Straddle seat

Abstract

A straddle seat for a vehicle comprises a seating member (11) and is formed of a single material such as an elastomer resin, for example, wherein the seating member (11) is configured to have a seating surface part (11A) at an upper part and to be provided with a vehicle body attachment part (12), that couples with a vehicle body frame, at a lower part. Furthermore, a seating part (20) deployed in a planar shape covering a frame of the vehicle, a plurality of ribs (30) suspended toward the frame side from a rear surface of the seating part, and mount parts (M1, M2) for mounting the straddle seat onto the frame, are formed, the mount parts being formed on the ribs.

Description

Saddle type seat

[0001] The present invention relates to a saddle type seat used for vehicles including motorcycles, automobiles and the like.

[0002] For vehicles on which a rider rides astride, such as motorcycles, a saddle type seat is generally employed. Conventionally, as inventions relating to saddle type seats, there is, for example, one described in Patent Document 1. The above-mentioned conventional saddle type seat is composed of a bufferable surface layer made of an elastomer resin and a support portion made of a cured resin that supports the surface layer from the back surface side, in order to reduce the number of parts and man-hours.

[0003] Japanese Patent Application Laid-Open No. 2001-341560

[0004] In motorcycles, from the perspective of material recycling, there is a demand for saddle type seats that use urethane material as little as possible. In addition, for saddle type seats, there is also a demand for performance that allows comfortable seating even in winter when the air temperature is low. The vehicle seat described in Patent Document 1 has a surface layer formed of an elastomer resin, so it has the advantages of good productivity and no requirement for a urethane material. However, for vehicle seats, in order to improve recyclability, further reduction in the number of parts is required. Furthermore, in recent years, from the perspective of material recycling, the demand for a saddle type seat made of a single material has increased, and a conventional saddle type seat composed of a surface layer and a support portion using different materials cannot meet the above-mentioned demand.

[0005] The present invention has been made in view of the above circumstances, and an object thereof is to provide a saddle type seat capable of reducing the number of parts and improving recyclability.

[0006] In order to solve the above problems, the invention according to claim 1 is: A saddle type seat for a vehicle provided with a seating member that supports a seated state of an occupant, wherein the seating member has a seating surface portion at an upper portion thereof, and a vehicle body attachment portion coupled to a vehicle body frame is provided at a lower portion thereof.

[0007] The invention described in claim 2 is a saddle seat according to claim 1, characterized in that it is a saddle seat on which a person straddles and sits, comprising: a seating portion that unfolds in a planar shape to cover the frame of a vehicle; a plurality of ribs that hang down from the back surface of the seating portion toward the frame side; and mounting portions formed on the ribs for setting the saddle seat onto the frame. The invention described in claim 3 is a saddle seat according to claim 2, characterized in that the mounting portion is a groove-shaped portion consisting of recesses formed in the plurality of ribs.

[0008] The invention described in claim 4 is characterized in that, in the saddle seat described in claim 3, the mounting portion is formed such that, in addition to the rib in which the recess is formed, a rib along the groove-shaped portion is formed at the location where the groove-shaped portion is formed or adjacent to the groove-shaped portion.

[0009] The invention described in claim 5 is characterized in that, in the saddle seat described in claim 3, the rib includes a transverse rib provided from one side wall portion to the other side wall portion in the width direction of the seat portion.

[0010] The invention described in claim 6 is a saddle seat as described in claim 5, wherein the mounting portion includes first mounting portions provided on one side and the other side in the seat width direction, in front of the seated position of the person seated, and the end of the transverse rib on the frame side, which extends from one first mounting portion in the seat width direction to the other first mounting portion, is arch-shaped, with the hanging length becoming shorter towards the center in the seat width direction.

[0011] The invention described in claim 7 is characterized in that, in the saddle seat described in claim 5, the ribs include a plurality of longitudinal ribs provided along the front-rear direction of the seat, and the longitudinal ribs and transverse ribs intersect in a grid pattern in front of the seated position of the person sitting, forming a grid section.

[0012] The invention described in claim 8 is characterized in that, in the saddle seat described in claim 7, the ribs are formed in a range that includes the seating position of the person sitting, and include a cushioning portion having a structure with lower rigidity than the lattice portion.

[0013] The invention described in claim 9 is characterized in that, in the saddle seat described in claim 8, the cushioning portion has an ischial bone holding portion at a position corresponding to the ischial bones of the sitter, where the hanging height of the ribs is lower than that of the surrounding area.

[0014] The invention described in claim 10 is characterized in that, in the saddle seat described in claim 9, the longitudinal rib in the center in the width direction of the seat is formed over the entire length in the front-rear direction of the seating portion.

[0015] The invention described in claim 11 is a saddle seat as described in claim 2, wherein the rear end of the saddle seat is provided with a rear mounting portion that protrudes downward from the surrounding area, and the rear mounting portion has a certain width in the front-rear direction.

[0016] According to the invention described in claim 1, the entire seat can be constructed from a single component, making it easier to reduce the number of parts and improve recyclability. Furthermore, because it has a vehicle body mounting portion, it is easy to easily attach and secure the seat to the vehicle frame. According to the invention described in claim 2, since ribs are provided on the seating portion and mounting portions are formed on the ribs, it is easy to integrally form these from a single material. Therefore, it is possible to reduce the number of parts and improve recyclability.

[0017] According to the invention described in claim 3, since the mounting portion is a groove-shaped portion consisting of a recess formed in the rib, the rib also serves as the mounting portion, eliminating the need to form a separate mounting portion and thus reducing weight. Furthermore, even if a load from the sitter is applied to the center of the seating portion, the groove-shaped portion can fit into the frame side and maintain its original position, thereby suppressing the occurrence of curling up of the outer circumference.

[0018] According to the invention described in claim 4, the mounting portion has ribs formed along the groove-shaped portion, separate from the ribs with recesses, at the location where the groove-shaped portion is formed or adjacent to the groove-shaped portion. As a result, the multiple ribs with recesses are firmly held in the direction along the groove-shaped portion, increasing the rigidity around the groove-shaped portion and suppressing deformation, thereby more effectively suppressing the curling up of the outer circumference of the seating portion.

[0019] According to the invention described in claim 5, the seat portion includes transverse ribs that extend from one side wall portion to the other side wall portion in the seat width direction, so that the transverse ribs hold the left and right side walls, making it possible to more effectively suppress the occurrence of curling up.

[0020] According to the invention described in claim 6, the mounting portion is located in front of the seated position of the occupant, and the frame-side end of the transverse rib, which extends from one first mounting portion to the other first mounting portion in the seat width direction, is arched. Due to this arched shape, when a load is applied from above the seat surface, the effect of the arched shape converts it into a compressive force directed in the left-right direction, thereby increasing rigidity, and the seat can be supported without the lower end of the transverse rib contacting the frame. As a result, the stiffness of the vehicle frame is not transmitted to the occupant, and a good seating feel can be maintained.

[0021] According to the invention described in claim 7, since a grid section is formed in front of the seated position of the person sitting, where vertical ribs and horizontal ribs intersect in a grid pattern, it is possible to effectively suppress the curling up of the outer edge of the seating portion, which is the end side in the direction extending in both the vertical ribs and the horizontal ribs.

[0022] According to the invention described in claim 8, since the rib includes a cushioning portion made of a structure with lower rigidity than the lattice portion in the area including the seating position of the sitter, it is possible to provide the sitter with a more elastic and flexible feel and to provide a good seating feeling.

[0023] According to the invention described in claim 9, since the cushioning portion has an ischial tuberosity support portion, the sitee's ischial tuberosities can easily sink from the upper surface of the seating portion, and the surrounding area also flexes in a shape that conforms to the ischial tuberosities, which suppresses the concentration of load only on the lower end of the ischial tuberosities, the buttocks are supported with a soft feel, the burden on the sitee can be reduced, and a good sitting feeling can be provided to the sitee.

[0024] According to the invention described in claim 10, since the central vertical rib in the seat width direction is formed along the entire length of the seating portion in the front-to-back direction, the rigidity of the vertical rib can suppress sinking between the left and right ischial tuberosities, allowing the seating portion to flex in a shape that conforms to the ischial tuberosities, more effectively distributing the load on the lower end of the ischial tuberosities to the surroundings, and providing an even better seating feeling.

[0025] According to the invention described in claim 11, a rear mounting portion having a uniform width in the front-rear direction is provided at the rear end of the saddle seat, so that the impact on the seating feeling for the occupant is minimized, and the constant width in the front-rear direction makes it difficult for the seat to tilt due to load, and effectively suppresses the curling up of the outer edge of the seating portion. According to the invention described in claim 12, when the occupant's seating pressure is applied to the seating member, the vehicle body mounting portion can flex, thereby improving the cushioning of the seat.

[0026] This is a plan view of a saddle seat according to the first embodiment of the present invention. This is a left side view of the saddle seat according to the first embodiment. This is a front view of the saddle seat according to the first embodiment. This is a bottom view of the saddle seat according to the first embodiment. This is a cross-sectional view along the line W1-W1 in Figure 4. This is a cross-sectional view along the line W2-W2 in Figure 4. This is a cross-sectional view along the line W3-W3 in Figure 4. This is a cross-sectional view along the line W4-W4 in Figure 4. This is a cross-sectional view along the line L1-L1 in Figure 4. This is a cross-sectional view along the line L2-L2 in Figure 4. This is an explanatory diagram showing the positional relationship between the ischial tuberosities of a seated person and the saddle seat when the seated person is seated, and is shown as viewed from the left. This is an explanatory diagram showing the positional relationship between the ischial tuberosities of a seated person and the saddle seat when the seated person is seated, and is shown as viewed from the front. This is a perspective view of the ischial tuberosity support part formed in the cell structure. This is a perspective view showing the saddle seat inverted vertically. This is a perspective view showing the saddle seat inverted vertically and the support part of the vehicle frame that supports the saddle seat from below. This is a perspective view of the rear mount part viewed from diagonally below. This is a perspective view of the rear mounting section seen from diagonally above. This is a bottom view of the saddle seat with the shape of some of the vertical ribs changed. This is an upper perspective view showing the external configuration of the saddle seat according to the second embodiment of the present invention, (B) is a lower perspective view. This is a lower perspective view showing the external configuration of the saddle seat according to the second embodiment. This is a plan view showing the configuration of the saddle seat according to the second embodiment. This is a side view showing the configuration of the saddle seat according to the second embodiment. This is a front view showing the configuration of the saddle seat according to the second embodiment. This is a cross-sectional side view of the saddle seat along the line E-E in Figure 20A. This is a cut-off end view along the line A-A in Figure 20B. This is a cut-off end view along the line B-B in Figure 20B. This is a cut-off end view along the line C-C in Figure 22. This is a cut-off end view along the line D-D in Figure 22.

[0027] Embodiments of the present invention will be described below with reference to the drawings. The saddle seat shown in this embodiment will be described using a saddle seat for a motorcycle (so-called bike, motorbike, or motorbike) as an example, but it is not limited to this. The saddle seat can be any seat provided on a vehicle, on which a person straddles and sits. The vehicle can be a snowmobile, jet ski, bicycle, moped, construction vehicle, military vehicle, industrial vehicle, railway vehicle, or other vehicle such as a tiller or tractor. In the following description, the direction of travel of the vehicle will be referred to as forward, the direction opposite to the direction of travel as rear, the left side when facing forward as left, and the right side as right. In each drawing, the front is labeled F, the rear as B, the left as L, the right as R, the top as U, and the bottom as D. The left-right direction may also be referred to as the "seat width direction."

[0028] (First Embodiment) [Outline of the Saddle Seat] Figure 1 is a plan view of the saddle seat 10, Figure 2 is a left side view, Figure 3 is a front view, and Figure 4 is a bottom view. Figures 5 to 10 show cross-sectional views along the lines W1-W1, W2-W2, W3-W3, W4-W4, L1-L1, and L2-L2 in Figure 4, respectively. The saddle seat 10 has a seating portion 20 that is unfolded in a planar shape to cover the vehicle frame, a plurality of ribs 30 that hang down from the back surface (bottom surface) of the seating portion 20 toward the vehicle frame, mounting portions M1, M2 and a rear mounting portion 50 formed on the ribs 30 for setting the saddle seat 10 on the vehicle frame, and a front locking portion 60 and a rear locking portion 70 for locking the saddle seat 10 to the vehicle frame.

[0029] Furthermore, the saddle seat 10 is constructed as a molded product in which the entire structure, including all the above components, is integrally formed from a single material. For example, the seating portion 20 is required to have appropriate elasticity and be able to support the weight of the person sitting on it, and the ribs 30 are required to have rigidity to support the seating portion 20 and the vehicle frame so as not to buckle under the weight of the person sitting on it. In the saddle seat 10, the thickness, structure, etc. of each part of the seating portion 20 and the ribs 30 are adjusted to meet the above requirements, and for example, an elastomer resin, more specifically a thermoplastic elastomer, is used as the material. In this way, the saddle seat 10 is integrally molded from a single material, ensuring a high advantage from the standpoint of material recycling. Note that the thermoplastic elastomer is just one example, and other materials with equivalent properties may be used.

[0030] [Seating Area] The seating area 20 is unfolded in a planar shape to cover the mounting position of the saddle seat 10 on the vehicle frame. The planar shape here can be a flat surface, a curved surface, or a combination of multiple surfaces. The seating area 20 is a shell-like structure with a concave lower surface to correspond to the seating function of the saddle seat 10, and as shown in Figures 1 to 3, it has a seat surface 21 on which the sitter sits, side wall portions 22 hanging down (for example, diagonally downward) from the left and right side edges of the seat surface 21, and a rear wall portion 23 hanging down (for example, diagonally downward) from the rear edge of the seat surface 21.

[0031] The boundaries between the seat portion 21, the left and right side walls 22, and the rear wall portion 23 are connected by smooth curved surfaces to improve seating comfort. The seat portion 21, the left and right side walls 22, and the rear wall portion 23 are generally integrated structures of curved plate-like bodies of a certain thickness. The thickness does not necessarily have to be constant. With the above structure, the left, right, and rear outer edges of the seat portion 21, which are most susceptible to load, are reinforced by the side walls 22 and the rear wall portion 23, thus suppressing large deformations of the seat portion 21.

[0032] [Rib] The rib 30 is a plate-like structure that hangs down from the back surface of the seating portion 20 toward the vehicle frame. The rib 30 is formed over almost the entire back surface of the seating portion 20, except for the areas around the formation of the front locking portion 60 and the rear locking portion 70. The rib 30 has a grid portion 31 that forms a square grid when viewed from below, and a cell structure portion 35 that acts as a buffer, forming a partition wall-like structure that forms a hexagonal cell (small room) when viewed from below. In a plan view, the area where the cell structure portion 35 is formed is roughly the seating position of the person sitting on the saddle seat 10.

[0033] Here, as shown in Figure 4, the area where the ribs 30 are formed on the back surface of the seating portion 20 is conveniently divided into first region R1 to fourth region R4. The first region R1 is the front part of the back surface of the seating portion 20, and is an elongated area in the front-to-back direction located at the left end and the right end. The second region R2 is the rear part of the back surface of the seating portion 20, and is an elongated area in the front-to-back direction located at the left end and the right end. The third region R3 is the front part of the back surface of the seating portion 20, and is located in the center in the left-to-right direction, excluding the left and right first regions R1. The fourth region R4 is the rear part of the back surface of the seating portion 20, and is located in the center in the left-to-right direction, excluding the left and right second regions R2. Note that the rear ends of the left and right first regions R1 protrude somewhat further back than the rear ends of the third region R3 located between them.

[0034] [Grid section] The grid section 31 is formed in the first to third regions R1 to R3 on the back surface of the seating section 20, and the cell structure section 35 is formed in the fourth region R4.

[0035] The lattice section 31 has vertical ribs, which are hanging wall sections along the front-to-back direction, and horizontal ribs, which are hanging wall sections along the left-to-right direction (the width direction of the saddle seat 10). The multiple vertical ribs and multiple horizontal ribs constituting the lattice section 31 are all formed in a state where they are integrally connected at their respective intersecting positions.

[0036] The longitudinal ribs 321 in the left and right first regions R1 are generally aligned in the front-to-back direction, but the rear side is slightly inclined to the left or right with respect to the front-to-back direction, corresponding to the orientation of the left and right side walls 22 of the seating portion 20. The longitudinal ribs 322 and 323 in the left and right second regions R2 and third regions R3 are formed parallel to the front-to-back direction. However, the longitudinal rib 323A located at the center in the left-to-right direction in the third region R3 is an exception, being formed along the entire length from the front end to the rear end of the seating portion 20. In other words, only the longitudinal rib 323A is formed extending into the fourth region R4.

[0037] The transverse ribs 331 in the left and right first regions R1 and third regions R3 are formed across regions R1 and R3, spanning the entire width of the seat width direction (left-right direction) of the seating portion 20. In other words, the transverse ribs 331 are formed from the right surface of the left side wall portion 22 to the left surface of the right side wall portion 22. The transverse ribs 332 in the left and right second regions R2 are formed along the left-right direction within the range of each region R2.

[0038] The width of the grid formed by the longitudinal and transverse ribs in the second region R2 is smaller than that of the first region R1 and the third region R3, resulting in the formation of a denser grid.

[0039] [Cell Structure] As shown in Figure 4, the ribs 36 of the cell structure 35 densely divide the fourth region R4 with regular hexagons of equal size, and consist of hanging wall portions formed along the boundaries of each of these divisions. That is, the cell structure 35 is composed of a so-called honeycomb structure. Compared to the ribs of the first region R1 and the second region R2, the hanging height of the ribs 36 of the cell structure 35 is set lower toward the vehicle frame side, so as not to come into contact with the vehicle frame side. The width of the cells (divisions) of the ribs of the cell structure 35 is about the same as the width of the grid of the third region R3. The cell structure 35 constitutes a buffer section made of a honeycomb structure with lower rigidity in the vertical direction than each part of the grid section 31.

[0040] In the saddle seat 10, as shown in Figure 4, ischial tuberosity support portions 38 are formed on both the left and right sides of the central part of the cell structure portion 35, corresponding to the contact positions of the lower ends of the left and right ischial tuberosities I. Figures 11 and 12 are explanatory diagrams showing the positional relationship between the seated person's ischial tuberosities I and the saddle seat 10 when the seated person is seated. Figure 11 shows the view from the left, and Figure 12 shows the view from the front. Figure 13 is a perspective view of the ischial tuberosity support portion 38, with the portion of the ischial tuberosity support portion 38 shown in color. In Figures 11 and 12, the solid line represents the saddle seat 10, and the dashed line represents the saddle seat 10X in which the ischial tuberosity support portion 38 and vertical ribs 323A are not formed.

[0041] As shown in these figures, when a person sits on the saddle seat 10, the lower ends of the left and right ischial tuberosities I of the sitter are pressed against the rear half of the seating portion 20, at positions on both the left and right sides of the central part of the seating portion 20 in the left-right direction. As shown in Figures 7, 9, and 13, the ischial tuberosity support portion 38 consists of a recess in the cell structure portion 35 where the lower ends of each rib 36 are spherically recessed upwards. The ischial tuberosity support portion 38 is formed in which the hanging height of the ribs 36 from the lower surface of the seating portion 20 is reduced due to the upward recession of the lower ends of the ribs 36 in the cell structure portion 35. As the hanging height of the ribs 36 decreases, the rigidity decreases, so the center of the sphere of the ischial tuberosity support portion 38 has the lowest rigidity.

[0042] The seater's ischial tuberosities I are pressed against the center of the left and right ischial tuberosity support parts 38, making it easier for them to sink from the upper surface of the seating area 20. Because the rigidity of the surrounding area is also reduced by the structure of the ischial tuberosity support parts 38, the area flexes in a shape that conforms to the ischial tuberosities I, creating a state where it envelops and contacts the ischial tuberosities I. As a result, the load is not concentrated only on the lower end of the ischial tuberosities I, but is distributed to the surrounding area, so the buttocks are supported with a soft feel, and the burden when sitting is reduced. In the case of a saddle seat 10X that does not have ischial tuberosity support parts 38, when the lower end of the ischial tuberosities I is pressed against, the entire surrounding surface sinks downward, and the load is concentrated solely on the lower end of the ischial tuberosities I, causing a greater burden on the seater and a decrease in the seating feeling.

[0043] Further, as described above, a vertical rib 323A is provided penetrating the center of the cell structure 35 in the left-right direction in the front-rear direction. In the case of a saddle-riding seat 10X not provided with the vertical rib 323A, as shown in FIG. 12, the surface between the left and right ischia I tends to dent together with the tip portions of the ischia I, and load is concentrated only on the lower end portions of the ischia I, which increases the burden on the seated person and degrades the seating feeling. In contrast, when the vertical rib 323A is provided, the rigidity of the vertical rib 323A suppresses sinking between the left and right ischia I. As a result, the seat structure bends in a shape conforming to the ischia I and becomes close to a state of contacting so as to wrap the ischia I. Therefore, the load applied to the lower end portions of the ischia I is dispersed to the surroundings, which reduces the burden during seating and improves the seating feeling.

[0044] [First and Second Mounting Portions] The mounting portion refers to a portion that abuts against the vehicle body frame from above and supports the load of the saddle-riding seat 10 and the seated person. The saddle-riding seat 10 includes a first mounting portion M1, a second mounting portion M2, and a rear mounting portion 50 described later. The load of the saddle-riding seat 10 and the seated person is intensively applied mainly to these portions, which support the saddle-riding seat 10.

[0045] The first mounting portion M1 and the second mounting portion M2 are respectively formed on the ribs of the left and right first regions R1 and the ribs of the left and right second regions R2.

[0046] FIG. 14 is a perspective view showing the saddle-riding seat 10 in an upside-down state, and FIG. 15 shows the saddle-riding seat 10 in an upside-down state and a support portion of a vehicle body frame that supports the saddle-riding seat 10 from below. In FIG. 15, symbol H indicates the buttocks of the seated person.

[0047] As shown in FIGS. 3 to 6, 14 and 15, within the range of the left and right first regions R1, each lateral rib 331 is formed with a recess 331a consisting of a rectangular notch opening downward. In each lateral rib 331, the left-right width of the recess 331a is uniform. Further, each of the recesses 331a is arranged side by side on a straight line along the outer edge shape of the seating portion 20 on the outer side in the left-right direction of the first region R1, and constitutes a linear groove-shaped portion. This groove-shaped portion constitutes the first mounting portion M1.

[0048] Furthermore, vertical ribs 321 are formed in the first region R1 so as to be parallel to the groove-shaped portion formed by the respective recesses 331a. The vertical ribs 321 are formed within the formation range of the groove-shaped portion and adjacent to the groove-shaped portion in bottom view. Further, the vertical ribs 321 within the formation range of the groove-shaped portion are formed at a height that matches the height of the inner bottom of the recess 331a. The vertical ribs 321 formed adjacent to the groove-shaped portion are formed at a height that matches the height of a portion of the lateral rib 331 other than the recess 331a.

[0049] Two prismatic support members 101 are provided on the vehicle body frame so as to be parallel to the first mount portion M1 which is a groove-shaped portion. These two support members 101 can support the straddle-type seat 10 and a seated person from below in a state where they are fitted from below into the first mount portion M1 which is a groove-shaped portion. As described above, since the support members 101 can be fitted into and support the first mount portion M1 which is a groove-shaped portion from below the straddle-type seat 10, displacement of the straddle-type seat 10 in the left-right direction can be effectively suppressed when the motorcycle travels on a curve or when subjected to vibration or the like. Thereby, curling up of the side edge portions of the seating portion 20 can be suppressed. It should be noted that the structure fitted into the first mount portion M1 only needs to be a protruding strip, and is not limited to the prismatic support member 101.

[0050] A pair of front locking portions 60, which will be described later, are provided on the left and right of the front end portion of the seating portion 20, and a pair of rear locking portions 70, which will be described later, are provided on the left and right of the rear end portion of the seating portion 20. The left first mount portion M1 is arranged on a straight line along the front-rear direction connecting the left front locking portion 60 and the left rear locking portion 70. Further, the right first mount portion M1 is arranged on a straight line along the front-rear direction connecting the right front locking portion 60 and the right rear locking portion 70.

[0051] As shown in FIGS. 7, 8, 14 and 15, within the range of the rear portions of the left and right second regions R2, the lower ends of the respective vertical ribs 322 and the respective lateral ribs 332 are aligned so as to follow a uniform flat surface. As shown in FIG. 7, the front portion of the second region R2 is inclined in a direction different from that of the rear portion.

[0052] As a result, a planar second mounting portion M2 is formed at the bottom of the lattice portion 31 at the rear of the left and right second regions R2. Two flat support members 102 are provided on the vehicle frame in orientation corresponding to the planar second mounting portion M2. These two support members 102 can support the saddle seat 10 and the occupant from below by contacting the planar second mounting portion M2 from below. Note that the support members 102 do not need to be flat as long as they have a mounting surface. In this way, the support members 102 can contact and support the saddle seat 10 from below on the planar second mounting portion M2. Although the individual ribs 322 and 332 contact the support members 102 linearly, the second mounting portion M2 as a whole contacts the support members 102 planarly, distributing the load and suppressing buckling of each rib 322 and 332, thereby supporting the seat 20.

[0053] [Arch shape of transverse ribs] Multiple transverse ribs 331 formed across the left and right first region R1 and third region R3 are formed in an arch shape, where the end on the vehicle frame side (lower end) is shorter as it approaches the center in the left-right direction, in the range from one first mounting portion M1 to the other first mounting portion M1. The portion that has this arch shape is called the arch-shaped portion 37. By providing an arch-shaped portion 37 on each transverse rib 331 in this way, when a load is applied from above the flat seat surface 21, the arch shape converts it into a compressive force directed in the left-right direction, thereby increasing rigidity. The lower surface of the arch-shaped portion 37 does not directly contact the vehicle frame, while still being able to withstand and support the load from the occupant.

[0054] [Rear Mount Section] Figure 16 is a perspective view of the rear mount section 50 seen from diagonally below, and Figure 17 is a perspective view seen from diagonally above. As shown in Figures 4 and 14 to 16, the rear mount section 50 is provided in a state where it protrudes downward from the surrounding area at the center in the left-right direction of the lower rear end of the saddle seat 10. The rear mount section 50 is provided at an intermediate position in the left-right direction between a pair of rear locking sections 70 provided on the left and right sides of the rear end of the seating section 20.

[0055] The rear mounting portion 50 has a roughly rectangular, plate-like shape when viewed from below. The bottom of the rear mounting portion 50 is placed on a rectangular mounting base 103, which is approximately the same size as or slightly larger than the rear mounting portion 50, and is provided on the vehicle frame shown in Figure 15. The mounting base 103 does not have to be a platform structure, as long as it has a mounting surface. The rear mounting portion 50 has a certain width in the front-rear and left-right directions. For example, if the front-rear width of the rear mounting portion 50 is approximately 10-25% of the front-rear length of the left-right center of the saddle seat 10, and the left-right width of the rear mounting portion 50 is approximately 10-25% of the left-right width of the rear of the saddle seat 10, the saddle seat 10 can be stably installed on the vehicle frame.

[0056] The rear mount portion 50 is closed at the top, and vertical and horizontal ribs are formed in a grid pattern at the bottom. However, these ribs not only ensure rigidity but also serve the purpose of reducing material weight to suppress deformation during molding. The rear half of the rear mount portion 50 protrudes further back than the rear end of the seat portion 20. This is to reduce the amount of protrusion toward the cell structure portion 35 while ensuring the appropriate front-to-back width of the rear mount portion 50. If the amount of protrusion toward the cell structure portion 35 increases, it will interfere with the sinking of the cell structure portion 35 when seated, worsening the seating sensation for the person seated. In addition, multiple reinforcing ribs 51 are erected along the front-to-back direction on the upper surface of the rear half portion of the rear mount portion 50 that protrudes from the seat portion 20. This suppresses upward bending of the protruding rear half portion of the rear mount portion 50.

[0057] [Front Locking Parts] As shown in Figures 4, 9, and 10, a pair of front locking parts 60 are provided on the lower surfaces of the left and right front ends of the seating part 20. The front locking parts 60 are roughly L-shaped arm members that hang down from the lower surface of the seating part 20, bend forward midway, and have their tips extending forward. The front locking parts 60 extend forward to a length such that their tips hardly protrude from the front end of the seating part 20 in a plan view.

[0058] The front locking portions 60 on both the left and right sides have their forward-extending tips inserted into insertion points provided on the vehicle frame, thereby holding the front of the saddle seat 10 in place to prevent it from moving upward. The front locking portions 60 also employ a weight-reducing structure in which three vertical plates, arranged with gaps between them in the left-right direction, are integrally joined.

[0059] [Rear Locking Part] As shown in Figures 4, 14, and 17, a pair of rear locking parts 70 are provided on the lower surfaces of the left and right rear ends of the seating part 20. The rear locking part 70 is a roughly L-shaped arm member that hangs down from the lower surface of the seating part 20, bends to the rear midway, and has its tip extending to the rear. The tip of the rear locking part 70 extends in a state where it protrudes to the rear from the rear end of the seating part 20 in a plan view.

[0060] Both the left and right rear locking portions 70 have through holes formed near their tips that extend vertically through them. With the tips of the left and right front locking portions 60 inserted into the insertion parts of the vehicle frame, bolts are passed through the through holes of the left and right rear locking portions 70 and fastened to the vehicle frame. The rear locking portions 70 are restrained by the bolts so as not to move upward and in the front-rear direction relative to the vehicle frame, and the front locking portions 60 are also prevented from being pulled out of the insertion parts, so that the saddle seat 10 can be fixedly held to the vehicle frame. The rear locking portions 70 have a hollow, weight-reducing structure consisting of a bottom plate portion and an outer wall portion that rises along its outer edge.

[0061] The saddle seat 10 described above has mounting parts M1 and M2 formed on ribs 30 provided on the back surface of the seating area 20 for attaching the saddle seat 10 to the vehicle frame. The saddle seat 10 with the above configuration is attached to the vehicle frame by the mounting parts M1 and M2, the rider sits on the seating area 20, and the ribs 30 provide elasticity and flexibility to the rider, thus fulfilling all the functions of a saddle seat. Furthermore, since the ribs 30 are provided on the seating area 20 and the mounting parts M1 and M2 are formed on the ribs 30, it is easy to integrally form these from a single material. Therefore, it is possible to reduce the number of parts and improve recyclability. In addition, the presence of ribs 30 provides rigidity to the seating area 20, the ribs 30 can support the load of the seating area 20, and the ribs 30 can provide the rider with a good feeling when sitting, such as flexibility and elasticity. Furthermore, since mounting portions M1 and M2 are provided on the rib 30, deformation of the seating portion can be suppressed when a load is applied, and curling up of the outer edge can be prevented.

[0062] Furthermore, the saddle seat 10 has a first mounting portion M1 which is made up of a groove-shaped portion consisting of recesses 331a formed in a plurality of transverse ribs 331. In this configuration, the transverse ribs 331 also serve as the first mounting portion M1, so there is no need to form a separate mounting portion, and weight reduction can be achieved. In addition, when the load of a person sitting on the seat 20 is applied to the center of the seat 10, the outer circumference of the seat 20 tends to deform and curl up. However, because the opposing structure on the vehicle frame side fits into this groove-shaped portion, even when a load is applied to the center of the seat 20, the groove-shaped portion can maintain a constant position due to the fitting, thus suppressing the curling up of the outer circumference.

[0063] Furthermore, the first mounting portion M1 has longitudinal ribs 321 formed along the groove-shaped portion, both at the groove-shaped portion's formation location and adjacent to it. As a result, the multiple transverse ribs 331 with recesses 331a are firmly held in the direction along the longitudinal ribs 321, increasing the rigidity around the groove-shaped portion and suppressing deformation. This makes it possible to more effectively suppress the curling up of the outer circumference of the seating portion 20.

[0064] Furthermore, since the ribs of the saddle seat 10 include transverse ribs 331 that extend from one side wall portion 22 to the other side wall portion 22 in the seat width direction of the seating portion 20, these transverse ribs 331 hold the left and right side walls 22, making it possible to more effectively suppress the occurrence of curling up.

[0065] Furthermore, the saddle seat 10 has an arch-shaped portion 37 formed at the end of the transverse rib 331 on the vehicle frame side, which is provided extending from one first mounting portion M1 to the other first mounting portion M1. By providing this arch-shaped portion 37, when a load is applied from above the seat surface 21, the effect of the arch shape converts it into a compressive force directed in the left-right direction, thereby increasing rigidity. This allows the seat to withstand and support the load from the occupant while maintaining a state where the lower surface of the arch-shaped portion 37 does not directly contact the vehicle frame. In other words, if the lower surface of the arch-shaped portion 37 does not contact the vehicle frame, the hardness of the vehicle frame is not transmitted to the occupant, thus maintaining an elastic and flexible feel and enabling a good seating feeling.

[0066] Furthermore, in the saddle seat 10, the vertical ribs 321, 323 and the horizontal ribs 331 intersect in a grid pattern to form a grid section 31 in front of the seated position of the person sitting. This effectively suppresses the curling up of the outer edge of the seating section 20, which is at the end of the direction in which both the vertical ribs 321, 323 and the horizontal ribs 331 extend.

[0067] Furthermore, the saddle seat 10 has a cell structure 35 as a cushioning part, which is formed in an area including the seating position of the sitter and has a structure with lower rigidity than the lattice part 31. This makes it possible to give the sitter a more elastic and flexible feel and provide a good seating feeling.

[0068] Furthermore, the saddle seat 10 has a cell structure 35 acting as a cushioning section, which has an ischial tuberosity support section 38 at a position corresponding to the sitter's ischial tuberosities, where the rib hanging height is lower than the surrounding area. As a result, the sitter's ischial tuberosities I can easily sink from the upper surface of the seating section 20, and the surrounding area also flexes in a shape that conforms to the ischial tuberosities I, suppressing the concentration of load only on the lower end of the ischial tuberosities I. The buttocks are supported with a soft feel, the burden during sitting is reduced, and a good sitting feeling can be provided to the sitter.

[0069] Furthermore, the saddle seat 10 has a longitudinal rib 323A in the center of the seat width direction that extends along the entire length of the seating area 20 in the front-to-back direction. As a result, the rigidity of the longitudinal rib 323A suppresses sinking between the left and right ischial tuberosities I. Consequently, the seating area 20 can be further flexed to conform to the shape of the ischial tuberosities I, more effectively distributing the load on the lower end of the ischial tuberosities to the surrounding area and providing an even better seating feel.

[0070] Furthermore, the saddle seat 10 is provided with a rear mount portion 50 at its rear end that protrudes downward from the surrounding area and has a single width in the front-to-back direction. Since the rear mount portion 50 is located at the rear end of the saddle seat 10, it has little impact on the seating feeling of the person seated on the seating portion 20. Moreover, having a single width in the front-to-back direction makes it less likely for the seat to tilt due to the load, and effectively suppresses the curling of the outer edge of the seating portion 20.

[0071] The first embodiment of the present invention has been described above. However, the present invention is not limited to the above-described first embodiment. For example, in the first embodiment, a component integrally formed from a single member may be replaced with a component divided into multiple members that are connected or fixed to each other. Also, a component formed by connecting multiple members may be replaced with a component integrally formed from a single member.

[0072] For example, the bottom view shape of each rib exemplified in the saddle seat 10 is just one example and can be changed. For example, the vertical and horizontal ribs of the grid section 31 may be curved. Also, the cells of the cell structure section 35, which serves as a buffer, are not limited to regular hexagons but may be other regular polygons, combinations of multiple types of regular polygons, star-shaped regular polygons, etc. Furthermore, the cells may be polygons other than regular polygons.

[0073] Figure 18 shows a bottom view of a saddle seat 10B in which the shape of some of the vertical ribs has been modified as an example. In this saddle seat 10B, the vertical ribs 321B within the first region R1 of the lattice portion 31B of the rib 30B are curved to follow the outer edge shape of the seat portion 20 on the left and right outer side of the first mount portion M1. With such vertical ribs 321B, the outer edge of the seat portion 20 is more likely to maintain its original shape, and curling up and irregular deformation due to the load when seated can be further suppressed.

[0074] (Second Embodiment) As shown in Figures 19 and 20, the saddle seat 10 of the second embodiment consists of a saddle-shaped seating portion 11 and a vehicle mounting portion 12 provided on the lower side of the seating portion 11 for attaching the seating portion 11 to a vehicle frame (not shown). Furthermore, the saddle seat 10 of the second embodiment is constructed as a molded product in which the seating portion 11 and the vehicle mounting portion 12 are integrally formed from a single material, and the seating portion 11 is formed with a thickness set to have appropriate elasticity and strength to support the weight of the occupant (seater). As a material for such a saddle seat 10, for example, an elastomer resin or a material having equivalent properties can be considered. Since the saddle seat 10 is formed from an elastomer material, there is no need to use urethane material, so it can meet the requirements from the viewpoint of material recycling.

[0075] Figure 19 shows the external appearance of the saddle seat 10 of the second embodiment, with Figure 19A being a perspective view of the top side of the saddle seat 10 and Figure 19B being a perspective view of the bottom side of the saddle seat 10. Also, Figure 20A is a plan view of the saddle seat 10 and Figure 20B is a side view of the saddle seat 10. Furthermore, Figure 21 shows a front view of the saddle seat 10 as seen from the front.

[0076] As shown in Figure 19A, the seating portion 11 of the saddle seat 10 in the second embodiment has a seating surface portion 11A and side portions 11B that hang downward from both ends of the seating surface portion 11A. The boundary between the seating surface portion 11A and the side portions 11B on both sides is formed in a curved shape to improve seating comfort, and a groove 11C is formed along the curved portion that is continuous in the front-to-back direction. Furthermore, as shown in Figures 19B and 23B, on the back side of the seating portion 11, a convex ridge portion 11D that bulges downward is formed in the area corresponding to the groove 11C, and is continuous in the front-to-back direction, similar to the curved portion.

[0077] As described above, by providing grooves 11C at the boundary between the seating surface 11A and the side portions 11B on both sides, the seating surface 11A can bend downwards more easily when an occupant sits on the seating surface 11, thereby improving the cushioning of the seat. Furthermore, by providing raised ridges 11D on the back surface of the seating surface 11A corresponding to the grooves 11C on the front side, the seating surface 11A can be made to bend downwards more easily while suppressing the decrease in strength that occurs with the formation of the grooves 11C. In addition, the presence of grooves 11C can improve the design of the seat. To further enhance the design, a line-like pattern of a different color from the surface color of the seating surface 11 may be applied along the grooves 11C.

[0078] In the second embodiment, the vehicle body mounting portions 12 of the saddle seat 10 are provided in four locations: one pair on the front side (reference numeral 12A) and one pair on the rear side (reference numeral 12B), as shown in Figures 19A and 19B. Furthermore, although not particularly limited, the rear vehicle body mounting portions 12B are set to be at a higher position than the front vehicle body mounting portions 12A, depending on the shape of the vehicle body frame to which it is attached and the mounting position. In addition, as shown in Figure 19B, the vehicle body mounting portions 12A and 12B are provided on the lower surface of the side portion 11B and the lower surface of the seating surface portion 11A, respectively.

[0079] Furthermore, the four vehicle body mounting portions 12A and 12B are positioned so as not to overlap with the groove 11C in the vertical direction. In other words, the groove 11C is positioned so as not to overlap with the vehicle body mounting portions 12A and 12B. This prevents a decrease in the strength of the seat caused by the vehicle body mounting portions 12A and 12B overlapping the groove 11C, which has relatively low strength, within the seating portion 11. Moreover, in the second embodiment, the vehicle body mounting portions 12A and 12B are positioned at approximately equidistant front-to-back distances from the center position of the seating portion 11 where the weight of the occupant is applied. Therefore, the vehicle body mounting portions 12A and 12B can be designed to have the same strength and the same size, thereby reducing the design burden compared to when they are of different sizes.

[0080] Next, the configuration of the vehicle body mounting portion 12 will be explained using Figures 21 to 24. Of these, Figure 21 is a front view of the saddle seat 10 of the second embodiment as seen from the front, and Figure 22 is a cross-sectional view along the line E-E in Figure 20A. Also, Figure 23A is a cut-out end view along the line A-A in Figure 19B, Figure 23B is a cut-out end view along the line B-B in Figure 19B, Figure 24A is an end view along the line C-C in Figure 22, and Figure 24B is an end view along the line D-D in Figure 22.

[0081] As shown in Figures 21 and 22, each vehicle body mounting portion 12 consists of a base portion 121 provided on the lower surface of the side portion 11B or the seating surface portion 11A, and a connecting portion 122 formed to protrude downward from the base portion 121 and to connect to the vehicle body frame. The base portion 121 and the connecting portion 122 are integrally formed. In the second embodiment, the portion of the vehicle body mounting portion 12 that is higher than the lower end of the side portion 11B is referred to as the base portion 121, and the portion of the vehicle body mounting portion 12 that is lower than the lower end of the side portion 11B is referred to as the connecting portion 122. The presence of the base portion 121 improves the shape stability of the vehicle body mounting portion 12 relative to the seating portion 11.

[0082] Furthermore, along the lower edge of the side portion 11B of the vehicle body mounting portion 12, ribs 123a and 123b are formed on the inner surface of the vehicle body mounting portions 12A and 12B in a direction that is horizontal or at a predetermined angle to the horizontal. The portion above these ribs 123a and 123b can be considered as the base portion 121, and the portion below the ribs 123a and 123b can be considered as the connecting portion 122. As shown in Figures 22, 23, and 24, the connecting portion 122 is provided with a through hole 122d through which a fixing bolt is inserted. In addition, a fixing portion with a similar through hole is provided on the vehicle body frame side (not shown). The saddle seat 10 is connected to and fixed to the vehicle body frame via the connecting portion 122 by aligning the through hole 122d of the connecting portion 122 with the through hole of the fixing portion, inserting a bolt, and screwing on a nut.

[0083] Furthermore, as shown in Figures 23A and 24A, the base portion 121 is provided with a recess 121a that is recessed inward in the vehicle width direction, and as shown in Figures 22 and 24B, a rib (second rib) 121b extending in the extending direction (approximately vertical direction) of the vehicle body mounting portion 12 is provided within this recess 121a. The presence of the recess 121a and the rib 121b makes it possible to reduce the weight of the base portion 121 while maintaining its strength. On the other hand, as shown in Figures 23A and 24B, the connecting portion 122 is provided with a curved portion 122a that curves inward from the upper end in the vehicle width direction, and as shown in Figure 20B, a rib (first rib) 122b extending in the extending direction of the vehicle body mounting portion 12 is provided on the outer surface of this curved portion 122a.

[0084] Furthermore, as shown in Figures 22 and 24A, a rib (third rib) 122c extending in the extending direction of the vehicle body mounting portion 12 is provided on the inside of the curved portion 122a of the vehicle body mounting portion 12. In this way, the presence of the curved portion 122a makes the vehicle body mounting portion 12 more flexible. Therefore, the curved portion 122a becomes an elastically deformable part of the vehicle body mounting portion 12, and the elastic deformation of the curved portion 122a can improve the cushioning of the seat. In addition, the presence of the rib 122c on the inside of the curved portion 122a prevents the vehicle body mounting portion 12 from bending too much. Moreover, as shown in Figure 22, the rib 122c on the inside of the curved portion 122a of the connecting portion 122 is provided in a position that does not overlap vertically with the rib 121b of the base portion 121. This improves the overall shape stability of the vehicle body mounting portion 12.

[0085] As described above, the saddle seat 10 of the second embodiment includes a seating member 11 that supports the seated position of the occupant. The seating member 11 has a seating surface portion 11A at the top and a vehicle mounting portion 12 at the bottom that connects to the vehicle frame. Therefore, the entire seat can be constructed from a single component, reducing the number of parts and improving recyclability. Furthermore, because it has a vehicle mounting portion 12, the seat can be easily attached and secured to the vehicle frame.

[0086] Although the present invention has been described above based on the second embodiment, the present invention is not limited to the above second embodiment and can be modified as appropriate without departing from the spirit thereof. For example, in the above second embodiment, the front body mounting portion 12A and the rear body mounting portion 12B are provided at positions approximately equidistant from the center of gravity where the weight of the occupant of the seating portion 11 is applied, and the body mounting portions 12A and 12B are set to the same size. However, the body mounting portions 12A and 12B may be provided at positions at different distances from the center of gravity where the weight of the occupant is applied, in which case it is preferable to set the size of the body mounting portion provided closer to the center of gravity to be larger than the size of the body mounting portion provided further from the center of gravity.

[0087] As can be seen from the above description, the above embodiment includes an invention of a saddle seat for a vehicle equipped with a seating member that supports the seated state of the occupant, wherein the seating member has a seating surface portion at the top and a vehicle mounting portion at the bottom that connects to the vehicle frame. With a saddle seat having such a configuration, the entire seat can be made from a single component, making it easier to reduce the number of parts and improve recyclability. In addition, because it has a vehicle mounting portion, it is easy to attach and fix the seat to the vehicle frame.

[0088] Here, it is preferable that the vehicle body mounting portion be configured to be elastically deformable. With a saddle seat having such a configuration, the vehicle body mounting portion can flex when the seating pressure of the occupant is applied to the seating member, thereby improving the cushioning of the seat.

[0089] Furthermore, the vehicle body mounting portion should have a curved portion that curves inward in the vehicle width direction. With a saddle seat having such a configuration, the vehicle body mounting portion becomes more flexible due to the presence of the curved portion, improving the cushioning of the seat.

[0090] Furthermore, it is preferable that a first rib extending in the extending direction of the vehicle body mounting portion is formed on the outer surface of the curved portion in the vehicle width direction. With a saddle seat having such a configuration, it becomes easier to suppress excessive bending of the vehicle body mounting portion by the rib (first rib 122b).

[0091] Furthermore, it is preferable that a recess is formed on the inner surface of the curved portion in the vehicle width direction, recessing outward in the vehicle width direction, and a second rib is formed within the recess. With a saddle seat having such a configuration, it becomes easier to suppress excessive bending of the vehicle body mounting portion by the rib (second rib 121b).

[0092] Furthermore, a base portion is provided on the lower surface of the seating member, and the vehicle body mounting portion is formed on the base portion from top to bottom. With a saddle seat having such a configuration, the presence of the base portion makes it easier to improve the shape stability of the vehicle body mounting portion relative to the seating member.

[0093] Furthermore, it is preferable that the base portion has a recess that is recessed outward in the vehicle width direction, and that a third rib extending in the direction of the vehicle body mounting portion is formed in the recess. With a saddle seat having such a configuration, the presence of the rib (third rib 122c) makes it easier to prevent the vehicle body mounting portion from bending too much.

[0094] Furthermore, it is preferable that the second rib and the third rib are positioned so that they do not overlap in the vertical direction. With a saddle seat having such a configuration, it becomes easier to avoid a reduction in the strength of the seat caused by the vehicle body mounting portion overlapping with a groove in the seating area that has relatively low strength.

[0095] Furthermore, the seating member has a seating surface and side portions extending downward from both sides of the seating surface, and it is preferable that grooves extending along the boundary are provided on the surface of the boundary between the seating surface and the side portions. With a saddle seat having such a configuration, the provision of grooves makes the seating surface more flexible when seated, improving the cushioning of the seat.

[0096] Furthermore, it is preferable that the groove portion be positioned so as not to overlap with the vehicle body mounting portion in the vertical direction. With a saddle seat having such a configuration, it is possible to avoid positioning the vehicle body mounting portion in a relatively weak area, thereby improving the durability of the seat. It can also be used for tillers, tractors, and the like.

[0097] 10, 10B, 10X Saddle seat 20 Seating area 21 Seat surface 22 Side wall + Rear wall 30, 30B Ribs 31, 31B Lattice section 321-323 Vertical ribs 321B Vertical ribs 323A Vertical ribs 331, 332 Horizontal ribs 331a Recess 35 Cell structure (cushioning section) 36 Ribs 37 Arch-shaped section 38 Ischial support section 50 Rear mount section 51 Reinforcement ribs 60 Front locking section 70 Rear locking section 101 Support material 102 Support material 103 Mounting base H Buttocks I Ischial M1 First mount section M2 Second mount section R1 First area R2 Second area R3 Third area R4 Fourth area 11 Seating area 11 11A Seat surface 11B Side part 11C Groove 11D Protruding part 12, 12A, 12B Body mounting part 121 Base part 121a Recess 121b Rib (second rib) 122 Joint part 122a Curved part 122b Rib (first rib) 122c Rib (third rib) 122d Through hole 123a, 123b Rib

Claims

1. A saddle seat for a vehicle, comprising a seating member that supports the seated position of an occupant, wherein the seating member has a seating surface at its upper end and a vehicle mounting portion at its lower end that connects to the vehicle frame.

2. A saddle seat for a person to straddle and sit on, comprising: a seating portion unfolded in a planar shape that covers the frame of a vehicle; a plurality of ribs hanging down from the back surface of the seating portion toward the frame; and mounting portions formed on the ribs for attaching the saddle seat to the frame, as described in claim 1.

3. The saddle seat according to claim 2, characterized in that the mounting portion is a groove-shaped portion consisting of recesses formed in a plurality of ribs.

4. The saddle seat according to claim 3, characterized in that, in addition to the rib in which the recess is formed, a rib along the groove-shaped portion is formed at the location where the groove-shaped portion is formed or adjacent to the groove-shaped portion.

5. The saddle seat according to claim 3, characterized in that the ribs include transverse ribs provided from one side wall portion to the other side wall portion in the seat width direction of the seating portion.

6. The saddle seat according to claim 5, wherein the mounting portion includes first mounting portions provided on one side and the other side in the seat width direction, in front of the seated position of the sitter, and the frame-side end of the transverse rib provided from one first mounting portion to the other first mounting portion in the seat width direction is arch-shaped, with the hanging length decreasing towards the center in the seat width direction.

7. The saddle seat according to claim 5, characterized in that the ribs include a plurality of longitudinal ribs provided along the front-rear direction of the seat, and the longitudinal ribs and transverse ribs intersect in a grid pattern in front of the seated position of the occupant to form a grid section.

8. The saddle seat according to claim 7, characterized in that the ribs are formed in a range including the seating position of the sitter and include a cushioning portion having a structure with lower rigidity than the lattice portion.

9. The saddle seat according to claim 8, characterized in that the cushioning portion has an ischial tuberosity support portion at a position corresponding to the ischial tuberosities of the sitter, where the hanging height of the ribs is lower than that of the surrounding area.

10. The saddle seat according to claim 9, characterized in that the longitudinal rib in the center of the seat width direction is formed over the entire length of the seating portion in the front-rear direction.

11. The saddle seat according to claim 2, characterized in that a rear mounting portion is provided at the rear end of the saddle seat, protruding downward from the surrounding area, and the rear mounting portion has a certain width in the front-rear direction.

12. The saddle seat according to claim 1, characterized in that the vehicle body mounting portion is configured to be elastically deformable.

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