at circumferential intervals, and a lug 7 having a front surface 13 on the trailing side on the ground, a press contact surface 12 on the leading side on the ground, and a top surface on the outer peripheral surface 6 of the main body 2 and extending over substantially the entire width in the main body width direction. The lug 7 is integrally formed at a constant interval in the circumferential direction, and the root portion of the lug 7 is bent at both ends of the central portion 7a substantially corresponding to the central portion of the main body in the leading direction of the ground to form steps 14, 15, and the steps 14, 15 are formed. It is characterized in that it is bent substantially in the width direction from 15 to form both wing parts 7b, the press contact surface 12a of the central part 7a is formed on a steeply inclined surface, and the press contact surface 12b of the both wing parts 7b is formed on a gentle inclined surface. And

Second, the central portion 2a of the endless band-shaped main body 2 made of an elastic material
An engaging portion 4 for engaging with the driving wheel 9 is disposed at a circumferential interval, and the outer peripheral surface 6 of the main body 2 has a front surface 13 on the trailing side, a press contact surface 12 on the leading side, and a top surface. And a lug 7 extending over substantially the entire width in the body width direction is integrally formed at a constant interval in the circumferential direction, and a root portion of the lug 7 is a central portion 7a substantially corresponding to the center portion of the main body.
Are bent in the leading direction of the ground at both ends to form step portions 14 and 15, and are bent substantially in the width direction from the step portions 14 and 15 to form the two wing portions 7b, and the press contact surface 12a of the central portion 7a is steeply inclined. The front surface 13a is formed with a gentle slope, the press-contact surface 12b of the two wing portions 7b is formed with a gentle slope, and the front surface 13b is formed with a steep slope. , 15 and up to the wing portions 7b, the root portions have substantially the same circumferential width and the top surface is formed substantially linearly.

Third, the root portion and the top surface of the lug 7 have a double-wing portion.
7b is characterized by being bent from the middle part to the outer end part so as to be gradually located on the leading side of the ground.

(Operation) According to the present invention, the driving force of the driving wheel 9 is transmitted to the main body 2 of the crawler 1 via the engaging portion 4 provided on the main body 2.
When traveling on a flat snowy road, the entire width of the main body 2 in the width direction and its lugs 7
Acts to demonstrate straight running performance. In the snowy road, strong traction is obtained by the press contact surface 12a of the central portion 7a of the lug 7, and the strong traction prevents skidding.

Further, the main body 2 is bent at a gentle root portion of the lug 7 (the central portion 7a is the front surface 13a, and both outer wing portions 7b are the root portions of the press contact surfaces 12b), and the bending fatigue resistance is improved.
Crack generation is suppressed.

Furthermore, side slip is prevented by the gradient boundary steps 14, 15 between the central portion 7a of the lug 7 and the two wing portions 7b.

On a new snowy road, strong traction is obtained by the gentle contact surfaces 12b of both outer wing portions 7b of the lug 7, and sufficient running performance is secured.

During bank running, not only the center 2a in the width direction of the main body 2 but also the wings 2b act along the shape of the bank, and strong traction is obtained, and the gradient boundary step between the center 7a of the lug 7 and the two wings 7b is obtained. 14,15 prevents skidding. Also,
The bending of the wing portion 2b occurs at the outer ends of the pair of left and right engagement protrusions 4.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

1 to 4 show a first embodiment of the present invention, in which a crawler 1 has a projection-like engaging portion on an inner peripheral surface 3 of an endless band-shaped main body 2 formed of an elastic material such as rubber or synthetic resin. 4 (hereinafter referred to as engagement projections) and a reinforcing rib 5 are provided integrally, and a lug 7 is provided on the ground side, that is, on the outer peripheral surface 6.

The main body 2 has the same thickness as a whole, and has wing portions 2b formed on both left and right sides of a width direction central portion 2a, and a plurality of layers of tensile members 8 are embedded therein. The tensile member 8 includes a central cord layer made of polyester or steel or the like.
It has a three-layer structure of a thick woven layer formed of polyamide or the like on the outer peripheral side.

A drive wheel 9, a driven wheel, and a rolling wheel (not shown) can be rolled on the inner peripheral surface 3 of the main body 2, and a central portion 2 a and a wing portion
2b, a pair of left and right engaging projections 4
Are provided at regular intervals in the circumferential direction, and the reinforcing ribs 5 are formed parallel to each other between the outer surface of each engaging projection 4 and the inner peripheral surface of each of the left and right wing portions 2b. The height of the reinforcing ribs 5 is gradually reduced toward the outer end of the wing portion 2b, thereby improving restorability and traction when curved and deformed along the bank shape during bank running. Note that the circumferential thickness of the reinforcing ribs 5 is
Although it is thinner, it may be the same as the engagement protrusion 4 or even thinner than the illustrated example, and may be formed from the engagement protrusion 4 to the middle portion in the left-right direction of the wing portion 2b.

The drive wheels 9 are such that pins 11 are arranged at equal intervals in the circumferential direction on the outer periphery of two disks 10 as shown by the two-dot chain line in FIGS. Both ends of the pin 11 projecting outward are engaged with a pair of left and right engagement projections 4 to transmit rotational power.

The lugs 7 are provided on the outer peripheral surface 6 of the main body 2 at regular intervals in the circumferential direction and correspond to the engagement projections 4, and correspond to the widthwise central portion 7 a of the main body 2, that is, between the left and right engagement projections 4. The outer wing portion 7b formed on the wing portion 2b of the main body 2 is bent (inclined) so as to be gradually located closer to the ground contact side from the middle portion to the outer end portion. . In FIGS. 1 and 2, assuming that the snowmobile advances in the direction of arrow a, the driving wheel 9 rotates in the direction of arrow b, and the lug 7 is
Is the leading side of the ground, the front 13 is the trailing side of the ground, and both wings 7b
If the outer end is inclined toward the ground leading side from the center side in the width direction, the outer end is grounded first, and the central portion 7a is grounded later.

The central portion 7a of the lug 7, the gradient i.e. the inclination angle theta ₁ is large contact face 12a, and are opposite a small slope i.e. inclination angle theta ₂ of the front 13a (about 45 ° or less), both The outer wing portion 7b has a small inclination angle θ ₃ of the press contact surface 12b (about 45 ° or less) and an inclination angle θ ₄ of the opposite front surface 13b.
Has been bigger.

The distribution of the contact pressure of the crawler 1 is shown in FIG.
As shown in FIG. 8 (b) (in the case where the tensile body is buried) and FIG. 8 (b) (in the case where the tensile body is not provided), the portion E between the outer end faces of the pins 11 of the drive wheel 9 is high, and the both outer wing portions F Gradually lower toward the end.

Therefore, the inclination angle θ of the press contact surfaces 12a, 12b of the lug 7
₁ and θ ₃ are large in a portion where the contact pressure is high, and small (below 45 °) in a portion where the contact pressure is low. That is,
The gradient of the pressure contact surface 12a of the central portion 7a in the body width direction is large (steep), and the gradient of the pressure contact surface 12b of both outer wing portions 7b is small (gentle).

Each lug 7 has the same root width W of the central portion 7a and the outer wing portion 7b, and has step portions 14, 15 formed at the gradient boundary portions of both portions 7a, 7b. Reference numeral 15 indicates a function of preventing the crawler 1 from skidding. In addition, the step portions 14 and 15 are formed with a wrap portion in which the press contact surface 12a side is located closer to the inward facing side and the front surface 13a side is located closer to the outward facing side.

In the first embodiment, the driving force of the driving wheels 9 when traveling on fresh snow or on a snow-covered road is transmitted to the main body 2 of the crawler 1 via the pins 11 and the engagement protrusions 4. When traveling on flat snowy roads,
The entire width in the width direction of the main body 2 and both press contact surfaces 12a and 12b of the lug 7 thereof
Acts to demonstrate straight running performance. In the snowy road, strong traction is obtained by the steeply pressing surface 12a of the central portion 7a of the lug 7, and the traction and the slope boundary step portions 14, 15 prevent skidding.
Further, the main body 2 is provided with a gently sloped base portion 12b of the lug 7,
Since it is bent at 13a, the bending fatigue resistance is improved, and the occurrence of cracks is suppressed.

When traveling on a new snowy road, strong traction is obtained due to the gentle pressure contact surface 12b of both outer wing portions 7b of the lug, and sufficient traveling performance is exhibited.

In addition, when running in the bank, not only the central portion 2a in the width direction of the main body 2 but also the wing portion 2b acts along the bank shape, and strong traction is obtained, and the lug 7 has slope boundary steps 14,15.
This prevents skidding. The wing portion 2b is bent at the outer ends of the pair of left and right engagement protrusions 4, but the reinforcing rib 5
, Preventing cracks generated at the base of the main body 2 and the base of the engaging projection 4 and exhibiting good bending restorability.

FIGS. 5 and 6 show a second embodiment of the present invention, which differs from the first embodiment in that anti-skid projections 16 are provided near the central portion 7a of the lug 7 and both ends of the front surface 13a. Others are exactly the same. According to the second embodiment, the anti-skid function is more improved than the first embodiment, but the other effects are the same as those of the first embodiment.
The same reference numerals as in the first embodiment denote the same parts, and a detailed description thereof will be omitted.

FIG. 7 shows a third embodiment of the present invention, which is different from the first embodiment in that both outer wing portions 7b of the lug 7 are formed in parallel with the central portion 7a and in a straight line. Since the operation and effect can be expected, the same reference numerals as those in the first embodiment are assigned and the detailed description is omitted.

In the crawler for snow shown in the above embodiment, an engaging portion 4 for engaging with a driving wheel 9 is disposed at a central portion 2a of an endless band-shaped main body 2 made of an elastic material at a circumferential interval. A lug 7 having a front surface 13 on the trailing side on the ground side, a pressure contact surface 12 on the leading side on the ground side, and a top surface, and extending over substantially the entire width in the width direction of the main body is integrally formed at regular intervals in the circumferential direction. The part is bent in the leading direction of the ground at both ends of the center part 7a substantially corresponding to the center part of the main body to form steps 14, 15 and from the steps 14, 15 is bent substantially in the width direction to form the two wing parts 7b And the central part
The press contact surface 12a of 7a is formed on a steeply inclined surface, the front surface 13a is formed on a gentle inclined surface, the press contact surface 12b of both wing parts 7b is formed on a gentle inclined surface, and the front surface 13b is formed on a steeply inclined surface. Central part of 7
From a to the wing portion 7b through the step portions 14 and 15, the circumferential width of the root portion is formed substantially the same and the top surface is substantially straight (at least from the center portion 7a to the middle portion of the wing portion 7b)
Is formed.

In the case where the root portion and the top surface of the two wing portions 7b of the lug 7 are bent (inclined) from the middle part to the outer end portion of the two wing portions 7b so as to be gradually located on the leading side of the ground (Example 1, 2) and a case where the wing portion 7b is substantially straight over the entire length.

The present invention is not limited to the above embodiments,
Various modifications can be made. For example, the central part of the main body 2
Only the flat portion 2a is a flat portion, and both outer wing portions 2b can be bent outward and upward from the side ends of the flat portion, so that the center portion 2a of the main body 2 can be thicker than the wing portion 2b. Further, the engaging portion may be a rectangular engaging hole instead of the projection 4.

(Effects of the Invention) In the present invention, as described above, the root portion of the lug 7 is bent in the leading direction of the ground at both ends of the center portion 7a substantially corresponding to the center portion of the main body to form the step portions 14 and 15, The two wing portions 7b are formed by being bent substantially in the width direction from the step portions 14, 15, and the center portion 7a
Of the wing portion 7b.
Since 2b is formed on a gentle slope, the anti-slip function and bending fatigue resistance are improved, and cracks are suppressed.
Due to the steps 14, 15 and the steeply inclined pressure contact surface 12a of the central part 7a, a recess is formed on the leading side of the central part 7a in contact with the ground.
In 7a, since the body load is applied and the ground pressure is high, the snow can be caught in this recess, and it can be pushed strongly on the snowy road and while pressing the snow, the traction increases,
The gentle slope contact surface 12b of 7b can be pressed while holding down snow, and traction can be generated even in fresh snow, and the wing portion 7b has a lower ground pressure than the central portion 7a and tends to escape from the road surface However, traction can be generated by the action of pressing down snow.

Also, the root portion of the lug 7 is bent at both ends of the central portion 7a in the direction preceding the ground to form steps 14, 15, and this step is formed.
Bent approximately in the width direction from 14 and 15 to form both wings 7b,
The press contact surface 12a of the central portion 7a is formed as a steeply inclined surface and the front surface 13a
Is formed on a gently inclined surface, the press contact surface 12b of the wing portions 7b is formed on a gently inclined surface, and the front surface 13b is formed on a steeply inclined surface. Up to 7b,
Since the circumferential width of the root portion is formed substantially the same and the top surface is formed substantially linear, the lug 7 is required to be a minimum even if the center portion 7a has a recess on the leading side of the ground contact. At the same time, the steeply inclined surface of one lug 7 is opposed to the gentlely inclined surface of the adjacent lug 7 so that snow can be captured and eliminated well, and the snow on the top surface of the lug 7 can be improved. Good biting can be achieved.

Further, since the root portion and the top surface of the lug 7 are gradually bent from the middle portion to the outer end portion of the both wing portions 7b so as to be located on the leading side of the ground, the lug 7 is sequentially moved from both outer end sides of the main body 2 to the center side. The lug 7 can catch the snow so as to be pushed to the center side, and the traction can be further increased.

[Brief description of the drawings]

1 to 4 show a first embodiment of the present invention. FIG. 1 is a sectional view taken along line AA of FIG. 2, FIG. 2 is a plan view of a ground side (outer peripheral side), and FIG. FIG. 4 is a cross-sectional view taken along the line BB of FIG. 3, FIG. 5 and FIG. 6 show a second embodiment of the present invention, and FIG. FIG. 6 is a cross-sectional view taken along the line CC of FIG. 5, FIG. 7 is a ground-side plan view showing a third embodiment of the present invention, and FIGS. FIG. 9 to FIG. 12 show a conventional example,
9 is a plan view on the ground side, FIG. 10 is an enlarged sectional view taken along line DD of FIG. 9, and FIGS. 11 and 12 are plan views on the ground side. DESCRIPTION OF SYMBOLS 1 ... Crawler, 2 ... Body, 2a ... Central part, 4 ... Engagement part, 6 ... Outer peripheral surface, 7 ... Lug, 7a ... Central part, 7b
...... Outer wing part, 9 ... Drive wheel, 12a, 12b ... Press contact surface, 1
3a: Front, 16: Side-slip prevention projection.

Claims (3)

(57) [Scope of request for utility model registration] An engaging portion (4) for engaging with a driving wheel (9) is disposed at a central portion (2a) of an endless belt-shaped main body (2) made of an elastic material with a circumferential interval therebetween. A lug (7), which has a front surface (13) on the trailing side on the ground, a pressure contact surface (12) on the leading side on the ground, and a top surface on the outer peripheral surface (6) of the main body (2) and extends over substantially the entire width in the main body width direction. The lug (7) is integrally molded at regular intervals, and the root portion of the lug (7) is bent in the leading direction of the ground at both ends of the center portion (7a) substantially corresponding to the center portion of the main body, so that the step portion (14,
15) is formed, and the two wing portions (7b) are formed by being bent substantially in the width direction from the step portions (14, 15), and the press contact surface (12a) of the central portion (7a) is formed into a steeply inclined surface, A crawler for snow, wherein a press contact surface (12b) of both wing portions (7b) is formed on a gentle slope. 2. An endless band-shaped main body (2) made of an elastic material is provided at its center portion (2a) with an engaging portion (4) for engaging with a driving wheel (9) at a circumferential interval. A lug (7), which has a front surface (13) on the trailing side on the ground, a pressure contact surface (12) on the leading side on the ground, and a top surface on the outer peripheral surface (6) of the main body (2) and extends over substantially the entire width in the main body width direction. The lug (7) is integrally molded at regular intervals, and the root portion of the lug (7) is bent in the leading direction of the ground at both ends of the center portion (7a) substantially corresponding to the center portion of the main body, so that the step portion (14,
15) is formed, and the two wing portions (7b) are formed by bending the step portions (14, 15) substantially in the width direction, and the press contact surface (12a) of the central portion (7a) is formed into a steeply inclined surface; The front surface (13a) is formed on a gentle slope, the pressure contact surface (12b) of the wing portions (7b) is formed on a gentle slope, and the front surface (13b) is formed on a steep slope, and the central portion of the lug (7) is formed. From the step (7a) to the two wings (7b) through the steps (14, 15), the width of the root in the circumferential direction is substantially the same and the top surface is formed in a substantially straight line. Crawler for snow. 3. The snow-covered structure according to claim 1, wherein a root portion and a top surface of the lug (7) are bent so as to be gradually located closer to the ground contact side from a middle portion to an outer end portion of the wing portion (7b). For crawler.