Model function is not passing query results to view

Hello everyone!

I'm new in this community and with Laravel.

I'm going to create an application that retrieve a lot of numeric data from a database to then manipulate it and make some math operations. I'm facing some troubles with a function and it's not passing query results to the view. Here is my code:

MODEL

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Support\Facades\DB;

class Quote extends Model
{
    use HasFactory;

    public function searchKey($key)
    {
        $unidad = DB::table('vehiculos')
            ->select(DB::raw('id, llave, marca'))
            ->where('llave', $key)
            ->get();

        return $unidad;
    }
}

CONTROLLER

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use App\Models\Quote;

class QuoteController extends Controller
{
    public function index()
    {
        return view('index');
    }

    public function sendForm(Request $request)
    {
        $request->validate([
            'llave' => 'required'
        ]);

        $quote = new Quote();
        $quote->searchKey($request->llave);

        return view('index', [
            'cotizaciones' => $quote
        ]);
    }
}

VIEW

@foreach ($cotizaciones as $cotizacion)
    {{ $cotizacion }}
@endforeach

If I test the model variable dd($unidad), it shows the query results as an array inside a collection, but when I test dd($cotizacion) from the view, then I get a collection with lots of data, but not the query results. What am I doing wrong?